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Code for Design on Steel Structure of Railway Bridge
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Code for Design on Steel Structure of Railway Bridge
UDC
Industry Standard of the People 's Republic of China
Code for steel structure design of railway bridge
2017-01-02 release
2017-05-01 Implementation
Issued by the State Railway Administration
People 's Republic of China Industry Standard
Code for steel structure design of railway bridge
Organizer. China Railway Bridge Survey and Design Institute Group Co., Ltd
Approved by. National Railway Administration
Date of implementation. May 1,.2017
Preface
"Railway Bridge Steel Design Code" TB 10002.2-2005 since the release of China's railway, especially high-speed railway
Construction has made remarkable achievements, the Beijing-Shanghai, Beijing-Guangzhou, Zhengzhou West, Kazakhstan and other high-speed railway, Yi Wan, too Bank of China
Passenger and freight line railway, Shanxi and southern channel, Mongolian and other heavy railways, the Pearl River Delta and Wuhan city circle intercity railway
A large number of railway projects have been completed and opened to traffic, improve the road network structure, an increase of the effective supply of rail transport services. through
Over ten years of active exploration and innovation practice, China's railway bridge construction technology has made a major breakthrough, has been among the world
Advanced ranks. Nanjing Dashengguan Yangtze River Bridge, Wuhan Tianxingzhou Yangtze River Bridge and a number of deep water, large span, special geological
Conditions, the complex structure of the successful construction of the bridge, independent research and development of large tonnage box girder complete sets of technology widely used,
In order to further improve the railway bridge technical standards have accumulated rich experience, laid a solid foundation.
This specification is based on the requirements of the National Railway Administration to build a railway engineering construction standard system, in order to meet the railway bridge construction
Facilities and development needs, unified railway bridge steel design standards, improve the railway bridge steel design level, protection
Railway bridge steel structure safety and quality, on the basis of the original norms, summed up in recent years, China's high-speed, inter-city, passenger and cargo
Collinear and heavy-duty railway bridge steel construction, operation of the practical experience and scientific research, a comprehensive revision.
This specification implements the principles of safety priorities, strengthens quality and safety, conserves resources and protects the environment.
Requirements, focus on the overall design, combined with China's national conditions, socio-economic development level, environmental conditions and other factors, reasonable
To determine the different transport properties of different types of different levels of railway bridge steel structure of the main design standards, to further mention
Rose the norms of scientific and technical economic rationality. In recent years, China's railway steel bridge design field emerged a large number of new
Materials, new structures, new processes, including the use of new materials for Q500q steel, all welded joints and integral steel bridge panels
With the construction of kilometer railway cable-stayed bridge and suspension bridge, the norms in the summary, to absorb the advanced achievements and mature
Experience based on the revised.
This specification consists of 10 chapters, including general principles, terms and symbols, materials and basic allowable stresses, structural forces
Calculate the length of the bar, slenderness ratio and component cross-section, component connection, deck system and joint system, steel beam, steel
Truss beams, bearings, etc., and another three appendix.
The main technical contents of this revision are as follows.
1. Revised the scope of application of the specification, applicable to high-speed railway, inter-city railway, passenger and freight line Ⅰ and Ⅱ railway,
Structural Design of Heavy Haul Railway Bridge.
2. Increase the relevant provisions of Q500q steel.
3. With the national standard "structural steel for bridge" revision, revised steel structure of the steel structure of the relevant provisions.
4. Revised the design requirements for the impact toughness of welded joints (including weld metal and heat affected zones).
5. Increases the fatigue resistance of the 17 structural details; the supplement provides for both axial and bending stresses
Calculation of stress amplitude of rods.
6. The two-line coefficient to expand the formation of multi-line coefficient; added high-speed railway, intercity railway fatigue damage correction system
The ratio of the stress ratio to the correction coefficient table increases the ratio of the stress ratio.
7. Added the relevant provisions for the stability of the box bar with stiffener.
8. The relevant provisions for the effective width of the flange of the bridge deck of the steel truss girder are added.
9. Added the relevant requirements for the effect of the discontinuity of the temperature change on the structure of the truss composite structure.
In the implementation of the norms of the process, I hope the units combined with engineering practice, conscientiously sum up experience, the accumulation of information. Such as
Found to need to modify and add the place, please send the views and relevant information to the China Railway Bridge Survey and Design Institute Limited
(Wuhan City Economic and Technological Development Zone Bo Xue Road on the 8th, Zip code. 430056), and copy the China Railway Economic Regulation
(Beijing Haidian District, North honeycomb Road No. 29, zip code. 100038), for future revision reference.
This specification is interpreted by the Ministry of Science, Technology and Law of the State Railway Administration.
Organizer. China Railway Bridge Survey and Design Institute Limited
Participated by. China Railway Science Research Institute
China Railway Engineering Design Consulting Group Co., Ltd
Main drafters. Xu Wei, Zhang Yuling, Xu Shengqiao, Liu Hanshun, Du Ping, Gao Jingqing, Gao Xing, Wang Zhiping,
TANG He-qiang, XIE Xin, ZHANG Cheng-dong, XU Ke-ying, CUI Xin, WANG Li, TAO Xiao-yan, JIN Ling, ZHAO Bubo.
Main reviewers. Wang Zhaohu, Wu Shaohai, Chen Liangjiang, Yang Mengjiao, Liu Yan, Xue Jiagang, Yin Ningjun, Liu Chun,
ZHAO Hui-dong, YANG Peng-jian, YANG Yan-hai, CHEN Ke-jian, YAN Yong, WANG Xin-guo, QU Guo-zhao, GUI 婞, MAO Wei-qi, TU Man-ming, HU Guang-rui
Directory
1 General .1
2 terms and symbols
2.1 Terminology
2.2 symbols .3
3 material and basic allowable stress
3.1 Basic materials .5
3.2 Basic allowable stress
4 internal force calculation
4.1 Principles of structural internal forces calculation
4.2 Strength and stability calculation
4.3 Fatigue calculation .24
The calculated length, slenderness, and cross section of the bar
5.1 Calculate the length of the bar
5.2 allowable maximum slenderness of the bar
5.3 Section of the component
6 component connection
6.1 Mechanical connection
6.2 Weld connection
7 deck system and connection system
7.1 deck system
7.2 Settings of the connection system
8 steel beam
9 steel truss beam
10 seats .51
Appendix A main technical indicators for railway bridge steel
Appendix B Calculation of the bending moment of the beam in the plane of the beam with the vertical load.
Appendix C Calculation of internal forces caused by the deformation of the longitudinal and transverse beams of single-wire simply supported steel truss beams.56
Appendix D Requirements for Ultrasonic Flaw Detection of Welded Joints
Appendix E Weld appearance quality requirements
Instructions for this specification
Specification for Steel Structure Design for Railway Bridges
1 General
1.0.1 To implement the relevant national laws and regulations and railway technology policy, unified railway bridge steel design technical standards, so that
Railway bridge steel structure design in line with safe and reliable, advanced mature, affordable, environmental protection requirements, the development of this specification.
1.0.2 This specification applies to high-speed railway, inter-city railway, passenger and freight line Ⅰ and Ⅱ railway, heavy rail riveting,
Design of Steel Structure for Welding and Full Welding of Bridge. The steel structure of the public and iron bridge alone shall bear the load of the road
Of the highway industry-related standards for design.
1.0.3 railway bridge steel structure should have the required strength, stiffness, stability and durability, the main structure of the design
The age should be 100 years.
1.0.4 The design of this specification, should still meet the current "Railway Bridge Design Code" (TB 10002) requirements.
1.0.5 steel structure of the components should be standardized, so that the same type of components can be interchangeable. The structure should be easy to process, transport, and safety
Equipment, inspection and maintenance.
1.0.6 Bridge cross-structure should be set to pre-camber, pre-camber curve and the dead and semi-static live load generated by the deflection curve shape
Basically the same, but in the opposite direction. The vertical deflection caused by dead load and static load is not more than 1/1600 of the span of the bridge
, The pre-camber is not set.
1.0.7 Bridge cross structure The transverse overturning stability factor should not be less than 1.3 under the most unfavorable combination of calculated loads.
1.0.8 steel beam should be able to adapt to jack jack up. The top facilities and the structure itself shall be calculated at a height of 1.3 times from the top load.
1.0.9 Offset bridges on the center of the curve and other bridges with eccentric loads should calculate the effect of the partial load on the bridge cross structure.
1.0.10 Railway bridge steel structure design should comply with this specification, should still meet the relevant provisions of the current national standards.
2 terms and symbols
2.1 terminology
Simple support beam
One end for the longitudinal movement of the bearing, one end of the longitudinal fixed bearing at both ends of the beam support.
Continuous beam
Two or more spans above the beam, supported by the bearing beam.
2.1.3 truss truss
A planar or spatial lattice structure or component consisting of a number of bars, each of which is mainly subjected to various
With the resulting axial force, and sometimes also bear the node bending moment and shear force.
Steel beam
To steel as the main building material of the beam.
Strength
Material or component resistance to the ability to resist damage.
Normal stiffness stiffness
Structure or component resistance to deformation.
Deformation deformation
The relative displacement between the points in the structure or component caused by the action.
Deflection deflection
In the plane of the moment of action, the axis of the structural member or a point on the middle is caused by deflection perpendicular to the axis or the middle
To the line of displacement.
2.1.9 pre-camber camber
In order to offset the bridge across the structure under the action of the deflection of the load, and in the production of the deflection and the direction of the opposite
The amount of correction.
2.1.10 main truss (main beam) main truss (main beam)
In the superstructure, the various loads are supported and conveyed to the truss (beam) of the pier and table.
2.1.11 cross beam cross girder
In a steel beam structure, a beam is provided laterally along a bridge axis and supported on a main beam or main truss.
2.1.12 stringer stringer
In a steel beam structure, a beam is provided axially along the bridge and supported on a beam.
Bridge deck system
Support the bridge load and pass to the main beam bridge structure.
2.1.14 open bridge grid
Do not lay the ballast, in the longitudinal beam or the main beam on the bridge laying directly on the bridge.
Bearing bearing
The means for supporting the upper structure and securing the upper structure to a certain position may vary depending on the material, deformation or
Shape the classification. According to the material used in the bearing, can be divided into rubber bearings, steel bearings, PTFE bearings, etc .;
Deformation, can be divided into sliding bearings, fixed hinge seat; by shape, can be divided into curved bearings, spherical bearings and so on.
2.1.16 stress amplitude
The maximum stress of the component or connection is the difference between the minimum stress and the algebra.
2.1.17 fatigue allowable stress range for fatigue design
Component or connection in the 2 × 106 stress cycle under the fatigue strength.
2.1.18 operating power factor service impact factor
The force coefficient of a component or connection during fatigue inspection.
Damage correction factor
And the fatigue stress to match the amplitude, the design load effect into the bridge design life within the operating load
Fatigue cumulative damage coefficient.
2.1.20 Ultrasonic hammering ultrasonic hammering
A method of strengthening the surface of a toe to be joined by an ultrasonic device.
2.2 symbols
2.2.1 external force and internal force
N - axial force
M - bending moment
V - Shear
P - Allowable anti - skid bearing capacity of high strength bolts
2.2.2 Stress
2.2.3 Geometric properties
L0 - component length calculated
A - cross-sectional area
I - section moment of inertia
S - area moment
Λ - component slenderness ratio
Xyr, r - the radius of rotation of the member cross section on the XX axis and the YY axis
B - the center distance between the two main girders (or main trusses)
H - the height of the component
B - the width of the component
Fh - foot size
2.2.4 Calculate the coefficient
F - Dynamic coefficient of live load
0 - Anti - slip coefficient of steel surface with high strength bolted
F - friction coefficient of movable bearing
1
The reduction factor of the axial allowable stress of the center bar
2 - the allowable stress reduction factor of the member only when one main plane is bent
C - allowable stress increase coefficient under member oblique bending
M - Number of anti-skid surfaces at high-strength bolts
K - safety factor
3 material and basic tolerable stress
3.1 basic materials
3.1.1 The basic steel of railway steel bridge should be based on the minimum design temperature to meet the bridge design requirements to meet the chemical composition,
Mechanical properties, process performance and welding performance, and shall comply with the provisions of Table 3.1.1. The minimum design temperature for the bridge site calendar
Year extreme minimum temperature minus 5 ℃.
Table 3.1.1 Basic material of railway bridge
Name Steel Grade Quality grade should meet the standard
Steel beam main structure
Q235q D level
Current "structural steel for bridges" (GB/T 714). In kind
See Appendix A for technical conditions.
When the steel plate is subjected to the tensile force in the thickness direction,
To the performance requirements, in line with the existing national standard (GB/T 5313)
The relevant provisions.
Q345q D, E grade
Q370q D, E grade
Q420q D, E grade
Q500q D, E grade
Bridge auxiliary structure Q235-BZ current "carbon structural steel" (GB/T 700)
Connecting steel Q345C Current "low alloy high strength structural steel" (GB/T 1591)
rivet
BL2 (riveting snail 2)
BL3 (riveting snail 3)
The current "standard parts with carbon steel hot rolled round steel and wire rod"
(GB/T 715)
bolt
Refined bolts
BL2 (riveting snail 2)
BL3 (riveting snail 3)
The current "standard parts with carbon steel hot rolled round steel and wire rod"
(GB/T 715)
Thick bolts
BL2 (riveting snail 2)
BL3 (riveting snail 3)
The current "standard parts with carbon steel hot rolled round steel and wire rod"
(GB/T 715)
High-strength bolts
20MnTiB (20 manganese titanium boron) The current "alloy structural steel" (GB/T 3077)
35VB (35 vanadium boron) Current GB/T 1231 Appendix A
Nuts and washers
35,45
15MnVB (15 manganese vanadium boron)
The current "high-quality carbon structural steel" (GB/T 699)
Castings (bearing the pendulum, hem, rocker,
Seat board, etc.)
ZG230-450Ⅱ (cast steel 230-450 Ⅱ)
ZG270-500Ⅱ (cast steel 270-500 Ⅱ)
The current "general engineering cast carbon steel" (GB/T 11352)
Pin, hinge, roller shaft 35 forged steel "high quality carbon structural steel" (GB/T 699)
Round steel boom 35CrMo current "alloy structural steel" (GB/T 3077)
Note. After the test to obtain a sufficient basis, can also be used in line with the bridge structure requirements of other steel.
3.1.2 high-strength large hexagon head bolts, large hex nuts, washers should comply with the current national standard GB/T 1228 ~ 1231
Provisions.
3.1.3 welding performance should be matched with the substrate, the choice of welding materials, welding process should be based on design requirements through
Evaluation of welding process.
3.1.4 Railway steel bridge welded joints (including weld metal and heat affected zone) according to the lowest design temperature at the bridge site
The value of the impact toughness should not be less than the provisions of Table 3.1.4.
Table 3.1.4 Impact toughness of welded joints
Steel Grade Q345q Q370q Q420q Q500q
Test temperature (° C)
When the minimum design temperature ≥ 10 ℃, take -10 ℃
When -10 ℃> the minimum design temperature ≥ -20 ℃, take -20 ℃
When -20 ℃> the minimum design temperature ≥ -30 ℃, take -30 ℃
When -30 ℃> minimum design temperature ≥ -40 ℃, take -40 ℃
Weld joints of integral joints
Bulk joints perpendicular to the direction of the penetration of the welding butt welding, T-shaped angle
Welding, welding of welded joints
Bulk joints in the direction of the direction of non-penetration of the T-shaped fillet welds, edges and corners welds
Note. When the structure of the fracture performance of special requirements, the impact toughness of welded joints can be specified separately.
3.1.5 The coating material shall comply with the "Railway Steel Bridge Protective Coating and Coating Supply Technical Conditions" (TB/T 1527).
3.1.6 The elasticity of steel shall be determined in accordance with Table 3.1.6.
Table 3.1.6 Steel Elastic Coefficient
Elastic modulus E (MPa) Shear modulus G (MPa) Poisson's ratio ν
2.1 × 105 8.1 × 104 0.3
3.2 Basic allowable stress
3.2.1 The basic tolerable stresses of the steel shall be determined in accordance with Table 3.2.1.
3.2.2 weld basic allowable stress should be the same with the substrate, and should not be greater than the substrate allowable stress.
3.2.3 high strength bolts pre-tension design value should be based on high-strength bolts screw diameter, performance level according to Table 3.2.3
The provisions to determine.
3.2.4 When using anti-slip high-strength bolts, the design slip resistance should be 0.45.
3.2.5 Permissible stresses for rivets and refined bolts shall be determined in accordance with Table 3.2.5.
3.2.6 The total stability of the axial tolerable stress of the control center shall be determined in accordance with the provisions of Table 3.2.6.
3.2.7 The allowable stress amplitude of fatigue for various components or connections shall be determined in accordance with Table 3.2.7-1.
The basic and fatigue tolerances should be in accordance with Table 3.2.7-2.
Table 3.2.1 Basic allowable stresses
Note. 1 column of Q235qD, Q345qD, Q345qE allowable stress is GB/T 714 in the plate thickness t 50mm corresponding to the yield strength, when
T = 50mm, the allowable stress can be adjusted according to the proportion of yield points.
2 roller (rock) and the contact with the plate with different steel, the radial pressure to allow the use of its lower stress.
3 The symbol d in the table is the diameter of the roll, the rock shaft or the hinge shaft, in centimeters.
4 No. 2 directly placed on the deck of the bridge deck of the string bending allowable stress [σw] using [σ].
5 No. 7 Department of contact with the central angle of 2 × 45 ° consideration; conditions can be determined separately.
6 35CrMo only applies to boom.
Table 3.2.3 High Strength Bolt Prestress Design Value (kN)
Thread diameter M22 M24 M27 M30
Performance level 10.9S
Pre-tension design value.200 230 300 370
Note. When the high strength bolts are used for the deck and connection systems within the upper limit of the train building, the pre-tension design value may be appropriately reduced.
Table 3.2.5 Permissible stresses for rivets and refined bolts (MPa)
Note. 1 flat head rivet allowable stress should be reduced by 20%;
2 rivets calculate the diameter of the rivet hole diameter;
3 Refined bolt diameter up to 0.3mm smaller than the bolt diameter;
4 This table applies to BL2, when using BL3, the allowable stress can be increased by 10%.
Table 3.2.6 Axial Permissible Stress Reduction Factor for Center Compression Bar
Table 3.2.7-1 Fatigue tolerances of various components or connections
Fatigue allowable stress amplitude category fatigue allowable stress amplitude [σ0] (MPa) component and connection form
Note. When the bridge design temperature is lower than -40 ℃, the need for the corresponding low-temperature brittle material performance test,
And to the table fatigue fatigue stress to do a corresponding reduction.
Table 3.2.7-2 Component or connection Basic form and fatigue allowable stress amplitude category
Base material of the original rolling surface, side planing edge, surface roughness should not be
Greater than; precision cutting surface roughness should not be greater than; should not be arc on the base metal.
(1) single or double-sided stitching, the first row of bolts without slip;
(2) direct splicing section over 60% of the total cross-sectional area of the double-sided splicing symmetrical joints;
(3) non-transmission of the direction of the calculation of high-strength bolts fastening of the substrate;
4.2 (1) single or double-sided stitching, the first row of bolts by checking the force is greater than the anti-
(2) non-full-face splicing of the components, direct splicing section less than 60% of the total cross-section.
The net cross section of the plug
5 horizontal butt weld penetration (1) the use of submerged arc welding quality should meet the following requirements.
① positioning welding should not have cracks, welding slag, welding and other defects;
② the back of the weld should be removed to affect the welding of welding, slag and welding defects;
③ each layer of welding should be welding slag, remove the defect and then welding the next layer;
④ should be in the end of the rod from the end of 80mm on the lead plate on the Ⅲ truss members and beams in the transverse butt welds
5.1 thick equal width steel plate docking
5.2 equal thickness of different width steel plate docking
(2) weld to strengthen the direction of the high smooth grinding, welding toe Department
Do not stay horizontal wear marks;
(3) welds shall be tested by non-destructive testing, weld quality
Comply with the requirements of Class I welds in Appendix D;
(4) horizontal butt weld should be a continuous welding is completed,
Should not have broken arc, such as the occurrence of arc, arc at the arc should be welded into the weld 1. 5
After the slope and then continue to overlap 50mm after welding;
(5) the same location the number of welding rework should not exceed twice.
5.3 wide and equal width wide steel plate docking
6 longitudinal welds
(1) the use of submerged arc welding, gas shielded welding;
(2) the weld should be continuous;
(3) tension and fatigue control of the rod, the full length of the weld
Ultrasonic testing. The quality of the weld shall comply with Appendix D
Grade Ⅱ weld requirements;
(4) pressure and not subject to fatigue control of the bar, exploration Fan Fan
From the rod end to the site of the bolt hole 1m. Weld quality
Should meet the requirements of Class II welds in Appendix D;
(5) the same location welding repair should not be more than twice.
6 6.1 vertical continuous butt weld (1) weld should be a continuous welding is completed, if special
Situation and stop welding, welding before welding should be at the Department
Reason. With the original preheating temperature and welding process to continue
Welding. Weld surface to smooth the direction of grinding grinding
The whole shall not exceed the irregularities specified in Appendix E.
Injustice
(2) weld should not have more than 0.3mm on both sides of the undercut
Or pores with a diameter greater than or equal to 1 mm. Less than
1mm stomata, no more than 3 per meter, between
Distance should not be less than 20mm;
(3) submerged arc welding should be in the rod from the end of 80mm outside the starting plate, extinguished.
6.2 I-shaped continuous fillet weld (1) weld should be a continuous welding is completed, if special
Situation and stop welding, welding before welding should be at the Department
And the original preheating temperature and welding process
Continue welding;
(2) longitudinal fillet weld bite should not be greater than 0.3mm,
There should be no pores greater than or equal to 1mm in diameter.
Less than 1mm in diameter pores, not more than every meter
In 3, the spacing should not be less than 20mm;
(3) submerged arc welding should be 80mm away from the rod end
Outside the starting board, extinguished.
(2) board
Beam in the abdomen
Plate and cover
The longitudinal of the board
To the weld
(3) box
Shaped parts
Board pair
Take the edge
Fillet welds
(4) box
Shaped parts
In the whole
Node attached
Near change
Deep penetration
Bit of the edge
Fillet welds
6.3
Box-shaped components Corner welds (1) welds should be a continuous welding is completed, if special
Situation and stop welding, welding before welding should be at the Department
And the original preheating temperature and welding process
Continue welding;
(2) a bar has a different depth of penetration, such as the Department of welding
The surface of the same high, then the deep penetration of the weld from the arc should be
On the lead plate other than 80mm from the rod end,
Wrap a layer of weld before the weld should be a stop
The defects at the arc are cleared and the length should not be cleared
Less than 60mm. The depth of the groove changes in the transition zone
The slope should not be greater than 1.10. The last weld should be
In the rod from the end of 80mm outside the starting plate, extinguished;
(3) a bar has a different depth of penetration, such as the Department of groove
The bottom of the same high, then increase the weld from the arc
Rod end 80mm outside the lead plate, the terminal should be grinding
Repair, remove the defects clean. Clear the length of the arc
The degree should not be ......
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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