GB 50982-2014 PDF English
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| GB 50982-2014 | English | 370 |
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Technical code for monitoring of building and bridge structures
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GB 50982-2014: Technical code for monitoring of building and bridge structures---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB50982-2014
UDC
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
P GB 50982-2014
Technical code for monitoring
of building and bridge structures
Issued on. OCTOBER 09, 2014
Implemented on. AUGUST 01, 2015
Issued by. Ministry of Housing and Urban-Rural Development of PRC;
General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China.
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Technical code for monitoring
of building and bridge structures
Compiled by. Ministry of Housing and Urban-Rural Development of PRC
Approved by. Ministry of Housing and Urban-Rural Development of PRC
Date of implementation. August 01, 2015
China Building Industry Press
2014 Beijing
Announcement of Ministry of Housing and Urban-Rural
Development of the People's Republic of China
No. 583
Table of Contents
Foreword... 6
1 General provisions... 8
2 Terms and symbols... 8
2.1 Terms... 8
2.2 Symbols... 10
3 Basic requirements... 10
3.1 General requirements... 10
3.2 Monitoring system, point and equipment... 11
3.3 Construction monitoring... 14
3.4 Post construction monitoring... 18
4 Monitoring methods... 21
4.1 General requirements... 21
4.2 Stress and strain... 21
4.3 Deformation and crack... 23
4.4 Temperature and humidity... 26
4.5 Vibration... 28
4.6 Earthquake and seismic response... 29
4.7 Wind and wind-induced response... 30
4.8 Other items... 32
4.9 Patrol inspection and system maintenance... 34
5 High-rise building and structure... 34
5.1 General requirements... 34
5.2 Construction monitoring... 37
5.3 Post construction monitoring... 39
6 Long-span spatial structure... 42
6.1 General requirements... 42
6.2 Construction monitoring... 44
6.3 Post construction monitoring... 46
7 Bridge structure... 47
7.1 General requirements... 47
7.2 Construction monitoring... 49
7.3 Post construction monitoring... 51
8 Other structures... 55
8.1 Seismically isolated structure... 55
8.2 Crossing construction... 56
Appendix A Technical requirement of monitoring equipment... 58
Appendix B Monitoring requirement of different types of bridges... 60
Explanation of wording in this code... 63
List of quoted standards... 64
1 General provisions
1.0.1 In order to standardize the building and bridge structure monitoring
technology and the corresponding analysis and early warning, to achieve
advanced technology, reliable data and reasonable economy, this code is
hereby formulated.
1.0.2 This code is applicable to the monitoring of engineering structures such
as high-rise buildings and structures, long-span spaces, bridges and seismic
isolation structures, as well as the monitoring of existing structures affected by
the crossing construction.
1.0.3 Construction and bridge structure monitoring shall, in addition to
complying with the provisions of this code, also comply with the relevant
requirements of the current notational standards.
2 Terms and symbols
2.1 Terms
2.1.1 Structural monitoring
Frequent, continuous observation or measurement of the state of the structure.
2.1.2 Construction monitoring
Structural construction monitoring.
2.1.3 Post construction monitoring
Structural post construction monitoring.
2.1.4 Monitoring system
It is integrated by the software and hardware for the purposes of achieving a
certain monitoring function, composed of the monitoring equipment.
2.2 Symbols
fn - n order natural frequency;
l - Length or span;
n - Number of orders of vibration mode;
P - Thrust;
r - Conductor resistance;
T - Cable force;
δ - Relative deformation;
ε - Strain;
ρ - Unit length of mass.
3 Basic requirements
3.1 General requirements
3.1.1 Building and bridge structure monitoring shall be divided into construction
monitoring and post construction monitoring.
3.1.3 During the monitoring, it shall make patrol inspection and system
maintenance.
3.3 Construction monitoring
3.3.3 Construction monitoring item may include strain monitoring, deformation
and fracture monitoring, environment and effect monitoring. Deformation
monitoring may include foundation settlement monitoring, vertical deformation
monitoring and horizontal deformation monitoring; AND environment and
effects monitoring may include wind and wind-induced response monitoring,
temperature and humidity monitoring, and vibration monitoring.
4 Monitoring methods
4.1 General requirements
4.1.1 It is preferable for the monitoring items to include the strain monitoring,
deformation and fracture monitoring, temperature and humidity monitoring,
vibration monitoring, seismic and seismic response monitoring, wind and
wind-induced response monitoring, cable force monitoring, and corrosion
monitoring.
4.2 Stress and strain
4.2.1 Strain monitoring may be achieved by resistance strain gauges, vibrating
wire strain gauges, fiber strain gauges and other strain monitoring
components.
4.2.2 It is preferable to select the strain gauges based on monitoring purposes
and engineering requirements, as well as sensor technology and
environmental characteristics.
4.3 Deformation and crack
4.3.1 Deformation monitoring can be divided into horizontal displacement
monitoring, vertical displacement monitoring, three-dimensional displacement
monitoring, and other displacement monitoring.
4.4 Temperature and humidity
4.4.1 Temperature and humidity monitoring may include the environment and
component temperature monitoring AND environmental humidity monitoring.
4.4.2 Mass concrete temperature monitoring shall be in accordance with the
relevant provisions of the current national standard “Code for construction of
mass concrete” GB 50496.
4.5 Vibration
4.5.1 Vibration monitoring shall include vibration response monitoring and
vibration excitation monitoring. The monitoring parameters may be
acceleration, velocity, displacement and strain.
4.5.2 Vibration monitoring methods can be divided into relative measurement
and absolute measurement.
4.5.3 The structure vibration displacement monitoring by the relative
measurement method shall comply with the following requirements.
4.8 Other items
I. Cable force monitoring
5 High-rise building and structure
5.1 General requirements
5.1.1 In addition to the requirements of the design documents, high-rise
buildings and structures at the height of 250 m and above OR having vertical
structural components significant in compression and deformation shall be
subjected to the construction monitoring, AND the high-rise building and
structures having a height of 350 m and above shall be subjected to post
construction monitoring.
5.1.4 The foundation pit work having an excavation depth greater than or equal
to 5 m OR excavation depth of less than 5 m but the site geological conditions
and the surrounding environment more complex as well as other foundation pit
works which requires monitoring shall be subjected to monitoring in
accordance with Technical code for monitoring of building excavation
engineering GB 50497.
5.1.5 The construction monitoring items of the high-rise building and structures
shall be selected in accordance with the characteristics of the project from Table 5.1.5.
5.2 Construction monitoring
I. Sedimentation monitoring
5.2.1 During settlement monitoring, it shall first transfer the base point of work
AND then arrange the settlement measurement points based on regions, AND
it is preferable for the settlement monitoring points to be consistent with the
horizontal displacement monitoring point.
5.2.2 Deformation monitoring during construction period may include axis
monitoring, elevation monitoring, relative deformation monitoring of connected
components between building bodies, and monitoring of three-dimensional
spatial deformation of key points of the structure.
5.3 Post construction monitoring
I. Deformation monitoring
5.3.1 Deformation monitoring measurement point can be at the following locations.
5.3.14 It is preferable for the translating vibration monitoring measurement
points to be arranged in the stiffness center of the building.
5.3.15 It is preferable for the torsional vibration monitoring measurement points
to be arranged at the edge of the structure of the maximum rotation point.
5.3.16 As for the high-rise building and structures which had been subjected to
the vibration bench model test, it may distribute the measurement points in
accordance with the vibration bench model test results.
6 Long-span spatial structure
6.1 General requirements
6.1.1 In addition to the long-span spatial structure which shall be subjected to
construction monitoring in accordance with the requirements of the design
documents or other provisions, the long-span spatial structure shall be
subjected to the construction monitoring once complying with one of the
following conditions.
6.1.2 Ultra-high, overweight and long-span formwork support systems with
height over 8 m or span over 18 m, total construction load over 10 kN/m2 and
concentrated load over 15 kN/m shall be monitored.
6.1.3 In addition to the long-span spatial structure which shall be subjected to
post construction monitoring in accordance with the requirements of the design
documents or other provisions, the long-span spatial structure shall be
subjected to the post construction monitoring once complying with one of the
following conditions.
6.2.2 Deformation monitoring during construction may include deflection of
members, offset of center axis of support, height difference of highest and
lowest supports, height difference of adjacent supports, axis of rod,
perpendicularity of member, and sloping deformation monitoring.
6.2.3 After finishing the spatial structure installation, when monitoring the main
span deflection, the measurement points may be determined by the design unit.
When there is no design requirement, it shall monitor the mid-span deflection
for the span of 24 m and below; AND it shall monitor the deflection at the
mid-span and quarter-point along span direction for the span more than 24 m.
6.3 Post construction monitoring
I. Deformation monitoring
6.3.1 Measurement point arrangement for deformation monitoring during
construction shall be selected in accordance with Table 6.3.1.
6.3.2 During use, it is preferable to make strain monitoring for the key support
and the main stressed components; AND it is preferable to make strain
monitoring for the root or high stressed parts of the ultra-large overhang
cantilever structure.
6.3.3 During the use of cable structure, it shall regularly monitor the cable force;
AND when the difference between the cable force and the design value is
more than 10%, it shall make warning in time AND adjust or compensate the
cable force.
6.3.4 When the main membrane surface of the membrane structure is
subjected to wind and wind-induced response monitoring, it is preferable to
divide the monitored area into wind pressure and wind vibration main
monitoring area and the wind pressure secondary monitoring area, AND the
monitoring items are membrane surface vibration and wind pressure on the
upper and lower surfaces.
7 Bridge structure
7.1 General requirements
7.1.1 In addition to the bridge structures which shall be subjected to
construction monitoring in accordance with the requirements of the design
documents or other provisions, the bridge structures shall also be subjected to
the construction monitoring once complying with one of the following
conditions.
7.1.2 For particularly important ultra-large bridges, it shall make post
construction monitoring.
7.1.3 In addition to the bridge structures which shall be subjected to post
construction monitoring in accordance with the provisions of clause 7.1.2 of
this code, the requirements of the design documents or other provisions, the
bridge structures shall also be subjected to the post construction monitoring
once complying with one of the following conditions.
7.3.3 The post construction deformation monitoring frequency shall be
determined in combination with the bridge structure characteristics and service
life, which shall be not less than the regular inspection frequency; AND it is
preferable to make monitoring for the ultra-large bridge.
7.3.4 Strain monitoring measurement points shall be arranged in accordance
with the stressing characteristics of the bridge structure.
7.3.5 Strain monitoring shall be set with the warning value in accordance with
the strain amplitude of the structure during use.
7.3.6 The cable force monitoring of the suspension boom or sling, stay cable or
main cable shall comply with the following requirements.
7.3.7 Steel structure bridges shall be subject to fatigue monitoring; AND the
monitoring parameters may include fatigue stress and steel structure
temperature.
7.3.8 Dynamic response monitoring shall take into account the dynamic
characteristic test, AND the monitoring project may include the structure
natural frequency, vibration mode and damping ratio.
8 Other structures
8.1 Seismically isolated structure
8.1.1 In addition to the seismically isolated structure which shall be subjected
to monitoring in accordance with the requirements of the design documents or
other provisions, the seismically isolated structure shall be subjected to the
construction and post construction monitoring once complying with one of the
following conditions.
8.1.2 The measurement points of the seismically isolated layer shall be set at
the key parts of the seismically isolated layer. During construction, it shall
monitor the horizontal and vertical displacement of the seismically isolated
layer; AND during use, it shall also monitor the acceleration of the seismically
isolated layer and the structure top layer.
8.2 Crossing construction
8.2.1 underground works through the existing structure of regular wear and
side wear, the following conditions shall be carried out through the construction
monitoring.
8.2.4 All the important structures to be crossed shall be monitored in real time
during construction.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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