GB 50322-2011 English PDFUS$2159.00 · In stock
Delivery: <= 13 days. True-PDF full-copy in English will be manually translated and delivered via email. GB 50322-2011: Code for design of grain steel silos Status: Valid GB 50322: Historical versions
Basic dataStandard ID: GB 50322-2011 (GB50322-2011)Description (Translated English): Code for design of grain steel silos Sector / Industry: National Standard Classification of Chinese Standard: P34 Classification of International Standard: 91.040.20 Word Count Estimation: 98,95 Date of Issue: 2011-07-26 Date of Implementation: 2012-06-01 Older Standard (superseded by this standard): GB 50322-2001 Quoted Standard: GB 50009; GB 50010; GB 50011; GB 50016; GB 50017; GB 50018; GB 50034; GB 50055; GB 50057; GB 50058; GB 50140; GB 17440; LS/T 1201; LS/T 1204; LS 1206; LS/T 1203 Regulation (derived from): Ministry of Housing and Urban Notice No. 1097 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Summary: This Chinese standard applies to planar shape is round, center loading, unloading grain steel silo design. GB 50322-2011: Code for design of grain steel silos---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.1 General 1.0.1 In order to sum up the experience in the construction of grain steel silos in my country and make the design of grain steel silos safe, reliable, advanced in technology and economically reasonable, this specification is formulated. 1.0.2 This specification is applicable to the design of grain steel silos with a circular plane shape and central loading and unloading. 1.0.3 The design service life of grain steel silos should not be less than 25 years. 1.0.4 The safety level of the grain steel silo structure shall be Class II, the seismic fortification category shall be Class C, and the fire resistance class may be Class II. 1.0.5 Grain steel plate silos shall be designed by units with relevant design qualifications. 1.0.6 The design of steel plate silos for grain shall not only comply with this code, but also comply with the current relevant national standards. 2 Terms and symbols2.1 Terminology 2.1.1 grain steel silo Steel structure upright containers for storing grain bulk materials, the plane is mainly circular. The main forms are welded steel plate, spiral edged steel plate, bolted corrugated steel plate, bolted ribbed steel plate, bolted ribbed double wall and assembled steel structure frame, etc. 2.1.2 grain granular material Wheat, corn, rice, beans and grain bulk materials with similar physical properties. 2.1.3 Bulk solids The steel silo contains the bulk grain material. 2.1.4 top of silo A structure that closes the top surface of the bin body. 2.1.5 building above top of silo A building built on the roof of the warehouse according to the technical requirements. 2.1.6 Wall of silo The vertical wall of the bin body that is in direct contact with the grain bulk material and bears the lateral pressure of the grain bulk material. 2.1.7 Supporting wall Support the vertical wall of the warehouse body. 2.1.8 Supporting structure of silo bottom The support structure above the foundation and below the warehouse body, including cylinder walls, columns, buttresses, etc. 2.1.9 Funnel hopper The lower part of the silo is a structural container for unloading grain bulk materials. 2.1.10 Shencang deep bin The silo whose ratio of the calculated height hn of grain storage to the inner diameter dn of the silo is greater than or equal to 1.5. 2.1.11 shallow bin The silo whose ratio of calculated grain storage height hn to silo inner diameter dn is less than 1.5. 2.1.12 single warehouse single silo A single silo that is not integrated with other buildings (structures). 2.1.13 warehouse group group silos Multiple silos arranged in groups. 2.1.14 Filler The bottom of the silo constitutes the filling material for unloading and filling slopes. 2.1.15 Overall flow mass flow During the grain unloading process, the horizontal section of the grain bulk material in the warehouse flows downward in a plane state. 2.1.16 Tubular flow funnel flow During the grain unloading process, the surface of the grain bulk material in the warehouse flows downward in a funnel shape. 2.1.17 Concentric discharge During the grain unloading process, the bulk grain in the silo flows symmetrically downward along the geometric center of the silo. 2.1.18 Eccentric discharge During the grain unloading process, the bulk grain in the silo flows asymmetrically downward along the geometric center of the silo. 2.1.19 work tower The place where grain transportation, measurement, cleaning and other work are carried out. 2.1.20 tunnel underpass The underground passage between the silo and the silo, and between the silo and the working tower. 2.2 Symbols 2.2.1 Geometric parameters h - the height from the ground to the top of the warehouse wall; hn—calculated height of grain storage; hh——the height from the top surface of the funnel to the calculation section; S——Calculation depth, the distance from the center of gravity of the silo roof or grain storage cone to the calculation section; dn - the inner diameter of the silo; R - the radius of the silo; t - the thickness of the silo wall or the calculated thickness of the silo wall, and the thickness of the steel plate; e - base of natural logarithm; a - the angle between the wall of the funnel and the horizontal plane. 2.2.2 Calculation coefficients k——the lateral pressure coefficient of grain storage; kp—the vertical compression stability coefficient of the silo wall; ρ—the hydraulic radius of the horizontal net section of the silo; Ch——Correction coefficient of dynamic horizontal pressure of grain stored in Shenzhen; Cv - dynamic vertical pressure correction coefficient of deep storage grain; Cf——Shenzhen stored grain dynamic friction correction coefficient. 2.2.3 Physical characteristic parameters of grain bulk materials γ——gravity density; ρ0—mass density of grain; μ——the friction coefficient of stored grain against the silo wall; Φ——Internal friction angle of stored grain. 2.2.4 Properties and resistance of steel E - elastic modulus of steel; f——design value of steel tensile and compressive strength; ftw—design value of tensile strength of butt weld; fcw——design value of compressive strength of butt weld; ffw—design value of tensile, compressive and shear strength of fillet weld; σcr—critical stress of compression member. 2.2.5 Actions and action effects Phk——Standard value of the horizontal pressure acting on the unit area of the warehouse wall by the stored grain; Pvk—Standard value of vertical pressure acting on unit horizontal area of stored grain;3 Basic Regulations3.1 Layout principles 3.1.1 The plane and vertical layout of grain steel silos should be determined after technical and economic comparisons based on technology, terrain, engineering geology and construction conditions. 3.1.2 The warehouse group should adopt single-row or multi-row determinant layout (Figure 3.1.2). Figure 3.1.2 Schematic diagram of warehouse group layout 1—working tower; 2—silo The net spacing of silos shall be determined according to the following principles. 1 shall not be less than 500mm; 2 When the independent foundation is adopted, the requirements for foundation design shall also be met; 3 The floor type flat bottom warehouse shall be determined according to the distance required by the clearance equipment. 3.1.3 Settlement joints should be set in the tunnel between silos and between silos and working towers. 3.1.4 For the trestle between silos and between silos and working towers, the relative displacement of adjacent structures due to foundation deformation should be considered. When the requirements of article 5.5.3 of this specification are met, the relative horizontal displacement value can be determined by the following formula. △μ≥h/400 (3.1.4) In the formula, △μ——relative horizontal displacement value; h - the height from the outdoor ground to the top of the warehouse wall. 3.1.5 In the design documents of the construction drawing of the grain steel silo, the requirements for the first loading and unloading of grain, settlement observation, benchmarking point and settlement observation point setting requirements shall be explained, and shall comply with the provisions of Appendix A of this specification. Pfk——Standard value of the vertical friction force acting on the unit area of the warehouse wall by the stored grain; Pnk—Standard value of the normal pressure of stored grain acting on the unit area of the slope of the funnel; Ptk—Standard value of tangential pressure acting on the unit area of funnel slope by stored grain; M——Design value of bending moment, for those with subscripts, see the description of the application; N——Design value of tensile force or compressive force, for those with subscripts, see the instructions at the place of application; σ——tensile stress or compressive stress, for those with subscripts, see the description of the application. 3.2 Structure selection 3.2.1 Grain steel plate silo structure (Fig. 3.2.1) can be divided into six basic parts. silo building, silo roof, silo wall, silo bottom, silo support structure and foundation. Figure 3.2.1 Schematic composition of the steel silo structure 1—the building on the warehouse; 2—the roof of the warehouse; 3—the wall of the warehouse; 4—bottom of warehouse; 5—supporting structure; 6—foundation 3.2.2 The process conveying equipment channel and operation and maintenance platform set on the warehouse should adopt open steel structure. When there are special requirements for use, the closed type can be used. 3.2.3 The roof of the grain steel silo should adopt a truncated cone roof with upper and lower ring beams, and its structure type should be determined according to calculation. 3.2.4 When the grain steel silo walls are corrugated plates, spiral beaded plates, or ribbed steel plates, hot-dip galvanized or alloy steel plates shall be used. 3.2.5 The steel or reinforced concrete silo bottom and support structure under the silo can be used for grain steel silos. When the diameter is less than 12m, the support structure under the overhead silo supported by columns or cylinder walls and the bottom of the funnel silo should be used; when the diameter is 15m or more, the floor-standing flat-bottomed silo and tunnel-type discharge channel should be used (Figure 3.2.5). (a) Cone bucket silo bottom (b) Floor silo flat silo bottom Figure 3.2.5 Schematic diagram of steel silo bottom4 Combinations of loads and load effects4.1 Basic regulations 4.1.1 For the structural design of grain steel silos, the following loads should be calculated. 1 Permanent load. self-weight of the structure, weight of fixed equipment, self-weight of hanging cables in the warehouse, etc.; 2 Variable loads. building live loads, snow loads, wind loads, etc. on the warehouse roof and on the warehouse; 3 Grain storage load. the effect of stored grain on the silo, the effect of stored grain on the hanging cables in the silo, etc.;4 Earthquake action4.1.2 The values of various loads, except for the provisions of this code, shall be carried out in accordance with the relevant provisions of the current national standard "Code for Building Structure Loads (2006 Edition)" GB 50009. 4.1.3 The physical characteristic parameters of the stored grain shall be determined by the technical professional through experimental analysis. When there is no test data, it can be determined according to the data listed in Appendix C of this specification. 4.1.4 When calculating the stored grain load, the parameters of the stored grain species that have the most unfavorable effect on the structure should be used. When calculating the friction effect of stored grain on the corrugated steel silo wall, the internal friction angle of stored grain should be taken. When calculating the friction effect of stored grain on the ribbed steel silo wall, the internal friction angle of stored grain and the external friction angle of stored grain against steel plate can be taken in sections. 4.1.5 The calculated height hn of grain storage and the hydraulic radius ρ of the horizontal net section shall be determined according to the following provisions. 1 The hydraulic radius ρ is calculated according to the following formula. ρ=dn/4 (4.1.5) In the formula. hn—calculated height of grain storage; ρ—hydraulic radius of the net section of the silo; dn—the inner diameter of the silo. 2 The calculated height hn of grain storage shall be determined according to the following provisions. 1) Upper end. when the top surface of the stored grain is horizontal, take it to the top surface of the stored grain; when the top surface of the stored grain is inclined, take it to the center of gravity of the stored grain cone; 2) Lower end. when the bottom of the bin is a conical funnel, take it to the top of the funnel; when the bottom of the bin is flat, take it to the top of the bottom of the bin; lowest point of the line. 4.1.6 The wind carrier type coefficient of the grain steel silo shall be taken according to the following regulations. 1 When calculating the stability of the warehouse wall. take 1.0; 2 When calculating the overall silo. for a single silo, take 0.8; for a group of silos, take 1.3. 4.2 Grain storage load 4.2.1 When calculating the effect of grain on the silo, the following four forces should be included. 1 Horizontal pressure acting on the silo wall; 2 Vertical friction acting on the silo wall; 3 Vertical pressure acting on the bottom of the silo; 4 Suspension cable tension acting on the roof of the silo. 4.2.2 The standard value of the static pressure of deep-stored grain (Figure 4.2.2) shall be calculated according to the following formula. 1 At the calculation depth S, the horizontal pressure standard value Phk of stored grain acting on the unit area of the warehouse wall is calculated according to the following formula. Phk=γ·ρ/μ(1-e-μks/ρ) (4.2.2-1) 2 At the calculation depth S, the standard value of the vertical pressure Pvk of the stored grain acting on the unit horizontal area is calculated according to the following formula. Pvk= [γ·ρ/(μ·k)](1-e-μks/ρ) (4.2.2-2) 3 At the calculation depth S, the standard value of the vertical friction force Pfk acting on the unit area of the warehouse wall by the stored grain is calculated according to the following formula. Pfk=μ·Phk (4.2.2-3) 4 At the calculation depth S, the standard value qfk of the total vertical friction force acting on the unit perimeter of the warehouse wall is calculated according to the following formula. qfk=ρ·(γ·S-Pvk) (4.2.2-4) In the formula. Phk—the standard value of the horizontal pressure acting on the unit area of the warehouse wall by the stored grain; γ—gravity density of stored grain; ρ—hydraulic radius of the net section of the silo; μ——the friction coefficient of stored grain against the silo wall; e - base of natural logarithm; k——Pressure coefficient of grain storage side, take the value according to Table D.1 of Appendix D; S——the distance from the top surface of the grain storage or the center of gravity of the grain storage cone to the calculated section; Pvk—Standard value of vertical pressure acting on unit horizontal area of stored grain; Pfk——Standard value of the vertical friction force acting on the unit area of the warehouse wall by the stored grain; qfk——Standard value of the total vertical friction force of stored grain acting on the perimeter of the warehouse wall unit. Figure 4.2.2 Schematic diagram of deep storage grain pressure 1—the top of the storage material is a plane; 2—the top of the storage material is a slope; 3—the center of gravity of the storage cone; 4—the calculation section 4.2.3 In the process of unloading grain from deep silos, the standard value of dynamic pressure of stored grain acting on the silo wall should be multiplied by the standard value of static pressure by the dynamic pressure correction factor. The dynamic pressure correction coefficient of deep-stored grain should be selected according to Table 4.2.3 Table 4.2.3 Dynamic Pressure Correction Coefficient of Grain Storage in Shenzhen Note. When hn/dn≥3, the Ch value in the table should be multiplied by 1.1. 4.2.4 The standard value of shallow storage grain pressure (Figure 4.2.4) shall be calculated according to the following formula. 1 At the calculation depth S, the horizontal pressure standard value Phk acting on the unit area of the silo wall is calculated according to formula (4.2.4-1)., the horizontal pressure of the stored grain acting on the silo wall shall be calculated according to the formula (4.2.2-1) in addition to the above formula, and the calculation results of the two shall take the larger value. Phk=k·γ·S (4.2.4-1) 2 At the calculation depth S, the standard value of vertical pressure Pvk acting on the unit horizontal area is calculated according to the following formula. Pvk=γ·S (4.2.4-2) 3 At the calculation depth S, the standard value of the vertical friction force Pfk acting on the unit area of the warehouse wall by the stored grain is calculated according to the following formula. Pfk=μ·k·γ·S (4.2.4-3) 4 At the calculation depth S, the standard value qfk of the total vertical friction force acting on the unit perimeter of the warehouse wall is calculated according to the following formula. qfk=1/2·k·μ·γ·S2 (4.2.4-4) Figure 4.2.4 Schematic diagram of shallow storage grain pressure 1—the top of the storage material is a plane; 2—the top of the storage material is a slope; 3—the center of gravity of the storage cone; 4—the calculation section 4.2.5 The standard value of the stored grain pressure acting on the wall of the circular funnel is calculated according to the following formula. 1 The normal pressure standard value Pnk on the unit area of the funnel wall is. Deep position. Pnk＝Cv·Pvk·(cos2α ksin2α) (4.2.5-1) Shallow position. Pnk＝Pvk·(cos2α ksin2α) (4.2.5-2) 2 The standard value of tangential pressure Ptk on the unit area of the funnel wall is. Deep position. Ptk＝Cv·Pvk(1-k)sinα·cosα (4.2.5-3) Shallow position. Ptk＝Pvk(1-k)sinα·cosα (4.2.5-4) In the formula. Pvk——Standard value of vertical pressure of stored grain acting on unit horizontal area. The deep warehouse can take the top surface value of the funnel, and the shallow warehouse can take the average value of the top and bottom surfaces of the funnel; α—the angle between the wall of the funnel and the horizontal plane. 4.2.6 The pulling force of the hanging cable acting on the roof of the silo includes the self-weight of the cable, the friction force of the stored grain on the cable, and the force caused by the blocking of the stored grain by the protrusion of the cable. When the cable has a circular cross-section, the diameter does not change, and the surface has no protrusions, the standard value of the friction force of the stored grain on the cable should be calculated according to the following formula. Deep warehouse. Nk＝kd·π·d·ρ·μ0/μ·(γ·hd-Pvk) (4.2.6-1) Asakura. Nk＝π/2·kd·d·μ0·k·γ·hd2 (4.2.6-2) In the formula. Nk - the standard value of the friction force of the stored grain on the cable; kd——Calculation coefficient 1.5~2.0; take a small value for a shallow position, and a large value for a deep position; d - cable diameter; hd - the length of the cable in the grain storage; μ0——the friction coefficient of the stored grain on the surface of the cable; Pvk——Standard value of the vertical pressure of stored grain acting on the unit horizontal area at the lowest end of the cable. 4.3 Earthquake action 4.3.1 The grain steel silo can be calculated as a single silo for seismic action, and should meet the following requirements. 1 The local effect of grain on the warehouse wall may not be considered; 2 The vertical seismic action may not be considered for the floor-type flat-bottom grain steel silos. 4.3.2 When calculating the horizontal earthquake action of grain steel silos, the representative value of gravity load should take 80% of the total weight of stored grain, and the center of gravity should take the center of gravity of the total weight of stored grain. 4.3.3 The horizontal seismic action of grain steel silos can be calculated by using the bottom shear force method or mode decomposition response spectrum method. 4.3.4 For grain steel silos supported by columns, the single-mass system model can be used when calculating the horizontal earthquake action with the bottom shear method, and it meets the following requirements. 1 The position of the single mass point......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB 50322-2011_English be delivered?Answer: Upon your order, we will start to translate GB 50322-2011_English as soon as possible, and keep you informed of the progress. 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