code of cold-formed thin-wall steel structures

Transcription

1 UDC NATIONAL STANDARD OFτ 哩 IE PEOPLE'S REPUBLIC OF CHINA 中华人民共和国国家标准 P GB 丁 echnical code of cold-formed thin-wall steel structures 冷弯薄璧型钢结构技术规范 E 皿 ued 00, September 27,2002 Implemeoted OR:'January 1, 创 ntly 1 蝠 1Ied by MlnIs 句.fC 刷刷回 tlon of the PIωple's Repobllc of Cbina G 创阳 ala 也 IÚJÚStratiOD of QoaUty S.peI 守郎郎 D. Qøarant1ne of 也 e People's Repablic of CIdOa lmp 但伽,.aod

2 NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA 中华人民共和国国家标准 Technical code of cold-formed thin-wall steel structures 冷弯薄壁型钢结构技术规范 GB ChiefDevelopment Department: Developm 巳 nt planning committee of Hubei province Approved Department: Minis 町 ofconstruction ofthe People's Republic ofchina Implementation Date: January 1, 2003 Beijing 2002

3 NOTICE This code is written in Chinese and English. The Chinese text shall be taken as the ruling one in the event of any inconsistency between the Chinese text and the English text

4 Notice of Promulgation for Ministry of Construction of the People's Republic of China No.63 Notice on Promulgation ofthe national standard "Technical code of cold-formed thin-wall steel structures" by Ministry of Construction. Hence th 巳 na 创 tl 旧 ona 剖 1 standard with a serial number of GB 怠 -2002, which shall come into force upon J anuary 1 时, Herein, Clauses are mandatory clauses, which must be forced strictly. At the same time, the former "Technical code of cold-formed thin-wall steel s 甘 uctures " GBJ is superseded. This Standard is published and issued by China Planning Press under the organization of the Institute of Norm and Ration of the Ministry of Construction of the People's Republic of China. Ministry of Construction of the People's Republic of China September 27, 2002

5 Contents 1 G 巳 neral J Terms and Symbols 川 Terms "...,... 口.. 门口 Symbols Materials Basic design provlslon Design principles ,_.,_ D 巳 sign index General regulation of structure Calculation of members... 电 Axial tensil 巳 m 巳 mber " Axial compressive member Flexural member Stretch bending memb 巳 r " Press bending member Compressive el 巳 ments in member Calculations and configurations of connection Calculations of conn 巳 ct lo n Configurations of connection Formed steel plate Calculations offormed steel plate Configurations of formed steel plate Purlin and wall beam Calculations ofpurlin Configurations ofpurlin Calculations of wall beam Configurations of wall beam Roof truss Calculations ofrooftruss 川 Configurations of rooftruss Rigid frame Calculations ofrigid frame Configurations ofrigid frame Manufacture, installation and anticorrosion Manufacture and installation Anticorrosion Appendix A Coefficient of calculation Appendix B Section characteristics Appendix C Calculation method of design values of strength 咐 ch 旧 JS 如吨位 effect of oold forrning...97 Appendix D The classification of the effect of corrosion and th 巳 mating and the maintaining annual limit of the priming lacquer, the surface lacquer of anticorrosion Wording explanations for this code

6 1 General This code has been worked out for the purpose of implementing the technical and economical policies of the country in design and construction of cold-formed thin-walled steel structure so that the design and construction can be technically advanced, economically reasonable, reliable and safe and ensure the quality ofthe works This code applies to the d 巳 sign and construction of cold-formed thin-walled steel structure works for building engineering This code does not cover the special requirements of structure which bearing dynamic loading directly and cold-formed thin-walled steel structure which und 巳 rgoing intense corrosive effect The design principles of this code are constituted according to the present National Standard "United Code for Design ofthe reliability ofbuilding Structure" GB When designing cold-formed thin-wall steel structure, it should ensure that the structure comply with the requirements of intension, stability and rigidity, and accord with the fireproofing and anticorrosion requirements during the course of transportation, installation and performance, the materials, structure schemes and configuration measures should be selected reasonably taken into account of engineering reality Apa 口 from the implementation of this code, the design and construction of cold-formed thin-wall steel structure shall also be in confo 口 nity with relevant standards being now in use in the country.

7 2 Terms and Symbols 2.1 Terms Elements member. The flatplate part between two adjacent longitudinal sides in thin-walled section steel Stiffened elements The elements which two longitudinal sides both connect with other elements Partially stiffened elements The elements which one longitudinal side connects with other elements, and the other is a element which is stiffened by the border crimp which accords with requirements Unstiffened elements The elements which one longitudinal side connects with other elements, and the other is a free element Uniformly compressed elements The elements, which undergo the effect ofaxis 's uniform pressure Non-uniformly compressed elements The elements which undergo the effect ofaxis 's linear non-uniform distributed stress Sub-elements The elements which one longitudinal side connects with other elements, and the other is connected with intermediate stiffener according with requirements, or which two longitudinal sides are both connect with intermediate stiffeners according with requirements Width-to-thickness ratio The ratio ofthe width and the thickness of elements Effective width-to-thickness ratio To simplify calculation, the width of elements is discounted when considering compressed elements' strength after using flexuosity. The ratio of the calculated width of elements after discounting and thickness. 2

8 Effect of cold forming The phenomenon that steel characteristics are changed because of cold forming Stressed skin action The capability that formed steel sheet system which is connected reliably with supporting member has can resist sheared deformation in the plane of element itself Flare groove welds The welds which connect fillets' to fillets' or fillets' to plates' inter space. 2.2 Symbols Action and action effect B 一一 Double moment; F 一一 -Concentrated load; M 一一 -Bending moment; N 一一 -Axes force; Nt 一一 -Tension that one connecting piece undergoing; Nv 一一 -Shearing force that one connecting piece undergoing; P 一一 -Pre-tension force of high-strength bo It; y 一一 -Shearing force Calculation index E 一一 -Elastic modulus of steel; G 一一 -Shearing modulus of steel; N\ 一一 -Designing values of shearing resist bearing capacity of each welding point in resistance spot welding; 1f t 一一一 Designing values oftensile bearing capacity of one bolt; 1f v 一一 -Designing values of resist bearing capacity of one bolt; 3