冷弯薄壁型钢结构住宅组合墙体的稳定性研究
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摘要
由冷弯薄壁型钢墙架柱和石膏板、OSB板通过螺钉连接而成的组合墙体,是冷弯薄壁型钢结构住宅体系中主要的竖向承重单元。本文对组合墙体的稳定性能进行了研究,并提出了设计方法。
文中采用拟板法,将冷弯薄壁型钢结构住宅组合墙体简化为一个正交异性板肋体系的力学模型,运用截面形心法得到该正交异性板的等效刚度计算公式,并考察了影响等效刚度的各个因素。通过有限元分析,验证了简化计算模型与等效刚度计算公式的正确性。
从板的理论出发,推导组合墙体在竖向荷载作用下的稳定性,分析表明其主要与墙体的高厚比有关。文中推导了组合墙体计算高度的确定方法,通过对组合墙体厚度、墙架柱间距、墙面板材、门窗洞口等参数的分析,得到了组合墙体等效弹性模量、承重墙与否及门窗洞口等影响因素对允许高厚比的修正系数,给出了提高组合墙体稳定性的相应措施。
本文提出通过高厚比验算来保证组合墙体稳定性的设计方法,并给出设计实例,可供实际工程参考。
The assembled wall, which is composed of cold-formed steel wall studs, gypsum board and orient strand board(OSB) fixing with screws, is the main vertical bearing structure in the cold-formed steel residential buildings. In this article the stability of the assembled wall is researched, and a design method is offered.
Using the pseudo-plate method, the cold-formed steel stud wall assembly is simplified into a mechanical model of orthotropic plate system. Moreover, the formulas to calculate the equivalent stiffness of the orthotropic plate are presented by using the sectional center method, while the influencing factors of the equivalent stiffness are considered. By using the finite element analysis, the simplified model and the formulas have been verified to be valid.
Studying from the theory of the plate, the stability of the wall under vertical load is deduced, and the analysis shows that it is mainly related to the depth-thickness ratio of the wall. The method to determine the calculated height of the wall is derived. By analysing the parameters such as the depth of the wall, the spacing of the studs, the materials of the wall boards and the size of the hole, etc, the correction factors of the allowable depth-thickness ratio which is affected by the equivalent elastic modular, whether it is load bearing wall or not, and the hole size of its door and windows is presented. And the corresponding measure to improve the stability of the assembled walls has also been put forward.
The design method to assure the stability of the wall by checking the depth-thickness ratio is presented, also a design example is offered, for the reference in practical projects.
文中采用拟板法,将冷弯薄壁型钢结构住宅组合墙体简化为一个正交异性板肋体系的力学模型,运用截面形心法得到该正交异性板的等效刚度计算公式,并考察了影响等效刚度的各个因素。通过有限元分析,验证了简化计算模型与等效刚度计算公式的正确性。
从板的理论出发,推导组合墙体在竖向荷载作用下的稳定性,分析表明其主要与墙体的高厚比有关。文中推导了组合墙体计算高度的确定方法,通过对组合墙体厚度、墙架柱间距、墙面板材、门窗洞口等参数的分析,得到了组合墙体等效弹性模量、承重墙与否及门窗洞口等影响因素对允许高厚比的修正系数,给出了提高组合墙体稳定性的相应措施。
本文提出通过高厚比验算来保证组合墙体稳定性的设计方法,并给出设计实例,可供实际工程参考。
The assembled wall, which is composed of cold-formed steel wall studs, gypsum board and orient strand board(OSB) fixing with screws, is the main vertical bearing structure in the cold-formed steel residential buildings. In this article the stability of the assembled wall is researched, and a design method is offered.
Using the pseudo-plate method, the cold-formed steel stud wall assembly is simplified into a mechanical model of orthotropic plate system. Moreover, the formulas to calculate the equivalent stiffness of the orthotropic plate are presented by using the sectional center method, while the influencing factors of the equivalent stiffness are considered. By using the finite element analysis, the simplified model and the formulas have been verified to be valid.
Studying from the theory of the plate, the stability of the wall under vertical load is deduced, and the analysis shows that it is mainly related to the depth-thickness ratio of the wall. The method to determine the calculated height of the wall is derived. By analysing the parameters such as the depth of the wall, the spacing of the studs, the materials of the wall boards and the size of the hole, etc, the correction factors of the allowable depth-thickness ratio which is affected by the equivalent elastic modular, whether it is load bearing wall or not, and the hole size of its door and windows is presented. And the corresponding measure to improve the stability of the assembled walls has also been put forward.
The design method to assure the stability of the wall by checking the depth-thickness ratio is presented, also a design example is offered, for the reference in practical projects.
引文
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[4]何保康,李风,丁国良.冷弯型钢在房屋建筑中的应用与发展.中国钢铁年会论文集, 2001:64-66.
[5]王炎.我国轻钢结构住宅的现状与发展[J].中国水运(学术版), 2006, 6(5):213-214.
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[8]薛发.国外低层钢结构住宅发展概况[J].工程建设与设计, 2004(4):46-48.
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[3]弓晓芸,严虹.国外工业化钢结构住宅应用探讨.工业建筑, 2001, 31(8):17-19.
[4]何保康,李风,丁国良.冷弯型钢在房屋建筑中的应用与发展.中国钢铁年会论文集, 2001:64-66.
[5]王炎.我国轻钢结构住宅的现状与发展[J].中国水运(学术版), 2006, 6(5):213-214.
[6]刘承宗,周志勇.我国轻钢建筑及其发展问题探讨.工业建筑, 2000, 30(4):18-23.
[7]弓晓芸,严虹.浅谈轻钢结构低层住宅[J].钢结构, 2001(6):27-29.
[8]薛发.国外低层钢结构住宅发展概况[J].工程建设与设计, 2004(4):46-48.
[9] AISI/COS/PM 2001, standard for cold-formed steel framing-prescriptive method for one or two family dwelling[S].
[10] AISI 2001, commentary for the standard for cold-formed steel framing-prescriptive method for one or two family dwellings[S].
[11]国家建筑钢结构产业“十五”计划和2010年发展规划纲要[R].住宅产业, 2000(9).
[12]《中国建筑技术政策》(1996年～2010年)[S].
[13] JG/T182-2005,低层冷弯薄壁型钢结构装配式住宅技术要求[S].(待出版)
[14]周绪红,石宇,周天华,刘永健,狄谨.中国低层冷弯薄壁型钢住宅产品标准介绍[J]. 2005年第二届中国国际钢结构大会.
[15]周绪红,娄乃琳,刘永健,狄谨,石宇.低层轻型钢结构装配式住宅及其产品标准[J].住宅产业, 2004, 58(11):本刊专题.
[16]于炜文.冷成型钢结构设计[M].北京:中国水利水电出版社, 2003.
[17] Giles G, Green. Light Gage Steel Columns in Wall-Braced Panels[R]. Bulletin No. 35, part2, Engineering Experiment Station, Cornell University, 1947, 10.
[18] Timoshenko, S.P., and Gere. Theory of elastic stability, 2nd Ed[M]. McGraw-Hill, New York.
[19] Simman A , Pekoz T. Diaphragm Braced Members and Design of Wall Studs[J]. Journal of Structural Division, Proceedings ASCE, 1976, January, V102(1):77-92.
[20] American Iron and Steel Institute. Specification for the design of cold-formed steel structural members[S]. Washington:American Iron and Steel Institute, 1986.
[21] American Iron and Steel Institute. Specification for the design of cold-formed steel structural members[S]. Washington:American Iron and Steel Institute, 1996.
[22] Miller T H, Pekoz T. Behavior of Cold-Formed Steel Wall Stud Assembles[J]. Journal of Structural Engineering, ASCE, 1993, V119(2):641-651.
[23] Miller T H, Pekoz T. Behavior of Gypsum-Sheathed Cold-Formed Steel Wall Studs [J]. Journal of Structural Engineering, ASCE, 1994, V120(5):1644-1650
[24] Lee Y K. Behavior of gypsum-sheathed cold-formed steel wall stud panels[R]. PhD thesis, Oregon State University, 1999, Oreg.
[25] Lee Y K, Miller T H. Limiting Heights for Gypsum-Sheathed, Cold-Formed Steel Wall Studs[J]. Practice Periodical on Structural Design and Construction, ASCE 2001, 6(2):83-89
[26] Lee Y K, Miller T H. Axial Strength Determination for Gypsum-Sheathed, Cold-formed Steel Wall Stud Composite Panels [J]. Journal of Structural Engineering, ASCE, 2001, June, V127(6):608-615
[27] Telue Y, Mahendran M. Behavior of Cold-formed Steel Wall Frames Lined With Plasterboard [J]. Journal of Constructional Steel Research, 2001, 57:435- 452
[28] Telue Y, Mahendran M. Behavior and Design of Cold-formed Steel Wall Frames Lined With Plasterboard on Both Sides [J]. Engineering Structures, 2004, 26:567– 579
[29] Tian Y S, Wang J, Lu T J, Barlow C Y. An Experimental Study on the Axial Behavior of Cold-formed Steel Wall Studs and Panels[J]. Thin-Walled Structure, 2004, 42:557-573
[30] Tarpy T S, Hauenstein S F. Effect of Construction Details on Shear Resistance of Steel-stud Wall Panels[R]. Vanderbilt University. Nashville, TN, USA. A research project sponsored by AISI. 1978. Project No. 1201-412.
[31] Tarpy T S and Girard J D. Shear Resistance of Steel-Stud Wall Panels[J]. Sixth International Specialty Conference on Cold-formed Steel Structures. University of Missouri-Rolla, MO. 1982:449-465.
[32] Tissell J R. Structural Panel Shear Walls[R]. Report No.154, APA. Tacoma, WA, USA. 1993.
[33] Serrette R. Light Gauge Steel Shear Wall Tests[R]. Department of Civil Engineering, Santa Clara, University, Santa Clara, CA, 1994.
[34] Reynaud Serrette, Kehinde Ogunfunmi. Shear Resistance of Gypsum-sheathed Light-gauge Steel Stud Walls[J]. Journal of Structure Engineering, 1996, 122(4):383-389.
[35] Serrette R, Nguyen H, Hall G. Shear Wall Values for Light Weight Steel Framing[R]. Report No. LGSRG-3-96, Light Gauge Steel Research Group, Department of Civil Engineering, Santa Clara University. Santa Clara, CA, USA, 1996.
[36] Serrette R, Hall G, Nguyen H. Dynamic Performance of Light Gauge Steel Framed Shear Walls[J]. In Proceedings of the 13th International Specialty Conference on Cold-formed Steel Structures. St. Louis, MO, USA, 1996:487-498.
[37] Serrette R, Encalada J, Juadines M and Nguyen H. Static Racking Behavior of Plywood, OSB, Gypsum, and Fiberbond Walls with Metal Framing[J]. Journal of Structure Engineering, 1997, 123(8):1079-1086.
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