【作者】 石宇；

【导师】 周绪红；

【作者基本信息】 长安大学 ， 结构工程， 2008， 博士

【摘要】 多层冷弯薄壁型钢结构在我国属于一种新型住宅体系，本文从研究冷弯薄壁型钢结构的主要抗侧力构件-组合墙体的抗震性能入手，并采用时程分析和基于性能的抗震设计方法，对多层冷弯薄壁型钢结构在水平地震作用下的抗震性能进行了系统的研究，以推动该结构在我国的推广应用，本文主要研究内容、方法和结论如下：1．采用足尺模型试件，研究墙面板材料、墙体开洞以及加载方式等因素对多层冷弯薄壁型钢组合墙体抗震性能的影响，分析了组合墙体的破坏特征、承载能力、刚度、延性以及耗能系数等。并在总结国内外相关试验的基础上，对影响组合墙体抗剪承载力的因素进行了详细的分析比较：①墙面板材料特性对墙体的抗剪承载力影响较大；双面板组合墙体的抗剪承载力约等于两类单面板组合墙体抗剪承载力之和；②墙体高宽比对其抗剪承载力影响微小；随着墙体开洞比率增大，墙体抗剪承载力明显减小；随着墙架柱截面尺寸，钢材厚度增加，墙架柱间距减小，墙体抗剪承载力增加；③随着墙体周边自攻螺钉间距减小，组合墙体抗剪承载力明显提高；④组合墙体在低周反复加载作用下，抗剪承载力比其在单调加载作用下平均低约10％。2．通过分析水平荷载作用下，冷弯薄壁型钢组合墙体荷载-层间转角滞回曲线的特征，采用试验拟合的方法，建立了能考虑刚度退化、滑移以及捏拢效应等特征的组合墙体退化四线型恢复力模型，并给出了恢复力模型中骨架曲线、滞回曲线各阶段刚度的确定方法。3．采用ANSYS有限元分析软件，建立多层冷弯薄壁型钢结构住宅的三维空间整体模型，对其进行模态分析，并选择合理的地震波分析其在水平地震作用下的时程反应，提出多层冷弯薄壁型钢结构在多遇地震作用下的弹性层间位移角限值为1／750；在罕遇地震作用下的弹塑性层间位移角限值为1／100。通过参数分析得出8度抗震设防地区，冷弯薄壁型钢结构住宅可以建到6层，高18m；在7度及以下抗震设防地区，冷弯薄壁型钢结构住宅的高宽比宜小于3；在8度抗震设防地区，冷弯薄壁型钢结构住宅的高宽比宜小于2．5。4．应用基于性能的抗震设计思想，结合我国现行抗震设计规范，并总结相关试验破坏特征，提出多层冷弯薄壁型钢结构住宅正常使用、可修和不倒塌三种性能水平下结构的损坏极限状态，以及三种预定性能水平下结构的位移目标。采用水平位移加载模式对多层冷弯薄壁型钢结构住宅进行推覆分析。且提出了冷弯薄壁型钢组合墙体基于位移设计的基本方法，并给出了水平荷载作用下组合墙体的侧移值计算公式，可供设计参考。更多还原

【Abstract】 Cold-formed steel framing system of mid-rise residential building is a new structural system.In order topromote the application of cold-formed steel framing system of mid-rise residential building in our country,thisthesis firstly studied the seismic resistance of cold-formed steel stud compound wall which played an importantrole in the wind and seismic resistance of this building system,then the seismic behavior of cold-formed steelframing system of mid-rise residential building under horizontal earthquake action was studied by time historyanalysis and performance-based seismic design approach.The study emphases,method and conclusions ofthe investigation were listed as following.1.Full-size tests were carried out to study the seismic resistance of cold-formed steel stud compound wall.The influence of the parameters,including material behavior of sheathing,hole ratios andloading type,on seismic resistance of cold-formed steel stud walls was analyzed by the test.The seismic performances of the composed walls such as failure traits,bearing capacity,ductility were discussed.Comparing with the experimental results in China and abroad,theseresults showed that:①Sheathings influenced wall’s shear resistance greatly;and the shearresistance of the double boards cold-formed steel stud compound wall was about equal to the sumof the two kinds of same single board compound wall.②Aspect ratio had little influence to theshear resistance of walls.With the increase of hole ratios,the specimen’s shear-resistance hadclearly decreased.With the increase of stud section,steel thickness and the decrease of studspacing,the wall’s load capacity increased obviously.③With the decrease of screw spacing inthe edge of wall,the wall’s load capacity increased obviously.④The shear resistance ofspecimens under monotonic loading increased by 10% that of the specimen under cyclicloading.2.According to the load-story drift curves,the thesis suggested four-linear restoring force modeof cold-formed steel stud compound wall under horizontal load.The characters of stiffness degradation,slip and pinched were showed in the restoring force mode.The thesis also gave the stiffnesscalculative formulas of exponential and hysteresis curves.3.Three-dimensional model of cold-formed steel framing system of mid-rise residential buildingwas established using the ANSYS program to study the mode of the system.Based on the time historyanalysis of the building system under horizontal earthquake action,the thesis suggested thatelastic angular displacement limited value under small earthquake was 1/750 and plasticangular displacement limited value under big earthquake was 1/100 of cold-formed steel framingsystem of mid-rise residential building.According to a detailed parametric study,the thesis draw the conclusion that cold-formed steel framing system was appropriate to be used in six-storeyresidences whose height was 18 meters where the seismic fortification intensity was 8,theheight to width ratio was limited to 3 where the seismic fortification intensity was 7 and 2.5where the seismic fortification intensity was 8.4.A performance-based seismic design approach of cold-formed steel framing system of mid-rise residentialbuilding was put forward through a direct-displacement methodology.According to the current ChineseCode for Seismic Design of Building and the deformation characteristics of this building system,the thesisprovided three different damage limit states corresponding to no damage,repairable and no collapserespectively and the target displacement to these performance levels.Displacement-pattern-basedseismic design method was adopted to analyse the cold-formed steel framing system of mid-riseresidential building.This thesis also suggested the displacement-based seismic design method ofcold-formed steel stud compound wall,and gave the displacement calculative formulas of wall,which could be referred by designers.更多还原