考虑填充墙影响的底层薄弱结构抗震性能分析
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摘要
填充墙既有减小结构周期而增大地震力的不利一面,也有增大结构层间侧移刚度的有利一面.汶川地震中,具有填充墙的底层薄弱结构破坏严重.根据等效刚度原则,把具有填充墙的框架转化为等效的纯框架,对七层底层薄弱结构进行小震下的弹性分析和大震下的弹塑性Pushover分析.结果表明,尽管填充墙使得结构中、上部层间角位移不同程度地减小,但却使得底层相对更加薄弱,层间变形比不考虑填充墙时大,填充墙对于底层薄弱结构有不利的影响.
In the frames filled with infill walls,infill walls have both negative effect(decreasing the structural period and increasing the earthquake action) and positive effect(increasing the story lateral stiffness) on the structure.There were a lot of failure phenomena occurring in this kind of building in Wenchuan earthquake.The method of equivalent stiffness is employed to transform the original frame with infill walls to the equivalent frame,and the elastic analysis under the minor earthquake and nonlinear static Pushover analysis under the severe earthquake of a 7-story building structure with the lower weak story is performed using the proposed method.The results show that the infill walls may reduce the story drift ratio of the middle and upper stories to some degree,however,they made the weak lower story much weaker relatively and cause the drift ratio of the weak story to become larger.Thus,the effect of infill walls is negative to the structures filled with infill walls with the lower weak story.
In the frames filled with infill walls,infill walls have both negative effect(decreasing the structural period and increasing the earthquake action) and positive effect(increasing the story lateral stiffness) on the structure.There were a lot of failure phenomena occurring in this kind of building in Wenchuan earthquake.The method of equivalent stiffness is employed to transform the original frame with infill walls to the equivalent frame,and the elastic analysis under the minor earthquake and nonlinear static Pushover analysis under the severe earthquake of a 7-story building structure with the lower weak story is performed using the proposed method.The results show that the infill walls may reduce the story drift ratio of the middle and upper stories to some degree,however,they made the weak lower story much weaker relatively and cause the drift ratio of the weak story to become larger.Thus,the effect of infill walls is negative to the structures filled with infill walls with the lower weak story.
引文
[1]李翔,吕西林,李建中,等.汶川地震中广元市底层框架结构房屋震害调查与分析[J].结构工程师,2008,24(3):12-15
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[5]KRAWINKLER H,SENEVIRATNA G D P K.Pros and cons of a pushover analysis of seismicperformance evaluation[J].Engineering Structures,1998,20(4-6):452-464
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[8]童岳生,钱国芳.砖填充墙钢筋混凝土框架房屋的抗震实用计算方法[J],建筑结构学报,1987(1):43-52
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[10]卢华.性能设计中的能力谱方法研究与工程应用[D].大连:大连理工大学,2005
[2]清华大学土木工程结构专家组等.汶川地震建筑震害分析[J].建筑结构学报,2008,29(4):1-9
[3]熊立红,杜修力,陆鸣,等.5.12汶川地震中多层房屋典型震害规律研究[J].北京工业大学学报,2008,34(11):1166-1172
[4]滕军,李祚华,和雪峰.基于汶川震害分析的强地震作用下结构地震累积损伤研究[J].工程抗震与加固改造,2008,30(6):7-14
[5]KRAWINKLER H,SENEVIRATNA G D P K.Pros and cons of a pushover analysis of seismicperformance evaluation[J].Engineering Structures,1998,20(4-6):452-464
[6]中华人民共和国建设部.GB 50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001
[7]高小旺,龚思礼,苏经宇.建筑抗震设计规范理解与应用[M].北京:中国建筑工业出版社,2002
[8]童岳生,钱国芳.砖填充墙钢筋混凝土框架房屋的抗震实用计算方法[J],建筑结构学报,1987(1):43-52
[9]沈聚敏,周锡元,高小旺,等.抗震工程学[M].北京:中国建筑工业出版社,2000
[10]卢华.性能设计中的能力谱方法研究与工程应用[D].大连:大连理工大学,2005
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