考虑下部柱支承四角锥网架结构动力响应分析
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摘要
近些年来破坏性地震造成了很多大空间网架结构中的支承杆件的屈曲、支座处支承杆的断裂等不同程度的破坏,如汶川地震、芦山地震均有此类情况发生,使得国内外的学者对其破坏机理的研究给予更高的重视。同时,对以往仅考虑上部网架结构本身结构特点而忽略下部支承结构在振动中的偶联影响的分析方法做了重新的审视。对地震作用下考虑下部结构的整体网架结构进行分析,以带有柱支承的正放四角锥和斜放四角锥的两种典型网架形式为例,在水平和竖向地震作用下,对不同刚度下部支承构件的网架结构抗震性能进行对比分析,同时研究了场地类型条件对于考虑下部柱支承网架结构的影响,分析给出不同刚度支撑在水平地震动反应谱和竖向地震动反应谱作用下对整体网架结构抗震性能的影响的具体范围,并提出对于两类常用四角锥网架结构的水平刚度作用系数和修正了原有的竖向地震作用系数。
In recent years,destructive earthquakes,such as the Wenchuan earthquake and the Lushan earthquake,have caused buckling of supporting members in large space grid structures and certain damages of bracing members,which attracted intense attentions of scholars to its failure mechanism. As a result,the conventional analyzing method,which only considers the characteristics of upper structure,and ignores the coupling effect between the supporting members and the upper structure,is reviewed. In this study,the grid structures with supporting columns are analyzed. With the regularly and obliquely placed quadrangular pyramid grid structures taken as the example,the seismic performances of grid structures with supporting columns of different stiffness are compared. In addition,the influence of site type on this kind of grid structure is evaluated. Consequently,the specific influence ranges from the varied stiffness on the grid structure under the impact of horizontal and vertical response spectrum are provided. Furthermore,the preliminary aseismic design methods are proposed for the two common types of grid structures.
In recent years,destructive earthquakes,such as the Wenchuan earthquake and the Lushan earthquake,have caused buckling of supporting members in large space grid structures and certain damages of bracing members,which attracted intense attentions of scholars to its failure mechanism. As a result,the conventional analyzing method,which only considers the characteristics of upper structure,and ignores the coupling effect between the supporting members and the upper structure,is reviewed. In this study,the grid structures with supporting columns are analyzed. With the regularly and obliquely placed quadrangular pyramid grid structures taken as the example,the seismic performances of grid structures with supporting columns of different stiffness are compared. In addition,the influence of site type on this kind of grid structure is evaluated. Consequently,the specific influence ranges from the varied stiffness on the grid structure under the impact of horizontal and vertical response spectrum are provided. Furthermore,the preliminary aseismic design methods are proposed for the two common types of grid structures.
引文
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[2]蓝倜恩,钱若军.新疆乌恰影剧院网架屋盖震害分析[J].建筑结构,1991(5):43-47
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[4]陈扬骥,沈祖炎,席春华.考虑屋面板共同作用时网架的抗震性能研究[C]//第六届空间结构论文集.广州,1992:236-241
[5]张毅刚,孔祥和.网架结构体系的水平抗震性能[J].工业建筑,1998,28(7):11-15(Zhang Yigang,Kong Xianghe.The aseismic characteristic of full structure system including space trusses under horizontal earthquake[J].Industrial Construction,1998,28(7):11-15(in Chinese))
[6]罗尧治,陈向阳,董石麟.组合网架的竖向地震响应分析[J].土木工程学报,2000,33(5):29-34(Luo Yaozhi,Chen Xiangyang,Dong Shilin.Vertical seismic behavior for composite space truss[J].China Civil Engineering Journal,2000,33(5):29-34(in Chinese))
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