钢筋混凝土平板-T形柱结构的静力弹塑性分析研究
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摘要
为了研究钢筋混凝土平板-T形柱结构在地震作用下的耗能工作机理,本文以按照7度设防烈度的标准设计的钢筋混凝土平板-T形柱结构作为研究对象,应用ETABS通用分析程序,以侧向力分布方式、柱网尺寸、楼层层高和楼层数量作为分析参数,对该结构进行了静力弹塑性分析,并运用了能力谱方法对该结构进行了评价。分析表明,该结构的塑性铰分布均匀,大部分构件参加抗震耗能,薄弱层出现在首层,属于强柱弱梁型的理想抗震结构体系。该结构满足现行规范关于弹塑性层间位移角的限值,具有抵御7度罕遇地震作用的能力。通过结构抗震评价强调了基于结构的性能水准的设计理念比目前基于承载力的设计理念要合理,是结构抗震设计的发展方向。
In order to study the energy dissipation mechanism of reinforced concrete flat slab-T-shaped column structures under the earthquake action,the typical reinforced concrete structures of this kind designed according to 7th seismic fortification intensity,which were modeled on a series of parameters such as lateral force distribution,span sizes,story heights and total heights,were analyzed in the elasto-plastic condition by ETABS analysis program.Then the seismic performances of the structures were evaluated by the capacity-spectrum procedure.The analysis results show that the structures,in which the plastic hinges are well distributed and most of elements participate in energy dissipation,behave as the perfect seismic performance of strong column-weak beam structure system with the soft story occurred in the first story.The structures can satisfy the specified value of elasto-plastic story drift in the current code and have seismic performance against 7th intensity rare earthquake.According to the seismic performance,it is clear that the seismic design procedure based on performance level,which can represent the direction of the improved seismic design,is more reasonable than the seismic design procedure based on strength.
In order to study the energy dissipation mechanism of reinforced concrete flat slab-T-shaped column structures under the earthquake action,the typical reinforced concrete structures of this kind designed according to 7th seismic fortification intensity,which were modeled on a series of parameters such as lateral force distribution,span sizes,story heights and total heights,were analyzed in the elasto-plastic condition by ETABS analysis program.Then the seismic performances of the structures were evaluated by the capacity-spectrum procedure.The analysis results show that the structures,in which the plastic hinges are well distributed and most of elements participate in energy dissipation,behave as the perfect seismic performance of strong column-weak beam structure system with the soft story occurred in the first story.The structures can satisfy the specified value of elasto-plastic story drift in the current code and have seismic performance against 7th intensity rare earthquake.According to the seismic performance,it is clear that the seismic design procedure based on performance level,which can represent the direction of the improved seismic design,is more reasonable than the seismic design procedure based on strength.
引文
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[3] 汪大绥,贺军利,张凤新.静力弹塑性分析(Pushover Analysis)的基本原理和计算实例[J].世界地震工程,2004,20(1):45~53.
[4] GB50011-2001建筑抗震设计规范[S].
[5] 李光星.后张无粘结预应力混凝土平板-T形柱结构设计法研究[D].华南理工大学,2005.
[6] 天津市建委.DB29-16-2003钢筋混凝土异形柱结构技术规程[S].2003.
[7] CSI.CSI Analysis Reference[R].Computers and Structures,Inc,Berkeley,California,2004.
[8] 蔡健,李光星,李,吴源青.无粘结预应力混凝土平板-T形中柱节点抗震性能试验研究[J].建筑结构学报,2004,25(6):37~43.
[9] 曹万林,王光远,吴建有,魏文湘.不同方向周期反复荷载作用下L形柱的性能[J].地震工程与工程振动,1995,15(1):67~72.
[10] 曹万林,王光远,魏文湘,吴建有.不同方向周期反复荷载作用下T形柱的性能[J].地震工程与工程振动,1995,15(4):76~84.
[11] 季征宇,施永昌,田炜,黄磊.结构弹塑性静力分析(NSP)在宽肢异形柱结构设计中的应用[J].建筑结构,2003,33(9):20~23.
[12] 过镇海.钢筋混凝土原理[M].清华大学出版社,北京,1993.
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