钢筋混凝土管柱-钢桁架混合结构抗震性能
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摘要
以某钢筋混凝土管柱-钢桁架竖向混合结构为背景,采用集中塑性铰有限元模型,对该结构进行动力弹塑性计算,分析了该结构的破坏机理.基于结构内容物的抗震设防指标,评价了结构的抗震性能水准,研究了钢筋混凝土管柱纵筋配筋率和壁径比对混合结构抗震性能的影响.研究表明,在7度罕遇地震作用下,该结构满足基于内容物的抗震设防基本要求;结构破坏集中在柱根,为单道防线的柱铰破坏模式;角柱与内柱为结构薄弱环节;钢桁架屈服杆件主要分布在悬挑端及与柱头连接的区域;建议该结构的柱纵筋最小配筋率不小于0.5%,柱壁径比不小于0.100.
By means of the plastic hinge method,an elastic-plastic model for an actual structure was established.The failure mechanism of the structure was analyzed by the elastic-plastic time-history analysis.According to the performance index of the internal-equipment-based seismic design method,the seismic performance of the structure,and the effect of the reinforcement ratio and wall diameter ratio of the concrete pipe column were analyzed.The results indicate that under the 7-degree intensity of the seldomly occurred earthquake,the seismic performance level of the structure is satisfied with the basic fortification requirement of the internal-equipment-based seismic design.The columns are the single defense line for the structure to resist the earthquake action,and the corner/inner columns are firstly damaged.Most plastic hinges of the steel truss occur in the cantilever range and around the top of the columns.The total longitudinal reinforcement ratio and wall diameter ratio of the concrete pipe column could be greater than 0.5% and 0.100,respectively.
By means of the plastic hinge method,an elastic-plastic model for an actual structure was established.The failure mechanism of the structure was analyzed by the elastic-plastic time-history analysis.According to the performance index of the internal-equipment-based seismic design method,the seismic performance of the structure,and the effect of the reinforcement ratio and wall diameter ratio of the concrete pipe column were analyzed.The results indicate that under the 7-degree intensity of the seldomly occurred earthquake,the seismic performance level of the structure is satisfied with the basic fortification requirement of the internal-equipment-based seismic design.The columns are the single defense line for the structure to resist the earthquake action,and the corner/inner columns are firstly damaged.Most plastic hinges of the steel truss occur in the cantilever range and around the top of the columns.The total longitudinal reinforcement ratio and wall diameter ratio of the concrete pipe column could be greater than 0.5% and 0.100,respectively.
引文
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[9]Cuong Ngo-Huu,Seung-Eock Kim,Jung-Ryul Oh.Nonlinear analysis of space steel frames using fiber plas-tic hinge concept[J].Engineering Structures,2007,29(4):649-657.
[2]Gao Xiufeng,Zhang Chengwei,Wei Jinjia,et al.Nu-merical simulation of heat transfer performance of an air-cooled steam condenser in a thermal power plant[J].Heat Mass Transfer,2009,45:1423-1433.
[3]白国良,李晓文,李红星,等.空冷凝汽器系统支架结构体系研究报告[R].西安:西安建筑科技大学土木工程学院,2005.
[4]李红星.大型火力发电厂空冷凝汽器支架结构体系研究[D].西安:西安建筑科技大学土木工程学院,2006.
[5]白国良,朱丽华,赵春莲,等.工作荷载与地震作用下直接空冷结构体系模型试验研究[J].建筑结构学报,2008,29(5):42-49.Bai Guoliang,Zhu Lihua,Zhao Chunlian,et al.Modeltest on behavior of direct air cooled condenser supportplatform under service load and earthquake action[J].Journal ofBuilding Structures,2008,29(5):42-49.(in Chinese)
[6]白国良,刘林,李晓文,等.空冷支架结构基于内容物的性能设计方法研究[J].建筑结构学报,2008,29(5):107-113.Bai Guoliang,Liu Lin,Li Xiaowen,et al.Study onperformance design method based on internal equipmentof support structure system of air cooled condenser[J].Journal of Building Structures,2008,29(5):107-113.(in Chinese)
[7]Scott M H,Fenves G L.Plastic hinge integration me-thods for force-based beam-column elements[J].Jour-nal ofStructural Engineering,2006,132(2):244-252.
[8]Chiou Jiunn-Shyang,Yang Ho-Hsiung,Chen Cheng-Hsing.Use of plastic hinge model in nonlinear pushoveranalysis of a pile[J].Journal ofGeotechnical and Geo-environmental Engineering,2009,135(9):1341-1346.
[9]Cuong Ngo-Huu,Seung-Eock Kim,Jung-Ryul Oh.Nonlinear analysis of space steel frames using fiber plas-tic hinge concept[J].Engineering Structures,2007,29(4):649-657.
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