空间钢桁架伞撑空冷支架结构多维地震反应分析
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摘要
针对火力发电厂机组容量的不断增加,钢桁架管柱空冷支架结构在高烈度区已很难满足结构性能要求的实际情况,提出了一种新的结构形式—空间钢桁架伞撑空冷支架结构,以此建立空间有限元模型分析结构的动力特性。在三条地震波输入下,分别计算结构的层位移、层间位移角及层剪力,对比双向水平地震动和多维地震动的计算结果,提出结构扭转作用比及考虑扭转地震动作用的调整系数。考虑到扭转地震动对结构的影响,建议对水平地震动计算得到的地震作用乘以增大系数。
As the increasing of the unit capacity in a power plant,the steel-truss RC pipe-column air-cooling condenser structure system in a high seismic intensity zone could not match the request of structure capability,so a new structural system—the space steel-truss steel brace air-cooling condenser stucture system is brought up as a solution.Here taking the space steel-truss steel-brace air-cooling condenser structure system as a research objecct,a space finite element model is built to analyze its dynamic properties.Its layer displacement,inter layer displacement angle and layer shear are calculated under three seismic waves respectively,the calculation results of two-direction level seismic-wave with multi-dimensional seismic-wave are compared,then,the torsional earthquake effect ratio and adjusting coefficient are suggested.Considering the impact of torsional seismic-wave on the structure,it is recommended that the earthquake effect of two-direction level seismic-wave is multiplied by the earthquake amplification factor.
As the increasing of the unit capacity in a power plant,the steel-truss RC pipe-column air-cooling condenser structure system in a high seismic intensity zone could not match the request of structure capability,so a new structural system—the space steel-truss steel brace air-cooling condenser stucture system is brought up as a solution.Here taking the space steel-truss steel-brace air-cooling condenser structure system as a research objecct,a space finite element model is built to analyze its dynamic properties.Its layer displacement,inter layer displacement angle and layer shear are calculated under three seismic waves respectively,the calculation results of two-direction level seismic-wave with multi-dimensional seismic-wave are compared,then,the torsional earthquake effect ratio and adjusting coefficient are suggested.Considering the impact of torsional seismic-wave on the structure,it is recommended that the earthquake effect of two-direction level seismic-wave is multiplied by the earthquake amplification factor.
引文
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[2]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,2005:45.
[3]徐培福,黄吉锋,韦承基.高层建筑结构在地震作用下的扭转振动效应[J].建筑科学,2000,16(1):1-6.
[4]徐培福,黄吉锋,韦承基.高层建筑结构的扭转反应控制[J].土木工程学报,2006,39(7):1-8.
[5]中华人民共和国建设部.JGJ3-2002.高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2002.
[6]中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局.GB50011-2010.建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[7]李宏男.地震动转动分量及有关的结构反应分析[J].世界地震工程,1989,(4):44-51.
[8]苏宁粉,白国良,付昊,等.空气冷凝汽器支架结构体系动力特性及周期计算公式研究[D].西安:西安建筑科技大学,2007:15.
[9]Moss Peter J,Carr Athol J.The effects of large displacementson the earthquake response of tall concrete frame structure[J].Bulletin of the New Zealand National Society for Earth-quake Engineering,1980,13(4):320-371.
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