考虑高阶振型影响的输电塔抗震性能评估方法  

Seismic performance evaluation method for transmission tower considering higher modes

作　　者：余波[1,2,3] 陈嘉其 周强 张伟[1,2,3] YU Bo;CHEN Jia-qi;ZHOU Qiang;ZHANG Wei(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Engineering Disaster Prevention and Structural Safety of Ministry of Education,Nanning 530004,China;Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Nanning 530004,China;Zhejiang Scientific Research Institute of Transport,Hangzhou 311305,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]工程防灾与结构安全教育部重点实验室,广西南宁530004 [3]广西防灾减灾与工程安全重点实验室,广西南宁530004 [4]浙江省交通运输科学研究院,浙江杭州311305

出　　处：《广西大学学报（自然科学版）》2019年第1期24-32,共9页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金重点项目(51738004);国家自然科学基金资助项目(51469004;51668008)

摘　　要：为了考虑高阶振型对输电塔抗震性能的影响,结合振型侧向力组合方法(MLFC)和能力谱法提出了该类结构的抗震性能评估方法。首先根据输电塔的振型贡献系数识别主要贡献振型,然后考虑各振型侧向力的加权正负组合构建基于MLFC的侧向力组合模式,并采用能力谱法分析确定输电塔的能力曲线和性能指标,最后根据输电塔的抗震性能目标和顶部位移性能水准进行抗震性能评估,从而建立了考虑高阶振型影响的输电塔抗震性能评估方法。结合工程实例分析表明,基于MLFC的侧向力组合模式在抗震能力曲线和位移性能指标分析方面与增量时程分析法吻合较好,能够有效地考虑高阶振型对输电塔抗震性能的影响。In order to consider the influence of higher modes on seismic performance of transmission tower,an evaluation method was proposed based on the modal lateral force combination(MLFC) and the capacity spectrum method.The main participating modes were identified according to the higher modal contribution factors,while the lateral force combination patterns were constructed based on the MLFC by taking into account the weighted plus minus combination of each mode.Then the capacity curves and performance indexes for transmission tower were determined by the capacity spectrum method,while seismic performance was evaluated according to the seismic performance targets and performance levels for top displacement.Finally,seismic performance evaluation method for transmission tower which took into account the influence of higher modes was proposed.Case study of engineering project indicates that the capacity curves and performance indexes evaluated by the proposed method agree well with those obtained from the incremental time history analysis method,which demonstrates that the proposed method provides an efficient way to investigate the influence of higher modes on the seismic performance of transmission tower.

关 键 词：输电塔 高阶振型 振型侧向力组合 能力谱法 抗震性能评估 

分 类 号：TU352.11[建筑科学—结构工程]