基于能力谱方法的输电塔抗震性能评估  

Seismic performance evaluation of transmission towers based on capacity spectrum method

作　　者：王文明 盛寒柯 李荣帅 WANG Wenming;SHENG Hanke;LI Rongshuai(Department of Civil Engineering,Shandong Jianzhu University,Ji'nan 250101,Shandong,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101

出　　处：《地震工程学报》2024年第5期1052-1062,共11页China Earthquake Engineering Journal

基　　金：国家自然科学基金项目(51908340);山东省重点研发计划(重大科技创新工程)(2021CXGC011204)。

摘　　要：针对输电塔-线体系,采取一种基于能力谱方法的抗震性能评估方法。首先,将输电塔-线体系简化为集中质点模型,并进行Pushover分析,得到其顶点位移-基底剪力关系曲线。然后,根据输电塔场地类别和设防烈度等,将设计反应谱转化为需求谱;建立控制指标与抗震性能之间的对应关系,将输电塔抗震性能划分为五级并建立相应的量化评价模型;按照能力谱方法绘制输电塔的能力谱曲线和需求谱曲线,确定输电塔结构性能点,进而对其抗震性能进行评价。最后,采用能力谱对某输电塔进行抗震性能评估,并采用动力时程分析方法对其进行验证。分析结果表明,能力谱方法分析结果与时程分析结果具有较好的一致性,满足工程精度要求。采用SRSS荷载分布时,在多遇地震、设防地震和罕遇地震作用下,能力谱法得到的输电塔顶点水平位移相对误差均在5%以内,建议采用SRSS分布模式对输电塔进行Pushover分析。A seismic performance evaluation for the transmission tower-line system was conducted using the capability spectrum method.First of all,the transmission tower-line system was simplified into a concentrated mass model for Pushover analysis.This allowed for the creation of a relationship curve between vertex displacement and base shear force.Based on the site category and seismic fortification intensity of the transmission tower,the design response spectrum was transformed into a demand spectrum.The seismic performance of transmission towers was divided into five grades using control indexes.A corresponding quantitative evaluation model was constructed.Then,the capacity spectrum method was used to plot both the capacity spectrum curve and the demand spectrum curve of the transmission tower.This helped determine the performance points and evaluate the seismic performance of the transmission power.Finally,the seismic performance of an actual transmission tower was evaluated using the capacity spectrum method and was verified against dynamic time-history analysis.The analysis results from the capacity spectrum method closely matched those from the time-history analysis,meeting the requirements of engineering accuracy.Using the square root of the sum of the squares(SRSS)load distribution,the relative error of horizontal displacement at the top point of the transmission tower obtained by the capacity spectrum method is within 5%fortification,and rare earthquakes,so it is recommended to carry out.Therefore,it is recommended to perform a Pushover analysis on the transmission tower by using the SRSS distribution mode.

关 键 词：输电塔 能力谱方法 抗震性能 评估方法 时程分析 

分 类 号：TU311.41[建筑科学—结构工程]