Seismic performance evaluation of transmission towers based on capacity spectrum method
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 sim-plified 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 divid-ed into five grades using control indexes.A corresponding quantitative evaluation model was con-structed.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 perform-ance 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 distribu-tion,the relative error of horizontal displacement at the top point of the transmission tower ob-tained 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.
万方数据
维普
