Study on ground motion intensity measure and structural damage measure of transmission tower based on IDA
Utilizing 20 typical ground time histories,the study employs 10 ground motion intensity measures and 4 structural damage measures to perform incremental dynamic analysis(IDA)on transmission towers.A dimension-less model of relevance between ground intensity measures and transmission damage measures is established by log-log linear regression.Based on this model,the efficiency,practicality,and proficiency of each IM-DM combination are evaluated and compared comprehensively.The results show that,as to transmission towers structures,the combination of selecting effective peak acceleration(EPA)as the IM and inter-story drift ration(ISDR)as the DM has better stability and higher relevance.The advantages of Sa∗avg based on the first and second order response spectra of transmission tower structures in relevance evaluation is similar to EPA and Sa(T1),while the Sv∗avg measure enhances the relevance with DMs compared to the effective peak velocity(EPV)and first cycle spectral velocity(Sv(T1))measures.When the E(ad)measure representing the input of seismic energy into the structure is combined with all IMs,it is not affected by the fact that the transmission tower is more sensitive to acceleration type IMs,resulting in a stronger correlation between acceleration type IMs and DMs combinations.This research provides a reference for further improving the accuracy of seismic performance evaluation for transmission tower structures.
IDA analysisground motion intensity measurestructural damage measuretransmission tower structurecomprehensive evaluation
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