钢管混凝土输电塔地震易损性研究OA北大核心CSTPCD

The interaction between concrete and steel tubes in concrete-filled steel tube(CFST)trans-mission towers makes their seismic vulnerability different from that in ordinary concrete transmission towers.To compare and study these differences,the article examined the interaction between steel tubes and core concrete from a material constitutive model perspective.It used finite element software OpenSees to establish a model for the CFST transmission tower and analyzed its structural response.Incremental dynamic analysis was then applied to delineate vulnerability curves under various condi-tions,including frequent,design basis,rare,and extremely rare earthquakes.Furthermore,the quan-titative influence of the first cycle spectral acceleration on the failure probability of CFST transmission towers was assessed.The results of seismic vulnerability were compared with those of ordinary trans-mission towers.Findings indicated that CFST transmission towers were less vulnerable to severe damage or collapse under the actions of frequent,design basis,rare,and extremely rare earthquakes.The first cycle spectral accelerations were mostly between 1.0g～1.4g.With the increase in earthquake intensity,the seismic performance of CFST transmission towers became worse than that of ordinary transmission towers.