Research On Bearing Capacity And Seismic Response Analysis Of UHV Transmission Towers

Transmission towers play an important role in the power transmission system.With the increasing demand for electricity in recent years,the load on the tower is also increasing,and the requirement for the bearing capacity of the tower pedestal is becoming higher and higher.At present,four-foot bolted tower pedestal is commonly used in engineering,and eight-foot bolted tower pedestal is more and more widely used because of its higher load-carrying capacity.However,the calculation of the bearing capacity of the tray in the existing codes in our country is too conservative,which is prone to waste,and the relevant theory is also relatively imperfect.In view of this phenomenon,the bearing capacity of UHV transmission tower pedestal plate is further studied,and its displacement response under earthquake is preliminarily explored,including the following aspects:(1)A full-scale test of 26 members was carried out on the typical tower seat plate in the project.Among them,there were 10 four-pin bolt tower seat plates and 16eight-foot bolt tower seat plates.The damage form of the tower seat plate was analyzed.And the influence of each parameter on the bearing capacity of the tower seat plate,and the method for determining the bearing capacity is clarified;(2)The numerical analysis of the tower plate was carried out by ANSYS finite element software.The calculation results of some components were listed and compared with the test.The adaptability of the model was verified.The finite element results were in good agreement with the test results.Modeling for large-scale numerical calculations;(3))Based on the numerical values obtained from the test,combined with theresults of the finite element analysis,using the yield line method and the reference domestic relevant specifications,the four-foot bolt tower seat plate and the eight-foot bolt tower seat plate are proposed under the tensile load.The calculation method of bearing capacity is recommended,and compared with the test and finite element results,which has certain reference to engineering design;(4)The whole tower model of the transmission tower was established.The dynamic time history analysis method was used to analyze the seismic response time history of the whole tower.Under the action of El-centro wave and Lanzhou wave,the stress and displacement response of the tower plate were studied.,obtained some seismic performance of the tower plate under seismic load.