Strain rate effect on transmission tower-line system under earthquake action作者: Wang wenming,Li Hongnan,Liu-Guohuan,Tian Li |
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Abstract:Abstract. Using ABAQUS software, three dimensional finite element model of a transmission tower-line system is created. Nonlinear seismic responses under three seismic records with and without strain rate effect are studied. The results show that the strain rate effect on the transmission tower-line system is more obvious with an increase in intensity of the earthquake. The influence of strain rate on the top displacement and base shear of tower under certain seismic records is unneglectable. Also, it is shown that the strain rate effect on the deformation of wire is prominent. The strain rate effect on the axial force of wire is neglectable. This simple study reveals theimportance of considering strain rate effect in seismic analysis for transmission tower-line system. Keywords:transmission tower-line system, nonlinear time-history analysis, strain rate effect, earthquake. Introduction
Most materials used in civil engineering are sensitive to strain rate. At different strain rate, the mechanical properties of steel including strength, stiffness and ductility are different [1-4]. Therefore, strain rate effect should be considered in seismic analysis. Electric transmission line is lifeline system whose damage can cause great economiclose and bring certain social influence because of its special functions [5]. In the past decades, the study concentrated on static analysismode analysis and dynamic time-history analysis without considering material nonlinearity [5-7]. Under catastrophic earthquakes, transmission tower-line system might be damaged, and then it is necessary to consider material nonlinearity. The strain rate effect on transmission tower-line system is studied by nonlinear time-history analysis of a model using
ABAQUS in this paper.
Conclusions In this paper, a fast stochastic analysis method of soil-structure interaction system has been presented. In the new method, the pseudo-excitation method and the classical modal decomposition is adopted to derivate an iterative sequence, which can exactly account for the non-proportional damping and dynamic interaction between the soil region and the structure without obviously increasing computational effort. Furthermore,the new method’s accuracy and convergence have been proved by some numerical examples belonging to two different models of soil-structure interaction system. References: [1] Seed, H.B., Hwang, R.N., Lysmer, J. (1975) “Soil-Structure Interaction Analyses for Seismic Response,” Journal of the Geotechnical Engineering Division, 101(5): 439-457. [2] Veletsos, A.S., Prasad, A.M. (1989) “Seismic interaction of structures and soils:stochastic approach,” Journal of Structural Engineering, 115(4): 935-956. [3] Zhang, X., Wegner, J.L., Haddow, J.B. 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