ترجمه مقاله نقش ضروری ارتباطات 6G با چشم انداز صنعت 4.0
- مبلغ: ۸۶,۰۰۰ تومان
ترجمه مقاله پایداری توسعه شهری، تعدیل ساختار صنعتی و کارایی کاربری زمین
- مبلغ: ۹۱,۰۰۰ تومان
The paper focusses on seismic damage analysis of reinforced concrete (R/C) members, accounting for shear–flexure interaction in the inelastic range. A finite element of the beam-column type recently proposed by the writers for the seismic analysis of R/C structures is first briefly described. The analytical model consists of two distributed flexibility sub-elements which interact throughout the analysis to simulate inelastic flexural and shear response. The finite element accounts for shear strength degradation with inelastic curvature demand, as well as coupling between inelastic flexural and shear deformations after flexural yielding. Based on this model, a seismic damage index is proposed taking into account both inelastic flexural and shear deformations, as well as their interaction. The finite element and the seismic damage index are used to analyse the response of R/C columns tested under cyclic loading and failing either in shear or in flexure. It is shown that the analytical model and damage index can predict and describe well the hysteretic response of R/C columns with different types of failure.
1 Introduction
The vast majority of existing R/C structures has not been designed according to modern seismic codes. These structures are very likely to experience brittle types of shear failure with grave consequences during a major seismic event. Therefore, a complete and reliable seismic assessment of these structures should account for inelastic shear effects. The first step to perform a realistic seismic damage analysis is to develop an analytical model which is able to predict accurately nonlinear structural behaviour during a seismic event. Explicit modelling of inelastic shear may play a key role in this respect, especially in the case of gravity load designed (GLD) frame structures.
5 Conclusions
A distributed shear and flexural flexibility model with shear–flexure interaction for seismic assessment of R/C structures has been developed. The model is able of capturing shear strength degradation as well as increase of inelastic shear deformations subsequent to flexural yielding. Based on this finite element model a combined damage index is proposed for the seismic damage analysis of R/C structures. This damage index accounts for both inelastic flexural and shear deformations as well as their interaction.