少筋混凝土剪力墙结构抗侧力破损试验的计算机模拟方法

The Computer Modelling Analysis Simulating the Destructive Test of Less-reinforced Concrete Shear-wall Structure

本文是将过去仅用于弹性结构计算的连续化分析法,推广应用于弹-塑性结构计算,用以利用计算机模拟结构试验,计算出结构破坏过程,并为提高计算精度,对首层采用原型(非连续化)分析。本文方法与现有的离散化有限元法相比,具有输入数据简单,运算速度快,大大节省计算机内存与机时的优点。本文方法的要点在于采用连续化分析的同时,辅以结构已局部破损部位的刚度退化修改,再进行按同一竖列内部变形能量等效的再度刚度连续化,进入下一级荷载下的分析,并在求得整体变形后,还原到非连续化的实际刚度,进行各部位的内力分配计算,求出新一轮的破损位置。如此步步计算,直到最后阶段。

This paper provides a computer modelling method Simulating a destructive test of 0.5-scale 4-storeyed building for calculating the elasto-plastic shear-wall structures by using the "continuum approach" model as its mathematical model of analysis which in the past could only be used for elastic structures.Besides,in order to have better result of analysis, the first storey of the analyzed building is kept in its prototype without using the continuum approach model. The main points of this method is to employ the equivalant continuous medium replacing the connecting beams between those coupled walls associated with the equivalent constant stiffness of all components (beams or walls) which are located at the same vertical row.This equivalent constant stiffness is used to replace the real stiffness of different components.The variety of real stiffness at the same row is caused by the fact that some components have already been destroyed (or have yielded)under loads while some of them are still kept within the elastic range.Here, the equivalent constant stiffness is counted in accordance with the equivalence of the def ormational energy stored up at the same vertical row.After knowing the general deformation of the whole structure the internal stresses of different components will be distributed according to their real stiffness and then the new lots of destruction will be determined and used for another round of loading.