R.C.框架结构的振动台试验和面向设计的时程分析方法

钢筋混凝土框架结构的弹塑性时程反应分析是抗震设计规范所要求的一项重要内容,但目前还滑有比较简单实用肯计算可靠的方法。本文进行了两个六层钢筋混凝土框架结构模型的地震模拟震动台试验,通过分析试验模型的自振特性、变形形式、加速度反应、位移反应和破坏开矿以及钢筋混凝土框架结构的实际震害,建立了面向设计的钢筋混凝土框架结构弹塑性里程反应分析的计算方法。在这一方法中,对钢筋混凝土框架整体结构采用层间剪切模型,

SHAKING TABLE TESTS OF R.C. FRAMES AND DEVELOPMENT OF DESIGN-ORIENTED TIME HISTORY ANALYSIS METHOD

In order to study the seismic behavio r and nonlinear time history analysis raethod for reinfbrced ooncrete Dazne structures, shaking table tests of two six - story reinforced con- crete frame models were carried out at Tongji Univenity recently and the test results are introduced in this paper. By analyzing the dynamic characteristics, deformation patterns, seismic rcsponses of acceleration and displacement, and the failure mechanism of the test models, the nonlinear time history analysis method for this kind of structures is devel- oped in which " a shear type model" is used as the dynamdc analytical model for the whole structure and "a semidegrading trilinear model with a desoending branch " is selected as restocjng force model for the interstory columns , The methctd for determining the parameters of the restoring lbrce model is also given in this paper. Comparison be- tween analytical results and the results of shaking table tests shows that the calculated time histories of the two frame models are agreeable to the tested ones. From the practi- cal points of view, the analytical method developed in this paper is simple and reliable, and it can provide a powerful tool for engineering design.