THE CREEP EFFECTS ON THE BUCKLING OF SHALLOW SHELLS

An analysis of the creep effects on the buckling of concreteshallow shells is presented in this paper.Based on the non-linear theory of thin elastic shells.it is found that forthose of the elliptical paraboloidal type.the upper cri-tical load of the load-deflection curve will decrease whilethe lower limit Will increase with time.As to the problemof local buckling of the shell.the critical load is de-pendent only upon the modulus of elasticity at the instantit occurs.     

Seismic responses for multi-storeyed buildings composed of nonorthogonal members under bi-directional horizontal earthouake ground motions

This paper presents a method for analyzing both linear and nonlinear seismic responses of multistoreyed buildings composed of nonorthogonal structural members under the action of bi-directional horizontal earthquake waves. Different kinds of restoring force model are used. An efficient computer programme for the computation of nonlinear seismic response of the structure was worked out. In order to illustrate the application of this method, an example of a ten-storeyed building of such sort is given.     

SEISMIC RESPONSES FOR MULTI-STOREYED BUILDINGS COMPOSED OF NONORTHOGONAL MEMBERS UNDER BI-DIRECTIONAL HORIZONTAL EARTHOUAKE GROUND MOTIONS

This paper presents a method for analyzing bothlinear and nonlinear seismic responses of multi-storeyed buildings composed of nonorthogonal struc-tural members under the action of bi-directional ho-rizontal earthquake waves. Different kinds of re-storing force model are used. An efficient computerprogramme for the computation of nonlinear seismicresponse of the structure was worked out. In order toillustrate the application of this method,an exampleof a ten-storeyed building of such sort is given.     

扁壳压曲的蠕变效应

本文讨论了混凝土扁壳压曲的蠕变效应.基于弹性薄壳的非线性理论,发现椭圆抛物面扁壳,其荷载-挠度曲线的上临界荷载将随时间而降低,而下临界荷载则随时间而上升.至于扁壳的局部失稳问题,其临界荷载仅取决于压曲发生瞬间材料的弹性模量.     

二维水平地震作用下斜交构件多层结构的地震反应

本文针对由斜交构件组成的多层结构,考虑任意角度输入二维水平地运动,采用多种不同的恢复力特性曲线模型,提供了弹性与弹塑性地震反应的计算方法,并据此编制了相应的计算机程序.文内通过一座十层建筑结构的算例,分析了一维与二维地震波输入以及不同的地震波输入角度对各构件地震反应的影响,并讨论了弹性与弹塑性地震反应的差异,提出了一些有参考价值的结论.