砂砾石垫层对上部结构动力特性的影响分析

【作者】 邹颖娴； 王社良； 吕刚；

【机构】 西安建筑科技大学土木工程学院；

【摘要】 本文采用有限元方法研究砂砾石垫层对上部结构动力特性的影响。对同一钢筋混凝土框架结构建立两个有限元计算模型,一个采用刚性地基假定,一个根据共同工作原理考虑砂砾石垫层与上部结构的共同工作,分别用子空间迭代法对两个有限元计算模型进行模态分析,计算结果表明:结构体系中考虑砂砾石垫层与上部结构的共同工作后,结构的周期增长,固有频率降低,这说明砂砾石垫层可以增大体系柔度,有利于减小上部结构的加速度反应,因此在砂砾石垫层上选择刚度较大的结构形式是有利于抗震的。更多还原

【Abstract】 This paper discusses the impact that sand gravel underlayer may make on the constructions on it.It made 2 computational models in finite element method,one with the rigid-foundation assumption,the other is made considering the cooperation between the groundsill and the constructions on it.Then compute the modes of the 2 models in the way of subspace-iteration. From the results,we found that the natural cycles of construction are prolonged,and the natural frequencies are reduced,which means that the structural system turned to be more flexible when sand gravel underlayer is introduced into its computational model.The results also tells us that it can help increase the aseismatic performance of structural when we choose rigid structural styles on the sand gravel underlayer.更多还原