等效刚度板模拟网架对下部支承结构的影响分析

采用拟夹层板分析法的相关假设和理论,利用等效刚度板对网架结构进行等效代换,研究等效刚度板模拟空间网架对下部支承结构的影响。通过建立网架结构模型和等效刚度板模型,运用SAP2000有限元分析软件分别对两种模型的自振频率,静载作用下的柱轴力以及水平地震作用下的弯矩、位移进行对比分析。分析结果表明,结构的周期、内力计算结果比较相近,部分构件位移有较大误差。可以得出,网架结构平面内刚度无限大的假定对计算结果产生较大误差,以等效刚度板代替网架结构的协同工作可以简化下部支承结构设计与计算分析,在工程误差范围内有一定的可行性。

Effect Analysis of Truss on Lower Part of Supporting Structure by Using Equivalent Stiffness Slab

In the present paper,according to the related hypothesis and theory of equivalent sandwich plate method,the truss is equivalently exchanged by equivalent stiffness slab,and the effect of the truss on the lower part of supporting structure is analyzed by using the equivalent stiffness slab method.According to two analysis models,the natural frequences of two models,the column axial force under static loads,and the moment and displacement under horizontal earthquake action are contrasted and analyzed by using SAP2000.The results show that under certain circumstances,this equivalent stiffness slab is suitable for simulation,and some advisory opinions are given to the design of grid structures at last.