基于有限元的分层空间桁架法计算精度分析  

Calculation Accuracy Analysis of Layered Space Truss Method Based on Finite Element Method

作　　者：夏大桥[1,2] 尹昊[3] 王建磊[3] 王谦[3] 赵海龙[2] 

机构地区：[1]西安理工大学,710048 [2]中广电广播电影电视设计研究院,北京100045 [3]清华大学土木工程系,土木工程安全与耐久教育部重点实验室,北京100084

出　　处：《特种结构》2014年第4期48-52,共5页Special Structures

摘　　要：通过分析分层空间桁架法与有限元法之间的计算差别来讨论分层空间桁架法的计算精度;对某电视塔分别用分层空间桁架法及有限元法在相同荷载条件下进行计算,认为有限元方法为精确解,并以此来分析分层空间桁架法的计算结果。分析结果如下:分层空间桁架法在结构截面形状及截面尺寸没有突变时误差较小,内力及位移计算误差基本可以控制在20%以内,内力较小的斜撑计算误差较大,但不影响设计,截面形状及截面尺寸发生突变时斜撑内力及层间侧移计算误差可达50%以上,此时分层空间桁架法不适用;在上下分布较为均匀的实际结构中,分层空间桁架法误差较小,可以用于结构初步设计以及与有限元计算结果相互校核。In order to study the accuracy of layered space truss method, this paper analyzed the difference of calculation results between layered space truss method and finite element method,＂ A television tower was studied with layered space truss method and finite element method under the same loading conditions, by assuming the finite element result to be accurate, the deviation of layered space truss method was studied. The deviations of the results of layered space truss method can be within 20% when the sections of tower change gradually, but the deviations couM be over 50% when the sections of tower change when the internal force is small which with no effect on design, and it does not applicable to be used in engineering design,＂ The layered space truss method becomes accurate enough when the structure arranges uniformly, and it＇s applicable to steel tower preliminary desien and to check the results of linite element method.

关 键 词：电视塔结构 分层空间桁架法 静力计算 精度分析 

分 类 号：TU323.4[建筑科学—结构工程]