不同支座约束下网架结构的动力特性对比  

Comparative study on dynamic performance of latticed truss with different bearings

作　　者：柳春光[1,2] 李会军[2] 林桂枫 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]大连理工大学土木水利学院,辽宁大连116024 [3]中铁十三局一公司大连分公司,辽宁大连116033

出　　处：《辽宁工程技术大学学报（自然科学版）》2009年第5期746-749,共4页Journal of Liaoning Technical University (Natural Science)

基　　金：国家自然科学基金资助项目(59908013)

摘　　要：为了论证网架在设计时应与下部结构进行整体计算的必要性,以三种支撑下(刚铰支座、弹性支座和柱子支撑)的双层正放四角锥矩形网架为研究对象,应用ANSYS对多个网架结构的挠度、压杆、拉杆进行对比研究,得出如下结论:刚铰支座与弹性支座、整体分析网架的杆件动静力分布规律截然不同,必须考虑下部结构刚度对网架杆件受力的影响,不可简单地简化为刚铰支座,否则设计极不安全;以弹性支座网架模型代替整体分析网架模型有一定的可行性,二者在内力分布及大小较相近,但也有不少杆件应力偏差较大。To demonstrate the necessity of integrated analysis,a study was conducted on double-layer pyramid latticed trusses with three different supports（rigid hinged supports,elastic supports and pillar supports）.Deformation,compressive and tensile bars of trusses with three different supports was compared using ANSYS.The comparison showed that the stress distribution and the magnitude of rigid hinged truss are totally different from that of elastic and pillar supports.Hence the effect of substructure’ stiffness on truss must be considered,and substructure cannot be simplified as hinged supports in truss design,otherwise it is unsafe.Also,it is feasible to substitute elastic bearing for whole model analysis because the distribution and magnitude of their stress are similar.However,there are still some large stress deviations in few bars.

关 键 词：网架 整体模型分析 弹性支座 阻尼比 橡胶支座 刚度 

分 类 号：TU318[建筑科学—结构工程]