不同支座约束下网架结构的动力特性对比
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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.
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.
引文
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[10]支旭东,范峰,沈世钊.单层球面网壳在地震下的响应特性与失效机理[J].世界地震工程,2007,23(4):88-94.
[2]姜学诗.钢结构房屋结构设计中常见问题分析[J].建筑结构,2003,33(6):3-5.
[3]曹资,张超,张毅刚,等.网壳屋盖与下部支承结构动力相互作用研究[J].空间结构,2001,7(2):19-26.
[4]中国建筑科学研究院.网架结构设计与施工规程JGJ7-91[S].北京:中国建筑工业出版社.1991.
[5]李星荣,魏才昂,丁峙崐,等.钢结构连接节点设计手册(第二版)[M].北京:中国建筑工业出版社,2005.
[6]殷志祥,张辉.空间网架结构边界约束对网架温度应力的影响[J].辽宁工程技术大学学报,2002,21(6):723-725.
[7]Shibata A,Sozen M A.Substitute structure method for seismic design in R.C.[J].Proc.ASCE.Journal of the Structural Division,1976,102(1):1-18.
[8]蓝天,张毅刚.大跨度屋盖结构抗震设计[M].北京:中国建筑工业出版社,2000.
[9]薛素铎,赵伟,李雄彦.摩擦摆支座在单层球面网壳结构中的隔震分析[J].世界地震工程,2007,23(2):41-45.
[10]支旭东,范峰,沈世钊.单层球面网壳在地震下的响应特性与失效机理[J].世界地震工程,2007,23(4):88-94.
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