矢跨比和垂跨比对张弦立体桁架性能的影响分析  

Influences of rise-to-span ratio and sag-to-span ratio on the prestressed spatial truss string structure

作　　者：王秀丽[1] 刘永周[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《空间结构》2005年第1期35-39,共5页Spatial Structures

基　　金：甘肃省建设厅科技攻关项目(JK2003-02);兰州理工大学优秀青年教师资助计划.

摘　　要：本文简要介绍了张弦立体桁架结构特点和受力机理,利用ANSYS有限元程序对一个100m跨度的张弦立体桁架进行了受力分析,详细阐述了矢跨比和垂跨比对该结构变形性能、受力性能和用钢量的影响,给出了设计的建议矢跨比和垂跨比,为此类结构的设计提供了参考.计算表明,结构的矢跨比最好大于0.12,而垂跨比最好大于0.1,这时结构的受力和位移都在比较合理的范围内.但矢跨比和垂跨比对纵向位移和支座反力的影响不明显.The character and the mechanical performance of the prestressed spatial truss string structures are introduced in this paper. The analysis is conducted on a prestressed spatial truss string structure with a span of 100m by ANSYS program. The influences of the rise-to-span ratio and the sag-to-span ratio on the structure have been analyzed in this paper. The effect of the two parameters on the deformation, the internal force and the consumption of steel are studied in detail. The suggested rise-to-span ratio and sag-to-span ratio of design is given in the paper. The numerical results show that the better rise-to-span ratio is larger than 0.12 and the better sag-to-span ratio is larger than 0.1, and they both have little effect on the lateral displacement and the support reaction.

关 键 词：垂跨比 矢跨比 桁架 立体 ANSYS有限元程序 受力机理 结构特点 受力分析 变形性能 受力性能 支座反力 纵向位移 用钢量 计算表 类结构 设计 

分 类 号：TU323[建筑科学—结构工程] U448.222[建筑科学—桥梁与隧道工程]