非落地钢管桁架拱结构稳定性能

发布时间：2018-03-30 16:24

本文选题：非落地　切入点：钢管桁架拱结构　出处：《天津大学学报(自然科学与工程技术版)》2014年11期

【摘要】：由于使用空间的需要,钢管桁架拱多为非落地拱,支承于桁架柱或其他结构上.桁架柱或其他结构的刚度的变化,会直接影响钢管桁架拱的稳定性能.本文在考虑刚度等效原则的基础上,根据线弹性稳定理论,推导出非落地钢管桁架拱结构面内、外临界荷载表达式.根据面外失稳临界荷载值不小于面内失稳临界荷载值的原则,沿圆弧拱侧向等距离布置侧向支撑,以防止其发生面外失稳,进而确定出侧向支撑的布置数目.分析得出圆弧拱的半径对侧向支撑的数目没有影响;随着桁架拱的开角(矢跨比)、桁架拱截面高度的增大,侧向支撑的数目增多;随着桁架拱截面宽度的增大,侧向支撑的数目减少.最后得出侧向支撑数目与无量纲参数f/L、h/b的关系表达式.
[Abstract]:Due to the need of space, steel tube truss arch is mostly non-ground arch, which is supported on truss column or other structure. The stiffness change of truss column or other structure, The stability of steel tube truss arch is directly affected. Based on the principle of stiffness equivalence and the theory of linear elastic stability, the in-plane structure of non-landing steel tube truss arch is deduced in this paper. Expression of external critical load. According to the principle that the critical load value of out-of-plane instability is not less than that of in-plane unstable critical load, lateral braces are arranged along the lateral isometric direction of arc arch to prevent out-of-plane instability. The analysis shows that the radius of arc arch has no effect on the number of lateral braces, and the number of lateral braces increases with the increase of the opening angle of truss arch (rise-span ratio) and the height of cross-section of truss arch. With the increase of cross-section width of truss arch, the number of lateral braces decreases. Finally, the relationship between the number of lateral braces and dimensionless parameter f / L / h / b is obtained.
【作者单位】：天津大学建筑工程学院;滨海土木工程结构与安全教育部重点实验室(天津大学);
【基金】：国家自然科学基金资助项目(51178307,51308386) 教育部新世纪优秀人才支持计划资助项目(NCET10-0613)
【分类号】：TU391

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