双箱型空腹圆弧钢拱平面内稳定性分析  

In-plane stability analysis of double-box open-spandrel circular steel arches

作　　者：刘学杰 袁波[1,2] 卢超杰 郑勇 LIU Xuejie;YUAN Bo;LU Chaojie;ZHENG Yong(Space Structure Research Center,Guizhou University,Guiyang 550025,China;Guizhou Key Laboratory for Structure Engineering(Guizhou University),Guiyang 550025,China)

机构地区：[1]贵州大学空间结构研究中心,贵阳550025 [2]贵州省结构工程重点实验室(贵州大学),贵阳550025

出　　处：《哈尔滨工业大学学报》2022年第5期131-139,共9页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51168010)。

摘　　要：为研究新型双箱型空腹圆弧钢拱的平面内稳定特性,采用理论推导与有限元数值模拟相结合的方法,研究其平面内弹性屈曲及弹塑性稳定承载力,分析剪力对拱截面破坏模式的影响,并建立了平面内稳定承载力的设计方法。首先,根据拱截面的剪力分布情况,研究了双箱型空腹圆弧钢拱截面整体剪切变形及弦腹杆剪切变形对平面内弹性屈曲的影响;推导出了考虑双剪切变形影响时,双箱型空腹圆弧钢拱的纯压弹性屈曲荷载公式。然后,参考轴心受压柱设计原理,引入稳定系数及正则化长细比,绘制了纯压状态下的稳定曲线。最后,分析了在几种常见荷载工况下,双箱型空腹圆弧钢拱整体破坏模式的稳定承载力设计公式。本文分析的拱结构新颖,所提弹性屈曲荷载公式计算结果与有限元分析结果十分吻合,同时采用轴力与弯矩的二项式验算了整体稳定承载能力。研究结果可供日后科研和实际工程设计参考,具有一定的现实意义。To understand the in-plane stability of a new type of double-box open-spandrel circular steel arch,the in-plane elastic buckling and elastic-plastic stable bearing capacity of the steel arch were investigated by theoretical deduction combined with finite element numerical simulation,the influence of shear force on the failure modes of arch section was analyzed,and the design method for the in-plane stable bearing capacity of the steel arch was proposed.First,according to the distribution of shear force on the arch section,the influence of shear deformation of double-box open-spandrel circular steel arch and local shear deformation of chord web on the in-plane elastic buckling was studied.The formula of pure compressive elastic buckling load of double-box open-spandrel circular steel arch was derived considering double shear.Then,based on the design principle of axially compressed column of steel structure,stability coefficient and regularized slenderness ratio were introduced to draw the stability curves under pure pressure.Finally,the stable bearing capacity design formulas of the integral failure mode of double-box open-spandrel circular steel arch under several common load conditions were analyzed.The arch structure analyzed in this paper is novel,and the calculated results of the proposed elastic buckling load formula were in good agreement with the finite element analysis results.At the same time,the binomial formula of axial force and bending moment was used to check the overall stable bearing capacity.The results can be used as a reference for future scientific research and practical engineering design,which has important practical significance.

关 键 词：双箱型空腹圆弧钢拱 弹性屈曲 弹塑性稳定 稳定曲线 承载力 

分 类 号：TU391[建筑科学—结构工程]