新型索-拱结构的平面内弹性稳定性能研究  

In-plane Elastic Stability Performance of a New Cable-arch Structure

作　　者：徐春丽 

机构地区：[1]上海宝冶集团有限公司,上海200941

出　　处：《结构工程师》2016年第2期53-59,共7页Structural Engineers

摘　　要：所研究的索-拱结构,是在圆弧形拱轴线上,按照拱平面投影n等分处设置放射状索,以改善拱轴线上不均匀弯矩分布,达到提高纯拱结构稳定极限承载力的目的。利用牛顿-拉普森法和弧长法对这种索-拱结构在全跨均布荷载和全跨恒载+半跨活载作用下进行了完善和带缺陷结构的弹性大挠度跟踪分析,研究了索对两种荷载形式下结构的极限荷载和平衡路径的影响;提出的索-拱结构能显著地提高拱的极限承载能力并能有效地防止结构二次分岔失稳的发生,计算结果对索-拱的设计有参考价值。A new type cable-arch is introduced in this paper. The tensile cables in the arch are arranged according to the n equal division of arch＇ s planar projection to improve the uneven bending moment distribution along the axis of the arch and enhance ultimate load-bearing capacity of the pure arch. A whole load-displacement equilibrium path was obtained by using the large defection finite element approach in conjunction with the Newton-Raphson and arc-length Method. It is found that the cables affect significantly the structure behavior, including its load-carrying capacity and its load-displacement paths. The cable-arch structure can markedly enhance its load-bearing capacity and prevent the arch from the secondary bifurcation buckling. Some useful conclusions for the design of the cable-arch are drawn from the numerical results obtained in the study.

关 键 词：索-拱结构 平面内弹性稳定 极限承载能力 二次分岔屈曲 

分 类 号：TU399[建筑科学—结构工程]