自锚式悬索桥主缆成桥线形分析的等代梁法  

Equivalent Beam Method for Finished Cable Curve of Self-anchored Suspension Bridges

作　　者：屈计划[1] 唐国喜[1] 郑国华[1] 

机构地区：[1]安徽省交通规划设计研究院,安徽合肥230088

出　　处：《交通科技与经济》2011年第2期74-77,共4页Technology & Economy in Areas of Communications

摘　　要：主缆是自锚式悬索桥结构中的主要承重构件,主缆的成桥线形是进行结构设计、计算和指导施工的关键控制因素,建立符合实际情况的主缆成桥线形计算方法十分必要。采用等代梁法,根据力学平衡和变形相容条件,推导出了假设荷载沿跨径均布的抛物线法和假设荷载沿弧线均布的悬链线法的主缆成桥线形的解析表达式,并采用逐次逼近法计算出悬链线法主缆内力水平分量和成桥线形,同时建立非线性有限元分析模型并通过迭代计算确定主缆线形的数值解并与该方法进行对比分析,结果表明,该方法简单易行,精确度高,能满足工程需要。The cable is the main supporting component in the self-anchored suspension bridge.Its shape in the bridge＇scompletion state is the key controlling factor of structure design,calculation and guiding construction.it is necessary to establish the cable shape＇s computation method complying with the actually situation.Based one the theory of mechanical equalibrium and deformation compatibility,two methods were derivated using the equivalent beam method,the parabola method of cable load distributing uniformly along the span and the catenary method of load distributing equally along the curve.After that,the finished cable curve and the horizontal component rally of the cable is computed using the equivalent simple-supported beam method,the 3D nonlinear finite model is established to calculate the numerical solution of the cable and have a comparative analysis with the method of this paper.It＇s pointed that the method in this paper is straightofrward,high precision and can meet the engineering needs.

关 键 词：自锚悬索桥 成桥线形 抛物线法 悬链线法 等代梁法 逐次逼近法 

分 类 号：U448.217[建筑科学—桥梁与隧道工程]