拱索体系加固的刚架拱桥荷载横向分布

针对传统的钢筋混凝土刚架拱桥采用拱索体系加固的要点和措施,提出了计算拱索体系荷载横向分布的弹性支承连续梁法。该方法假定荷载作用在由各拱片或索组成的空间桥梁结构中,通过计算荷载作用在截面处各拱片或索的刚度,根据桥梁的横向联结刚度,建立一弹性支承连续横梁来计算荷载在各拱片的横向分配,从而把空间问题转化为平面问题来处理。空间有限元分析结果和实桥试验结果对比表明:用拱索体系加固刚架拱桥,能有效地提高该桥的极限承载能力;该方法是一种简单、实用、偏于安全的设计计算方法。

Load Lateral Distribution of Rigid Frame Arch Bridge Strengthened with Arch and Stayed Cable System

Aimed at outline and measures for strengthening the traditional reinforced concrete rigid frame arch bridge with arch and stayed cable system,an elastic supported continuous beam method for calculating load lateral distribution of arch and stayed cable system was put forward.In other word,assuming that load effect exists in bridge spatial structure composed of arch rib and stayed cable through calculation of arch and stayed cable stiffness at section under the load effect and bridge transverse jointed stiffness,an elastic supported continuous transverse beam was established for calculating load lateral allocation at arch.Thus,the spatial calculating problem was simplified as the plane calculating problem.Results comparisons between spatial finite element analysis and the field bridge test show that the reinforced concrete rigid frame arch bridge strengthened with arch and stayed cable system can effectively enhance the ultimate bearing capacity of the bridge;the method is simple and practical and it is partial to safety.