三岔主梁下承式系杆拱桥结构方案和受力性能研究

Research on the Structural Scheme and Mechanical Performance of a Through Tied Arch Bridge with Three Branched Main Beams

下承式系杆拱桥是一种受力性能优越的桥型。现吸取下承式系杆拱桥“自平衡”的结构特点,创新性地提出了一种可适用于三岔河口等特殊建设条件的、主梁呈Y形分岔的下承式系杆拱桥,并分析了该桥型的传力机理,介绍了采用该桥型的某桥设计方案。同时,对三岔主梁下承式系杆拱桥和常规下承式系杆拱桥的受力特点进行了对比分析,总结了三岔主梁下承式系杆拱桥的受力特点,为类似建设条件下的桥梁设计提供了有益参考。

The through tied arch bridge is a type of bridge with superior mechanical performance.This article draws on the structural characteristics of the"self balancing"through tied arch bridge and innovatively proposes a through tied arch bridge with Y-shaped bifurcations that can be applied to special construction conditions such as the Three-Branched River mouth.It analyzes the force transmission mechanism of this bridge type and introduces a design scheme for a certain bridge using this bridge type.At the same time,this article compares and analyzes the stress characteristics of the three-branch main beam through tied arch bridge and the conventional through tied arch bridge,summarizes the stress characteristics of the three-branch main beam through tied arch bridge,and provides useful reference for bridge design under similar construction conditions.