Long-span composite arch bridge and its design and construction method based on bending-compression design theory

Abstract

The invention discloses a large-span composite arch bridge based on bending-compression design theory and its design and construction method. The arch axis part is a convergent compound curve, and its curvature changes. The arch foot section is rigidly connected with the soffit-vault section, and the structure is continuous. The slope of the tangent line at the connection point between the two is consistent, and the curvature of the arch foot section gradually increases. Until it is close to 90 degrees, there is only vertical component force, and horizontal component force is close to 0, which reduces the horizontal thrust of the main arch by 30% to 64%, improves the lateral stability by 35% to 55%, and reduces or cancels the overcoming level The horizontal tie rods required for thrust can save costs, and can give full play to the mechanical advantages of composite structural materials that can withstand both compression and tension and the economical spanning capacity of long-span arch bridges, improving the cross-sectional efficiency.

Description

technical field [0001] The invention relates to the field of long-span bridges and building structures, in particular to a long-span composite arch bridge based on bending-compression design theory and a design and construction method. Background technique [0002] my country is an ancient arch bridge kingdom. Arch bridge is one of the main bridge types of long-span bridges in my country. At the same time, as an ancient bridge type, it has unique technologies such as large spanning capacity, high bearing capacity, flexible available materials, economical cost, low maintenance and repair costs, and beautiful appearance. It has become a bridge with the longest architectural history and strong competitiveness because of its advantages, and it is always prosperous. [0003] Such as figure 1 The arch bridges shown are generally built in areas with good foundations. The construction of arch bridges in plain areas or areas with soft soil foundations is cumbersome, with a large amo...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a long-span composite arch bridge based on bending-compression design theory, aiming to solve the problem that traditional arch bridges in the prior art generally use stone or concrete construction materials, which are compressive but not tensile, and the arch axis is arranged along the pressure line. , the horizontal component force of the arch foot is large, resulting in a large compressive stress on the vault section, and the arch section size required for the lateral stability of the arch increases, resulting in an increase in material and self-weight, and the number of horizontal tie rods and cable adjustments also increases accordingly. The high cost reduces the technical problem of the economical spanning ability of long-span arch bridges; it also solves the problem that although modern composite arch bridges use new steel-concrete composite structural materials, most of them still use the traditional arch axis and still use the axial compression design theory, which has not been able to give full play The composite structural material has the mechanical advantage of being able to withstand both compression and tension, the horizontal thrust of the arch foot has not been effectively reduced, the section of the main arch is not very economical, and there is no technical problem that can fully improve the economical spanning capacity of the long-span arch bridge

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