Large-span combined arch bridge based on bending pressure design theory and design and construction method thereof

Abstract

The invention discloses a large-span combined arch bridge based on a bending pressure design theory and a design and construction method thereof. The arch bridge comprises an arch springing section capable of bearing the action of tension or pressure and an arch web-arch crown section of an open web structure. The arch axis part of the arch foot section is a convergent composite curve; the curvature is changed, the arch foot section is rigidly connected with the arch web-arch crown section; the structure is continued, the tangent slopes of connecting points between the two are consistent, thecurvature of the arch foot section is gradually increased to be close to 90 degrees, only vertical component force exists, the horizontal component force is close to 0, the horizontal thrust of the main arch is reduced by 30%-64%, and the transverse stability is improved by 35%-55%; and horizontal tie bars required for overcoming horizontal thrust are reduced or canceled, so that the manufacturingcost is saved, the mechanical advantage that the composite structure material can be pressed and can be tensile and the economic spanning capacity of the large-span arch bridge can be fully exerted,and the section efficiency is improved.

Description

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

AI Technical Summary

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

Images