A design calculation method for steel-concrete joints of hybrid girder bridges

Abstract

The invention discloses a design calculation method for a steel-concrete joint of a hybrid girder bridge, and relates to the field of bridge design of a hybrid girder bridge. The method includes the following steps: setting the local prestress of the steel-concrete joint; selecting a typical force-transmitting element as an analysis and design object; calculating the axial force of the typical force-transmitting element; The thickness of the bearing plate; check whether the thickness of the bearing plate is qualified; when it is necessary to add a bearing-shear-type steel-concrete joint; initially set the pressure-bearing shear-type steel-concrete joint to transmit the internal force through the shear key as a typical force transmission 30% of the axial force of the element; arrange shear keys on the extension of the steel structure according to the calculation formula; check whether the shear keys are qualified according to the formula. The invention can design a suitable steel-concrete joint by calculation formula, not only does not need test cost and test period, but also is convenient to apply, which is beneficial to the popularization and application of hybrid girder bridges in urban bridges.

Description

Technical field [0001] The invention relates to the field of bridge design of hybrid beam bridges (steel structure and concrete structure hybrid bridges), in particular to a design calculation method for steel-concrete joints of hybrid beam bridges. Background technique [0002] Hybrid beam bridge (steel structure and concrete structure hybrid bridge) is a bridge that uses steel and reinforced concrete members in different sections of the main girder. The mechanical performance, spanning capacity and economic efficiency of the hybrid beam bridge are good. When the mixed beam bridge is applied to the continuous beam and rigid frame system of small and medium spans, in addition to increasing the span, the construction superiority is more prominent. The steel structure mid-span can be quickly hoisted to complete the bridge closure, which can not only significantly alleviate the traffic congestion caused by the bridge construction in the city Problems, and can achieve good social ben...

AI Technical Summary

Problems solved by technology

[0005] The scale model test not only has high test cost and a long test period, but also has a long lag time for the feedback effect of the scale model test on the design of the steel-concrete joint, which leads to the increasingly conservative and complicated design of the steel-concrete joint

For small and medium-span hybrid girder bridges, due to the limitation of investment scale, when unconditional tests are carried out, small and medium-span hybrid girder bridges tend to use the steel-concrete joint construction form of long-span hybrid The structure of the bridge part is relatively complicated, which makes the structure of the medium and small-span hybrid girder bridges using the steel-concrete joint part too complicated, which is not conducive to the promotion and application of hybrid girder bridges in urban bridges

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