Design and calculation method for reinforced concrete combined part of mixed girder bridge

Abstract

The invention discloses a design and calculation method for a reinforced concrete combined part of a mixed girder bridge and relates to the field of bridge design of the mixed girder bridge. The method comprises the steps that the partial prestress of the reinforced concrete combined part is set; a typical force transferring unit is selected as an analyzing designing object; the axial force of the reinforced concrete combined part is computed; according to the thickness and the prestress of a steel plate connected with a bearing plate, the thickness of the bearing plate is designed in advance; whether the thickness of the bearing plate is qualified is checked; when the bearing shearing transferring type reinforced concrete combined part needs to be added, the inner force transferred through a shear key of the bearing shearing transferring type reinforced concrete combined part is initially set to be 30% of the axial force of the typical force transferring unit; the shear key is arranged on a steel structure extending section according to a computing formula; and whether the shear key is qualified is checked according to the formula. The proper reinforced concrete combined part can be designed according to the computing formula, test cost is of no need, the test cycle is avoided, application is convenient, and promotion and application of the mixed girder bridge in city bridges can be well achieved.

Description

technical field [0001] The invention relates to the field of bridge design of mixed girder bridges (mixed steel structure and concrete structure bridges), in particular to a design calculation method for steel-concrete joints of mixed girder bridges. Background technique [0002] Hybrid girder bridge (steel structure and concrete structure hybrid bridge) is a bridge in which steel and reinforced concrete components are used in different sections of the main girder. The mechanical performance, spanning capacity and economy of the hybrid girder bridge are all good. When the hybrid girder bridge is applied to the continuous beam and rigid frame system of small and medium spans, in addition to increasing the span, the construction advantages are more prominent. The middle span of the steel structure can be quickly hoisted to complete the bridge closure, which can not only significantly alleviate the traffic congestion caused by bridge construction in the city problems, and can a...

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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