Bearing reaction force detection method for I-shaped steel-concrete composite beam

Abstract

The invention particularly relates to a bearing reaction force detection method for an I-shaped steel-concrete composite beam. The composite beam comprises a steel girder, a concrete deck slab, and shear studs, wherein the steel girder comprises two I-shaped girders, mid-span small crossbeams, supporting point large crossbeams, and cantilever arm crossbeams; and the steel girder is integrated withthe concrete deck slab through the shear studs, so that a composite structure is formed. The bearing reaction force detection method is characterized in that an oil jack and a displacement meter arearranged in the position of each supporting point of the I-shaped steel-concrete composite beam; and the jacks simultaneously carry out jacking to reach a certain height, complete disengagement of allsupporting seats of the entire steel girder is ensured, and the bearing reaction force of each jack is measured in a static status. The method has the advantages that through the conventional instruments and equipment such as the jacks and the displacement meters, as well as simple technical measures, the bearing reaction force of the I-shaped steel-concrete composite beam can be precisely measured, so that technical guarantees can be provided for subsequent bearing reaction force correction and secondary stress adjustment.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a method for detecting the support reaction force of an I-shaped steel-concrete composite beam. Background technique [0002] The concept of "composite beams" formed by the joint action of reinforced concrete bridge decks and steel beams through shear bonds originated in Germany in the 1930s and was widely used in the climax of European and American transportation construction in the 1960s. By the 1990s, beam composite bridges were rapidly promoted in European countries and Japan, and became the mainstream bridge type of long-span beam bridges. [0003] In the 21st century, my country has made many innovations and developments in the design theory of composite structure bridges, shear key construction forms and construction techniques, making composite structure bridges widely used. The main forms of composite structure bridges are: composite steel plate g...

AI Technical Summary

Problems solved by technology

Since this method is not a one-time simultaneous measurement, the jacking of a single support will be affected by the overall stiffness of the steel beam frame, resulting in a deviation between the measured support reaction force and the actual weight of the integrated bridge

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