Calculation method for ultimate shear-carrying capacity of bundled long and short shear nails

Abstract

The present invention provides a calculation method for an ultimate shear-carrying capacity of bundled long and short shear nails. The method comprises: firstly, launching a push-out test and finite element analysis of long and short shear nails to obtain an average single nail ultimate shear-carrying capacity, studying rules of effects of parameters of long and short shear nails, such as diameter, length, strength, elastic modulus and concrete strength, on shear-carrying capacity of a shear nail, performing non-linear regression analysis on ultimate shear-carrying capacity of the shear nail by a differential evolution method, and establishing a calculation formula of the ultimate shear-carrying capacity of the bundled long and short shear nails; and then, studying load, ultimate shear-carrying capacity and a relative slip value between a steel beam and a concrete slab of the long and short shear nails, and performing regression analysis to obtain a calculation formula of a load-slip curve of the bundled long and short shear nails. The method provided by the present invention solves the problem that the prior specification cannot consider staggered arrangement of different lengths and diameters of the shear nails for calculation of capacity, and provides technical supports for design long and short shear nails in steel-mixed composite structures.

Description

technical field [0001] The invention belongs to the technical field of bridge and culvert engineering in the transportation industry, and in particular relates to a method for calculating the ultimate shear bearing capacity of clustered long and short shear nails. Background technique [0002] The steel-concrete composite structure can give full play to the advantages of good compressive performance of concrete and high tensile strength of steel, and its application in long-span bridge construction has gradually increased in recent years. In order to speed up the construction of steel-concrete composite bridges and reduce the impact of bridge construction on the surrounding environment and traffic, some scholars have proposed to divide the concrete bridge deck in steel-concrete composite bridges into upper and lower layers, of which the lower layer is made of precast concrete. The slab is assembled with the steel main girder to form a prefabricated beam. After the prefabrica...

AI Technical Summary

Problems solved by technology

However, the calculation of the shear bearing capacity of shear studs in the existing codes is mainly for the shear studs with equal length and equal diameter, and it is not applicable to the analysis and calculation of cluster shear studs with different lengths and different diameters.

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