Construction method of integral and local damage joint evaluation model of concrete filled steel tube member

Abstract

The invention discloses a construction method of integral and local damage joint evaluation model of a concrete filled steel tube member. The construction method comprises the following steps: calculating overall deformation and residual bearing capacity of a concrete-filled steel tube member under each group of impact working conditions; calculating an overall damage evaluation index of the concrete-filled steel tube member; selecting an impact working condition of which the overall damage evaluation index is equal to the overall damage boundary points, and drawing an overall damage evaluation curve corresponding to each overall damage boundary point; selecting any point on the overall damage evaluation curve as total energy consumption, and selecting the numerical value of the horizontal asymptote as overall energy consumption; obtaining a preset local damage evaluation index, and calculating a local damage demarcation point on each overall damage evaluation curve in combination with the local damage evaluation model; and connecting the local damage demarcation points corresponding to the same local damage evaluation index as a local damage evaluation curve, and forming an integral and local damage joint evaluation model by adopting a plurality of damage grades formed by the integral damage evaluation curve and the local damage evaluation curve.

Description

technical field [0001] The invention belongs to the technical field of impact dynamics of civil engineering structures, and in particular relates to a method for constructing a joint evaluation model of overall and local damage of concrete filled steel pipe components and an application of the evaluation model. Background technique [0002] Concrete-filled steel pipe members are composite stress-bearing members formed by filling concrete in steel pipes. The bearing capacity of members is greatly improved through the restraint of steel pipes on concrete, so they are widely used in high-rise and long-span structures. In addition to bearing static loads during normal service, CFST members must also have the ability to resist occasional strong dynamic loads. Once CFST members encounter lateral impact loads such as vehicle impact, rockfall impact, and flying object impact, different forces will occur. The degree of damage or even destruction poses a threat to people's life and pr...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the construction method and application of the joint evaluation model of the overall and local damage of the CFST member provided by the present invention solves the problem that the damage evaluation model in the prior art does not consider the local damage so that the damage evaluation results are inaccurate question

Images