Construction method of combined evaluation model for overall and local damage of concrete filled steel tube members

Abstract

The invention discloses a method for constructing a joint evaluation model of overall and local damage of concrete-filled steel pipe members, which includes calculating the overall deformation and residual bearing capacity of steel pipe concrete members under each group of impact conditions; calculating the overall damage evaluation index of steel pipe concrete members ; Select the impact condition whose overall damage assessment index is equal to the overall damage boundary point, and draw the overall damage assessment curve corresponding to each overall damage boundary point; select any point on the overall damage assessment curve as the total energy consumption, and the value of its horizontal asymptote As the overall energy consumption; obtain the preset local damage evaluation index, and combine the local damage evaluation model to calculate the local damage cut-off point on each overall damage evaluation curve; connect the local damage cut-off point corresponding to the same local damage evaluation index as the local damage The evaluation curve uses multiple damage levels formed by the overall damage evaluation curve and the local damage evaluation curve to form a joint evaluation model of the overall and local damage.

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...

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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

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