Judgment method for dynamic responses of reinforced concrete columns under blast load

Abstract

The invention discloses a judgment method for dynamic responses of reinforced concrete columns under a blast load. The method comprises the following steps: (1) single macroscopic spring units without physical length are respectively built at two ends of the reinforced concrete columns, and comprise axial springs and shearing springs; (2) an area surrounded by stirrups in the cross sections of the reinforced concrete columns is delimited as a core concrete area; an area at the periphery of the core concrete area is a periphery concrete area; the core concrete area and the periphery concrete area are respectively calculated to obtain stress-strain relationship curves of the axial springs and the shearing springs; (3) an axial pressure-axial deformation relationship curve of the axial springs and a shearing force-shearing deformation relationship curve of the shearing springs are obtained to build a macroscopic model which is analyzed by the dynamic responses of the reinforced concrete columns under the blast load. The judgment method can accurately and timely judges the dynamic responses of the reinforced concrete columns under the blast load.

Description

technical field [0001] The invention relates to structural engineering technology, in particular to a method for judging the dynamic response of reinforced concrete columns under explosive loads. Background technique [0002] In recent decades, various types of explosions have occurred frequently around the world, posing a huge threat to people's lives and properties. How to ensure the anti-blast safety of important buildings through structural anti-blast analysis, design or reinforcement has become an important issue. Technical problems faced by engineers and technicians in modern countries. The reinforced concrete structure has become the first choice for the anti-blast design of building structures because of its large mass and its ability to effectively resist the instantaneous action of blast shock waves. Anti-knock and even anti-successive collapse performance of the structure. For the dynamic response analysis of reinforced concrete columns under blast loads, separa...

AI Technical Summary

Problems solved by technology

The simulation results of the separate numerical analysis model are accurate, but the modeling is complex, the calculation efficiency is low, and the computer hardware requirements are high, so it can only be used for the anti-blast analysis of a single column or small building structure, and cannot be used for large-scale calculation analysis

In recent years, scholars at home and abroad have tried to use the fiber element model to simulate the dynamic response analysis of reinforced concrete beams and columns under explosive loads. Although the calculation efficiency has been improved, the fiber model based on the Hugles-Liu beam element is not suitable for reinforced concrete under explosive loads. There are defects in shear deformation, and under the actual explosion load, with the magnitude and duration of the explosion load, the reinforced concrete column will undergo bending failure, oblique shear failure and direct shear failure. Therefore, the fiber model has certain limitations

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