Performance of Concrete Structure after Fire Disaster Based on Thermal Stress Coupling Field Analysis

Abstract

Concrete is a kind of non-combustible material, but its mechanical properties are quite sensitive to temperature, once the temperature exceeds the limit temperature of steel and concrete, the structure of the building will be broken, therefore it’s an urgent task to study the fire resistance, bearing capacity and stability of the concrete structure after fire disaster, and to respond to these questions, this paper studied the performance of concrete structure after fire disaster based on thermal stress coupling field analysis. At first, this paper gave the method for collecting displacement changes of each surface of concrete structure under high temperature during the experiment, and analyzed the thermal expansion strain of the concrete under thermal stress coupling effect. Then, to investigate the changes in the stability of concrete structure under high temperature, this paper simulated the thermal stress coupling of concrete structure after fire. After that, parameters of the concrete structure under high temperature were selected to further simulate the fire disaster temperature field of the concrete structure under high temperature and construct the corresponding heat conduction differential equations of the structure. At last, this paper analyzed the experimental results, proposed conclusions, and verified the effectiveness of the proposed parameter calculation method.