Abstract
In order to analyze the post-fire seismic performances of scoria aggregate concrete (SAC) beam-column joints precisely and effectively, one finite element model (FEM) was developed to simulate the seismic behavior of SAC beam-column joints. The FEM consists of two sequential parts: firstly, the heat transfer analysis of the beam-column joints, and then the seismic analysis of the SAC joints by combining the temperature field distribution obtained from the heat transfer analysis with the mechanical properties of the SAC after fire, both of which were implemented in ABAQUS. In order to make the simulation results more accurate, spring elements were applied to simulate the bond–slip behavior with material degradation due to fire damage in the simulation of seismic analysis. Moreover, in order to validate the FEM, the seismic behavior of the natural aggregate concrete (NAC) beam-column joints after fire was simulated with the established FEM, and the simulation results were compared with the available test data. It is proved that the FEM we built was accurate and effective and provided efficient solutions for evaluating the seismic performance of post-fire beam-column joints so that the effects of various parameters, namely, fire time, longitudinal reinforcement ratio, and axial compression ratio on the seismic performance of SAC beam-column joints after fire were investigated in depth, which indicated the increase of axial compression ratio can improve the strength, initial stiffness, and energy dissipation capacity of SAC joints, while the increase of longitudinal reinforcement ratio can increase the strength and stiffness of SAC joints to a small extent, but too high reinforcement ratio will significantly weaken the energy dissipation capacity of SAC joints.
Highlights
Tigations about the impact of fire exposure on bond failure between rebars and lightweight concrete. To this end, aiming at the seismic performance of scoria aggregate concrete (SAC) beam‐column joints after the fire exposure, this paper presented a finite element model (FEM) based on ABAQUS
Sure to fire in minutes; “0.012” stands for the beam’s longitudinal tensile reinforcement ratio; and “0.3” represents the axial compression ratio
The main conclusions can be made as follows: (1) The simulated hysteretic curves and skeleton curves are in good agreement with the test data, indicating the proposed FEM is accurate and can be used to predict the seismic behaviors of post‐fire SAC beam‐column joints
Summary
Tral with regard to jurisdictional claims in published maps and institu‐. The rapid growth of the global economy has led to an increase in the density of urban buildings and of the facility circuits and gas pipelines in the city. When a city is hit by an earthquake, the fracture of public facility circuits and gas pipelines is apt to trigger fires. Prolonged exposure to fire may significantly diminish the performance of structural materials, thereby affecting structural integrity. In this case, buildings are likely to suffer significant damage or even collapse in the subsequent after‐
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