Abstract
In order to study the fire resistance of straight tenon joint with dowl, this paper uses finite element software to establish the joint temperature field model. Through this model, the temperature distribution of each part of the joint is obtained. In this paper, the sequential coupling method is used for the simulation of the heat-force coupling field, and the residual bearing capacity of the straight tenon joint with dowl at high temperature is modeled and analyzed. Through this analysis, the stress cloud diagrams of the damage modes of the joint under different high-temperature conditions were obtained, as well as the change curves of mechanical parameters such as the bending moment-angle curve, rotational stiffness, yielding angle, yielding moment and maximum moment of the joint at different temperatures. The simulation results show that the maximum heating temperature of the joint increases, the more easily the node is damaged. With the increase of the maximum temperature, the percentage of the residual bearing capacity of the joint in terms of rotational stiffness, yielding moment and maximum moment decreases gradually.