Analysis of the response characteristics of welded connection joint exposed to fire

The finite element method is applied to simulate thermal and structural coupling response of welded connection joint exposed to fire.The fire behavior of welded connection joint under different elevated temperature conditions is analyzed.The effect of specific parameters on joint is revealed.The fire-resistance performance of welded connection joint and bolted-and-welded joint is comparatively analyzed.The results indicate that the elevated temperature curves with different temperature rise rates can significantly affect fire-resistance time of welded connection joint in fire.The increase of load ratio will lead to the decrease of limited time under the same fire condition.The welded connection joint with stiffeners can improve fire-resistance time.The fire-resistance of welded connection joint is higher than that bolted-and-welded joint under the same elevated temperature condition.All these results offered technical references for fire-resistant design of welded connection joint.