摘要
本文运用数值模拟的方法,建立非等壁厚钢管桩数值模型,通过改变过渡段长度,在弯矩作用下,得到过渡段长度对焊接位置处应力集中系数的关系,并对相应的理论公式做出修正。研究发现,在非等壁厚钢管焊缝位置处设置过渡段有利于降低焊缝位置处的应力集中系数,当钢管的直径在1 m~2.5 m之间时,应力集中系数下降幅度约为5%,当钢管直径取2.5 m~4 m之间时,应力集中系数下降幅度约为8%。说明钢管的直径越大,设置过渡段的效果越明显,该研究为进一步探析钢管桩焊接过程中的应力分布形式提供了参考,也为分析钢管桩焊缝的疲劳寿命打下基础。
the numerical simulation method is used to build the numerical model of steel pipe piles with variable wall thickness.The length of transition section can be changed to test the relation between the length of transition section and the stress concentration coefficient at the weld seam under the action of bending moment,and the corresponding theoretical formula is revised.It is found that the transition section set at the weld seam of steel pipe with variable wall thickness can effectively lower the stress concentration coefficient at the weld seam.The stress concentration coefficient decreases by about 5% when the diameter of steel pipe is within the range of 1 m~2.5 m.The stress concentration coefficient decreases by about 8% when the diameter of steel pipe is within the range of 2.5 m~4 m.It is concluded that more significant effect is achieved by setting the transition section with the increment of steel pipe diameter.This research results will support further analysis of stress distribution in the welding process of steel pipe piles as well as the fatigue life of weld seam of steel pipe piles.
作者
李世亚
向思杰
吴树航
刘佳伟
Li Shiya;Xiang Sijie;Wu Shuhang;Liu Jiawei(State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Civil Engineering College,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《港工技术》
2021年第4期58-61,共4页
Port Engineering Technology
基金
交科院开放基金资助,实验室开放基金项目,ZD2016-01,在役钢筋混凝土梁粘贴钢板加固后安全评估试验研究。
关键词
变壁厚钢管桩
环向焊缝
弯矩作用
过渡段
数值模拟
steel pipe pile with variable wall thickness
circumferential weld seam
moment action
transition section
numerical simulation
