摘要
为解决钢管混凝土柱因冻胀产生的破坏,文中结合实际工程现场调查情况和冻胀裂缝破坏形态,对破坏后钢管混凝土柱进行了评估,制定加固方案并通过有限元软件ANSYS对冻融循环过程中钢管混凝土柱内混凝土温度场和温度应力的变化进行了有限元模拟.结果表明柱体在冻胀力和荷载作用叠加对钢管产生的环向应力超过钢管的极限拉应力,因此钢管发生了低温脆性破坏;采用加大截面方式进行加固处理,并将角部柱间支撑由单向支撑改为"X"支撑,增加整个结构的整体性和刚度,效果良好;结合ANSYS对冻融循环下柱体温度应力进行了有限元分析.最后,为避免工程产生类似的冻胀破坏,提出一些建议供大家进行讨论.
Abstract
To address the damage of concrete-filled steel columns caused by frost heave,this study combines field investigation data and observations of frost heave crack patterns to assess the damage of affected columns.It devel-ops a reinforcement plan and uses ANSYS finite element software to simulate temperature fields and temperature stresses in the concrete of the columns during freeze-thaw cycles.The results show that the combination of frost heave forces and loads generates circumferential stresses in the steel tubes that exceed their ultimate tensile stress,leading to brittle failure.Reinforcement by increasing the cross-section and changing the column-to-column corner braces from unidirectional to"X"braces improves the overall integrity and stiffness of the structure effectively.The study also includes ANSYS-based finite element analysis of temperature stresses in the columns under freeze-thaw cycles.Finally,recommendations are provided to prevent similar frost heave damage in future projects for discussion.
维普
万方数据