均匀腐蚀下防落梁钢圈限位装置力学性能

Study on Mechanical Properties of a Steel Ring Anti-Fall Restrainer with Uniform Corrosion

目的研究防落梁钢圈限位装置在不同均匀腐蚀率下的力学性能,建立腐蚀率与暴露时间关系式,提出均匀腐蚀下钢圈限位装置剩余承载力计算.方法以均匀腐蚀率为设计参数,设计4个试验试件进行单调加载试验,建立4组共20个有限元分析模型,得到均匀腐蚀下钢圈限位装置的力-位移曲线和最终破坏形态,并分析均匀腐蚀率对装置力学性能的影响.结果得出了工程常用的矩形截面钢材均匀腐蚀深度和均匀腐蚀后钢圈限位装置剩余承载力的计算方法.随着均匀腐蚀率的增加,钢圈限位装置的一阶稳定刚度K1和极限承载力均呈现下降趋势;均匀腐蚀率对构件的二阶稳定刚度K2和极限位移无明显影响.结论均匀腐蚀对钢圈限位装置的力学性能影响较大,矩形截面均匀腐蚀深度和均匀腐蚀后钢圈限位装置剩余承载力的计算方法降低了工程实际应用时的计算难度.

The purpose of this paper is to study the mechanical properties of the steel ring restrainer with uniform corrosion,build the relationship of corrosion rate and exposure time,and deduce the calculation method of uniform corrosion rate and remaining bearing capacity of the steel ring restraine.The uniform corrosion rate was used as the parameter,and 4 test specimens were used to load experiments and 20 finite element analysis models were designed.The force-displacement curve of the steel ring restrainer with uniform corrosion was obtained.The mechanical properties and the failure modes with uniform corrosion are analyzed.The calculation method of uniform corrosion depth of rectangular section and the remaining bearing capacity of the steel ring restrainer with uniform corrosion were established.The stiffness K1 and ultimate bearing capacity of the steel ring restrainer decrease as the uniform corrosion rate increases.The uniform corrosion rate has slight effect on the stiffness K2 and the ultimate displacement of the restrainer.The uniform corrosion has a great influence on the mechanical properties of the steel ring restrainer.The calculation method of uniform corrosion depth of rectangular section and remaining bearing capacity of the steel ring restraine after uniform corrosion decrease the complexity of calculation in engineering application.