数值积分法计算受损伤圆钢管轴压杆件极限承载力

Calculation of the Ultimate Bearing Capacity of Damaged Round Steel Tubing Members with Numerical Integral Method

以电力构架中常用的圆钢管构件为研究对象,采用数值积分方法研究其在一般受损条件下的轴压极限承载力的变化情况.在迭代条件中采用混合迭代的方法,避免了在截面M-P-Φ关系计算中迭代不收敛的问题.并分别讨论了不同损伤区域长度、损伤凹口弹度、损伤位置等对杆件极限承载能力的影响,了解了多杆件极限承载能力的特点,所得结论可供设计人员参考.

This paper studies round steel tubing members,which are widely used in power transformation structures,on the changing of their ultimate bearing capacity under general damaged conditions through numerical integral method.To calculate M-P-Φ of the members' sections,it will take much time,and sometimes the integral is not constringent.So,in this paper,the mixed method is introduced,and the approximate formula for M-P-Φ is suggested.Thus the impact of different damage conditions on the members' stability ultimate bearing capacity is discussed.The conclusions can be helpful to the designers.