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研究带弹性边支撑桁架平面外屈曲性能。对与支撑刚度有关的桁架临界屈曲荷载的敏感性进行分析。基于敏感性分析,提出了确定全支撑桁架支撑刚度的临界值的方法。研究了不同初始支撑刚度条件下,支撑刚度对屈曲荷载的影响线;得到了屈曲承载力和支撑刚度之间关系的近似表达式;确定了与边支撑距离相关的屈曲强度,它是支撑刚度的函数。分析表明,带弹性支撑的弦桁架的屈曲强度远高于按规范设计的桁架。
Study on out-of-plane buckling behavior of truss with elastic edge. The sensitivity of truss critical buckling loads related to supporting stiffness was analyzed. Based on the sensitivity analysis, a method to determine the critical value of full support truss stiffness is proposed. The influence of the support stiffness on the buckling load under different initial support stiffness conditions is studied. The approximate expression of the relationship between the buckling capacity and the support stiffness is obtained. The buckling strength related to the support distance is determined, which is the stiffness of the support function. The analysis shows that the buckling strength of chord truss with elastic support is much higher than that of truss designed according to specifications.