【摘要】 对网架结构极限承载力的分析表明,是否考虑压杆稳定对于网架极限承载力有较大影响,因此需计入压杆失效效应.基于网架整体极限承载力由压杆屈曲失稳控制的理论,提出了加大压杆计算长度系数来提高网架结构承载力的方法.对多个网架结构算例进行了极限承载力分析,结果显示,加大压杆计算长度系数,可将40m至64m跨度内网架结构的极限承载力提高40%以上,同时对于其他跨度网架结构极限承载力的提高也较为有效.因此,通过适当提高压杆的计算长度系数,在用钢量增加不多的情况下,可大幅度提高网架结构的极限承载力,并可相应提高网架结构的抗连续倒塌能力.更多还原

【Abstract】 It is shown that whether considering the stability of the compressed bar greatly influences the ultimate bearing capacity of space grid structures.So the stability of compressed bar should be taken into consideration.A method which can improve the ultimate bearing capacity by increasing the bar’s effective length factor is presented.Numerical examples show that the method can significantly improve the ultimate bearing capacity,while steel consumption just increases slightly.Particularly the method can enhance the ultimate bearing capacity of space grids with spans from 40m to 64m by 40%.Thus appropriately raising the bar’s effective length factor can improve the ultimate bearing capacity of space grid structures greatly with slightly increasing of steel consumption.更多还原