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荷载缓和装置能通过缓和构件内力、自动调整结构形状来保护结构.本文介绍了阻尼弹簧杆和一种新型荷载缓和装置在双索张弦桁架结构中的应用.通过有限元数值建模对构件内力和结构位移进行了理论计算,比较了7种荷载缓和布置方案对双索张弦桁架结构静力和动力性能的改进,总结了活荷载、水平地震荷载和弹性刚度系数对杆件内力和竖向位移的影响.结果表明,在下弦索设置新型荷载缓和装置时内力荷载缓和效果最佳,且荷载缓和效果与弹性刚度系数成反比;随着活荷载增加,抽样计算分析的单元呈现下弦杆内力减小,上弦杆、斜腹杆和下弦索内力增加的变化规律,采用荷载缓和装置后杆件内力增加幅度下降明显;在地震力作用下,荷载缓和装置通过增加结构变形降低了下弦索的应力非线性程度,避免结构发生倒塌破坏.
The load mitigation device can protect the structure by adjusting the internal force of the component and automatically adjusting the shape of the structure.This paper introduces the application of the damping spring bar and a new type of load mitigation device in the double cable truss structure.The finite element numerical modeling And structural displacements are theoretically calculated. The improvement of static and dynamic performances of double-stringed truss truss structure with seven kinds of load mitigation schemes are compared. The effects of live load, horizontal seismic load and elastic stiffness coefficient on internal force and vertical The results show that the internal force load mitigation effect is best when the new type of load mitigation device is installed on the lower chord, and the load relaxation effect is inversely proportional to the elastic stiffness coefficient. With the increase of live load, the unit of sampling calculation and analysis shows the internal force of the lower chord The increase of inner force of small, winding rod, diagonal web and bottom chord increased obviously. The increase range of internal force of the rod decreased obviously after using the load mitigation device. Under the action of seismic force, the load mitigation device reduced the stress of the lower chord by increasing the structural deformation Linearity, to avoid structural collapse collapse.