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由于关于索网幕墙端部加弹簧装置的研究很少,因此,对如何选取索端弹簧刚度以及弹簧在索受力过程中有何种作用是索网幕墙设计工作十分关注的问题。为此,基于北京奥体南区3号地项目前期索网计算模型,在保证外荷载和各索预应力或索网最大挠度不变的条件下,分析了弹簧刚度对索网受力性能的影响。结果表明:在外荷载相同时,弹簧刚度越小,竖索的轴力和竖向支座反力越小,对满足竖索及与竖索相连主体结构的承载力要求越有利,但同时会引起横索轴力和竖索最大挠度或竖索初始预应力的增大;弹簧刚度越小,竖索的内力越不均匀,并且这种不均匀程度主要与竖索承受的重力荷载有关,而与初始预应力和挠度变化无关;弹簧刚度越小,弹簧参与整体受力的程度越大,但不能以弹簧与索的线刚度比值1作为划分弹簧参与整体受力程度的依据;满足设计要求的弹簧刚度不唯一。
Because there is little research on the spring-loaded device for the end of the cable network, it is a very important issue how to select the spring stiffness of the cable end and the spring force in the process of cable bearing. Therefore, based on the calculation model of the cable network in No.3 South of Beijing Olympic Stadium project, under the condition that the external load, the prestress of each cable or the maximum deflection of the cable network are unchanged, the influence of spring stiffness on the mechanical properties of the cable network influences. The results show that the smaller the spring stiffness is, the smaller the axial force of the vertical cable and the vertical bearing reaction force are, and the more favorable the bearing capacity of the main structure to meet the vertical cable and the vertical cable is. The maximum axial force and the maximum deflection of the vertical cable or the initial prestress of the vertical cable; the smaller the spring stiffness, the more uneven the internal force of the vertical cable, and the degree of this nonuniformity is mainly related to the gravity load on the vertical cable, The initial prestress and deflection change has nothing to do; the smaller the spring stiffness, the greater the degree of spring participation in the overall force, but can not spring and cable line stiffness ratio 1 as the basis for the division of the spring to participate in the overall degree of stress; to meet the design requirements of the spring Stiffness is not unique.