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通过对一直径6m的葵花型索穹顶试验模型,进行竖向对称加载、非对称加载以及拉索瞬间破断试验,研究了该结构的受力特点以及单根拉索瞬间破断时结构的响应特征。应用非线性有限元数值计算方法建立索穹顶计算模型,对葵花型索穹顶结构的力学性能进行了分析,并与试验结果进行比较。结果表明:在各加载阶段,节点竖向位移实测值普遍较计算结果偏大,拉索索力实测值与计算结果总体吻合较好;对称加载过程,结构的荷载-位移关系具有较好的线性规律;与对称加载比较,非对称加载的荷载-位移关系则表现出非线性,节点位移也较大,非对称荷载对结构竖向刚度的设计起控制作用;单根拉索瞬间破断时,结构会有微幅振动,不同位置拉索的失效对结构的影响程度不尽相同。
Through a 6m diameter sunroof cable dome test model, vertical symmetrical loading, asymmetric loading and cable instantaneous breaking test were carried out to study the force characteristics of the structure and the response characteristics of the structure when a single cable was broken instantaneously. The calculation model of cable dome was established by using nonlinear finite element numerical method. The mechanical properties of sunflower cable dome were analyzed and compared with the experimental results. The results show that the measured values of the vertical displacement of the joints are generally larger than the calculated values at each loading stage, and the measured values of the cable forces generally agree well with the calculated ones. The load-displacement relation of the structures has a good linearity Compared with the symmetrical loading, the load-displacement relation of the asymmetric loading shows nonlinearity and the displacement of the joints is also larger. The asymmetric load plays a controlling role in the design of the vertical stiffness of the structure. When a single cable breaks instantly, the structure A slight vibration, different positions of cable failure on the structure of varying degrees.