索-钢/铝合金组合结构初始态确定及静力分析

Initial state determination and static analysis of composite cable and steel/aluminum structures

索-钢/铝合金组合结构作为一种新颖的结构形式,是由拉索和压杆(钢管/铝合金圆管)组成的自应力状态下的稳定自平衡体系,体系中受拉连续,受压不连续.在给定结构几何外形和拓扑关系的基础上,采用动力松弛法确定该体系的自应力初始态;在自重及外部荷载作用下,采用牛顿-拉弗森方法分析确定结构的静力性能.为揭示此类结构的受力机理,该体系中的压杆分别采用钢管和铝合金圆管,对比分析两类组合结构在受力性能方面的异同.数值算例表明了本方法的实用性和优越性,为索-钢/铝合金组合结构在实际工程中的推广应用奠定了基础.

Composite cable and steel/aluminum structure is a new system. It is in a self- stress and stable self-equilibrated state, comprising a continuous set of tension members （cables） and a discontinuous set of compression components （steel pipes or alloy tubes）. Starting from an initial specified geometry and topology, the initial self-stress is determined using a dynamic relaxation method. The behavior of the structure is analyzed for safely resisting the self-weight and applied static load using the Newton-Raphson method. To understand its mechanical property, steel pipes and alloy tubes are used as compression members respectively in the two kinds of composite structures. Application of the process is shown with a numerical example. It is concluded that that improvement in engineering application of the composite cable and steel/aluminum structure has been achieved.