索-混凝土板预应力组合网架的自振特性分析

Analysis of Natural Vibration Characteristics of Cable-Concrete Slab Pre-Stessed Composite Grids

提出了一种上弦为混凝土板、下弦为预应力索的新型预应力组合网架结构形式,利用有限元软件对其进行自振特性分析,得到了结构的各阶振型和自振频率;研究了不同预应力、边界条件、跨度、网架高度对索-混凝土板预应力组合网架结构自振特性的影响,得出了索-混凝土板预应力组合网架结构自振特性的一般规律.

This paper presents a new type of pre-stressed composite grids structure that the top chords are concrete slabs and the lower chords are pre-stressed cables. The natural vibration character -ristics are analyzed with finite element software, to get self-vibration frequency and grids different order vibration mode; and the influence of different pre-stressed, boundary conditions, different span and heights on natural frequencies of the cable-concrete slab pre-stressed composite grids structure is studied. The general conclusion of the natural vibration characteristics of the cable-concrete slab pre-stressed composite grids structure is obtained.