张弦梁结构弹塑性大位移分析

Elasto-Plastic Large Displacement Analyses of Beam String Structure

运用由梁单元、杆单元和索单元组成的混合有限元法对采用工形截面钢拱梁的张弦梁结构进行了静力弹塑性大位移分析,通过跟踪结构在自重类荷载、半跨分布荷载以及风荷载作用下的平衡路径全过程,明确了结构在不同荷载作用下的破坏模态,以及撑杆数目、初始几何缺陷、材料弹塑性等因素对结构受力性能的影响,并得出了宜在结构跨中设置撑杆、初始几何缺陷对张弦梁结构的承载力影响不大等结论.

In this paper, based on elasto-plastic large displacement finite element theory, Beam String Structure (BSS) was modeled by beam, truss and cable elements. The full load-displacement paths of BSS with H-section steel beam were traced with self-programmed software BSSAP, from which the failure models of this kind of structure under full span evenly distributed load, half span evenly distributed load and wind load were studied. Through multi-parameter analyses, the effects of such factors as strut number, initial geometric defect and material plasticity etc on the mechanical performance of this kind of structure were further clarified. Some useful conclusions such as the performance of BSS can be greatly improved by setting a strut in the middle span of it etc were drawn.