影响双向张弦梁结构受力性能的参数分析

Analysis of parameters affacting mechanical performance of bidirectional beam string structure

摘要:

为了寻求合理设计双向张弦梁的方法,考察双向张弦梁主要几何参数对结构用钢量的影响．运用基于平衡荷载态进行双向张弦梁优化设计的方法,以结构用钢量最小为优化目标,对结构的高跨比、垂跨比、两向间距比、平面长宽比以及影响预应力取值的平衡荷载值的大小5个参数进行系统深入的分析．结果表明：高跨比和垂跨比的增大对结构用钢量影响近似线性递减,两向间距比对结构用钢量影响不大,使得结构空间布置可以灵活处理,平衡荷载大小存在最优值且对结构荷载态的刚度影响很大．在设计中应首选加大结构高跨比,尽量增大垂跨比,通过计算平衡荷载值确定预应力取值．

Abstract:

In order to seek the reasonable design method of bidirectional beam string structure, the effect of main geometric parameters on steel consumption was analized. By using the optimization design method of bidirectional beam string structure based on equilibrium load state, the minimum amount of structural steel as the optimization target, the influence to the structure optimization resulted by the high-span ratio, sag ratio, spacing ratio in two directions aspect ratio, the balancing load value and other parameters was discussed. It’s found that the high-span ratio and the sag ratio increasing lead to linear descending of steel consumption. The low influence by spacing ratio in two directions makes the structure space arrangement of ambassador can be flexibly handled. The balancing load has an optimal value and has a big effect to the structure stiffness on load state. Bidirectional beam string structure design should be preferred to increase the high-span ratio and try to increase the sag ratio. Prestress is determined by balancing load caculation.