中承式景观拱桥总体设计及优化

Overall Design and Optimization of Half-through Landscape Arch Bridge

摘要:

以中山市长洲大桥工程为背景，系统性地介绍中承式景观拱桥的总体布置、景观设计、关键节点构造，并对结构体系、矢跨比、拱肋内倾角、预拉力等关键技术参数的进行分析和优化。研究结果表明：矢跨比越大，拱脚水平推力越小，对结构越有利；拱肋内倾角的变化对稳定系数影响较小；拱桥采用部分推力体系，设置合理的系杆预拉力，可以有效降低拱脚水平推力，减少下部结构的规模；通过结构的优化调整，可以达到力与美的平衡。

Abstract:

Taking the Zhongshan Changzhou Bridge Project as the background, the overall layout, landscape and key node construction of a half-through landscape arch bridge are systematically introduced. And the key technical parameters of structural system, rise span ratio, arch rib inclination angle and pretension force are analyzed and optimized. The research result shows that the larger the rise span ratio is, the smaller the horizontal thrust at the arch foot will be, which is more beneficial to the structure. The variations in the arch rib inclination angle has a relatively small influence on the stability coefficient. The arch bridge is used with the partial thrust system. The reasonable setting of tie bar pretension force can effectively reduce the horizontal thrust at the arch foot and decrease the scale of substructure. The optimization and adjustment of structure can achieve a balance between strength and beauty.