大跨梁拱组合体系景观桥梁设计和受力性能分析

Design&Mechanical Performance Analysis of Landscape Bridge with Super-Large Span Beam-Arch Combination System

下承式组合体系拱桥用于城市桥梁时,为美观需要,常常弱化拱肋截面或采用某些特殊拱肋造型。当应用于大跨径时,必须重视其稳定性并采取额外措施。为研究大跨径梁拱组合体系景观桥梁的整体受力性能和稳定性,以深圳市宝安区展览大道某桥为例,介绍拱肋、吊杆、钢纵梁、钢横梁设计,采用大型有限元软件MIDAS CIVIL建立有限元模型,进行成桥静力分析、成桥特征值分析、成桥屈曲分析,计算结果表明:大跨径钢拱纵横梁组合体系桥梁成桥受力合理,拱肋稳定性较好,为同类型桥梁设计提供参考。

When the through arch bridge is used in urban bridges,the arch rib section is often weakened or some special arch rib shapes are used for aesthetic purposes.When it is applied in large spans,its stability must be emphasized&additional measures must be taken.To study the overall mechanical performance&stability of a landscape bridge with a large-span beam-arch combination system,some bridge on Zhanlan Ave.,Bao’an District,Shenzhen is taken as an example to introduce the design of arch ribs,suspenders,steel longitudinal beams,and steel beams.The finite element model is established by using the large-scale finite element software MIDAS CIVIL,and the static analysis,eigenvalue analysis&buckling analysis of the completed bridge are carried out.The calculation results show that the bearing capacity of the longitudinal&transverse beam composite bridge with a large-span steel arch is reasonable,and the arch rib stability is good.