广州从化大桥136 m拱梁组合结构设计与分析

Design and Analysis on 136-m Arch Beam Composite Structure of Conghua Bridge in Guangzhou

摘要:

采用Midas/Civil有限元软件，对广州从化大桥136 m下承式空间拱梁组合体系进行空间静力、动力分析和稳定性分析。计算结果证明：对于单跨的空间拱梁组合体系，外部为简支的静定结构体系改善了支座不均匀沉降的问题；拱梁组合结构体系合理，各构件受力满足规范的要求；由主拱、副拱以及横撑、斜撑组成的空间异形拱结构具有良好的稳定性；对于简支梁与三角拱组合体系，由于梁的刚度较小，需要较大刚度的拱肋作为受力构件承受桥梁的荷载；吊杆张拉力对主梁及拱肋的受力影响较大；在满足主梁受力要求的前提下，应尽量减小吊杆张拉力，从而有利于拱肋结构的受力和稳定性。

Abstract:

The Midas/Civil finite element software is used to carry out the spatial static analysis, dynamic analysis and stability analysis of 136-m through spatial arch beam composite system of Conghua Bridge in Guangzhou. The calculation result shows that the simple-supported statically determinate structural system as the external can improve the differential settlement of support for the single-span spatial arch beam composite system. The arch beam composite structural system is reasonable and each component stress meets the specifications. The spatial special-shaped arch structure composed of main arch, subarch, cross bracing and diagonal bracing has the good stability. For the simple-supported beam and triangular arch composite system, the arch rib with the greater stiffness as a stressed component is required to bear the bridge load because the beam stiffness is smaller. The tension of boom has the greater influence on the stress of the main beam and arch rib. Under the premise of meeting the stress requirements of the main beam, the tension of boom should be minimized so as to make for the stress and stability of arch rib structure.