节段预制拼装箱梁架梁施工安全性分析

摘要

通过大型有限元软件 ABAQUS，建立了东莞地铁 R2线2312标的节段预制拼装简支箱梁三维空间有限元仿真模型，论证了在架桥机过跨和架梁两种最不利工况作用下的梁体受力性能，提出了梁端附近混凝土拉应力过大问题的施工对策，并分析论证了临时支撑措施的有效性，保证了架梁施工荷载下结构的安全性。%By ABAQUS establishing a three-dimensional finite element model of the Dongguan metro R2 line 2312 standard segmental prefabrica-ted box girder,it is demonstrated that the box girder is affected by the cross and frame beam construction,give a solution to avoid the problem of the oncrete tensile stress near the end of the beam is too large,and through analysis,it is proved that the temporary support measures are effec-tive,ensured the structure safety of erecting beam construction load.