PC连续梁钢箱拱肋组合桥受力性能分析

Analysis on Mechanical Behavior of PC Continuous Beam Steel Box Arch Rib Composite Bridge

为探讨预应力连续梁系杆拱桥成桥受力及三角区局部力学性能分布状态,对一座预应力连续梁系杆拱桥进行了有限元分析研究,使用有限元软件MIDAS/civil构建全桥系杆模型,分析了拱肋、主纵梁、拉杆和吊杆构件在施工和运行阶段的受力行为。结果表明,在施工阶段和承载力极限状态下,预应力连续梁束拱桥主要构件的力学性能满足相关规范要求;正常使用极限状态下,除主梁受拉区配筋计算结果超出规范要求外,各构件应力均满足要求。随后,使用有限元软件ANSYS对V形墩与主梁连接处的三角形区域进行局部分析,依据分析结果提出建议,对箱梁的拉应力腹板布置配筋网,以防止腹板开裂;在中跨墩梁交界内侧倒角处存在拉应力超限现象,对该区域应采取相应拉应力补强加固措施。

To explore the load distribution and local mechanical performance of a prestressed continuous beam-tied arch bridge,finite element analysis of a specific bridge is carried out.The bridge model is constructed using the finite element software MIDAS/civil,and the mechanical behavior of the arch rib,main longitudinal beam,tie bar,and suspender components during both the construction and operation phases are analyzed.The results indicate that the mechanical properties of the main components of the prestressed continuous beam tied arch bridge meet the relevant specifications during the construction stage and the ultimate bearing capacity state.In the normal serviceability limit state,all components except for the tension area of the main beam meet the stress requirements.Subsequently,the triangular area at the connection of the V-shaped pier and the main beam is analyzed using the finite element software ANSYS.Based on the analysis results,it is recommended to reinforce the tensile stress web of the box girder with reinforcement mesh to prevent cracking.Moreover,there is an occurrence of excessive tensile stress at the inner corner of the joint section between the mid-span pier and the beam,thus the implementation of corresponding strengthening measures are recommended in this area.