异型桥墩承台受力性能分析与裂缝计算研究

Analysis and Study on Mechanical Behavior and Crack Calculation of Special-shaped Pier Base Slabs

摘要:

随着城市化进程的加速，异型结构在桥梁工程中的应用日益增多，对异型桥墩承台的承载机理、破坏模式及力学性能的研究显得尤为重要。结合苏州某大跨径桥梁工程，系统分析异型承台下群桩基础的桩顶反力分布规律，对比承台各项力学性能指标，得出影响其配筋设计的关键因素。通过对比中国《公路桥涵设计规范》（JTG D60—2015）、《混凝土结构设计规范》（GB50010—2010）与欧洲规范在裂缝计算方面的差异，并借助MIDAS FEA有限元软件对承台非线性受力状态下的裂缝开展进行模拟，深入阐释了不同计算方法产生差异的原因，并提出了相应的计算修正方法。研究成果最终应用于实际工程中，效果良好，为同类异型承台结构的设计提供参考。

Abstract:

With the acceleration of urbanization, the application of special-shaped structures in bridge engineering is increasing. It is particularly important to study the bearing mechanism, failure mode and mechanical properties of special-shaped pier base slabs. Combined with a long-span bridge project in Suzhou, the distribution law of pile top reaction of pile group foundation under special-shaped base slabs is systematically analyzed. The mechanical performance indexes of base slab are compared, and the key factors affecting the reinforcement design are clarified. By comparing the differences in crack calculation between the Code for Design of Highway Bridges and Culverts, and Code for Design of Concrete Structures in China and the European standards, and using MIDAS FEA finite element software to simulate the crack development under the nonlinear stress state of the base slabs, the reasons for the differences in different calculation methods are explained in depth, and the corresponding calculation correction methods are proposed. The research results are finally applied to practical engineering, and the effect is good, which provides a reference for the design of similar special-shaped base slab structures.