大跨宽箱连续刚构桥空间受力分析

Space Forced Analysis on Large-Span Continuous Rigid Frame Bridge with Wide Box Girder

大跨径宽箱连续刚构桥由于自身的力学特点,普遍存在箱梁开裂和跨中下挠过大等不良现象。以南河底特大桥的工程实际,利用空间有限元法对其进行整体及局部分析。通过分析比较,得到如何有效避免宽箱梁开裂和跨中下挠过大,对此类桥型具有普遍意义和工程实用价值。

Because of the mechanic feature of large span continuous rigid frame bridge with wide box girder itself,the phenomena of cracks of the box girder and excessive deflection in the middle of the span widely exist. Taking Nanhedi Bridge as an example, both global and partial analysis on this bridge is carried out, using 3 D finite element method. The problem how to avoid the cracks in the box girder and excessive deflection in the middle of the span is resolved through the analysis and comparison which is worthy to apply into the engineering practice.