独柱支承连续箱梁天桥活载偏载时的滑移分析

对某独柱支承连续箱桥在护栏施工时发生的支座脱空、梁体滑移事故,采用实体单元建立的整桥模型进行了施工及运营阶段受力分析。分析表明,独柱支承桥梁在运营阶段不管是单车道偏载还是人群偏载作用下都不会出现支座脱空现象。但施工时未进行桥面铺装,且仅完成一侧护墙建造的工况下会出现支座脱空现象。

Sliding Analysis on Offset Load of Single Support Continuous Box Girder Bridge

A single support continuous box girder bridge appeared bearing disengaging and girder slippage during its guardrail construction. The author made stress analysis of construction and operation stages, adopting the entire model built by solid element. It showed that single support bridge could not appear bearing disengaging under whether single trace or population offset load during its operation stage. But bearing disengaging would appear when only one guardrail has been built and deck pavement has not been done.