大跨度预应力混凝土连续刚构桥梁施工关键技术研究

Research of Key Techniques for Construction of Long Span Prestressed Concrete Continuous Rigid-Frame Bridges

大跨度预应力混凝土连续刚构桥梁成桥后普遍存在"腹板开裂"、"跨中下挠"等质量问题,综合分析研究国内外大跨度连续刚构桥梁现状和国内多个徐变小梁试验结果,提出徐变计算的合理模式,探讨大跨度预应力混凝土连续刚构桥梁设计理论和施工工艺的优化和更新。

The quality problems like cracks in webs and defection at midspans commonly occur in the completed long span prestressed concrete continuous rigid-frame bridges. In this paper, the current status of the type of the bridges at home and abroad and test results of lots of the creeping beams of the bridges at home are comprehensively analyzed and studied, the rational modes of creep calculation are put forward and the relevant issues on optimizing and upgrading the existing design theories and construction technology of the bridges are discussed as well.