连续梁桥中跨合拢方案设计

A Design of Joining the Middle Span of Continuous Pre-stressed Bridges

连续梁桥合拢段施工时 ,温度应力常常是预应力混凝土梁桥产生裂缝的主要原因。如何在温度变化时保证合拢段混凝土的质量 ,是合拢段施工成功与否的关键。结合具体实例 ,运用有限元理论对连续梁桥中跨合拢施工进行模拟分析 ,提出了确定中跨合拢方案的基本原理、计算方法以及所应采取的施工措施 。

In joining the middle span of continuous pre-stressed beam bridge, the temperature stress is the main reason that produces cracks. The quality guarantee of the concrete is crucial to the success of the joining under temperature changes. A concrete example of bridge joining and the method of finite element theory are adopted in this paper to put forward a calculating method and some construction measures that can serve as references for the engineering undertakings of similar bridges.