论文部分内容阅读
根据鱼脊连续梁桥构造特点及力学特性,通过有限元模拟方法,研究探讨了鱼脊梁施工工艺、鱼脊预应力束合理张拉、合龙方案等关键技术。结果表明:鱼脊连续梁由鱼脊和主梁共同受力,主梁以受压为主;鱼脊梁宜分层、分段施工,鱼脊预应力宜分批分散布设、张拉。同时,研究发现先结构体系转换后中跨合龙会导致中跨线形下挠明显,对跨径150m以上的连续梁线形控制较危险。最后,通过参数敏感性分析,给出影响鱼脊连续梁桥线形控制的主要参数。
According to the structural characteristics and mechanical characteristics of the fish ridge continuous girder bridge, the key technologies of the fish ridge spine construction technology, the rational tension and prehension scheme of the fish ridge prestressing force beam are studied through the finite element simulation method. The results showed that the continuous ridge of fish ridges was mainly supported by the fish ridges and the main beam, and the main beam was mainly compressive. The fish ridges should be stratified and segmental construction. The prestress of fish ridges should be distributed and tensioned in batches. At the same time, the study found that the mid-span closure after the conversion of the first structural system will cause the midline cross-shaped to flex under the next, and the linear control over the continuous beam with the span of more than 150m is more dangerous. Finally, the main parameters that affect the linear control of fish ridge continuous girder bridge are given through parameter sensitivity analysis.