论文部分内容阅读
多拱肋蝶形拱桥由于各拱肋的异化导致结构的受力异常复杂且空间效应明显,针对该桥型索力优化问题的特点,并考虑施工过程中混凝土的收缩徐变和结构的几何非线性等因素的影响,采用割线迭代法进行施工索力的调值计算,并对4种不同的调索方案从钢管内核心混凝土的拉应力、索力的不均匀程度、拱顶位移等方面进行对比分析。结果表明:割线法迭代速度较快,但适用范围小;调索顺序对各关心量值的影响较大,调索顺序不合理甚至会导致构件的破坏而影响结构在施工阶段的安全性及成桥阶段的承载能力;钢管内核心混凝土在索力调整过程中容易受拉开裂,在确定蝶形拱桥的调索顺序时,可将拱脚截面混凝土拉应力的变化规律作为切入点初拟调索方案,再从多个角度判断该方案的可行性。
Due to the alienation of each arch rib, the force of the structure is extremely complex and the space effect is obvious. According to the characteristics of the cable force optimization problem of the bridge type and considering the shrinkage and creep of the concrete during construction and the geometry of the structure Linearity and other factors, the tangential iteration method is adopted to calculate the value of the construction cable force. And four kinds of cable transfer schemes are analyzed from the aspects of the tensile stress, the nonuniformity of the cable force and the vault displacement in the concrete core of the steel tube For comparative analysis. The results show that the secant method has faster iteration speed and smaller scope of application, and the order of call retrieval has a greater influence on the value of each concern, and the order of call retrieval is unreasonable and may even lead to the destruction of components, which will affect the safety of the structure during construction and The load-bearing capacity of the bridge-forming stage; the core concrete in the steel pipe is apt to be pulled and cracked during the adjustment of the cable force; when the order of the cable-stayed bridge is determined, the variation law of the tensile stress of concrete at the arch- Cable program, and then from multiple angles to determine the feasibility of the program.