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大跨度预应力混凝土桥梁广泛采用悬臂法施工,悬臂法施工给桥梁结构带来不断变化的复杂应力和变形,诸多因素的变化影响着桥梁的预抛高.为研究影响施工中预应力混凝土铁路桥梁挠度的结构自重、温度、混凝土收缩徐变、预应力损失、混凝土加载龄期等的程度,结合某大跨径桥梁实际工程,应用MIDAS/Civil软件模拟了各影响因素对桥梁的挠度影响程度,将就温度、混凝土徐变以及预应力损失对桥梁挠度的影响进行敏感性分析研究,得到了混凝土徐变、预应力损失与大跨度铁路桥梁施工挠度的关系曲线,提出了具体可控措施.
Wide-span prestressed concrete bridges widely used cantilever construction, cantilever construction to bring changes in the bridge structure of complex stress and deformation, changes in many factors affect the pre-thrown bridge.To study the impact of prestressed concrete railway bridge construction Deflection of the structure self-weight, temperature, concrete shrinkage and creep, loss of prestress, the age of concrete loading, etc., combined with a large span of the actual bridge project, using MIDAS / Civil software to simulate the impact of various factors on the deflection of the bridge, The influence of temperature, concrete creep and prestress loss on the deflection of bridge are analyzed. The curves of concrete creep and prestress loss and the construction deflection of long-span railway bridges are obtained, and the concrete control measures are put forward.