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混凝土的收缩徐变和车辆超载是大跨度连续梁桥主梁下挠严重的主要因素之一。
The creep is the main reasons why the deflection of the girder is larger than that of code.
主梁下挠变形的主要原因是受热引起的最大复合应力超过许用值，达到了屈服极限值，强度不满足要求。
The main reason of the main beam down deflection was that the most complex stress exceeded the admissible value and achieved the yield limit value.
通过对主梁的受力、挠度进行分析，为制订预应力张拉修复桥式起重机主梁下挠工艺参数提供了设计计算方法。
This paper analyses the beam load and deflection and also proposes the calculating method to work out the technology parameter.
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