中文摘要：

钢桁梁拱桥是大跨度桥梁常用的一种结构形式,结构稳定性问题是该类桥梁设计和施工过程中的重要控制因素之一.采用有限元法对南淝河特大跨度钢桁梁柔性拱桥进行了各施工工况下的结构强度分析,确定了危险施工工况及其对应的危险杆件.采用结构稳定理论计算了危险杆件的应力水平,由此对施工过程提供了安全性预测和监控实施.依据计算结果对危险施工工况的超应力杆件提出了加固措施,并进行重分析和强度评估,其加固应用确保了该桥梁的施工安全.

英文摘要：

Steel truss arch bridge is a common structural style, and the structural stability is an important control factor in its design and construction process. The finite element method is used to analyze the structural strength of the super-spanned steel truss arch bridge near Nanfei River in all construction cases in order to ensure safety of the bridge. Furthermore, the stress of dangerous members subjected to pressure is calculated by using the stability theory. Thus the safety prediction and monitoring of the construction process are implemented. According to the computing results and the design code, a strengthening project for the members over allowable stress is proposed and used in the construction of the bridge, which will avoid the unstability of the bridge in the construction process.