中文摘要：

目的对刚果（布）1号公路二期工程Djoué组合梁桥的施工阶段受力进行研究,验证施工过程中的结构是否处于安全状态.方法对该桥的施工过程,计算模型和参数进行介绍,并采用大型通用有限元软件ANSYS的＂生死单元＂技术实现对该桥的施工过程仿真分析,比较了不同施工阶段的受力情况.结果按照考虑施工过程计算出的钢梁应力为105 MPa,钢梁位移为57.524 mm.针对考虑施工过程和直接计算结果进行比较,在应力结果方面,两种方法所得结果十分接近,而在位移结果方面,两种方法存在相对明显的区别,考虑施工过程计算出的位移要大于不考虑施工过程计算出的位移.结论对结构进行施工过程分析时,施工阶段的划分应尽量做到详细而准确,力求对施工全过程的数值模拟结果更加精确.对于Djoué桥这类跨度适中的钢混组合桥,可采用直接计算方法得到成桥后的桥梁受力状态,并参考本例对所得的位移结果进行一定放大.

英文摘要：

In order to study the stresses of the Djoué steel-concrete composite bridge in the second stage of the 1st national road project in Congo（ Brazzaville） at construction process and verify whether the structure of the construction process in a safe state,the construction process of the bridge,the calculation model and parameters are introduced in this paper. Birth-death element techniques of the large general finite element software ANSYS enables the bridge construction process simulation,as well as the comparison of stress status of different construction processes. Results show that：stress and displacement with consideration of the construction process is greater than that without consideration of the construction process. Therefore,it is very necessary to make the construction process simulation when evaluating and analyzing the safety of the structure.