鄂北地区水资源配置工程大跨度预应力渡槽三维有限元分析

鄂北地区水资源配置工程孟楼渡槽长4.99 km,设计流量38 m3/s,由于基岩埋藏较深,采用摩擦桩基础,承台上为空心混凝土重力墩,槽身采用大跨度预应力渡槽。通过对渡槽跨度的比较分析,认为采用30 m跨预应力混凝土渡槽较为合理。为此,重点对30 m跨矩形预应力渡槽槽身在各种荷载组合工况下的应力变形和环境温度影响进行了分析,验证了结构尺寸的合理性,优化了预应力钢筋的布置。

3-D FEM analysis on large-span prestressed concrete aqueduct for North Hubei Water Resources Allocation Project

Menglou Aqueduct of North Hubei Water Rersources Allocation Project is 4.99 km long with the design flow rate of 38 m3/s, for which the technologies of frictional pile foundation, hollow concrete gravity pier on bearing platform and large-span prestressed concrete aqueduct body are adopted due to the larger embedded depth of the foundation therein. Through a comparative analysis made on the span of the aqueduct, it is considered that the span of 30 m is more resonable to be adopted for the prestressed concrete aqueduct. Therefore, the impacts from stress deformation and environmental temperature under the operation conditions of all the load-combinations are analyzed for the prestressed rectangle concrete aqueduct with the span of 30 m, and then not only the reasonabilitied of the structural dimensions are certified, but the arrangement of prestressedreinforcement is also optimized.