南流江预应力连续梁式渡槽抗震性能

Seismic performance of pre-stressed continuous girder-type aqueduct in Nanliu River

预应力连续梁式渡槽具有整体受力条件好、施工工艺成熟且方便的优势,在实际工程中运用广泛,其具有良好的抗震性能是保证工程安全运行的关键。以采用预应力连续梁式渡槽形式的南流江大渡槽为例,通过Midas-civil分析软件建立有限元模型并施加拟合生成的地震波,对渡槽的抗震性能进行研究。结果表明,在拟合生成的地震波与场地类别、分区特征周期相近的人工地震波E1、E2作用下,南流江大渡槽的顺桥向及横桥向的桥墩强度验算和变形均满足要求,具有安全可靠的抗震性能。

Pre-stressed continuous girder-type aqueduct is widely used in actual projects,which has the advantages of good overall stress condit ions,mature and convenient construction technology.Its good seismic performance is the key to ensure the safe operation of the project.The pre-st ressed continuous girder-type aqueduct in the Nanliu River is taken as an example.The seismic performance of the aqueduct was investigated by making a finite element model and applying the fitted generated seismic waves through Midas-civil analysis software.The analysis results show that the artificial seismic waves E1 and E2 are similar to the site category and zoning characteristic period,which are generated by fitting and act on the aqueduct.The st rength calculat ion and deformation of the piers in the downst ream and cross-bridge directions of the Nanliu river aqueduct meet the requirements,and have safe and reliable seismic per formance.