南水北调沙河渡槽预应力结构设计与配筋优化  

Pre-stressed structure design and optimized layout of steel bars for Shahe aqueduct of Middle Route Project of South-to-North Water Diversion

作　　者：张玉明 张高伟[2] 刘国龙 冯光伟 

机构地区：[1]河南省水利勘测设计研究有限公司,河南郑州450016 [2]南水北调中线干线工程建设管理局河南直管建管局,河南郑州450046

出　　处：《人民长江》2013年第16期9-11,共3页Yangtze River

基　　金："十一五"国家科技支撑计划重大项目"南水北调工程若干关键技术研究与应用之大流量预应力渡槽设计和施工技术研究"(2006BAB04A05);南水北调中线干线工程科技项目"大型预应力U形预制槽1:1原型试验和预应力张拉试验研究"(ZXJ/KY/YYL-001)

摘　　要：南水北调中线沙河渡槽为预应力U形渡槽,采用结构力学法初步配制该渡槽预应力筋,在叠加温度荷载后用三维有限元法进行复核。当考虑到实测的钢绞线预应力损失后,槽身局部出现了拉应力,不符合相关规范要求。为此,通过减少底部纵向钢铰线,略微增加顶部纵向钢绞线,略微增大槽端部环向钢绞线间距,同时加密跨中环向钢绞线布置,使槽身在各工况下均不出现拉应力。上述优化措施,在仅增加很少工程量的情况下,确保了渡槽的安全及施工工期。In the design process of Shahe aqueduct, a U - shape pre - stressed aqueduct in Middle Route Project of South - to - North Water Diversion, structural mechanics was applied to preliminarily calculate the layout of pre - stressed tendons, and then the calculation was checked by 3D FEM after thermal load is considered. For solving the local tension stress found on the aqueduct due to pre -stress loss of steel strands, a set of adjusting measures were adopted as follows： reducing bottom longitudinal strand while increasing top longitudinal strand slightly, and extending the space of transverse strand at two sides of the aqueduct slightly while concentrating transverse strand at middle span of the aqueduct slightly. The presented measures can eliminate tension stress on the aqueduct in all cases, thus strengthening the aqueduct safety and shortening the construction period, and only a small increment of investment is required.

关 键 词：预应力筋 预应力损失 U形渡槽 南水北调中线工程 

分 类 号：TV672.3[水利工程—水利水电工程]