水电站引水系统钢岔管在动态水压作用下的应力分析与测试

Stress Analyses of Steel Branch for Water Power Station Diversion System under Action of Dynamic Water Pressure and Tests

水电站引水系统的关键部位——钢岔管的设计与制作一般采用传统的分析方法和施工工艺，在对消除焊接应力的影响很难准确测定的情况下采用对钢岔管的裸露状态进行有限元分析计算，且往往只对小型模型作静水压力试验用以校核．为进一步搞清钢岔管在工作状态下的实际受力情况，１９９５年９月我们对江西东津水电站引水系统钢岔管进行了有限元应力分析、焊接应力分析、一号机组工作状态下钢岔管应力测试工作．测试分析结果表明：现有设计存在较大的潜力，如果在设计上有所改进，可以节约大量投资，取得显著的经济效益．

At present, the key region of water power station diversion system in our country, the design and manufacture of steel branch, usually adopt traditional analysis method and construction technology. In the case of inaccurately measuring eliminated welding stress, the finite element computations are used to analyze naked steel branch, which are often compared with test data of small size model. In order to investigate the actual stress distribution of steel branch on work service, we performed finite element computation, welding stress analyses and made tests on the site of the steel branch under running of power machine No.1 for Jiangxi Dongjin Water Power Station Diversion System in September, 1995. The computation and test results show that the present design has great potentialities. If we make some modifications for the design, We can reduce the cost greatly and achieve high efficiency.