依托引江济淮工程淠河总干渠渡槽工程,对110 m世界最大跨度钢渡槽,采用数值计算和现场试验相结合的方法,对跨运河钢桁架梁拱组合体系新型钢渡槽结构的力学性能进行评价。首先,通过现场充水试验,对承受超级可变水荷载的钢渡槽结构关键截面应变和变形进行重点监测,比较监测数据与数值计算结果,分析评价结构静力性能。其次,通过现场脉动试验测试不同水位下结构的自振频率,并与数值分析结果对比,分析评价结构动力性能。充水试验结果表明,淠河总干渠新型钢渡槽处于安全状态,承载力满足设计要求。研究成果可为类似工程提供技术参考。

In this paper,the mechanical properties of the new steel aqueduct structure with steel truss beam-arch composite system across the canal are evaluated by means of numerical calculation and field test.The studied 110-metre steel aqueduct of Pihe River main canal of the Hanjiang-Weihe River Water Diversion Project has the largest span in the world.First,the strain and deformation of the key sections of the steel aqueduct structure under super varying water load are monitored through field water filling test,and the static performance of the structure is analyzed and evaluated by comparing the monitoring data with the numerical calculation results.Second,the natural vibration frequency of the structure under different water levels is tested by field pulsation test,and later compared with the numerical analytical results.The dynamic performance of the structure is also analyzed and evaluated.The results of water filling test demonstrate that the new steel aqueduct of Pihe main canal is in safe condition and the bearing capacity meets the design requirements.The research results could serve as a technical reference for similar projects.