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针对杨家坝渡槽跨度较大导致的安全问题,采用初始应变法施加预应力,考虑了渡槽在运行过程中的11种工况,对渡槽结构应力与变形进行了三维有限元分析,得出了渡槽结构应力和位移的分布规律。结果表明,渡槽槽身位移和挠度较小,满足现行规范要求;槽身一般均处于压应力状态,且最大压应力小于混凝土容许值;在温降与夏季日照工况下槽身的最大拉应力明显超过混凝土容许值,建议在槽身两边各增加一束预应力钢绞线。
In view of the safety problem caused by the large span of Yangjiaba aqueduct, the initial strain method is used to prestress the aqueduct. Considering the 11 conditions during the aqueduct, three-dimensional finite element analysis of the stress and deformation of the aqueduct is made. Distribution of stress and displacement in aqueduct structure. The results show that the displacement and deflection of the aqueduct body are small and meet the requirements of current codes. The body of the aqueduct is generally in the state of compressive stress and the maximum compressive stress is less than the allowable value of concrete. The maximum tensile stress of the aqueduct under the condition of temperature drop and summer sunshine Significantly exceed the allowable value of concrete, it is proposed to add a bundle of prestressed strand on both sides of the body.