摘要
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。
Aiming at the safety problem of Yangjiaba aqueduct caused by long span, the method of initial strain is adopted to apply the prestress force, Considering eleven combination operating conditions of the aqueduct in operation process, three-dimensional finite element method is used to analyze the stress and deformation of the aqueduct. The stress and displacement rules of the aqueduct are obtained. The results show that the deflection and displacement of aqueduct are small to meet the existing standard requirements; aqueduct body is generally in the compressive stress state and the maximum compressive stress is less than the allowable value of the concrete; but in the temperature drop and summer sunshine conditions, the maximum tensile stress is significantly more than the allowable value of the concrete; thus it suggests that a bunch of PC strand supplement to the slot on each side of the body.
出处
《水电能源科学》
北大核心
2011年第7期89-92,共4页
Water Resources and Power
关键词
预应力
应力
位移
强度
刚度
杨家坝渡槽
prestress
stress
displacement
strength
stiffness
Yangjiaba aqueduct
