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以某水电站带加劲环地面式钢衬钢筋混凝土管道为例,建立三维有限元模型,在分析其承载特性的基础上,论证了取消伸缩节的可行性。结果表明,在正常运行工况下,钢管以环向受拉为主;考虑温度变化后,环向应力基本不变,而轴向拉应力在温升作用下减小,在温降作用下增大;设伸缩节后,伸缩节附近钢管轴向应力的减小使其等效应力反而增大,且由于加劲环的约束和钢管与混凝土之间的摩擦作用,钢管并不随温度变化而自由伸缩,伸缩节起不到减小温度应力和适应不均匀沉降的作用,因此对于带加劲环的地面式钢衬钢筋混凝土管道建议不设伸缩节。
Taking a steel reinforced concrete reinforced concrete pipe with a stiffening ring in a hydropower station as an example, a three-dimensional finite element model is established, and on the basis of analyzing its bearing characteristics, the feasibility of canceling the telescopic joint is demonstrated. The results show that under normal operating conditions, the steel pipe is mainly tensioned in the circumferential direction. After considering the temperature change, the hoop stress is basically unchanged while the axial tensile stress decreases under the temperature increase. After the telescopic joint is set, the decrease of axial stress of the steel pipe near the telescopic joint increases its equivalent stress. Due to the restraint of the stiffening ring and the friction between the steel pipe and the concrete, the steel pipe does not freely contract with the temperature change , Telescopic section can not reduce the temperature stress and adapt to the effect of uneven settlement. Therefore, it is suggested that there is no telescopic section for the steel-lined reinforced concrete pipe with stiffener ring.