垫层蜗壳结构中钢板焊缝构造对传力行为的影响

发布时间：2018-02-01 00:28

本文关键词： 水电站厂房蜗壳垫层接触传力滑移削坡　出处：《华中科技大学学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：针对大中型水电站钢蜗壳焊缝处的削坡构造使钢衬与混凝土的接触面具有非平滑的特点,以拉西瓦水电站垫层蜗壳结构的某子午断面为例,分别采用平面轴对称壳单元和实体单元描述钢衬并建立相应的数值模型,研究了非平滑接触面对钢衬-混凝土间的滑移及传力行为的影响.计算结果表明:下半部钢衬向腰线端的滑移会受到削坡构造的阻滞作用,削坡构造附近会交替出现局部脱空区和集中传力区.在考虑了接触面的非平滑特点后,钢衬与混凝土之间传力水平的提高并不明显(5%以内),这说明当前采用壳单元描述钢衬的常用简化处理方式对于结构设计是适宜的.
[Abstract]:In view of the non-smooth interface between steel lining and concrete due to the sloping structure at the weld seam of steel spiral case of large and medium-sized hydropower stations, a meridian section of cushion volute structure of Laxiwa Hydropower Station is taken as an example. The plane axisymmetric shell element and the solid element are used to describe the steel lining and the corresponding numerical model is established. The influence of non-smooth contact on the slip and force transfer behavior between steel lining and concrete is studied. The results show that the slip of the lower half steel liner to the waist is blocked by the slope cutting structure. In the vicinity of slope cutting structure, there will be local void area and concentrated force transfer area alternately. After considering the non-smooth characteristics of the contact surface, the increase of the force transfer level between steel lining and concrete is not obvious less than 5%). This indicates that the current simplified treatment of steel lining described by shell element is suitable for structural design.
【作者单位】：长江科学院水利部水工程安全与病害防治工程技术研究中心;武汉大学水资源与水电工程科学国家重点实验室;
【基金】：国家自然科学基金资助项目(51679013;51309030;51609020;51679175;41301434) 武汉大学水资源与水电工程科学国家重点实验室开放研究基金资助项目(2015SDG02) 中央级公益性科研院所基本科研业务费资助项目(长江科学院CKSF2016015/GC;CKSF2015020/GC)
【分类号】：TV33
【正文快照】： 水电站蜗壳结构所受主要荷载为内水压力,通过钢衬-混凝土接触面上的挤压及摩擦作用向外传递.充水保压和铺设垫层两种蜗壳埋设工艺是通过在钢衬与混凝土的接触面上引入初始保压间隙或软垫层,在一定程度上对内水压力的外传行为进行调控.由于保压间隙或软垫层的介入,钢衬-混凝土

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