| 摘要: |
| 【目的】研究垫层与面板之间的接触约束对面板干缩应力的影响。【方法】根据一般外荷载作用下的接触摩擦单元理论,建立了面板堆石坝混凝土面板与垫层之间接触面干缩应力的有限元计算模型。基于该计算模型,结合工程实例,分析计算了施工期混凝土面板的干缩应力。【结果】面板混凝土浇筑结束时及蓄水前,其表面和中心的干缩应力均为拉应力,且表面各节点的干缩应力大于中心各节点的干缩应力;蓄水前面板干缩应力的峰值较浇筑结束时明显增大。【结论】算例计算分析表明,应用所建立的模型可以获得较为准确合理的接触面干缩应力计算结果。 |
| 关键词: 水工结构 混凝土面板 接触摩擦 干缩应力 接触面 |
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| 基金项目:陕西省教育厅科学研究计划项目（03JK098） |
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| Research on shrinkage stress of concrete slabs with contact friction |
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| Abstract: |
| 【Objective】 The research studied the effect of contact restriction between cushion and face slab Panels on the shrinkage stress.【Method】 Based on the theory of contact friction element with normal outer loads,the FEM calculation model of shrinkage stress of interface between slabs and cushion layer was established.On the basis of the model,this paper presented an example to analyze the shrinkage stress of concrete slabs during the construction period.【Result】 The result from the example indicated that the shrinkage stresses of surface and center of slabs were both tensile stress in the end of concrete placement and before the water storage of reservoir,also the shrinkage stress of surface was larger than that of center.The maximum value of shrinkage stress of slabs before water storage increased obviously compared with that in the end of concrete placement.【Conclusion】 The example shows that quite reasonable calculation result of shrinkage stress on interface can be obtained by the model. |
| Key words: hydro-structure concrete slab contact friction shrinkage stress interface |
