| 摘要: |
| 【目的】研究2种不同体型拱坝在基本荷载和特殊荷载组合的几种工况下，拱坝结构各个部位的受力和位移情况，为拱坝在选型期体型的确定以及大坝运行期的极限承载力和破坏机理研究提供参考依据。【方法】应用大型有限元软件ANSYS建立拱坝三维有限元模型，模拟并分析方案1和方案2不同体型坝体在各个工况下的应力应变情况，利用有限元等效应力分析方法,对计算结果进行二次计算，以消除有限元计算中出现的应力集中现象。【结果】2种不同体型坝体在工况1条件下，除第1主拉应力外，其他部位均满足基本荷载组合的拉应力控制标准，第3主压应力均满足基本荷载组合的压应力控制标准；使用等效应力法计算后，方案1左右坝肩的应力集中范围由高程1 134～1 146 m变为高程1 119～1 146 m。【结论】拱坝的坝体体型可以同时通过改变拱圈中心角和半径使坝体变薄，在满足坝体稳定的前提下，小圆心角薄体拱坝坝型受力状态更好，不仅能充分发挥材料的抗压性能，还能有效的减小坝体位移及拉应力区范围,可以满足工程运行需求，并符合应力控制标准的规定。 |
| 关键词: 拱坝 拱圈厚度 应力应变 有限元 等效应力 |
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| 基金项目:陕西省重点学科建设专项（106-00X9030）;陕西省自然科学基金项目（2012JQ7008 ） |
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| Simulation of capacity for arch dam with different ring thickness using equivalent stress method |
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| Abstract: |
| 【Objective】This paper studied the structure stress and displacement of two arch dams under basic load and special load combination of several conditions.【Method】Large-scale finite element software ANSYS was used to establish three dimension finite element model of arch dam,simulate and analyze he stress and strain of dam in different operating modes.The finite element analysis method of equivalent stress was used to do verification calculation and analysis to eliminate the problem of stress concentration.【Result】Under condition one,all parts of both dams met the he basic load combination of tensile stress control standard except the first principal tensile stress and third principal compressive stress met the basic load combination stress control standard.Application of equivalent stress calculation,the concentration range of left and right dam shoulders for plan one changed from 1 134-1 146 m to 1 119-1 146 m. 【Conclusion】The dam body can thin the dam body by changing the center arch angle and radius to be thinner.The dam body with small central angle thin arch dam has better stress state,not only can give full play to the compressive properties of materials and reduce the displacement and tensile stress area of dam,but also can meet the requirements of stress control. |
| Key words: arch dam arch ring thickness stress and strain finite element equivalent stress |
