CAJ | 학술논문

研究了采用有限元法进行重力坝应力分析时扬压力的施加方式不同对坝体应力值及其分布的影响。基于重力坝为静定结构、水平截面上不同分布方式的应力的合力相等的原则，采用有限元法对比分析了扬压力作为面荷载作用在坝基面，以及将扬压力沿坝基面向上对折作为体力考虑两种情况下水平截面上的应力分布和合力，然后与材料力学法计算的水平截面上的合力进行对比。分析认为，采用有限元法进行重力坝应力分析时，将扬压力沿坝基面向上对折作为体力考虑时，其计算的水平截面的内力与材料力学法计算的截面内力接近；但在靠近坝基面附近1/3坝高范围内的垂直向正应力和剪切应力分布不一样，另外，水平向正应力分布差异较大。
연구료채용유한원법진행중력패응력분석시양압력적시가방식불동대패체응력치급기분포적영향。기우중력패위정정결구、수평절면상불동분포방식적응력적합력상등적원칙，채용유한원법대비분석료양압력작위면하재작용재패기면，이급장양압력연패기면향상대절작위체력고필량충정황하수평절면상적응력분포화합력，연후여재료역학법계산적수평절면상적합력진행대비。분석인위，채용유한원법진행중력패응력분석시，장양압력연패기면향상대절작위체력고필시，기계산적수평절면적내력여재료역학법계산적절면내력접근；단재고근패기면부근1/3패고범위내적수직향정응력화전절응력분포불일양，령외，수평향정응력분포차이교대。
This paper studied the exerting method of uplift pressure when adopting the FEM to analyze the stress for gravity dam. Based on the prin-ciple that,gravity dam is statically determinate structure and different exerting methods have the same resultant force,adopted the FEM to do a con-trastive analysis about the stress distribution and the resultant force in two cases,setting the uplift pressure as face load on the foundation surface and folding up uplift pressure along foundation surface as the buoyancy,and then,compared with the resultant force that calculated by materials mechanics. The analysis shows that when adopting the FEM to do the stress analysis,folding up the uplift pressure as buoyancy,the calculated in-ternal forces approach to the forces that calculated by material mechanics. While the distributions of normal stress in vertical and the sheer stress are different within 1 / 3 dam height near the foundation surface,in addition distributions of normal stress in horizontal are quite different.