水利水电科技进展
水利水電科技進展
수이수전과기진전
ADVANCES IN SCIENCE AND TECHNOLOGY OF WATER RESOURCES
2015年
3期
42-46,118
,共6页
混凝土坝%损伤模型%多轴等效应变%工作性态
混凝土壩%損傷模型%多軸等效應變%工作性態
혼응토패%손상모형%다축등효응변%공작성태
concrete dam%damage model%multi-axis equivalent strain%working performance
基于混凝土单轴拉伸应力应变曲线模型和四参数等效应变，给出一种修正的四参数多轴等效应变损伤模型，通过与单轴拉伸、单轴压缩、双向拉伸、双向压缩、双向拉压以及三向压缩这6种受力状态的试验资料进行对比以验证其有效性。采用该多轴等效应变损伤模型对混凝土剪切试验组合受力情况、混凝土重力坝和混凝土拱坝等结构工作性态进行数值分析，得到静力荷载下的结构损伤和应力响应，评价了结构正常工作性能及安全性。结果表明，剪切试验数值模拟结果与试验成果吻合良好，可以对以剪切为主的组合受力情况进行分析，该模型适用于复杂应力状态下的计算；典型重力坝和拱坝损伤分布区域及应力分布规律合理，该模型可以对混凝土坝工作性态及其安全性进行分析。
基于混凝土單軸拉伸應力應變麯線模型和四參數等效應變，給齣一種脩正的四參數多軸等效應變損傷模型，通過與單軸拉伸、單軸壓縮、雙嚮拉伸、雙嚮壓縮、雙嚮拉壓以及三嚮壓縮這6種受力狀態的試驗資料進行對比以驗證其有效性。採用該多軸等效應變損傷模型對混凝土剪切試驗組閤受力情況、混凝土重力壩和混凝土拱壩等結構工作性態進行數值分析，得到靜力荷載下的結構損傷和應力響應，評價瞭結構正常工作性能及安全性。結果錶明，剪切試驗數值模擬結果與試驗成果吻閤良好，可以對以剪切為主的組閤受力情況進行分析，該模型適用于複雜應力狀態下的計算；典型重力壩和拱壩損傷分佈區域及應力分佈規律閤理，該模型可以對混凝土壩工作性態及其安全性進行分析。
기우혼응토단축랍신응력응변곡선모형화사삼수등효응변，급출일충수정적사삼수다축등효응변손상모형，통과여단축랍신、단축압축、쌍향랍신、쌍향압축、쌍향랍압이급삼향압축저6충수력상태적시험자료진행대비이험증기유효성。채용해다축등효응변손상모형대혼응토전절시험조합수력정황、혼응토중력패화혼응토공패등결구공작성태진행수치분석，득도정력하재하적결구손상화응력향응，평개료결구정상공작성능급안전성。결과표명，전절시험수치모의결과여시험성과문합량호，가이대이전절위주적조합수력정황진행분석，해모형괄용우복잡응력상태하적계산；전형중력패화공패손상분포구역급응력분포규률합리，해모형가이대혼응토패공작성태급기안전성진행분석。
A modified four-parameter multi-axis equivalent strain damage model is presented based on a typical uniaxial tensile stress-strain curve model and four-parameter equivalent strain. To verify the concrete damage model, test results under six kinds of stress states, including uniaxial tension, uniaxial compression, biaxial tension, biaxial compression, biaxaial tension-compression, triaxial compression are compared with experimental results. With the concrete damage model, this paper numerically analyzed combined force situations of concrete shear tests and working performances of concrete gravity dams and concrete arch dams. The damage and stress distribution of these structures under static loadings are obtained and analyzed. The results showed that the numerical simulation results of shear tests coincide with experimental results. Therefore, the model can analyze the combined force situation with the shear as the main force and the model is suitable for the calculation under complex stress states. In addition, the reasonable damage and stress distribution rules of typical gravity dams and arch dams indicated that the model could analyze the working performance and safety of concrete dams.
