水力发电
水力髮電
수력발전
WATER POWER
2014年
12期
26-30
,共5页
混凝土坝%动力损伤模型%多轴等效应变%等效应变率%工作性态
混凝土壩%動力損傷模型%多軸等效應變%等效應變率%工作性態
혼응토패%동력손상모형%다축등효응변%등효응변솔%공작성태
concrete dam%dynamic damage model%multi-axis equivalent strain%equivalent strain rate%working performance
基于混凝土典型单轴动力应力应变曲线，考虑强度和弹性模量的应变率效应，建立了一种单轴动力损伤模型，通过与单轴拉、压试验结果对比验证其有效性。在此基础上结合等效应力、等效应变、等效应变率，提出了一种多轴等效应变动力损伤模型，并将该损伤模型应用于混凝土剪切试验、典型混凝土重力坝、拱坝的数值分析，得到地震荷载下结构损伤和应力响应，评价了结构动力性能及安全性，为混凝土坝动力安全分析提供了一条有效途径。
基于混凝土典型單軸動力應力應變麯線，攷慮彊度和彈性模量的應變率效應，建立瞭一種單軸動力損傷模型，通過與單軸拉、壓試驗結果對比驗證其有效性。在此基礎上結閤等效應力、等效應變、等效應變率，提齣瞭一種多軸等效應變動力損傷模型，併將該損傷模型應用于混凝土剪切試驗、典型混凝土重力壩、拱壩的數值分析，得到地震荷載下結構損傷和應力響應，評價瞭結構動力性能及安全性，為混凝土壩動力安全分析提供瞭一條有效途徑。
기우혼응토전형단축동력응력응변곡선，고필강도화탄성모량적응변솔효응，건립료일충단축동력손상모형，통과여단축랍、압시험결과대비험증기유효성。재차기출상결합등효응력、등효응변、등효응변솔，제출료일충다축등효응변동력손상모형，병장해손상모형응용우혼응토전절시험、전형혼응토중력패、공패적수치분석，득도지진하재하결구손상화응력향응，평개료결구동력성능급안전성，위혼응토패동력안전분석제공료일조유효도경。
A dynamic uniaxial damage model is established based on a typical uniaxial tensile stress-strain curve and strain rate effect of strength and elastic modulus, and the results of model calculation are compared with the results of uniaxial tension and compression tests of concrete to verify the model. Then an amended dynamic multi-axis equivalent strain damage model is given based on the uniaxial model and equivalent stress, equivalent strain and equivalent strain rate. The amended model is used to study three typical concrete structures of concrete shear test, concrete gravity dam and concrete arch dam. The damage and stress distribution of these structures under seismic loading are given and analyzed. Based on the analysis results, the working performance and safety of these structures are evaluated. The results indicate that the dynamic damage model is an effective way to study the working performance and safety of concrete dams.
