价值工程
價值工程
개치공정
VALUE ENGINEERING
2015年
25期
119-123
,共5页
单层球面网壳%TAFT波%广义应变能密度%对数应变能密度%有限元
單層毬麵網殼%TAFT波%廣義應變能密度%對數應變能密度%有限元
단층구면망각%TAFT파%엄의응변능밀도%대수응변능밀도%유한원
single-layer latticed dome%TAFT wave%GSED%LSED%FEA
为了给出一个较为合理的强震作用下单层球面网壳结构失效荷载的判断准则,以便指导工程设计。首先对单层球面网壳结构的广义应变能密度(GSED)及对数应变能密度(LSED)与加速度峰值的关系进行理论推导,给出二者的表达式,奠定判断结构进入弹塑性分界点和失效的理论基础。然后,应用Ansys10.0对九个单层球面网壳在TAFT波作用下的动力反应进行全过程响应分析,并时时提取每级动荷载峰值下的所有单元的应变能密度及其他部分特征参数。在此基础上,绘制GSED和LSED与加速度峰值的关系曲线,依据曲线上的特征点判断网壳的弹塑性分界点及失效荷载。最后,与现有判断准则进行对比。
為瞭給齣一箇較為閤理的彊震作用下單層毬麵網殼結構失效荷載的判斷準則,以便指導工程設計。首先對單層毬麵網殼結構的廣義應變能密度(GSED)及對數應變能密度(LSED)與加速度峰值的關繫進行理論推導,給齣二者的錶達式,奠定判斷結構進入彈塑性分界點和失效的理論基礎。然後,應用Ansys10.0對九箇單層毬麵網殼在TAFT波作用下的動力反應進行全過程響應分析,併時時提取每級動荷載峰值下的所有單元的應變能密度及其他部分特徵參數。在此基礎上,繪製GSED和LSED與加速度峰值的關繫麯線,依據麯線上的特徵點判斷網殼的彈塑性分界點及失效荷載。最後,與現有判斷準則進行對比。
위료급출일개교위합리적강진작용하단층구면망각결구실효하재적판단준칙,이편지도공정설계。수선대단층구면망각결구적엄의응변능밀도(GSED)급대수응변능밀도(LSED)여가속도봉치적관계진행이론추도,급출이자적표체식,전정판단결구진입탄소성분계점화실효적이론기출。연후,응용Ansys10.0대구개단층구면망각재TAFT파작용하적동력반응진행전과정향응분석,병시시제취매급동하재봉치하적소유단원적응변능밀도급기타부분특정삼수。재차기출상,회제GSED화LSED여가속도봉치적관계곡선,의거곡선상적특정점판단망각적탄소성분계점급실효하재。최후,여현유판단준칙진행대비。
In order to establish a reasonable accurate criterion for judging the structural failure load of the single-layer latticed dome under severe earthquake, this paper firstly deduces the expressions of the General Strain Energy Density (GSED) and Logarithmic Strain Energy Density (LSED) for the dome with original defect relating with seismic acceleration pean, which lays a theoretical foundation for judging the elastic-plastic point and failure load of single-layer latticed dome. Then, using the program Ansys 10.0, it calculates the whole seismic response process of nine single-layer latticed domes and simultaneously extracts the strain energy density of all elements and other character response parameters. Next, the relationship among GSED, LSED and peak acceleration are plotted based on the above work which reveals that the elastic-plastic point and failure of the single-layer latticed domes. Finally, the new method is compared with the existing criterion.