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时间:2020-03-25
《强地震作用下混凝土重力坝响应特性分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、水利水电技术第47卷2016年第10期强地震作用下混凝土重力坝响应特性分析丁柱,张立翔(昆明理工大学建筑工程学院,云南昆明650500)摘要:研究了混凝土重力坝在高强度地震作用下的响应特性,分析了在地震峰值加速度不断增加时坝体屈服区域的发展方向。针对两个典型坝段,运用混凝土塑性损伤模型模拟了其结构的非线性特性。考虑了地震情况下动水压力的作用,通过动力有限元时程分析法计算了不同地震条件下两个坝段的动态响应。计算结果表明:"-3地震加速度较小时,重力坝只在坝踵区域出现小部分屈服,坝体能正常工作。若提高地震烈度,
2、则局部损伤会纵深发展到达灌浆廊道部位,坝体会形成贯穿上下游的屈服区域并逐渐扩大致使结构失去稳定性。经两个坝段计算结果相互比较,得到了混凝土重力坝在强震作用下的非线性破坏形式,较为真实地反映出坝体的响应。关键词:混凝土重力坝;强地震;塑性损伤模型;非线性分析;时程分析法;动态响应doi:10.13928/j.cnki.wFahe.2016.10.001中图分类号:TV311文献标识码:A文章编号:1000—0860(2016)10-0001—06Analysisonresponsecharacteristic
3、sofgravitydamunderstrongearthquakeeffectDINGZhu,ZHANGLixiang(FacultyofCivilandArchitecturalEngineering,KunmingUnivemityofScienceandTechnology,Kunming650500,Yunnan,China)Abstract:Theresponsecharacteristicsofconcretegravitydamunderhi【shintensityearthquakeiss
4、tudiedherein,andthenthedevelopingdirectionoftheyieldingareainthedambodyduringthecontinuousincreaseofthepeakseismicaccelerationisa11.a-lyzedaswell.Fortwotypicaldamsections,thenonlinearcharacteristicsofthestructuresaresimulatedwiththeconcreteplasticdamagemod
5、el.Undertheconsiderationoftheeffectofthedynamicwaterpressureunderearthquake,thedynamicresponsesofboththedamsectionsunderdifferentseismicconditionsflxecalculatedwiththedynamicfiniteelementtime·-historyanalysismeth··od.Thecalculationresultshowsthatwhenthesei
6、smicaccelerationissmaller.onlyasmallfractionofyieldOccur8attheheel小eaofthegravitydam,thusthedamCallnormallyoperated.Iftheseismicintensityisincreased,thelocaldamageistobedevel-opedtothegroutinggallery,andthenanupstreamtodownstreamyieldingareaistobeformedand
7、continuouslyenlarged,thusmakesthestructureloseitsstability.Thronghthecomparisonmadebetweenthecalculationresultsofbeththedamsectious,thenonlinearfailurepatternofconcretegravitydamunderstrongseimiceffectisobtained,whichmoretrulyreflectstheresponseofthedambod
8、y.Thestudyhasacertainreferencesignificancefortheseimiestudyongravitydam.Keywords:concretegravitydam;strongearthquake;plasticdamagemodel;nonlinearanalysis;timehistoryanalysismethod;dynamicrespouse我国的水能资源大部分分布在
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