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1、第34卷第2期長安大學(xué)學(xué)報(bào)(自然科學(xué)版)Vo1.34NO.22014年3月JournalofChang’anUniversity(NaturalScienceEdition)Mar.2O14文章編號(hào):167l-8879(2O14)02—0071—08砌體結(jié)構(gòu)地震倒塌過程仿真及抗倒塌影響因素李英民,譚潛,湯蕓,周小龍,鄭妮娜(1.重慶大學(xué)土木工程學(xué)院,重慶400045;2.重慶大學(xué)山地城鎮(zhèn)建設(shè)與新技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室,重慶400045)摘要:在強(qiáng)震中砌體房屋易倒塌,為了對其倒塌過程仿真及對影響結(jié)構(gòu)倒塌的因素進(jìn)行分析,用顯式動(dòng)力有
2、限元軟件ANSYS/LS—DYNA,對某結(jié)構(gòu)模型進(jìn)行倒塌過程仿真;同時(shí)分析了構(gòu)柱、砂漿強(qiáng)度、開洞率、塊體密度以及窗間墻與窗下墻的剛度比等因素對砌體結(jié)構(gòu)抗倒塌性能的響。結(jié)果表明:在地震作用下,由于門窗洞口處易出現(xiàn)應(yīng)力集中,故門窗洞口四角處先發(fā)生破壞;造柱可以提高砌體結(jié)構(gòu)的變形能力和整體性;一定程度上,砂漿強(qiáng)度越高,結(jié)構(gòu)越難倒;墻體開洞越大,越容易倒塌;塊體強(qiáng)度一定時(shí),密度相對較小有利于抗倒塌;當(dāng)窗間墻與窗下墻的剛度比小1.0時(shí),窗問墻先于窗下墻破壞,窗間墻的破壞會(huì)加速結(jié)構(gòu)的倒塌。關(guān)鍵詞:結(jié)構(gòu)工程;砌體結(jié)構(gòu);仿真分析;抗倒塌性能;
3、構(gòu)造柱;ANSYS/LS—DYNA中圖分類號(hào):TU472文獻(xiàn)標(biāo)志碼:ASimulationoncollapseprocessandanalysisofanti’collapseinfluencingfactorsformasonrystructureunderearthquakeLIYing—min,TANQian,TANGYun,ZHOUXiao—long,ZHENGNi—na’(1.SchoolofCivilEngineering,ChongqingUniversity,Chongqing400045,China;2.Ke
4、yLaboratoryofNewTechnologyforConstructionofCitiesinMountainAreaoftheMinistryofEducation,Cho采ngq造ing影Univ構(gòu)ersi率ty,C于hongqing400045,China)Abstract:Ithasbeenobviousthatmasonrystructuresarepronetocollapseinstrongearth—quakes.Simulatingcollapseprocessandanalyzinganti—col
5、lapseinfluencingfactorsformasonrystructureissignificant.TheexplicitdynamicFEsoftwareANSYS/LS—DYNAwasadoptedtosimulatecollapseprocess.Meanwhile,theeffectsoftie—column,mortarstrength,blockdensity,therateofholes,thestiffnessratioofwindowwalltospandrelwallonanti—collaps
6、eperformanceofmasonrystructurewereanalyzed.Theresultsshowthatthecornersofwindowsanddoorswil1bedamagedatfirstwherethestressconcentrationoccursundertheactionofearthquake;deform—ationcapacityandintegrityofmasonrystructurecanbeimprovedbytie—columns;tosomeextent,thehighe
7、rthestrengthofmortar,theharderthecollapseofstructure;thestructureiseasytocollapsewhiletheratioofholesonthewailsbecomesbiggerandbigger.Fortheblockswithcer—tainstrength,thesmallerthedensity,thebettertheseismiccapacity.Whenthestiffnessratioof收稿日期:2ol3一O4一lO基金項(xiàng)目:國家科技支撐計(jì)
8、劃項(xiàng)目(2oO9BAJ28BO1—02);中央高?;究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(CDJXS11201167,CDJXS11200010)作者簡介:李英民(1968一),男,山東無棣人,教授,工學(xué)博士,E—mail:liyingmin@cqu.edu.cn。72長安大學(xué)學(xué)報(bào)(自然