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1、外叶墙为非承重墙夹芯墙抗震性能探究摘要:对4片高度相同、高宽比和竖向压应力不同的夹芯墙进行了水平低周反复加载试验,研究了这种墙体构件的抗震性能•根据实际受力特点,试验中水平荷载与竖向荷载都加载于试件内叶墙的形心•观测了该墙体受力变形损伤裂缝屈服破坏的全过程;分析了该墙体的破坏特征、滞回曲线、骨架曲线、位移延性、承载力、拉接筋受力性能和内、外叶墙协同工作能力等•研究结果表明:由于拉接筋的作用,内、外叶墙协同工作性能良好,外叶墙在试验过程中破坏轻微;试验过程中出现剪切滑移和“捏缩效应”;内叶墙在高宽比较小时,呈现明显的剪切破坏,在高宽比较大时,呈现出弯剪
2、破坏;试件的承载力随着轴压比的提髙而增加.采用规范(GB50003-2001)中配筋砌体抗剪承载力平均值计算公式进行计算,结果较试验值小.关键词:低周反复加载试验;砌体结构;夹芯墙;配筋砌体;抗震性能中图分类号:TU365文献标识码:ASeismicBehaviorofSandwichWallsSubjectedtoCyclicLoadingontheCenteroftheInteriorWallsHUANGLiangl❷,YIChu❷junl,2,WUZhi❷weil,GA0Xiang3,CHENSheng❷yun4(1CollegeofCivil
3、Engineering,HunanUniv,Changsha,Hunan410082,China;2.JizhunFangzhongArchitecturalDesignAssociates,Chengdu,Sichuan610017,China;3.ShenzhenChinaOverseasConstruetionLtd,Shenzhen518001,China;4.ShenzhenGemdaleCorp,Shenzhen518048,China)Abstract:Experimentalstudiesoffoursandwichwallswith
4、thesameheightbutdifferentheight❷widthratioanddifferentverticalcompressivestress,whichweresubjectedtoin❷planecyclicloading,werepresentedandtestsresuItswerediscussed.Basedonactualmechanicalcharacteristics,theverticalandhorizontalloadswereloadedonthecenteroftheinteriorwalls.Thewho
5、leprocessof1oading❷deforming^damaging❷cracking❷yielding❷failurewasobservedduringthetest.Thefailurecharacteristics,hystereticcurves,skeletoncurves,displacementduetility,bearingcapacity,behaviorofthetiebarandcoordinationbetweentwocavitywallswereanalyzed.Theresultshowedthattheinte
6、riorwallsandtheouterwallsworkedtogetherwell,andtheouterwallswereslightlydamaged;shearslippingandpinchingoccurredinthetest;shearfailureoccurredwhentheratioofheighttowidthwassmallandbending❷shearfailureoccurredwhentheratioincreasedandtheultimatebearingcapacityofthewallsincreasedw
7、iththeincreaseoftheaxialcompressiveratio.TheshearcapacityofthewallsinthetestisgreatercomparedwiththeGB50003-2001Code.Keywords:cyclicloads;masonrystructure;sandwichwall;reinforcedmasonry;seismicperformance夹芯墙起源于北美、北欧等地区.这些地区的建筑外墙由两片墙体构成,并在墙体之间设置保温隔热材料和拉接件,即为复合节能墙体,在我国叫空腔墙或者夹芯墙•这
8、种墙体可采用不同材料的墙片相结合,如内、外叶墙都可采用混凝土砌块、实心砖、空心砖等材料,根据需要可自由搭配形