Experimentalassessmentoftheseismicperformanceofaprefabricatedconcretestructuralwallsystem预制混凝土结构墙系统抗震性能的试验评估
AlbertoPavesea,DionysiosA.Bournasb,?
aDepartmentofStructuralMechanics,UniversityofPavia,ViaFerrata1,Pavia(PV),Italy
bEuropeanLaboratoryforStructuralAssessment,IPSC,JRC,EuropeanCommission,T.P.,I-Ispra(VA),Italy
Abstract
Inthisstudytheauthorsinvestigatedexperimentallythebehaviourofprefabricatedreinforcedconcretesandwichpanels(RCSPs)undersimulatedseismicloadingthroughalargeexperimentalcampaign.Testswerecarriedoutonsinglefull-scalepanelswithorwithoutopenings,simulatingthebehaviouroflateralresistingcantileverandfixed-endwalls.Testswerealsocarriedoutona2-storeyfull-scaleH-shapedstructureconstructedbyindividualpanelswhichwereproperlyjoinedtogether.Theperformanceandfailuremodeofallpanelstestedrevealedstrongcouplingbetweenflexureandshearduetothesquat-typegeometryofthepanels.Howeverduetotheirwell-detailedreinforcement,allpanelsexhibitedonlyarelativelygradualstrengthandstiffnessdegradationandinnocasedidanypanelsufferfromsuddenshearfailure.TheprefabricatedwallsofthestructuralsysteminvestigatedhereinseemtomeetalltherequirementsofEurocode8forwallstobedesignedas‘‘largelightlyreinforcedwalls’’;howeverthisassumptionshouldbesupportedwithfurtherexperimentalandanalyticalstudies.
Keywords:
Largelightlyreinforcedwalls;LightweightRCstructures;PrefabricatedstructuresSandwichpanels;Shearwalls;Seismicbehaviour
在这项研究中，作者通过大型试验活动对预制钢筋混凝土夹芯板（RCSP）在模拟的地震作用下的行为进行了研究。在带有或不带有开口的单个足尺面板上进行了测试，以模拟侧向抵抗悬臂墙和固定端墙的表现。还对通过合适节点连接在一起的单一面板构成的2层全尺寸H形结构进行了测试。测试的所有面板的性能和破坏模式均显示出其弯曲和剪切之间的强耦合，这归因于面板的下蹲式几何形状。然而由于其详细的配筋，所有面板仅表现出相对逐渐的强度和刚度下降，并且在任何情况下都不会遭受突然的剪切破坏。本文研究的预制墙结构系统似乎满足了Eurocode8对将墙设计为“大型轻质钢筋混凝土墙”的所有要求；但是，该假设应得到进一步的试验和分析研究的支持。
关键字：
大型轻质钢筋混凝土墙；轻质RC结构；预制结构夹芯板；剪力墙；地震行为
1.Introductionandbackground引言和背景
Mostcurrentdesigncodesofconcretebuildingsforearthquakeresistancegivelowervaluesofthebehaviourfactorqforwallsystemsthanforframesystems.Thisisattributedtoacoupleofreasons;shearwallshavelargecross-sectionallength?wandthusshearplaysasuperiorroleintheirseismicresponseandalsotheseismicbehaviourofthewallsystemsisnotsowellknownandunderstoodbecauseexperimentalandanalyticalresearchonwallsispracticallydifficult;sodesigncodestendtobeonthesafeside.Tomakemattersworse,whentheseismicperformanceofstructuresincorporatingprecastorprefabricatedconcretewallsasthemainlateralforceresistingsystemisconsidered,thisconservativenessmaybe