Research Article Experimental Study on Influence of Connection Defects on Joint Strength of Half-Grouted Sleeve Splicing of Rebar Hong Guo , 1 Jiaxin Zhang, 1 and Changwei Wang 2 1 Civil Engineering, North University of China, Taiyuan, Shanxi, China 2 China Shanxi Sijian Group Co., Ltd., Taiyuan, Shanxi, China CorrespondenceshouldbeaddressedtoHongGuo;[email protected] Received 5 October 2019; Revised 14 May 2020; Accepted 26 May 2020; Published 13 June 2020 AcademicEditor:Jos´ eAguiar Copyright©2020HongGuoetal.isisanopenaccessarticledistributedundertheCreativeCommonsAttributionLicense, whichpermitsunrestricteduse,distribution,andreproductioninanymedium,providedtheoriginalworkisproperlycited. edifferenttypesofdefectsofhalfgroutingsleeveswillremarkablyincreasetherisksofprecastconcretestructures.Inorderto betterunderstandthedefectsofrebarconnectionsbetweenhalfgroutingsleeves,sixdifferenttestgroupsoninsufficientgrout height,insufficientcompactness,rebaroffset,insufficientrebaranchorlength,overtimegrouting,andcontrolgrouphadbeen researched. e uniaxial tension experiments were conducted for the 24 different specimens, and load-slip curves were also analyzed.eresultsoftheexperimentsshowedthattheoutsideoftherebarwassnappedoffasforthedestructionmode,while the destruction mode changed as the increment of the degree of defect surpasses the critical value. e bearing capacity and deformabilityweredroppedwiththeincreaseinthedegreeofdefects,andacriticalvalueofrebaranchoringlengthofsleevewas discovered.Intheend,differentfinite-elementmodelswerebuiltbasedondifferentdeficientsituations,andload-slipconstitutive modelwasobtained,whichwouldbehelpfultoevaluatethestructuralperformanceofprecastconcretestructuresinconstruction. 1. Introduction Precastconcrete(PC)structureiswidelyadoptedbecauseof its notable advantages such as high quality, high industri- alizationlevel,highconstructionspeed,lowlaborintensity, and green construction [1]. At present, the factors that influencetheassembledbuildingconstructionsafetymainly include node and structure designs. Grouted sleeve effec- tively solves the technical problems of node connection to precasttheconcretecomponent.Groutedsleeve,including whole-grouted sleeve and half-grouted sleeve [2], among which the rebar of one end of half-grouted sleeve was processedintoexternalstraightthreadconnectedtostraight threadinsleeveandtheotherendwasinsertedintosleeve cavity, was connected by injecting special joint grouting material,andthisprocessismorewidelyandconveniently adopted. Scholarsathomeandabroadhavedevelopedaseriesof researchesabouttheprefabricatedconcretestructures.Qin etal.[3]hadcomparedtheseismicresistanceofmonolithic precast concrete structure (MPCS) with cast-in-place structure (CIPS). e results show that, except for typical features, MPCS and CIPS generally have similar seismic responses and prove that they have better seismic perfor- mancewithoutcollapseunderhigh-intensityseismicwaves. Zhang et al. [4] studied and predicted the service life of precast concrete structures in chloride environment. e analysisshowsthattheinitialstateofcorrosionanduselimit statearesensibleofthechloridediffusioncoefficientwithin connecting area, and a higher pitting factor has obvious influenceonthebearingcapacitiesofPCstructures.Wutal. [5]presentedthecalculationmethodofthebendingresisted bearingcapacityofprecastgroutedshearwallinfluencedby nodedisplacements.Panetal.[6]strengthenedtheprecast reinforced frame to reduce the possibility of continuous collapsebyexternallystuckcarbonfibre-reinforcedpolymer (CFRP) sheets to hybrid fibre-reinforced polymer (HERP) anchors.ereinforceresultisextremelyevidentattheearly stage of catenary effect, and there is no shearing failure of HERP anchors, which prove the effectiveness of the an- choringmethod.Guoetal.[1]raisedasimplifiedcalculation method to predict the lateral strength of the precast shear Hindawi Advances in Civil Engineering Volume 2020, Article ID 5389861, 15 pages https://doi.org/10.1155/2020/5389861
Experimental Study on Influence of Connection Defects on Joint Strength of Half-Grouted Sleeve Splicing of Rebar
Jun 14, 2023
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Related Documents
