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1、學(xué)兔兔www.xuetutu.com2015年第5期(總第307期)混凝土理論研究Number5in2015(TotalNo.307)ConcreteTHE0RETICALRESEARCHdoi:10.3969~.issn.1002—3550.2015.05.008剪彎段開(kāi)雙孔鋼筋混凝土梁受力性能的試驗(yàn)研究李志奇,袁廣林,邱輝。(1.中國(guó)礦業(yè)大學(xué)力學(xué)與建筑工程學(xué)院,江蘇徐州221116;2.中南控股集團(tuán),北京100142)摘要:基于剪彎段開(kāi)雙孔鋼筋混凝土梁受力的特點(diǎn),考慮了孔洞數(shù)量、間距和位置的因素,對(duì)剪
2、彎段開(kāi)雙孔梁在集中荷載作用下的受力性能進(jìn)行了試驗(yàn)研究。研究結(jié)果表明,與未開(kāi)孔鋼筋混凝土梁相比,未加固開(kāi)孔梁的承載力隨著孔洞數(shù)量、間距和位置的變化有不同程度的降低。當(dāng)孑L洞位置靠近支座時(shí),單孔梁、孔間距小于1倍孑L徑的雙孑L梁和孔間距大于1倍孔徑的雙孔梁的承載力分別降低了12.7%、23.3%、16.8%,破壞時(shí)梁底部鋼筋均未發(fā)生屈服,呈剪壓破壞狀態(tài)。當(dāng)孔洞位置靠近純彎段時(shí),孔間距小于1倍孔徑的雙孔梁承載力降低了6.6%,破壞時(shí)呈彎曲破壞狀態(tài);開(kāi)孔梁孔周鋼筋加固后的承載力與未開(kāi)孔梁相比僅下降3.1%,加固效
3、果明顯,呈彎曲破壞狀態(tài)。關(guān)鍵詞:混凝土;開(kāi)孔梁;雙孔;鋼筋加固;受力性能中圖分類(lèi)號(hào):TU528.01文獻(xiàn)標(biāo)志碼:A文章編號(hào):1002—3550(2015)05—0029—05StudyonmechanicalpropertiesofreinforcedconcretebeamswithdoubleholesonshearbendingregionLJZ^,YUANGuanglin,QtUHu/(1.SchoolofMechanicsandCivilEngineering,ChinaUniversityof
4、MiningandTechnology,Xuzhou221116,China;2.ZhongnanGroup,Beijing100142,China)Abstract:Ithadfocusedonthemechanicalpropertiesofbeamsdouble—。holesonshear—-bendingregionundertheactionofconcen—tratedload,consideringthenumberofholes,distanceandpositionfactors,ana
5、lyzingthemechanicalpropertiesofbeamsdouble—holesonshear—bendingregionundertheactionofconcentratedload.TheresultsshowthatcomparedwithRCbeamwithnoopening,withthedifferentnumberofholes,distanceandposition,thebeatingcapacityofthebeamswithholesandnoreinforcedh
6、avedifferentde—greesofdecfine.Whenthepositionoftheholesnearthesupport,thebeamhole,theholesspacingoflessthanonetimesthediameterofthebeamandtheholesspacingofmorethanonetimesthediameterofthebeambeatingcapacitydecreased12.7%,23.3%,16.8%.Thebottomsteelofbeamsd
7、oesnotyieldandperformanceofshearcompressionfailurestate,whenthepositionoftheholenearthepurebendingsection.theholesspacingoflessthanonetimesthediameterofthebeambearingcapacitydecreased6.6%.performanceofBendingfailurestate.ComparedwithRCbeamwithnoopening,th
8、ebearingcapacityofthebeamsdouble—holeswithsteelreinforce—meritdecreased3.1%。thereinforcementeffectisobvious.performanceofbendingfailurestate.Keywords:s~engthconcrete;beamwithopening;doubleholes;steelreinforcement;me