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时间:2019-02-14
《剪弯段开双孔钢筋混凝土梁受力性能的试验研究》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、学兔兔www.xuetutu.com2015年第5期(总第307期)混凝土理论研究Number5in2015(TotalNo.307)ConcreteTHE0RETICALRESEARCHdoi:10.3969~.issn.1002—3550.2015.05.008剪弯段开双孔钢筋混凝土梁受力性能的试验研究李志奇,袁广林,邱辉。(1.中国矿业大学力学与建筑工程学院,江苏徐州221116;2.中南控股集团,北京100142)摘要:基于剪弯段开双孔钢筋混凝土梁受力的特点,考虑了孔洞数量、间距和位置的因素,对剪
2、弯段开双孔梁在集中荷载作用下的受力性能进行了试验研究。研究结果表明,与未开孔钢筋混凝土梁相比,未加固开孔梁的承载力随着孔洞数量、间距和位置的变化有不同程度的降低。当孑L洞位置靠近支座时,单孔梁、孔间距小于1倍孑L径的双孑L梁和孔间距大于1倍孔径的双孔梁的承载力分别降低了12.7%、23.3%、16.8%,破坏时梁底部钢筋均未发生屈服,呈剪压破坏状态。当孔洞位置靠近纯弯段时,孔间距小于1倍孔径的双孔梁承载力降低了6.6%,破坏时呈弯曲破坏状态;开孔梁孔周钢筋加固后的承载力与未开孔梁相比仅下降3.1%,加固效
3、果明显,呈弯曲破坏状态。关键词:混凝土;开孔梁;双孔;钢筋加固;受力性能中图分类号:TU528.01文献标志码:A文章编号: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
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