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1、DOI:10.14006/j.jzjgxb.2010.08.014第31卷第8期2010年8月建筑结构学报JournalofBuildingStructuresVol.31No.8Aug.2010013文章编号:1000-6869(2010)08-0094-07蒸压粉煤灰砖砌体应力-应变全曲线研究11,21,311秦士洪,倪校军,曹桓铭,骆万康,卢骥(1.重庆大学土木工程学院,重庆400045;2.中煤国际工程集团重庆设计研究院,重庆400016;3.四川省建筑科学研究院,四川成都610081)摘要:为了解蒸压粉煤灰砖砌体的受压变形特征,建立蒸压粉煤灰砖
2、砌体的本构关系,在标准试验方法基础上引入刚性元件,对6组共36个实心砖和多孔砖砌体短柱进行了轴心受压试验,得到试件在受压过程中的开裂及破坏形态、变形特征及特征值以及应力-应变全曲线。试验研究表明:蒸压粉煤灰砖砌体的受压破坏过程及特征与普通砖砌体类似,多孔砖砌体的破坏脆性较大;蒸压粉煤灰砖砌体的弹性模量值高于现行规范计算值;峰值压应变随抗压强度增高而增大;其受压本构关系可采用三段式来表达,上升段由直线段和曲线段组成,下降段为曲线段,与以往的砌体受压本构关系相比,其更接近实测数据。关键词:蒸压粉煤灰砖砌体;轴心受压;静力试验;变形特征;应力-应变全曲线;弹性
3、模量中图分类号:TU362TU522.35文献标志码:AResearchonstress-strainfullcurvesofautoclavedflyashbrickmasonry11,21,311QINShihong,NIXiaojun,CAOHengming,LUOWankang,LUJi(1.CivilEngineeringCollege,ChongqingUniversity,Chongqing400045,China;2.Sino-CoalInternationalEngineeringGroup,ChongqingDesign＆Resear
4、chInstitute,Chongqing400016,China;3.SichuanInstituteofBuildingResearch,Chengdu610081,China)Abstract:Inordertofindoutthedeformabilityandcharactersofcompressedautoclaveflyashbrickmasonryandestablishitsconstitutiverelationship,anexperimentalresearchwascarriedouton6-group(36specimens
5、inall)solidbrickandperforatedbrickmasonryshortcolumnsunderaxialcompression,whileadoptingtherigidelementbasedonthestandardtestmethod.Thecrackanddeformationcharacteristics,thefailuremodes,andthecompletestress-straincurveswereobtained.Theresearchresultsshowedthatthefailureprocessand
6、characteristicsoftheperforatedbrickmasonryshortcolumnsweresimilartothecommonbrickmasonry,buttheperforatedbrickmasonrytendedtofailinbrittlemanner.Theelasticmodulusoftheperforatedbrickmasonryislargerthanthevaluessuggestedinthepresentdesigncode.Thepeakcompressivestrainoftheperforate
7、dbrickmasonryincreasesalongwiththeincreaseofitscompressivestrength;thecompressiveconstitutiverelationshipoftheperforatedbrickmasonrycanbeexpressedina3-segmentcurvewithaascendingsectionincludingastraightsegmentandacurvesegment,andacurvedescendingsegment.Comparedwiththeconventional
8、constitutiverelationship,thiscurveisclos
