多層砌體結(jié)構(gòu)墻體的抗震剪切強(qiáng)度研究
劉西光1,王慶霖2
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劉西光1,王慶霖2(1 同濟(jì)大學(xué)建筑工程系, 上海 200092;2 西安建筑科技大學(xué), 西安 710055)[摘要] 試驗(yàn)表明蒸壓粉煤灰磚、加氣混凝土砌塊、混凝土多孔磚等新型砌體在剪壓復(fù)合受力下往往發(fā)生塊體斜向劈裂或斜壓破壞,《建筑抗震設(shè)計(jì)規(guī)范》(GB 50011-2010)中砌體的抗震剪切強(qiáng)度僅與砂漿強(qiáng)度有關(guān),已不能正確計(jì)算這類砌體的抗震剪切強(qiáng)度。針對(duì)剪壓復(fù)合受力下塊體劈裂(斜壓)破壞,依據(jù)最大主應(yīng)力破壞準(zhǔn)則給出了砌體剪壓抗剪強(qiáng)度計(jì)算公式。計(jì)算公式與試驗(yàn)結(jié)果吻合良好。剪壓復(fù)合受力下塊體劈裂(斜壓)破壞強(qiáng)度不僅與砌體的正應(yīng)力和砌體軸心抗壓強(qiáng)度比有關(guān),也與砌體的軸心抗拉、抗壓強(qiáng)度比有關(guān),為確定砌體的軸心抗拉強(qiáng)度,建議參照美國ASTM-E519標(biāo)準(zhǔn)進(jìn)行對(duì)角加載砌體劈裂試驗(yàn)。[關(guān)鍵詞] 砌體;抗剪強(qiáng)度;剪壓復(fù)合作用;破壞準(zhǔn)則;抗拉強(qiáng)度中圖分類號(hào):TU398-7 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1002-848X(2012)12-0112-05Study on seismic shear strength of wall for multi-story masonry structuresLiu Xiguang1, Wang Qinglin2(1 Department of Building Engineering, Tongji University, Shanghai 200092, China; 2 Xi′an University of Architecture and Technology, Xi′an 710055, China)Abstract: Tests show that in the masonry walls of autoclaved flyash-lime brick, sutolaved aerated concrete block and concrete perforated brick under the shear-compression action, the diagonal splitting and crushing failure mode of units usually occurreds. Seismic shear strength in the Code for seismic design of buildings (GB 50011-2010) depends only on the mortar strength, therefore the shear capacity of the above-mentioned masonry walls can not be estimated correctly. Aiming at the diagonal splitting and crushing failure mode of units under the shear-compression action, according to maximum principal stress failure criterion, the relevant formula for determination shear strength was established. The formula shows a good agreement with the experimental results. The ultimate shear strength of diagonal splitting and crushing failure of units not only depends on normal stress to compression strength ratio of masonry, but also depends on the axial tension strength to compression strength ratio. In order to define the axial tension strength of masonry, the diagonal tension (shear) test according to the code ASTM-E519 is suggested.Keywords: masonry; shear strength; shear-compression action; failure criteria; tension strength作者簡介:劉西光,博士研究生,Email:xiguang830@163.com參考文獻(xiàn)[1]王慶霖.無筋墻體的抗震剪切強(qiáng)度[C]//砌體結(jié)構(gòu)研究論文集.長沙:湖南大學(xué)出版社,1989.[2]劉桂秋,施楚賢,黃靚,等. 對(duì)砌體剪\|壓破壞準(zhǔn)則的研究[J]. 湖南大學(xué)學(xué)報(bào),2007,34(4):19-23.[3]蔡勇. 基于最小耗能原理的砌體抗剪強(qiáng)度統(tǒng)一模式[J]. 中南大學(xué)學(xué)報(bào),2007,38(5):994-999.[4]GB 50011-2010 建筑抗震設(shè)計(jì)規(guī)范[S]. 北京:中國建筑工業(yè)出版社,2010.[5]方亮. 蒸壓粉煤灰磚墻抗震抗剪強(qiáng)度及抗震性能試驗(yàn)研究[D]. 長沙:長沙理工大學(xué),2009.[6]韓春. 蒸壓粉煤灰磚柱及墻體抗震性能的試驗(yàn)研究[D]. 西安:西安建筑科技大學(xué),2009.[7]湛華. KP1型燒結(jié)頁巖粉煤灰多孔磚墻體抗震抗剪性能試驗(yàn)研究[D]. 長沙:湖南大學(xué),2001.[8]于敬海. 新型輕質(zhì)加氣混凝土承重砌體抗震性能的研究[D]. 天津:天津大學(xué),2008.[9]駱萬康, 朱希誠. 預(yù)應(yīng)力砌體房屋抗震性能與設(shè)計(jì)方法研究[R]. 重慶:重慶建筑大學(xué)建筑工程學(xué)院,1999.[10]蔡勇. 砌體在剪\|壓復(fù)合作用下抗震抗剪強(qiáng)度分析[J]. 建筑結(jié)構(gòu),2011,41(2):74-77.[11]YOKEL F Y, FATTAL S G. Failure hypothesis for masonry shear walls [J]. Journal of the Structural Division, ASCE,1976,102(3):515-532.[12]Uniform Building Code [S]. American Building Standard, 1997.[13]ASTM\|E 519-02 Standard test method for diagonal tension (shear) in masonry assemblages[S]. American National Standard, 1989.[14]BS_EN 1052-3-2002 Methods of test for masonry-Part 3: Determination of initial shear strength[S]. British Standard,2002.[15]李衛(wèi)波. 燒結(jié)頁巖多孔磚砌體抗剪強(qiáng)度及其應(yīng)變?cè)囼?yàn)研究[D]. 重慶:重慶大學(xué),2009.
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