T形截面帶翼緣剪力墻剪滯效應(yīng)分析及有效翼緣寬度討論*
史慶軒，王斌，鄭曉龍，田建勃
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（西安建筑科技大學(xué)土木工程學(xué)院， 西安 710055）［摘要］對一T形截面帶翼緣剪力墻的應(yīng)力分布進(jìn)行了全過程模擬，驗證了剪力滯后現(xiàn)象的存在，研究了加載過程中剪滯效應(yīng)的發(fā)展規(guī)律，并討論了不同設(shè)計參數(shù)對剪滯效應(yīng)的影響。根據(jù)應(yīng)力等效原則，得出不同工況下有效翼緣寬度的取值，并與國內(nèi)外規(guī)范取值進(jìn)行了分析比較。結(jié)果表明，隨著荷載級數(shù)的增加，剪滯效應(yīng)逐漸增強(qiáng)，在構(gòu)件達(dá)到屈服時，剪滯效應(yīng)最明顯，有效翼緣寬度達(dá)到最小值。剪滯效應(yīng)隨軸壓比的增大而增強(qiáng)，隨剪跨比、長寬比的增大而減弱。Nehrp guidelines for the seismic rehabilitation of buildings(FEMA 273)關(guān)于有效翼緣寬度的取值比較合理，但是沒有足夠的安全儲備?！痘炷两Y(jié)構(gòu)設(shè)計規(guī)范》(GB 50010—2010)對于有效翼緣寬度的取值過于保守，造成材料浪費，甚至可能發(fā)生脆性破壞，因此對采用《混凝土結(jié)構(gòu)設(shè)計規(guī)范》(GB 50010—2010)進(jìn)行結(jié)構(gòu)構(gòu)件設(shè)計提出了一些實際建議。［關(guān)鍵詞］帶翼緣剪力墻; 剪滯效應(yīng); 數(shù)值模擬; 影響因素; 有效翼緣寬度中圖分類號：TU375 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2014)22-0067-05Shear lag effect analysis and effective flange width study of the T-shaped shear wall with flangeShi Qingxuan, Wang Bin, Zheng Xiaolong, Tian Jianbo(School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China)Abstract:The stress distribution of the T-shaped shear wall with flange was simulated in the whole process and the existence of shear lag effect was verified. Then the development regularity of shear leg effect in the loading process was investiagted and the influences of different design parameters on shear leg effect were also disicussd. According to stress equivalence principle, the effective flange width values under different working conditions were obtained and compared with those from home and abroad foreign design codes. The result shows that the shear lag effect is gradually improved with the increase of load level. When the shear wall yields, the shear lag effect is the most obvious and effective flange width reaches the minimum. The shear lag effect strengthens with the increase of axial compression ratio, weakens with the increase of shear-span ratio and web height-flange width ratio. The effective flange width value taken from Nehrp guidelines for the seismic rehabilitation of buildings (FEMA 273) is reasonable, but the safety stock is inadequate. The effective flange width value derived from Code for design of concrete structures（GB 50010—2010）is too conservative so that material waste is caused and brittle failure may even happen. Therefore, some practical recommendations were proposed in the application of Code for design of concrete structures（GB 50010—2010）for structural design.Keywords: shear wall with flange; shear leg effect; numerical simulation; influence factor; effective flange width*國家自然科學(xué)基金資助項目（51178380）。作者簡介：史慶軒，博士，教授，博士生導(dǎo)師，Email：qingxuanshi@sina.com。參考文獻(xiàn)［1］張世澤.箱形薄壁梁剪力滯效應(yīng)［M］.北京：人民交通出版社，1998.［2］聶建國，王宇航.鋼-混凝土組合梁混凝土翼板開洞截面有效翼緣寬度分析［J］.建筑結(jié)構(gòu)，2010，40(4)：72-75.［3］KWAN A K H. Shear leg in shear/core walls［J］. Journal of Structure Engineering, 1996, 122(9): 1097-1104.［4］史慶軒，委旭，門進(jìn)杰.鋼筋混凝土核心筒結(jié)構(gòu)受力性能的數(shù)值模擬［J］.工程抗震與加固改造，2010，32(2)：1-7.［5］信瑛佩.考慮剪力滯后的復(fù)雜截面剪力墻配筋研究［D］.哈爾濱：哈爾濱工業(yè)大學(xué)，2011.［6］李青寧，張品樂，李曉蕾.短肢剪力墻剪滯效應(yīng)分析［J］.工業(yè)建筑，2011，41(9)：59-62.［7］張守軍，李青寧，郭澤英，等.T形截面短肢剪力墻剪滯效應(yīng)及其影響［J］.工業(yè)建筑，2007，37(10)：38-41.［8］GB 50010—2010混凝土結(jié)構(gòu)設(shè)計規(guī)范［S］.北京:中國建筑工業(yè)出版社，2011.［9］THOMSEN J H IV, WALLACE J W. Displacement-based design of slender reinforced concrete structural walls—experimental verification［J］. Journal of Structure Engineering, 2004, 130(4): 618-630.［10］FEMA 273 Nehrp guidelines for the seismic rehabilitation of buildings［S］. Washington D. C.: Federal Emergency Management Agency, 1997.
