鋼筋混凝土及預(yù)應(yīng)力混凝土梁抗剪設(shè)計(jì)方法研究
孟少平1，王國(guó)林2，潘鉆峰3
- 摘 要
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孟少平1，王國(guó)林2，潘鉆峰3（1 東南大學(xué)土木工程學(xué)院， 南京 210096； 2 上海應(yīng)用技術(shù)學(xué)院城市建設(shè)與安全工程學(xué)院，上海 201418； 3 同濟(jì)大學(xué)土木工程學(xué)院， 上海 200092）［摘要］ 對(duì)幾個(gè)典型的基于截面的抗剪設(shè)計(jì)方法和基于拉壓桿模型的抗剪設(shè)計(jì)方法進(jìn)行了討論，并建立剪切試驗(yàn)數(shù)據(jù)庫(kù)對(duì)其進(jìn)行了評(píng)估比較。顯式修正壓力場(chǎng)理論（MCFT）方法和加拿大規(guī)范CSA-04規(guī)范公式分別對(duì)鋼筋混凝土（RC）梁（剪跨比λ≥ 2.4）和預(yù)應(yīng)力混凝土（PC）梁（λ≥2.0）的預(yù)測(cè)精度最高，而對(duì)于小剪跨比RC梁（λ≤2.0）和PC梁（λ≤ 2.5），改進(jìn)的拉壓桿模型（MSTM）和我國(guó)《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》（GB 50010—2010）公式的預(yù)測(cè)結(jié)果均偏于安全，但MSTM因合理考慮了預(yù)應(yīng)力貢獻(xiàn)，精度較高。基于數(shù)據(jù)庫(kù)研究表明，軸向預(yù)壓應(yīng)力對(duì)梁抗剪的有利作用存在一個(gè)上限，而試驗(yàn)研究表明曲線預(yù)應(yīng)力筋豎向分力的抗剪作用同時(shí)與剪跨比和縱筋配筋率相關(guān)。［關(guān)鍵詞］鋼筋混凝土; 預(yù)應(yīng)力混凝土; 基于截面的抗剪設(shè)計(jì)方法; 拉壓桿模型; 預(yù)應(yīng)力效應(yīng)中圖分類號(hào)：TU375.1， TU378.1 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2013)19-0025-05Study on shear design methods for reinforced and prestressed concrete beamsMeng Shaoping1, Wang Guolin2, Pan Zuanfeng3(1 School of Civil Engineering, Southeast University, Nanjing 210096, China; 2 College of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China; 3 College of Civil Engineering, Tongji University, Shanghai 200092, China)Abstract: Several sectional design methods and the strut and tie methods for shear had been discussed. Shear database was established respectively to evaluate the design methods. Among the sectional design methods, the explicit Modified Compression Field Theory(MCFT) method gives a good agreement with test results of RC beams with shear span-to-effective depth ratio, λ larger than 2.4, and so does the CSA-04 design formula for PC beams with λ larger than 2.0. For RC beams (λ≤2.0) and PC beams (λ≤2.5), both modified strut and tie model (MSTM) and Chinese code for design of concrete structures(GB 50010—2010) give safe predictions, and MSTM is more accurate due to its reasonable consideration of the prestress effect. Besides, the favorable effect of the axial prestressing on shear strength is verified to have an upper limit through shear database, and the contribution of vertical component of draped tendons is related to both λ and longitudinal reinforcement ratio.Keywords: reinforced concrete; prestressed concrete; sectional design method for shear; strut and tie model; prestress effect作者簡(jiǎn)介：孟少平，博士，教授，博導(dǎo)，Email: cardoso_meng@sina.com。參考文獻(xiàn)［1］ASCE-ACI Committee 445. Recent approaches on shear design of structural concrete［J］. ASCE Journal of Structural Engineering, 1998, 124(12): 1375-417.［2］AASHTO LRFD Bridge specifications SI Units Third Edition［S］. USA: American Association of State Highway and Transportation Officials, 2004.［3］ACI 318R-08. Building code requirements for structural concrete and commentary［S］. Farmington(MI): American Concrete Institute, 2008.［4］CSA Committee A23.3. Design of concrete structures (CSA A23.3-04)［S］. Mississauga: Canadian Standards Association, 2004.［5］GB 50010—2010 混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范［S］. 北京: 中國(guó)建筑工業(yè)出版社, 2010.［6］GB 50010—2002 混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范［S］. 北京: 中國(guó)建筑工業(yè)出版社, 2002.［7］COLLINS M P. Towards a rational theory for RC members in shear［J］. Journal of the Structural Division, ASCE, 1978, 104(4): 649-666.［8］VECCHIO F J, COLLINS M P. The modified compression field theory for reinforced concrete elements subjected to shear［J］. ACI Journal Proceedings, 1986, 83(2): 219-231.［9］BENTZ E C, COLLINS M P. Development of the 2004 CSA A23.3 shear provisions for RC［J］. Canadian Journal of Civil Engineering, 2006, 33(5): 521-534.［10］潘鉆峰. 混凝土結(jié)構(gòu)時(shí)效變形及受剪性能試驗(yàn)與理論研究［D］. 南京: 東南大學(xué), 2011.［11］王國(guó)林. 預(yù)應(yīng)力混凝土梁受剪性能試驗(yàn)研究與理論分析［D］. 南京: 東南大學(xué), 2009.［12］KUPFER H B, GERSTLE K H. Behavior of concrete under biaxial stress［J］. ASCE Journal of Engineering Mechanics Division, 1973, 99(EM4): 853-866.［13］王國(guó)林, 孟少平, 黃仕平. 一種預(yù)測(cè)深受彎構(gòu)件受剪承載力的協(xié)調(diào)方法［J］.建筑結(jié)構(gòu),2009,39(4):97-99.［14］SHAHAWY M A, BATCHELOR B. Shear behavior of full-scale PC girders: Comparison between AASHTO Specification and LRFD Code［J］. PCI Journal, 1996, 41(3): 48-62.
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