- 摘 要
-
(1 湖南大學(xué)土木工程學(xué)院， 長沙 410082； 2 中國建筑設(shè)計研究院， 北京 100044)
［摘要］收集整理了國內(nèi)外鋼筋混凝土板受沖切破壞的試驗數(shù)據(jù)。通過回歸分析，推導(dǎo)出了考慮混凝土強度、縱筋配筋率及屈服強度、臨界截面位置、板有效高度和板厚尺寸效應(yīng)等影響因素的鋼筋混凝土板受沖切承載力計算公式，并與我國規(guī)范公式、美國規(guī)范公式、歐洲規(guī)范公式進行了比較，結(jié)果表明總體上由試驗數(shù)據(jù)所得到的回歸公式與歐洲規(guī)范公式接近。從可靠度校準(zhǔn)的角度，分析對比了我國規(guī)范和美國規(guī)范中鋼筋混凝土板的受沖切承載力，并與無腹筋梁、板的受剪承載力進行比較，發(fā)現(xiàn)我國規(guī)范中基礎(chǔ)板受沖切承載力和無腹筋梁、板受剪承載力計算公式的可靠指標(biāo)相對偏低；無腹筋板受沖切承載力的可靠度水平總體上低于其軸心受壓、軸心受拉和受彎承載力的可靠度平均水平。最后，給出了我國規(guī)范公式修訂的建議。
［關(guān)鍵詞］鋼筋混凝土; 受剪承載力; 受沖切承載力; 可靠度
中圖分類號：TU375.2 文獻標(biāo)識碼：A 文章編號：1002-848X(2014)14-0001-08
Reliability analysis of punching shear capacity of reinforced concrete slabs
Yi Weijian1, Yang Kai2
(1 College of Civil Engineering, Hunan University, Changsha 410082, China; 2 China Architecture Design & Research Group, Beijing 100044, China)
Abstract: Punching test data of reinforced concrete (RC) slabs from home and abroad were collected. Based on the regression analysis, punching shear capacity formulas of RC slabs were derived, in which the concrete strength, steel reinforcement ratio and yield strength, location of critical perimeter, slab effective depth and size effect of slab depth were introduced. It is shown that the regression equations are generally close to Europe code equations by comparing with the punching shear capacity equations in Chinese, American and Europe code of RC slabs. From the view of reliability index calibration, punching shear capacity of RC slabs between Chinese code and American code were analyzed and compared. By comparing the punching shear capacity with shear capacity of beams and slabs without stirrups, it is indicated that the reliability index of the punching shear capacity formula of footing slabs and the shear capacity formula of beams and slabs without stirrups are comparatively low for Chinese code. The reliability level of punching shear capacity of slabs without stirrups is lower than the average reliability level of compression, tension and bending carrying capacity. Finally, some suggestions for the revision of punching shear capacity formula in Chinese code were proposed.
Keywords: reinforced concrete; shear capacity; punching shear capacity; reliability
*國家自然科學(xué)基金項目資助（51178175，51338004）。
作者簡介：易偉建，博士，教授，Email：wjyi@hnu.edu.cn。
參考文獻
［1］余志武. 鋼筋混凝土板柱連接型沖切構(gòu)件的可靠度分析［J］. 工業(yè)建筑，1987, 17(1):14-20.
［2］鄭建嵐，鄭作樵. 基于可靠度分析的輕骨料砼板沖切承載力研究［J］.福州大學(xué)學(xué)報:自然科學(xué)版，1993, 21(1):63-69.
［3］劉立渠.國內(nèi)外規(guī)范關(guān)于鋼筋混凝土板沖切承載力的比較研究［J］. 建筑結(jié)構(gòu)，2007, 37(7):46-50.
［4］RICHART F E. Reinforced concrete wall and column footings［J］. ACI Structural Journal, 1948，45(2): 97-128.
［5］ELSTNER R C, HOGNESTAD O E. Shearing strength of reinforced concrete slabs［J］. ACI Structural Journal, 1956, 53(7): 29-58.
［6］MOE J. Shearing strength of reinforced concrete slabs and footings under concentrated loads［R］// Development Department Bulletin D47. Skokie: Portland Cement Association, 1961.
［7］REGAN P E. Design for punching shear［J］. The Structural Engineer, 1974，52(6):197-207.
［8］鋼筋混凝土構(gòu)件試驗數(shù)據(jù)集：85年設(shè)計規(guī)范背景資料續(xù)編［M］. 北京：中國建筑科學(xué)研究院，1985.
［9］ACI 318-08 Building code requirements for reinforced concrete［S］. Detroit: American Concrete Institute，2008.
［10］EN 1992-1-1∶2004 Design of concrete structures：general rules and rules for buildings［S］. European Committee for Standardization，2004.
［11］TIAN Y, JAMES O J, BAYRAK O. Strength evaluation of interior slab-column connections［J］. ACI Structural Journal, 2008，105(6): 692-700.
［12］REGAN P E. A comparison British and ACI 318-71 treatments of punching shear［G］//ACI SP-42: Shear in Reinforced Concrete. Detroit, 1974：881-904.
［13］GBJ 68—84建筑結(jié)構(gòu)設(shè)計統(tǒng)一標(biāo)準(zhǔn)［S］. 北京: 中國建筑工程出版社, 1984.
［14］NOWAK A S, SZERSZEN M M. Calibration of design code for buildings (ACI 318): part 1—statistical models for resistance ［J］. ACI Structural Journal, 2003, 100(3): 377-382.
［15］SZERSZEN M M, NOWAK A S. Calibration of design code for buildings (ACI 318): part 2—reliability analysis and resistance factors［J］. ACI Structural Journal, 2003, 100(3): 383-391.
［16］ASCE Standard 7-05 Minimum design loads for buildings and other structures［S］. American Society of Civil Engineers, 2006.
［17］GB 50068—2001建筑結(jié)構(gòu)可靠度設(shè)計統(tǒng)一標(biāo)準(zhǔn)［S］. 北京:中國建筑工業(yè)出版社，2001.
［18］貢金鑫，魏巍巍. 工程結(jié)構(gòu)可靠性設(shè)計原理［M］. 北京: 機械工業(yè)出版社, 2007.
