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（1 合肥工業(yè)大學土木與水利工程學院，合肥 230009；2 安徽土木工程結(jié)構(gòu)與材料省級實驗室，合肥230009；3 清華大學土木工程安全與耐久教育部重點實驗室，北京100084；4 中國建筑科學研究院，北京 100013）

[摘要] 進行了12根HRBF500級高強鋼筋高強混凝土預應(yīng)力梁抗彎試驗，基于名義拉應(yīng)力法研究了最大裂縫寬度的計算方法，并將該方法計算的最大裂縫寬度與中美歐混凝土規(guī)范計算結(jié)果進行了比較。結(jié)果表明：引入裂縫間距可以提高名義拉應(yīng)力法計算裂縫寬度的精度，且計算值總體偏于安全，便于結(jié)構(gòu)設(shè)計人員使用；EN1992-1-1:2004計算精度最高，美國ACI318-08精度較低，我國規(guī)范計算精度處于兩者之間。

[關(guān)鍵詞] 高強鋼筋；高強混凝土；裂縫寬度；名義拉應(yīng)力法

中圖分類號：TU378.2      文獻標識碼：A      文章編號:1002-848X(2013)S1-1451-04

作者簡介：葉獻國，教授，博導，一級注冊結(jié)構(gòu)工程師，Email: yexg428@yahoo.com.cn。

Experiment research on crack width control method using nominal tensile stress for prestressed high-strength RC beams

Ye Xianguo^1,2,Zhang Yimin¹, Chong Xun^1,2,Jiang Qing^1,3,Huang Xiaokun⁴,Liu Gang⁴

(1 School of Civil Engineering, Hefei University of Technology, Hefei 230009, China;2 Anhui Provincial Civil Structural and Material Laboratory, Hefei 230009, China; 3 Key Laboratory of Civil Engineering Safety and Durability of China Ministry of Education，Tsinghua University，Beijing 100084，China; 4 China Academy of Building Research, Beijing 100013, China)

Abstract: Based on the flexural test of 12 prestressed concrete beams with HRBF500 reinforcing bars and high-strength concrete, the nominal tensile stress method for the control of short-term maximum crack width is discussed, and the calculation results of this method is compared with the results calculated using the formulas given in Chinese, American and European concrete codes. The results indicate that the precision of nominal tensile stress method could be proved by inducing the effect of average crack spacing, and the calculation results is inclined to be safe; in the case of the 12 specimens, the European concrete codes EN1992-1-1:2004 has the highest calculation precision, and then is the Chinese concrete code GB 50010—2010, and difference between the test and calculation results of the American code ACI318-08 is the largest .

Keywords: high-strength reinforcing bars; high-strength concrete; crack width; nominal tensile stress method