- 摘 要
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(湖北工業(yè)大學土木建筑與環(huán)境學院,武漢 430068)
摘要: 針對纖維增強復合材料(FRP)筋混凝土構(gòu)件設計規(guī)范關于裂縫寬度計算公式的有關規(guī)定,研究裂縫寬度計算公式的保證率與荷載組合的關系.提出了以等效保證率作為衡量頻遇組合或準永久組合下裂縫寬度計算公式的安全度評判指標的建議.并據(jù)此研究了«纖維增強復合材料建設工程應用技術規(guī)范» (GB 50608—2010) (簡稱 GB 50608—2010 規(guī)范)裂縫寬度計算公式的安全度設置水平.在此基礎上,對 GB 50608—2010 規(guī)范的裂縫寬度計算公式提出了兩種修訂建議:在原規(guī)范的標準組合下將裂縫寬度公式的計算保證率由 95%降為 85%,相應的受彎構(gòu)件受力特征系數(shù)由 2.1 降為 1.8;考慮采用頻遇組合代替標準組合進行裂縫寬度計算.
關鍵詞: 纖維增強復合材料;等效保證率;裂縫寬度;裂縫控制;安全度設置水平
中圖分類號:TU375.1 文獻標志碼:A 文章編號:1002-848X(2022)18-0115-04
DOI:10.19701 / j.jzjg.20180386
Research on safety setting level of crack control standard for FRP bar concrete component
LI Yang,DAI Xin
(School of Civil Engineering and Architecture,Hubei University of Technology,Wuhan 430068,China)
Abstract: The relationship between the guarantee rate of crack width calculation formula and the load combination wasstudied according to the crack width calculation formula in fiber reinforcement polymer ( FRP) bar concrete componentdesign code. A suggestion was put forward to use equivalent guarantee rate as the safety evaluation index of crack widthcalculation formula under frequency encounter combination or quasi-permanent combination. Based on this,the safetysetting level of the crack width calculation formula of Technical code for infrastructure application of FRP Composites(GB50608—2010)(for short GB 50608—2010 code)was studied. Two revision suggestions were proposed for the calculationformula of crack width of GB 50608—2010 code. Under the standard combination of the original specification,thecalculated guarantee rate of the crack width formula is reduced from 95% to 85%,and the corresponding stresscharacteristic coefficient of bending members is reduced from 2.1 to 1.8. Alternatively,the crack width calculation isperformed in lieu of a standard combination using frequency encounter combination.
Keywords:fiber reinforcement polymer;equivalent guarantee rate;crack width;crack control;safety setting level
∗國家自然科學基金(51508171),湖北省科技廳自然科學基金(2020CFB860).
第一作者:李揚,博士,副教授,主要從事工程結(jié)構(gòu)耐久性能及可靠度研究,Email:409717673@ qq. com.
[引用本文] 李揚,戴欣. FRP 筋混凝土構(gòu)件裂縫控制標準安全度設置水平研究[J]. 建筑結(jié)構(gòu),2022,52(18):115-118,127. LI Yang,DAI Xin. Research on safety setting level of crack control standard for FRP concrete component [J].Building Structure,2022,52(18):115-118,127.
