- 摘 要
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（1 鄭州大學(xué)土木工程學(xué)院，鄭州 450001； 2 鄭州市市政工程管理處， 鄭州 450002；3 開封大學(xué)土木建筑工程學(xué)院，開封 475004）
［摘要］針對配有細(xì)晶粒高強鋼筋HRBF500的混凝土梁進行受彎疲勞性能的理論研究?；谄谠囼灲Y(jié)果，分析得到，影響HRBF500鋼筋混凝土試驗梁受彎疲勞性能及疲勞壽命的主要因素為疲勞荷載作用下縱向受拉鋼筋初始最大拉應(yīng)力和配筋率。分析研究試驗梁疲勞試驗的數(shù)據(jù)，提出了在滿足疲勞荷載使縱向受拉鋼筋初始最大拉應(yīng)力不大于155MPa的情況下，考慮配筋率和疲勞次數(shù)影響的縱向受拉鋼筋最大拉應(yīng)力σmax計算公式，該公式的計算結(jié)果與試驗結(jié)果吻合良好，可用于HRBF500鋼筋混凝土梁疲勞壽命預(yù)測。同時擬合出了疲勞荷載作用下試驗梁跨中撓度較靜力荷載作用下的增長量計算公式，該公式的計算結(jié)果亦與試驗結(jié)果吻合良好，由此推導(dǎo)出疲勞荷載作用下HRBF500鋼筋混凝土梁跨中撓度計算公式。研究成果可用于HRBF500鋼筋混凝土受彎構(gòu)件的設(shè)計及疲勞壽命預(yù)測。
［關(guān)鍵詞］HRBF500鋼筋; 鋼筋混凝土梁; 疲勞性能; 疲勞壽命預(yù)測; 理論研究
中圖分類號：TU375 文獻標(biāo)識碼：A 文章編號：1002-848X(2014)16-0072-05
Theoretical study on flexural fatigue performance of RC beams with the HRBF500 rebar
Wang Xinling1, Huang Weidong2, Chen Qingping3
( 1 School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China; 2 Zhengzhou City Municipal Engineering Administration, Zhengzhou 450002, China; 3 School of Civil Engineering, Kaifeng University, Kaifeng 475004, China)
Abstract: The theoretical study on flexural fatigue performance of RC beams with fine-grain high-strength HRBF500 rebar was done. Based on the result of the fatigue experiment, the main factors affecting flexural fatigue performance and fatigue life of RC beams with HRBF500 rebar are initial maximum tension stress and reinforcement ratio of the longitudinal tensile steel under fatigue load. Through analysis of the fatigue experimental data, the formulas of maximum tension stressσmax of the longitudinal tensile steel was proposed considering the effects of reinforcement ratio and fatigue numbers when initial maximum tension stress of the longitudinal tensile steel is not bigger than 155MPa. The calculation results are in good agreement with the experimental results, and the formulas of maximum tension stressσmax can be used to predict the fatigue life of RC beams with HRBF500 rebar. The increment calculation formula of mid-span deflection of RC beams with HRBF500 rebar under the static load which is equal to the fatigue load was proposed. The calculation results are in good agreement with the experimental results and the formula of mid-span deflection of RC beams with HRBF500 rebar under fatigue load was deduced. The study results can be used to design and predict the fatigue life of RC flexural components with HRBF500 rebar.
Keywords: HRBF500 rebar; RC beam; fatigue performance; fatigue life prediction; theoretical study
*國家高新技術(shù)研究發(fā)展(863)計劃項目子課題（2008AA030704）。
作者簡介：王新玲，博士,教授，Email：wxlwzn@126.com。
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