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(廣西科技大學(xué)土木建筑工程學(xué)院， 柳州 545006)

摘要: 預(yù)應(yīng)力碳纖維增強(qiáng)基復(fù)合材料(CFRP)筋型鋼混凝土結(jié)構(gòu)是一種采用預(yù)應(yīng)力 CFRP 筋代替普通預(yù)應(yīng)力筋的新型結(jié)構(gòu)。 基于平截面假定與«組合結(jié)構(gòu)設(shè)計(jì)規(guī)范»(JGJ 138—2016)，推導(dǎo)出了預(yù)應(yīng)力 CFRP 筋型鋼混凝土結(jié)構(gòu)受拉開裂荷載計(jì)算公式；通過 7 個(gè)預(yù)應(yīng)力 CFRP 筋型鋼混凝土試件受拉試驗(yàn)的試驗(yàn)結(jié)果與該開裂荷載計(jì)算公式計(jì)算結(jié)果的對比，驗(yàn)證了該開裂荷載計(jì)算公式的準(zhǔn)確性。 同時(shí)，采用有限元軟件 ABAQUS 對預(yù)應(yīng)力 CFRP 筋型鋼混凝土構(gòu)件進(jìn)行模擬分析，并得出基于加載偏心距與預(yù)應(yīng)力張拉水平兩種參數(shù)下的影響因子擬合面函數(shù)。 結(jié)果表明，試件開裂荷載總體趨勢為隨偏心距的增大而減小，隨預(yù)應(yīng)力張拉水平的增大而增大。 該擬合面函數(shù)與受拉開裂荷載計(jì)算公式或者現(xiàn)場試驗(yàn)配合使用，可為實(shí)際工程設(shè)計(jì)提供一定的便利。

關(guān)鍵詞: 碳纖維增強(qiáng)基復(fù)合材料(CFRP)； 預(yù)應(yīng)力； 型鋼混凝土； 開裂荷載； 擬合面函數(shù)

中圖分類號:TU378 文獻(xiàn)標(biāo)志碼:A 文章編號:1002￣848X(2022)04￣0112￣09

DOI:10. 19701 / j.jzjg.20200572

Calculation of cracking load of steel reinforced concrete members with prestressed CFRPreinforcement under tension and fitting surface function of influencing factors

ZHANG Peng， ZHAO Xiaodong， DENG Yu， SHEN Minhe

(Department of Civil Engineering and Architecture， Guangxi University of Science and Technology，Liuzhou 545006， China)

Abstract:Steel reinforced concrete structure with prestressed carbon fibre￣reinforced polymer ( CFRP) reinforcement is anew type of structure which uses prestressed CFRP reinforcement instead of ordinary prestressed reinforcement. Based onthe assumption of plane section and Code for design of composite structures ( JGJ 138—2016)， the calculation formula ofcracking load of steel reinforced concrete structure with prestressed CFRP reinforcement under tension was derived， and thecalculation formula accuracy of the cracking load was verified by comparing the tensile test results of 7 steel reinforcedconcrete specimens with prestressed CFRP reinforcement with the calculation results of the calculation formula of crackingload. At the same time， the finite element software ABAQUS was used to simulate and analyze the steel reinforced concretemembers with prestressed CFRP reinforcement， and the influence factors fitting surface function was obtained based on thetwo parameters of the loading eccentricity and the prestress tension level. The results show that the overall tendency ofcracking load of the specimen decreases with the increase of the eccentricity， and increases with the increase of theprestress tension level. The fitting surface function is used in conjunction with the tensile cracking load calculation formulaor field test to provide certain convenience for actual engineering design.

Keywords: carbon fibre￣reinforced polymer ( CFRP )； prestressed； steel reinforced concrete； cracking load； fittingsurface function

∗國家自然科學(xué)基金資助項(xiàng)目(51768008)，中國博士后科學(xué)基金項(xiàng)目(2017M613273XB)，柳州市科學(xué)研究與技術(shù)開發(fā)計(jì)劃(2017BC40202)，廣西科技大學(xué)創(chuàng)新團(tuán)隊(duì)支持計(jì)劃(GKYC201908)。

第一作者:張鵬，博士，教授，主要從事結(jié)構(gòu)工程等方面的研究，Email:zhaoxiaodong010@ sina.com。

[引用本文] 張鵬，趙曉冬，鄧宇，等. 預(yù)應(yīng)力 CFRP 筋型鋼混凝土構(gòu)件受拉開裂荷載計(jì)算與影響因子擬合面函數(shù)[ J]. 建筑結(jié)構(gòu)，2022，52(4):112￣120，135. ZHANG Peng，ZHAO Xiaodong，DENG Yu，et al. Calculation of cracking loadof steel reinforced concrete members with prestressed CFRP reinforcement under tension and fitting surface function ofinfluencing factors[J]. Building Structure，2022，52(4):112￣120，135.