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(東華理工大學(xué)土木與建筑工程學(xué)院，  南昌 330012)

［摘要］為提高廢棄混凝土利用率，以及解決鋼筋容易腐蝕的問(wèn)題，同時(shí)能將蒸養(yǎng)的優(yōu)勢(shì)運(yùn)用到工程中來(lái)，研究了不同體積率的鋼纖維對(duì)蒸養(yǎng)GFRP筋鋼纖維再生混凝土梁受彎性能的影響，本試驗(yàn)制作了4根試驗(yàn)梁分析其裂縫形態(tài)、開(kāi)裂荷載、極限荷載、荷載-撓度曲線、平截面假定、受拉鋼筋應(yīng)變。同時(shí)制作了8個(gè)再生混凝土立方體試塊測(cè)其抗壓強(qiáng)度、觀測(cè)其破壞形態(tài)。試驗(yàn)結(jié)果表明：鋼纖維可提高再生混凝土抗壓強(qiáng)度，且以鋼纖維體積率為1.0%時(shí)最優(yōu)，鋼纖維可改善再生混凝土的脆性；鋼纖維體積率越大，試驗(yàn)梁的開(kāi)裂荷載和極限荷載提高越明顯；4種GFRP筋鋼纖維再生混凝土梁的破壞方式均為正截面受彎破壞并符合平截面假定；鋼纖維能提高試驗(yàn)梁的抗裂能力并降低試驗(yàn)梁撓度及受拉鋼筋應(yīng)變。

［關(guān)鍵詞］鋼纖維體積率；再生混凝土；GFRP筋；蒸養(yǎng)；受彎性能

中圖分類(lèi)號(hào)：TU375文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)08-0071-06

Research on bending performance of steam-cured GFRP reinforced steel fiber recycled concrete beam

YANG Wenrui, YUAN Jiao, LI Huiying, FENG Zhongmin, ZHANG Jie

(School of Civil and Architectural Engineering，East China University of Technology， Nanchang 330012， China)

Abstract:In order to improve the utilization rate of waste concrete and solve the problem of easy corrosion of steel bars，at the same time，the advantages of steam-curing can be applied in the project，the influence of steel fibers with different volume fractions on the bending performance of steam-cured GFRP reinforced steel fiber recycled concrete beams was studied. In this experiment, four test beams were set up to analyze the crack shape，cracking load and ultimate load, load-deflection curve，flat section assumption and strain of tensile steel bar. At the same time, 8 recycled concrete cube test blocks were made to measure their compressive strength and observe their failure modes. The test results show that: steel fiber can increase the compressive strength of recycled concrete, and the optimal volume rate of steel fiber is 1.0%. Steel fiber can improve the brittleness of recycled concrete；the larger the volume rate of steel fiber，the more obvious the increase of the cracking load and ultimate load of the test beam；the failure modes of the four GFRP steel fiber recycled concrete beams are all normal section bending failure and conform to the flat section assumption；steel fiber can improve the crack resistance of the test beam and reduce the deflection of the test beams and the strain of the tensile steel bars.

Keywords:volume rate of steel fiber;recycled concrete;glass fiber reinforced plastic;steam-cure;bending performance

*江西省自然科學(xué)基金(20181BAB216027)，江西省教育廳科技計(jì)劃項(xiàng)目(GJJ170486), 博士啟動(dòng)金 (DHBK2017119), 國(guó)家自然科學(xué)基金(51178361)。

作者簡(jiǎn)介：楊文瑞，博士，講師，碩士生導(dǎo)師，Email:wryang99@163.com；

通信作者：袁嬌，碩士研究生，Email:271722996@qq.com。