- 摘 要
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（1 中國建筑西南設(shè)計(jì)研究院有限公司， 成都 610041；2 西南交通大學(xué)交通隧道工程教育部重點(diǎn)實(shí)驗(yàn)室， 成都 610031）
［摘要］對無筋鋼纖維混凝土進(jìn)行軸壓試驗(yàn)、殘余彎拉強(qiáng)度試驗(yàn)和壓彎梁受力性能試驗(yàn)。力學(xué)性能試驗(yàn)結(jié)果表明，無筋鋼纖維混凝土的抗壓、抗拉強(qiáng)度均高于不摻入鋼纖維的混凝土。對無筋鋼纖維混凝土壓彎梁的裂縫隨荷載變化的發(fā)展規(guī)律進(jìn)行了分析。結(jié)果表明，偏心距是影響其裂縫發(fā)展的一個重要影響因素，偏心距適用范圍為0～0.15m。最后，基于平截面假定和復(fù)合材料理論，提出了無筋鋼纖維混凝土壓彎梁極限狀態(tài)下的裂縫高度計(jì)算公式，并對比試驗(yàn)結(jié)果驗(yàn)證了其公式的準(zhǔn)確性。
［關(guān)鍵詞］無筋鋼纖維混凝土； 壓彎梁試驗(yàn)； 裂縫發(fā)展； 偏心距； 裂縫高度
中圖分類號：TU375.1， TU528-572文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2020)22-0093-06
Research on crack development of unreinforced steel fiber concrete compression-bending beam
LIU Ruoyu1, WANG Zhijie2
(1 China Southwest Architectural Design and Research Institute Co., Ltd., Chengdu 610041, China； 2 Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China)
Abstract:The unreinforced steel fiber concrete has been subjected to axial compression test, residual bending tensile strength test and compression-bending beam performance test. The mechanical performance test results show that its compressive and tensile strength of unreinforced steel fiber concrete are higher than that of concrete without steel fiber. The development law of cracks in unreinforced steel fiber concrete compression-bending beams with load was analyzed. The results show that the eccentricity is an important factor affecting the development of the cracks, and the applicable range of eccentricity is 0～0.15m. Finally, based on the theory of flat cross-section false and composite materials, a formula for calculating the crack height of unreinforced steel fiber concrete compression-bending beams under the limit state was proposed, and the accuracy of the formula was verified by comparing the test results.
Keywords:unreinforced steel fiber concrete; press-bending beam test; crack development; eccentricity; crack height
作者簡介：劉若愚，碩士，助理工程師，Email：312603048@qq.com。
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