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(1 哈爾濱工業(yè)大學(xué)建筑設(shè)計(jì)研究院有限公司, 哈爾濱 150096;2 哈爾濱工業(yè)大學(xué)土木工程學(xué)院, 哈爾濱 150096)
摘要: 冰雪建筑材料具有易于就地取材,材料環(huán)??沙掷m(xù)又兼具美觀效果的獨(dú)特優(yōu)勢(shì),在寒地有著巨大的應(yīng)用潛力,然而其材料強(qiáng)度低、結(jié)構(gòu)建造方式較為傳統(tǒng)極大地限制了冰雪建筑結(jié)構(gòu)的高度、跨度和形態(tài)。 為研究紙漿纖維對(duì)冰梁力學(xué)性能的影響,制作大小為 40mm×40mm×160mm 的純冰冰梁和木質(zhì)紙漿纖維復(fù)合冰冰梁試件,研究復(fù)合冰構(gòu)件在受彎作用下的基本力學(xué)性能、破壞形式和失效機(jī)理,開(kāi)展了 5 組 70 次純冰(包括江冰 13 次)和 16 組 223次復(fù)合冰冰梁試件的電液伺服跨間對(duì)稱(chēng)點(diǎn)彎曲加載試驗(yàn),共計(jì) 293 次。 試驗(yàn)結(jié)果表明:摻入增強(qiáng)纖維能夠有效改善冰材料在受彎作用下的破壞形式,使試件趨于延性破壞;同時(shí),隨著增強(qiáng)纖維配合比的增加,復(fù)合冰冰梁失效過(guò)程中增強(qiáng)纖維對(duì)冰材料的持續(xù)“拉結(jié)”作用不斷增強(qiáng),表現(xiàn)為開(kāi)裂強(qiáng)度突變減??;開(kāi)裂后強(qiáng)度突變次數(shù)增多;冰梁失效發(fā)展過(guò)程更加緩慢。
關(guān)鍵詞: 復(fù)合冰; 紙漿纖維; 彎曲試驗(yàn); 纖維含量; 失效機(jī)理
中圖分類(lèi)號(hào):TU317+.2 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002?848X(2022)12?0041?05
Experimental study on flexural behavior of ice beam reinforced by pulp fiber SUN Jianfeng1, HUANG Junkai
2, WU Yue2
(1 The Architectural Design and Research Institute of HIT Co., Ltd., Harbin 150096, China;2 School of Civil Engineering, Harbin Institute of Technology, Harbin 150096, China)
Abstract: Ice and snow building materials have the unique advantages of being easy to obtain, environmentally friendly, sustainable and aesthetically pleasing, and have great application potential in cold regions. However, its low material strength and traditional structural construction method greatly limit the height, span and shape of ice and snow building structures. In order to study the effect of pulp fibers on the mechanical properties of ice beams, the pure ice beams and the wood pulp fiber composite ice beams were made with a size of 40mm×40mm×160mm, and the basic mechanical properties and failure modes of composite ice members under bending were studied. Electro?hydraulic servo bending loading tests were carried out on symmetric points between spans for a total of 293 times including 5 groups of 70 times of pure ice beam specimens (including 13 times of river ice beam specimens) and 16 groups of 223 times of composite ice beam specimens.The experimental results show that the addition of reinforcing fibers can effectively improve the failure mode of the icematerial under bending to make the specimen tend to ductile failure; at the same time, with the increase of the mixing ratio of the reinforcing fibers, the continuous " binding" effect of the reinforcing fibers on the ice material during the failure process of the composite ice beam is continuously enhanced, which is manifested as a sudden decrease in the cracking strength; after cracking, the number of strength mutations increases; the failure development process of ice beam is slower.
Keywords:composite ice; pulp fiber; flexural test; fiber content; failure mechanism
∗國(guó)家自然科學(xué)基金面上項(xiàng)目(51778182)。
第一作者:孫健峰,碩士,助理工程師,主要從事建筑結(jié)構(gòu)技術(shù)在非傳統(tǒng)領(lǐng)域的創(chuàng)新應(yīng)用研究,Email: sjf2886686@ 163.com。
[引用本文] 孫健峰,黃俊凱,武岳. 紙漿纖維增強(qiáng)冰梁受彎性能試驗(yàn)研究[J]. 建筑結(jié)構(gòu),2022,52(12):41?45,24.SUN Jianfeng,HUANG Junkai,WU Yue. Experimental study on flexural behavior of ice beam reinforced by pulp fiber[J].Building Structure,2022,52(12):41?45,24.
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