纸浆纤维增强冰梁受弯性能试验研究
摘要：冰雪建筑材料具有易于就地取材，材料环保可持续又兼具美观效果的独特优势，在寒地有着巨大的应用潜力，然而其材料强度低、结构建造方式较为传统极大地限制了冰雪建筑结构的高度、跨度和形态。为研究纸浆纤维对冰梁力学性能的影响，制作大小为40mm×40mm×160mm的纯冰冰梁和木质纸浆纤维复合冰冰梁试件，研究复合冰构件在受弯作用下的基本力学性能、破坏形式和失效机理，开展了5组70次纯冰(包括江冰13次)和16组223次复合冰冰梁试件的电液伺服跨间对称点弯曲加载试验，共计293次。试验结果表明：掺入增强纤维能够有效改善冰材料在受弯作用下的破坏形式，使试件趋于延性破坏；同时，随着增强纤维配合比的增加，复合冰冰梁失效过程中增强纤维对冰材料的持续“拉结”作用不断增强，表现为开裂强度突变减小；开裂后强度突变次数增多；冰梁失效发展过程更加缓慢。
关键词：复合冰；纸浆纤维；弯曲试验；纤维含量；失效机理
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[3] 冰雪景观建筑技术标准：GB 51202—2016[S].北京：中国建筑工业出版社，2016.
[4] VASILIEV N K,PRONK A D C,SHATALINA I N,et al.A review on the development of reinforced ice for use as a building material in cold regions[J].Cold Regions Science and Technology,2015,115:56-63.
[5] 武岳，陈博轩，刘秀明，等.冰雪建筑结构的发展与创新[J].建筑结构，2018,48(12):34-39.
[6] PRONK A,VASILIEV N,BELIS J.Historical development of structural ice[C] //Proceedings of the Third International Conference on Structures and Architecture (ICSA2016).Guimarães:CRC Press Taylor & Francis Group,2016:339-347.
[7] BENJAMIN KROMOSER,JOHANN KOLLEGGER.Using ice to build shell structures[C]//10th International Conference and Exhibition on Performance of Ships and Structures in Ice.Banff,2012:1-8.
[8] JANSSEN F H M E,HOUBEN R W G.Reinforced ice structures:a research on the building method fort and application of ice composite[D].Eindhoven:Eindhoven University of Technology,2013.
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Experimental study on flexural behavior of ice beam reinforced by pulp fiber
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 40 mm×40 mm×160 mm, 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 ice material 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
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