钢纤维和养护制度对超高性能混凝土材料阻尼性能及机理的影响

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (11) : 245-253.

土木工程

钢纤维和养护制度对超高性能混凝土材料阻尼性能及机理的影响

陈昭晖*1，陶然1,2，汪瑶杰1,3

作者信息 +

Effects of steel fibers and curing regime on damping property and mechanism of ultra-high performance concrete material

CHEN Zhaohui*1, TAO Ran1,2, WANG Yaojie1,3

Author information +

文章历史 +

摘要

考虑钢纤维参数和养护制度等因素，研究了超高性能混凝土（UHPC）的阻尼性能和机理。结果表明：掺入钢纤维提升了UHPC阻尼性能，纤维体积掺量为2.5%时UHPC阻尼比较未掺时增加了54.9%；减小钢纤维长径比、采用标准养护可使UHPC具有更好的阻尼性能。合理选择钢纤维参数和养护制度可制备出兼顾阻尼、强度和经济成本的UHPC材料。考虑钢纤维对UHPC阻尼性能的正负效应，建立了UHPC材料阻尼的半经验预测公式。微观层面上，随钢纤维掺量增加、长径比减小以及采用标准养护制度，UHPC基体中掺入钢纤维形成的纤维-基体界面过渡区、微孔隙和微裂缝等内部缺陷会增多，但有利于UHPC材料通过钢纤维的形变、钢纤维-基体界面间摩擦、微裂缝开合、微孔隙变形以及微孔隙内部空气的柔性缓冲等机制产生阻尼耗能。

Abstract

Damping property and mechanism of ultra-high performance concrete (UHPC) were experimentally investigated considering the effects of steel fiber volume content, aspect ratio of steel fiber and curing regime. The results show that steel fibers can improve the damping property of UHPC, which is increased by 54.9% with the steel fiber volume content of 2.5% comparing with that without steel fibers. UHPC has better damping property with smaller aspect ratio of steel fibers and the employment of standard curing. With the reasonable selection of physical parameters of steel fiber and curing regime, UHPC materials with balanced damping property, mechanical strength and economic cost can be produced. A semi-empirical prediction formula for UHPC damping is established by considering the positive and negative effects of steel fibers. From microscale analysis, the addition of steel fibers into the UHPC matrix can introduce initial imperfections, including the fiber-matrix interface transition zones, micropores and microcracks, which are increased with the increasing volume content of steel fibers, the reducing aspect ratio of steel fibers and the application of standard curing. Therefore, the UHPC damping is generated by the deformation of steel fibers, friction between steel fibers and matrix, the opening and closing of microcracks, the strain around micropores, as well as the flexible cushion of air inside the micropores.

导出引用

陈昭晖1, 陶然1, 2, 汪瑶杰1, 3. 钢纤维和养护制度对超高性能混凝土材料阻尼性能及机理的影响[J]. 振动与冲击, 2025, 44(11): 245-253

CHEN Zhaohui1, TAO Ran1, 2, WANG Yaojie1, 3. Effects of steel fibers and curing regime on damping property and mechanism of ultra-high performance concrete material[J]. Journal of Vibration and Shock, 2025, 44(11): 245-253

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