| 喷射超高韧性水泥基复合材料加固带裂缝素混凝土梁的力学性能试验研究 |
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| 引用本文： | 李伟平,穆富江,王激扬,丁海洋,徐世烺.喷射超高韧性水泥基复合材料加固带裂缝素混凝土梁的力学性能试验研究[J].世界地震工程,2018,34(1):166-172. |
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| 作者姓名： | 李伟平 穆富江 王激扬 丁海洋 徐世烺 |
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| 作者单位： | 1. 浙江省交通规划设计研究院, 浙江 杭州 310006;2. 浙江大学, 浙江 杭州 310058 |
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| 摘 要： | 对既有受损混凝土结构的加固维修是地震灾后重建的重点之一。应用喷射超高韧性水泥基复合材料（UHTCC）的拉伸应变硬化特性，研究了带裂缝混凝土梁底部喷射20mm薄层UHTCC的加固作用。结果表明:薄层喷射UHTCC对混凝土梁的弯曲强度和弯曲刚度有明显的加固作用，可将带预制裂缝的混凝土梁极限承载力提高117.5%，使受损混凝土梁的承载能力恢复到相同尺寸无损混凝土梁承载能力相当的水平；此外混凝土梁底部薄层喷射UHTCC能将裂缝宽度控制在0.1mm以下的微裂缝，有利于提高混凝土梁的耐久性。
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| 关 键 词： | 喷射UHTCC 修复加固 裂缝控制 力学性能 |
Experimental study on mechanical performance of cracked plain concrete beams retrofitted by sprayed ultra high toughness cementitious composites |
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| LI Weiping,MU Fujiang,WANG Jiyang,DING Haiyang,XU Shilang.Experimental study on mechanical performance of cracked plain concrete beams retrofitted by sprayed ultra high toughness cementitious composites[J].World Information On Earthquake Engineering,2018,34(1):166-172. |
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| Authors: | LI Weiping MU Fujiang WANG Jiyang DING Haiyang XU Shilang |
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| Affiliation: | 1. Zhejiang Provincial Institute of Communications Planning, Design & Research, Hangzhou 310006, China;2. Zhejiang University, Hangzhou 310058, China |
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| Abstract: | Reinforcing current damaged concrete structure is one of the points of the post-earthquake reconstruction. In this paper, the cracked concrete beams strengthened by 20 mm thin layer UHTCC are studied applying the tensile strain hardening properties of sprayed UHTCC. Test results show a dramatically improvement of 117.5% in the flexural strength when compared with the same concrete beams without being repaired by thin layer of sprayed UHTCC. Besides, cracks’ widths were well controlled below 100um in the layer of UHTCC and the width of crack in concrete is also well limited when the load was at a high level, which is good for the durability of concrete beams. |
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| Keywords: | sprayed UHTCC retrofit crack control mechanical performance |
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