Eccentric Compressive Behavior of Reinforced Concrete Columns Strengthened Using Steel Mesh Reinforced Resin Concrete
Eccentric Compressive Behavior of Reinforced Concrete Columns Strengthened Using Steel Mesh Reinforced Resin Concrete
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钢网增强树脂混凝土加固钢筋混凝土柱的偏心受压性能
DOI：
10.3390/app8101827
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发表时间：
2018-10
期刊：
影响因子：
--
通讯作者：
Ga
中科院分区：
文献类型：
--
作者：
Xiaobin Li;Hongwei Xie;Meng Yan;Hongye Gou;Ga
快速强化技术是近年来研究的热点，其目的是缩短强化时间，减少损失。然而，现有的加固技术用于快速加固存在一定的局限性。本文对钢筋混凝土柱采用钢丝网增强树脂混凝土快速加固的偏心受压性能进行了试验研究。制作了4根截面尺寸为180 mm × 250 mm、试验高度为1000 mm的钢筋混凝土柱，进行了大偏心受压试验。其中3根采用不同层数的SMRC加固，另1根未加固，作为对照试件。研究了钢筋网层数对柱的破坏形态、开裂荷载和承载力的影响。通过有限元分析，研究了钢筋网层数、SMRC层厚度和承载力水平对柱承载力的影响。结果表明，钢筋网层数对加固柱裂缝分布有影响。层数是承载能力的主导变量，而不是SMRC层的厚度。随着承载力保持水平的提高，加固柱的承载力呈双线性下降趋势。得出钢筋网的合理配筋率为2%左右。树脂混凝土主要用作粘结层。在高承载力水平下，承载力的下降速率更大。
Rapid strengthening is focused on recently to reduce the time for reinforcement process and decrease the losses. However, there are some limits for the existing reinforcement technologies to be used for rapid strengthening. The paper reports an experimental investigation on eccentric compressive behavior of reinforced concrete columns that are strengthened using steel mesh reinforced resin concrete (SMRC) for rapid strengthening. Four reinforced concrete columns with 180 mm × 250 mm test cross section and 1000 mm test height were fabricated and tested under large eccentric compressive load. Among the four columns, three columns were strengthened using SMRC with different numbers of steel mesh layers; the other column was not strengthened and was used as the control specimen. The effect of layer number of steel mesh on the failure mode, cracking load and load capacity of the columns were studied. Finite element analysis was carried out to evaluate the effects of the layer number of steel mesh, thickness of SMRC layer, and the load-holding level on the load capacity of the columns. Results show that the crack distribution of the strengthened columns was influenced by the layer number of steel mesh. The layer number was the dominant variable for the load capacity, rather than the thickness of the SMRC layer. With the increase of load-holding level, the load capacity of the strengthened column decreased following a bilinear trend. Some conclusions can be drawn that the reasonable reinforcement ratio of steel mesh is about 2%. Resin concrete is mainly used as bonding layer. The decreasing rate of the bearing capacity is higher at the high load-holding levels.
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DOI：
10.1177/0731684417725396
发表时间：
2017-08
期刊：
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影响因子：
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影响因子：
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