内置CFRP加强空间夹心节点抗震性能试验研究与分析
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摘要
梁柱采用不同强度混凝土的节点核心区通常采用同柱等强的高强度混凝土浇筑(传统节点),而采用同梁等强的低强度混凝土浇筑(夹心节点)可简化施工过程,但同时降低了节点的抗震性能。为研究碳纤维复合材料(CFRP)加强夹心节点的可行性,通过两组采取加强措施的空间夹心节点试件进行双向等幅低周往复试验研究,对比分析了破坏模式、延性、耗能、变形和承载力等方面的差异。结果表明:CFRP用量不同,对节点核心区的破坏程度有不同影响;CFRP用量越大,加强节点的承载力不一定越高;CFRP用量越小,加强节点的延性与耗能能力越好;在核心区增设碳纤维布需要控制CFRP用量在合适的范围内,才能更好改善夹心节点的抗震性能。
The joint is always casted core area with higher strength concrete of column, which is complex and hard to ensure the quality, while the sandwich beam-column joints casted core area with weaker strength concrete of beam can simplify the construction process, but it reduced the seismic performance of the joint. To study the feasibility of the sandwich joint strengthened with CFRP, two groups of strengthening measures 3 D sandwich joint are tested under bi-directional reversed cyclic loads with constant amplitude to investigate the seismic performance, including the failure mode, ductility, energy dissipation, deformation and carrying capacity. The test results show that the different CFRP dosage has different effects on the shear damage degree to the joint core. The greater CFRP dosage does not always go to the higher bearing capacity. The smaller the CFRP dosage, the better the ductility and energy dissipation ability of the joint is received. For the sandwich joint strengthened with CFRP sheet, the CFRP dosage needs to be controlled in appropriate range, it can better improve the seismic performance of sandwich joint.
The joint is always casted core area with higher strength concrete of column, which is complex and hard to ensure the quality, while the sandwich beam-column joints casted core area with weaker strength concrete of beam can simplify the construction process, but it reduced the seismic performance of the joint. To study the feasibility of the sandwich joint strengthened with CFRP, two groups of strengthening measures 3 D sandwich joint are tested under bi-directional reversed cyclic loads with constant amplitude to investigate the seismic performance, including the failure mode, ductility, energy dissipation, deformation and carrying capacity. The test results show that the different CFRP dosage has different effects on the shear damage degree to the joint core. The greater CFRP dosage does not always go to the higher bearing capacity. The smaller the CFRP dosage, the better the ductility and energy dissipation ability of the joint is received. For the sandwich joint strengthened with CFRP sheet, the CFRP dosage needs to be controlled in appropriate range, it can better improve the seismic performance of sandwich joint.
引文
[1] JGJ 3-2010,高层建筑混凝土结构技术规程[S]JGJ 3-2010,Specification for Concrete Structure of Tall Building[S](in Chinese)
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[3] Kayani M K. Load Transfer From High Strength Concrete Columns Through Lower Strength Concrete Slabs[D]. Urbana: University of Illinois at Urbana-Champaign, 1992
[4] Lee J H, Yoon Y S. Prediction of Effective Compressive Strength of Corner Columns Composing Weaker Slab-Column Joint[J]. Magazine of Concrete Research, 2012, 64(12): 1113~1121.
[5] Shin H O, Yoon Y S, Mitchell D. Axial Load Transfer in Non-slender Ultra-high-strength Concrete Columns Through Normal-strength Concrete Floor Slabs[J].Engineering Structures, 2017, 136: 466~480
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[10] 曹晖, 陈祥, 华建民. 偏心夹心梁柱节点低周反复加载受力性能试验研究[J]. 工程力学, 2012, 29(10): 257~262Cao Hui, Chen Xiang, Hua Jian-min. Experimental Study on Behavior of Eccentric Beam-column Sandwich Joints Under Cyclic Loading[J]. Engineering Mechanics, 2012, 29(10): 257~262(in Chinese)
[11] 闫维明, 侯立群, 张瑞云, 等. 钢筋混凝土框架夹心节点受力性能与施工处理方法研究进展[J]. 工程抗震与加固改造, 2015, (6): 102~109Yan Wei-ming, Hou Li-qun, Zhang Rui-yun, et al. Research on Mechanical Performance and Construction Method of Sandwich Joints of Reinforced Concrete Frame[J]. Earthquake Resistant Engineering and Retrofitting, 2015, (6): 102~109(in Chinese)
[12] 闫维明, 侯立群, 陈适才,等. 双向荷载作用下空间夹心节点受力性能试验研究[J]. 工程力学, 2016, 33(5): 211~219Yan Wei-ming, Hou Li-qun, Chen Shi-cai, et al.Experimental Study on the Mechanical Behavior of 3DS and Wich Joints Under Bi-Directional Loading[J]. Engineering Mechanics, 2016, 33(5): 211~219(in Chinese)
[14] 赵彤, 刘明国, 谢剑. 碳纤维布用于改善斜向受力高强混凝土柱抗震性能的研究[J]. 土木工程学报, 2002, 35(3): 13~19Zhao Tong, Liu Guo-ming, Xie Jian. Study on the Seismic Behavior of High-Strength Concrete Column with CFS Subjected to Axial Compression and Biaxial Bending[J]. China Civil Engineering Journal, 2002, 35(3): 13~19(in Chinese)
[2] Bianchini C A, Woods E R, Kesler E C. Effect of Floor Concrete Strength on Column Strength[J]. Journal of the American Concrete Institute, 1960, 31(11): 1149~1169.
[3] Kayani M K. Load Transfer From High Strength Concrete Columns Through Lower Strength Concrete Slabs[D]. Urbana: University of Illinois at Urbana-Champaign, 1992
[4] Lee J H, Yoon Y S. Prediction of Effective Compressive Strength of Corner Columns Composing Weaker Slab-Column Joint[J]. Magazine of Concrete Research, 2012, 64(12): 1113~1121.
[5] Shin H O, Yoon Y S, Mitchell D. Axial Load Transfer in Non-slender Ultra-high-strength Concrete Columns Through Normal-strength Concrete Floor Slabs[J].Engineering Structures, 2017, 136: 466~480
[6] Zhao Ming, Su Xiaozu, Lu Daoyuan, et al. Seismic Properties of RC Frame Sandwich Type Joint[C]. Canada: 13th World Conference on Earthquake Engineering, 2004, Paper No. 335
[7] 余琼, 李思明. 余琼,等. 核心区和柱混凝土强度不等时节点的性能研究[J]. 同济大学学报(自然科学版), 2004, 32(12): 1583~1588(in Chinese)Yu Qiong, Li Si-ming. Research on Frame′s Joint That Concrete Strength of Core is Inferior to That of Column[J]. Journal of Tongji University (Natural science), 2004, 32(12): 1583~1588(in Chinese)
[8] 陆浩亮, 李思明, 金国芳. 梁柱不同混凝土强度的高层框架节点试验和有限元分析[J]. 力学季刊, 2004, 25(1): 129~134(in Chinese)Lu Hao-liang, Li Si-ming, Jin Guo-fang. Tests and Finite Element Analysis of Frame Joints (Beams and Columns with Different Grade Concrete) In Tall Building[J]. Chinese Quarterly of Mechanics, 2004, 25(1): 129~134(in Chinese)
[9] 李英民, 刘建伟. 钢筋混凝土框架夹心节点抗震性能试验研究[J]. 建筑结构学报, 2010, 31(12): 74~82Li Ying-min, Liu Jian-wei. Pseudo-static Test for Reinforced Concrete Sandwich Beam-column Joints[J]. Journal of Building Structures, 2010, 31(12): 74~82(in Chinese)
[10] 曹晖, 陈祥, 华建民. 偏心夹心梁柱节点低周反复加载受力性能试验研究[J]. 工程力学, 2012, 29(10): 257~262Cao Hui, Chen Xiang, Hua Jian-min. Experimental Study on Behavior of Eccentric Beam-column Sandwich Joints Under Cyclic Loading[J]. Engineering Mechanics, 2012, 29(10): 257~262(in Chinese)
[11] 闫维明, 侯立群, 张瑞云, 等. 钢筋混凝土框架夹心节点受力性能与施工处理方法研究进展[J]. 工程抗震与加固改造, 2015, (6): 102~109Yan Wei-ming, Hou Li-qun, Zhang Rui-yun, et al. Research on Mechanical Performance and Construction Method of Sandwich Joints of Reinforced Concrete Frame[J]. Earthquake Resistant Engineering and Retrofitting, 2015, (6): 102~109(in Chinese)
[12] 闫维明, 侯立群, 陈适才,等. 双向荷载作用下空间夹心节点受力性能试验研究[J]. 工程力学, 2016, 33(5): 211~219Yan Wei-ming, Hou Li-qun, Chen Shi-cai, et al.Experimental Study on the Mechanical Behavior of 3DS and Wich Joints Under Bi-Directional Loading[J]. Engineering Mechanics, 2016, 33(5): 211~219(in Chinese)
[14] 赵彤, 刘明国, 谢剑. 碳纤维布用于改善斜向受力高强混凝土柱抗震性能的研究[J]. 土木工程学报, 2002, 35(3): 13~19Zhao Tong, Liu Guo-ming, Xie Jian. Study on the Seismic Behavior of High-Strength Concrete Column with CFS Subjected to Axial Compression and Biaxial Bending[J]. China Civil Engineering Journal, 2002, 35(3): 13~19(in Chinese)