GFRP管型钢再生混凝土组合柱轴压性能及承载力计算
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摘要
通过对11根玻璃纤维(GFRP)管型钢再生混凝土组合柱的静力加载试验以研究其轴压性能,主要考虑再生粗骨料取代率、配钢率和长细比、再生混凝土强度等级等设计参数,重点分析试件破坏过程及形态、荷载-位移曲线、荷载-应变曲线和承载力等。结果表明:各试件试验过程及破坏形态相似,型钢先发生屈服,随后内部再生混凝土被压碎,最后外部GFRP管纤维撕裂破坏;试件轴压承载力随着取代率和长细比的增大而逐渐减小,其最大降幅分别为10.8%和9.5%;提高配钢率和再生混凝土强度对组合柱的轴压承载力是有利的,其最大增幅分别为14.1%和6.1%。在GFRP管的约束作用下,内部型钢再生混凝土处于三向受压状态,组合柱的承载力得到了显著提高。在此基础上,采用叠加原理并考虑再生粗骨料取代率及长细比的不利影响,提出GFRP管型钢再生混凝土组合柱的轴压承载力计算公式,计算值与试验吻合较好。
Through the static loading test of 11 GFRP tube filled with steel reinforced recycled concrete composite columns to study their axial compression properties. Design parameters include recycled coarse aggregate replacement percentage, steel ratio, slenderness ratio and strength of recycled concrete. Failure process and mode of all specimens, the load-displacement curves and load-strain curves were mainly analyzed. The test results indicate that the axial compressive force process and failure mode of all specimens are similar, the profile steel yield firstly, then the internal recycled concrete crushing, and finally the external GFRP tube occurs buckling deformation. The axial bearing capacity of specimens decreased with the increase of the recycled coarse aggregate replacement percentage and slenderness ratio, the maximum decrease was 7.6% and 11.7%.Increasing the strength of recycled concrete and steel ratio is beneficial to the axial bearing capacity of columns, the maximum increase is 7.9% and 19.7%. Internal steel-reinforced recycled concrete is subjected to three-way pressure under constraints of GFRP tube, axial bearing capacity of composite columns has been significantly improved. On this basis, the calculation formula of axial bearing capacity for the composite columns is put forward, which adopted the principle of overlay and considered the adversely affect of recycled coarse aggregate replacement percentage and slenderness ratio. The calculated value is in good agreement with the actual bearing capacity of the test.
Through the static loading test of 11 GFRP tube filled with steel reinforced recycled concrete composite columns to study their axial compression properties. Design parameters include recycled coarse aggregate replacement percentage, steel ratio, slenderness ratio and strength of recycled concrete. Failure process and mode of all specimens, the load-displacement curves and load-strain curves were mainly analyzed. The test results indicate that the axial compressive force process and failure mode of all specimens are similar, the profile steel yield firstly, then the internal recycled concrete crushing, and finally the external GFRP tube occurs buckling deformation. The axial bearing capacity of specimens decreased with the increase of the recycled coarse aggregate replacement percentage and slenderness ratio, the maximum decrease was 7.6% and 11.7%.Increasing the strength of recycled concrete and steel ratio is beneficial to the axial bearing capacity of columns, the maximum increase is 7.9% and 19.7%. Internal steel-reinforced recycled concrete is subjected to three-way pressure under constraints of GFRP tube, axial bearing capacity of composite columns has been significantly improved. On this basis, the calculation formula of axial bearing capacity for the composite columns is put forward, which adopted the principle of overlay and considered the adversely affect of recycled coarse aggregate replacement percentage and slenderness ratio. The calculated value is in good agreement with the actual bearing capacity of the test.
引文
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[8] 王广勇,张超,李玉梅,等.受火后型钢混凝土框架结构抗震性能[J].建筑结构学报,2017,38(12):78-87 (WANG Guangyong,ZHANG Chao,LI Yumei,et al.Post-fire seismic performance of steel reinforced concrete frame structures[J].Journal of Building Structures,2017,38(12):78-87 (in Chinese))
[9] 翁晓红,邵永健,劳裕华,等.复合受扭型钢混凝土柱抗震性能试验研究[J].建筑结构学报,2017,38(11):23-33 (WENG Xiaohong,SHAO Yongjian,LAO Yuhua,et al.Post-fire seismic performance of steel reinforced concrete frame structures[J].Journal of Building Structures,2017,38(11):23-33 (in Chinese))
[10] 吴刚.加固钢筋混凝土结构的试验研究与理论分析东南大学[D].东南大学,2002 (WU Gang.Experimental study and theoretical analysis on strengthening concrete structures with FRP[D].Southeast University,2002 (in Chinese))
[11] 吴刚,吕志涛.FRP约束混凝土圆柱无软化段时的应力-应变关系研究[J].建筑结构学报,2003,24(5):1-9 (WU Gang,LV Zhitao.Study on the stress-strain relationship of FRP-confined concrete circular column without a strain-softening response[J].Journal of Building Structures,2003,24(5):1-9 (in Chinese))
[12] 刘文竞.钢骨-钢管混凝土柱分析方法研究[D].长沙:湖南大学,2005 (LIU Wenjing.Research on steel tube filled with steel-reinforced concrete column[D].Changsha:Hunan University,2005 (in Chinese))
[13] 吴东辉,杨松,唐桂云,等.FRP 管增强混凝土结构的轴压极限强度[J].纤维复合材料,2006(1):16-17 (WU Donghui,YANG Song,TANG Guiyun,et al.Axial ultimate compressive strength of FRP-tube reinforced concrete structure[J].Fiber Composites,2006(1):16-17 (in Chinese))
[2] 王辉,李宏进,孙清,等.轴压GFRP管件极限承载力试验与理论研究[J].建筑材料学报,2016,19(6):1033-1037 (WANG Hui,LI Hongjin,SUN Qing,et al.Experimental and theoretical study on ultimate bearing capacity of GFRP tubes under axial compression[J].Journal of Building Materials,2016,19(6):1033-1037 (in Chinese))
[3] 彭晖,高勇,谢超,等.FRP-混凝土界面粘结行为的参数影响研究[J].实验力学,2014,29(4):489-498 (PENG Hui,GAO Yong,XIE Chao,et al.Study on the effect of parameters on bond behavior of FRP-concrete interface[J].Journal of Experimental Mechanics,2014,29(4):489-498 (in Chinese))
[4] Mcginnis M J,Davis M,Rosa A D L,et al.Strength and stiffness of concrete with recycled concrete aggregates[J].Construction and Building Materials,2017,154(11):258-269.
[5] 肖建庄,黄一杰.GFRP 管约束再生混凝土柱抗震性能与损伤评价[J].土木工程学报,2012,45(11):112-119 (XIAO Jianzhuang,HUANG Yijie.On the seismic behavior and damage assessment of recycled aggregate concrete filled GFRP tube column[J].China Civil Engineering Journal,2012,45(11):112-119 (in Chinese))
[6] 肖建庄,杨洁.玻璃纤维增强塑料约束再生混凝土轴压试验[J].同济大学学报:自然科学版,2009,37(12):1586-1591 (XIAO Jianzhuang,Yang Jie.On recycled concrete confined by GFRP tube under axial compression[J].Journal of Tongji University:Natural Science Edition,2009,37(12):1586-1591 (in Chinese))
[7] 马辉,薛建阳,刘云贺.反复荷载下型钢再生混凝土组合柱粘结性能研究[J].实验力学,2016,31(5):625-634 (MA Hui,XUE Jianyang,LIU Yunhe.Study on bonding performance of steel reinforced recycled concrete composite column under low-cyclic reversed loading[J].Journal of Experimental Mechanics,2016,31(5):625-634 (in Chinese))
[8] 王广勇,张超,李玉梅,等.受火后型钢混凝土框架结构抗震性能[J].建筑结构学报,2017,38(12):78-87 (WANG Guangyong,ZHANG Chao,LI Yumei,et al.Post-fire seismic performance of steel reinforced concrete frame structures[J].Journal of Building Structures,2017,38(12):78-87 (in Chinese))
[9] 翁晓红,邵永健,劳裕华,等.复合受扭型钢混凝土柱抗震性能试验研究[J].建筑结构学报,2017,38(11):23-33 (WENG Xiaohong,SHAO Yongjian,LAO Yuhua,et al.Post-fire seismic performance of steel reinforced concrete frame structures[J].Journal of Building Structures,2017,38(11):23-33 (in Chinese))
[10] 吴刚.加固钢筋混凝土结构的试验研究与理论分析东南大学[D].东南大学,2002 (WU Gang.Experimental study and theoretical analysis on strengthening concrete structures with FRP[D].Southeast University,2002 (in Chinese))
[11] 吴刚,吕志涛.FRP约束混凝土圆柱无软化段时的应力-应变关系研究[J].建筑结构学报,2003,24(5):1-9 (WU Gang,LV Zhitao.Study on the stress-strain relationship of FRP-confined concrete circular column without a strain-softening response[J].Journal of Building Structures,2003,24(5):1-9 (in Chinese))
[12] 刘文竞.钢骨-钢管混凝土柱分析方法研究[D].长沙:湖南大学,2005 (LIU Wenjing.Research on steel tube filled with steel-reinforced concrete column[D].Changsha:Hunan University,2005 (in Chinese))
[13] 吴东辉,杨松,唐桂云,等.FRP 管增强混凝土结构的轴压极限强度[J].纤维复合材料,2006(1):16-17 (WU Donghui,YANG Song,TANG Guiyun,et al.Axial ultimate compressive strength of FRP-tube reinforced concrete structure[J].Fiber Composites,2006(1):16-17 (in Chinese))
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