带环向脱空缺陷的钢管混凝土构件在压弯扭复合受力作用下的滞回性能研究
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摘要
为研究环向脱空缺陷对钢管混凝土试件在压弯扭复合受力作用下抗震性能的影响,进行了12个钢管混凝土试件(包括8个带缺陷试件、2个无脱空试件以及2个空钢管对比试件)在恒定轴压力和反复弯扭耦合荷载作用下的滞回性能试验。试验主要参数为:脱空率、弯扭比和轴压比。基于试验结果考察了带脱空缺陷的钢管混凝土试件在压弯扭复合受力作用下的破坏模态,并分析了脱空对试件滞回曲线、骨架曲线、刚度和耗能等力学指标的影响规律,结果表明:环向脱空缺陷的存在会改变钢管混凝土构件的破坏模态,并使试件的承载力、刚度和耗能能力有不同程度的降低。同时,建立钢管混凝土压弯扭构件的有限元模型,分析环向脱空对构件承载力系数,以及钢管与核心混凝土接触时刻的影响规律,在此基础上提出相关工程建议。
In order to study the effects of circumferential gap on the seismic behaviour of concrete-filled steel tubular(CFST) members subjected to combined compression-bending-torsion load, a total of 12 specimens including 8 CFST specimens with circumferential gap, 2 CFST specimens without gap and 2 hollow steel sections, were tested under constant axial compressive load and cyclically combined actions of bending and torsion. The testing parameters included gap ratio, bending-torsion ratio and axial load level. Based on the test results, the failure mode of the CFST with circumferential gap was investigated, and the influences of gap on the hysteretic curve, skeleton curve, stiffness and energy dissipation capacity were experimentally analyzed. It was evident that the existence of circumferential gap could change the failure mode of a CFST specimen, and decrease its ultimate strength, stiffness and dissipated energy. Meanwhile, a finite element model was also established, and the effects of circumferential gap on the strength index and the contact time between outer steel tube and core concrete were investigated by the numerical model. According to the experimental and numerical studies, some suggestions were proposed for the practical CFST structures.
In order to study the effects of circumferential gap on the seismic behaviour of concrete-filled steel tubular(CFST) members subjected to combined compression-bending-torsion load, a total of 12 specimens including 8 CFST specimens with circumferential gap, 2 CFST specimens without gap and 2 hollow steel sections, were tested under constant axial compressive load and cyclically combined actions of bending and torsion. The testing parameters included gap ratio, bending-torsion ratio and axial load level. Based on the test results, the failure mode of the CFST with circumferential gap was investigated, and the influences of gap on the hysteretic curve, skeleton curve, stiffness and energy dissipation capacity were experimentally analyzed. It was evident that the existence of circumferential gap could change the failure mode of a CFST specimen, and decrease its ultimate strength, stiffness and dissipated energy. Meanwhile, a finite element model was also established, and the effects of circumferential gap on the strength index and the contact time between outer steel tube and core concrete were investigated by the numerical model. According to the experimental and numerical studies, some suggestions were proposed for the practical CFST structures.
引文
[1]韩林海.钢管混凝土结构-理论与实践[M].第三版.北京:科学出版社,2016
[2]Han L H,Li W,Bjorhovde R.Developments and advanced application of concrete-filled steel tubular(CFST)structures:Members[J]. Journal of Constructional Steel Research, 2014, 100:211-228
[3] Han L H, Li W, Ren Q X. Tests on inclined, tapered and STS concrete-filled steel tubular(CFST)stub columns[J]. Journal of Constructional Steel Research, 2010,66(10):1186-1195
[4] Liao F Y, Han L H, He S H. Behavior of CFST short column and beam with initial concrete imperfection:Experiments[J]. Journal of Constructional Steel Research, 2011, 67(12):1922-1935
[5] Liao F Y, Han L H, Tao Z. Behavior of CFST stub columns with initial concrete imperfection:Analysis and calculations[J]. Thin-walled Structures, 2013, 70:57-69
[6] Nie J G, Wang Y H, Fan J S. Experimental research on concrete filled steel tube columns under combined compression-bending-torsion cyclic load[J].Thin-Walled Structures, 2013, 67:1-14
[7] Wang Y H, Zhou X H. Non-linear torsion behaviour of concrete filled steel tube columns[J]. Materials&Structures, 2016, 49(12):5227-5241
[8] Wang Y H, Nie J G, Fan J S. Fiber beam-column element for circular concrete filled steel tube under axial-flexure-torsion combined load[J]. Journal of Constructional Steel Research, 2014, 95:10-21
[9]王宇航.曲线梁桥钢管混凝土桥墩的扭转效应研究[D].北京:清华大学, 2013(Wang Yuhang. Study on torsion effect in concrete filled steel tube piers of curved girder bridges[D]. Beijing:Tsinghua University, 2013(in Chinese))
[10]韩浩,廖飞宇,李永进.反复荷载下带脱空缺陷的钢管混凝土压弯构件的有限元模拟[C]//第25届全国结构工程学术会议论文集,包头.北京:工程力学, 2016(Han Hao, Liao Feiyu, Li Yongjin. Finite element modelling of concrete-filled steel tubular beam-columns with initial concrete imperfection under cyclic loading[C]//Proceedings of the 25th National Conference of Structural Engineering, Baotou. Beijing:Engineering Mechanics, 2016(in Chinese))
[11]唐九如.钢筋混凝土框架节点抗震[M].南京:东南大学出版社, 1989(Tang Jiuru. Seismic resistance of joints in reinforced concrete frames[M]. Nanjing:Southeast University Press, 1989(in Chinese))
[12]尧国皇.钢管混凝土构件在复杂受力状态下的工作机理研究[D].福州:福州大学, 2006(Yao Guohuang.Reasarch on behaiour of concrete-filled steel tubes subjected to complicated loading states[D]. Fuzhou:Fuzhou University, 2006(in Chinese))
[13] Attard M M, Setunge S. Stress-strain relationship of confined and unconfined concrete[J]. ACI Materials Journal, 1996, 93(5):432-442
[14]沈聚敏,王传志,江见鲸.钢筋混凝土有限元与板壳极限分析[M].北京:清华大学出版社, 1993
[15]滕智明,邹离湘.往复荷载下钢筋混凝土构件的非线性有限元分析[J].土木工程学报, 1996, 29(2):19-26(Teng Zhiming, Zou Lixiang. Nonlinear finite element analysis of RC members under reversed cyclic loading[J]. China Civil Engineering Journal, 1996, 29(2):19-26(in Chinese))
[16]刘威.钢管混凝土局部受压时的工作机理研究[D].福州:福州大学, 2005(Liu Wei. Resarch on mechanism of concrete-filled steel tubes subjected to local compression[D]. Fuzhou:Fuzhou University, 2006(in Chinese))
[2]Han L H,Li W,Bjorhovde R.Developments and advanced application of concrete-filled steel tubular(CFST)structures:Members[J]. Journal of Constructional Steel Research, 2014, 100:211-228
[3] Han L H, Li W, Ren Q X. Tests on inclined, tapered and STS concrete-filled steel tubular(CFST)stub columns[J]. Journal of Constructional Steel Research, 2010,66(10):1186-1195
[4] Liao F Y, Han L H, He S H. Behavior of CFST short column and beam with initial concrete imperfection:Experiments[J]. Journal of Constructional Steel Research, 2011, 67(12):1922-1935
[5] Liao F Y, Han L H, Tao Z. Behavior of CFST stub columns with initial concrete imperfection:Analysis and calculations[J]. Thin-walled Structures, 2013, 70:57-69
[6] Nie J G, Wang Y H, Fan J S. Experimental research on concrete filled steel tube columns under combined compression-bending-torsion cyclic load[J].Thin-Walled Structures, 2013, 67:1-14
[7] Wang Y H, Zhou X H. Non-linear torsion behaviour of concrete filled steel tube columns[J]. Materials&Structures, 2016, 49(12):5227-5241
[8] Wang Y H, Nie J G, Fan J S. Fiber beam-column element for circular concrete filled steel tube under axial-flexure-torsion combined load[J]. Journal of Constructional Steel Research, 2014, 95:10-21
[9]王宇航.曲线梁桥钢管混凝土桥墩的扭转效应研究[D].北京:清华大学, 2013(Wang Yuhang. Study on torsion effect in concrete filled steel tube piers of curved girder bridges[D]. Beijing:Tsinghua University, 2013(in Chinese))
[10]韩浩,廖飞宇,李永进.反复荷载下带脱空缺陷的钢管混凝土压弯构件的有限元模拟[C]//第25届全国结构工程学术会议论文集,包头.北京:工程力学, 2016(Han Hao, Liao Feiyu, Li Yongjin. Finite element modelling of concrete-filled steel tubular beam-columns with initial concrete imperfection under cyclic loading[C]//Proceedings of the 25th National Conference of Structural Engineering, Baotou. Beijing:Engineering Mechanics, 2016(in Chinese))
[11]唐九如.钢筋混凝土框架节点抗震[M].南京:东南大学出版社, 1989(Tang Jiuru. Seismic resistance of joints in reinforced concrete frames[M]. Nanjing:Southeast University Press, 1989(in Chinese))
[12]尧国皇.钢管混凝土构件在复杂受力状态下的工作机理研究[D].福州:福州大学, 2006(Yao Guohuang.Reasarch on behaiour of concrete-filled steel tubes subjected to complicated loading states[D]. Fuzhou:Fuzhou University, 2006(in Chinese))
[13] Attard M M, Setunge S. Stress-strain relationship of confined and unconfined concrete[J]. ACI Materials Journal, 1996, 93(5):432-442
[14]沈聚敏,王传志,江见鲸.钢筋混凝土有限元与板壳极限分析[M].北京:清华大学出版社, 1993
[15]滕智明,邹离湘.往复荷载下钢筋混凝土构件的非线性有限元分析[J].土木工程学报, 1996, 29(2):19-26(Teng Zhiming, Zou Lixiang. Nonlinear finite element analysis of RC members under reversed cyclic loading[J]. China Civil Engineering Journal, 1996, 29(2):19-26(in Chinese))
[16]刘威.钢管混凝土局部受压时的工作机理研究[D].福州:福州大学, 2005(Liu Wei. Resarch on mechanism of concrete-filled steel tubes subjected to local compression[D]. Fuzhou:Fuzhou University, 2006(in Chinese))
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