装配式轻钢框架-轻钢桁架结构振动台试验研究
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摘要
为研究装配式轻钢框架-轻钢桁架结构的抗震性能及桁架式"L"形柱的震坏机理,进行了一座两层房屋的足尺模型振动台试验.对模型进行42个工况的地震波输入,运用模态分析理论识别了模型结构的动力特性,分析了加速度响应、位移响应和应变响应的变化规律.研究表明:在地震波加速度峰值从0.07g逐渐增大到0.9g的过程中,结构自振频率逐步下降;加速度放大系数逐渐降低;最大层间位移出现在首层,在8度基本地震动和8度罕遇地震动时的最大层间位移角分别为1/268和1/164,低于多层钢结构的弹性层间位移角限值和弹塑性层间位移角限值;结构能满足"两阶段、三水准"的抗震设防要求.模型中的桁架式"L"形柱在8度基本地震动时处于弹性状态,在8度罕遇地震动时有部分桁架节点处焊缝开裂并进入塑性状态,在9度罕遇地震动时结构塑性变形加大但仍有一定安全储备,在9度极罕遇地震动时刚度严重退化.结构在经历了渐进的塑性变形过程后,仍保持一定的承载能力,具有较好的延性,可在高设防烈度地区应用.
In order to study the aseismic performance of prefabricated light steel frame with light steel truss structure and the seismic failure mechanism of truss-type L-shaped column, full-scale shaking table tests were performed on a two-story building model. Seismic waves in 42 events were input to model structure. The dynamic properties of model structure was quantified by model analysis theories. The change regularity of acceleration responses, displacement responses, and strain responses were analyzed. Results show that with the peak acceleration of seismic waves increasing from 0.07g to 0.9g, both the fundamental frequency and the acceleration magnification factor of the structure decreased gradually. The maximum inter-story drift occurred in the first floor, and the maximum inter-story drift ratios under basis ground motion and rare ground motion of 8-degree was 1/268 and 1/164, respectively, which were lower than the elastic and elastic-plastic inter-story drift ratio limits of multistory steel structure. The model structure can basically satisfy the two-phase and three-level seismic fortification requirements. The truss-type L-shaped column in the model was in elastic state under basis ground motion of 8 degree. Crack was found at the junctions between end column and diagonal member under rare ground motion of 8 degree. At the same time, the L-shaped column enter plastic stage, although the plastic drift increased under rare ground motion of 9 degree and a certain safety margin was remained. The lateral stiffness of L-shaped column degraded severely under very rare ground motion of 9 degree. After the gradual process of plastic deformation, the L-shaped column retained a certain level of carrying capacity, so it has good ductility and can be used in seismic fortification region of high degree.
In order to study the aseismic performance of prefabricated light steel frame with light steel truss structure and the seismic failure mechanism of truss-type L-shaped column, full-scale shaking table tests were performed on a two-story building model. Seismic waves in 42 events were input to model structure. The dynamic properties of model structure was quantified by model analysis theories. The change regularity of acceleration responses, displacement responses, and strain responses were analyzed. Results show that with the peak acceleration of seismic waves increasing from 0.07g to 0.9g, both the fundamental frequency and the acceleration magnification factor of the structure decreased gradually. The maximum inter-story drift occurred in the first floor, and the maximum inter-story drift ratios under basis ground motion and rare ground motion of 8-degree was 1/268 and 1/164, respectively, which were lower than the elastic and elastic-plastic inter-story drift ratio limits of multistory steel structure. The model structure can basically satisfy the two-phase and three-level seismic fortification requirements. The truss-type L-shaped column in the model was in elastic state under basis ground motion of 8 degree. Crack was found at the junctions between end column and diagonal member under rare ground motion of 8 degree. At the same time, the L-shaped column enter plastic stage, although the plastic drift increased under rare ground motion of 9 degree and a certain safety margin was remained. The lateral stiffness of L-shaped column degraded severely under very rare ground motion of 9 degree. After the gradual process of plastic deformation, the L-shaped column retained a certain level of carrying capacity, so it has good ductility and can be used in seismic fortification region of high degree.
引文
[1]陈志华, 荣彬. L形方钢管混凝土组合异形柱的轴压稳定性研究[J]. 建筑结构, 2009, 39(6): 39CHEN Zhihua, RONG Bin. Research on axial compression stability of L-shaped column composed of concrete-filled square steel tubes[J]. Building Structure, 2009, 39(6): 39
[2]王亚雯, 陈志华, 周婷, 等. 反复荷载下方钢管混凝土组合异形柱参数分析[J]. 地震工程与工程振动, 2014, 34(3): 126WANG Yawen, CHEN Zhihua, ZHOU Ting, et al. Parametric analysis of special-shaped column composed of concrete-filled square steel tubes under cyclic loading [J]. Earthquake Engineering and Engineering Dynamics, 2014, 34(3): 126. DOI:10.13197/j.eeev.2014.03.126.wangyw.017
[3]蔡健, 孙刚. 轴压下带约束拉杆L形钢管混凝土短柱的试验研究[J]. 土木工程学报, 2008, 41(9): 14CAI Jian, SUN Gang. Experimental investigation on L-shaped concrete-filled steel tube stub columns with binding bars under axial load [J]. China Civil Engineering Journal, 2008, 41(9): 14. DOI:10.3321/j.issn:1000-131X.2008.09.003
[4]蔡健, 左志亮, 赵小芹, 等. 带约束拉杆L形钢管混凝土短柱偏压试验研究[J]. 建筑结构学报, 2011, 32(2): 83CAI Jian, ZUO Zhiliang, ZHAO Xiaoqin, et al. Experimental research on eccentrically loaded L-shaped concrete-filled steel tubular stub columns with binding bars [J]. Journal of Building Structures, 2011, 32(2): 83. DOI:10.14006/j:jzjgxb.2011.02.013
[5]柳杨青, 王恒华, 蔡建国, 等. 闭口截面异形柱轴心受压稳定系数[J]. 东南大学学报(自然科学版), 2015, 45(5): 923LIU Yangqing, WANG Henghua, CAI Jianguo, et al. Stability coefficient of closed special-shaped column under axial compression [J]. Journal of Southeast University (Natural Science Edition), 2015, 45(5): 923. DOI:10.3969/j.issn.1001-0505.2015.05.018
[6]混凝土异形柱结构技术规程: JGJ 149—2017[S]. 北京: 中国建筑工业出版社, 2017: 2Technical specification for concrete structures with specially shaped columns: JGJ 149—2017[S]. Beijing: China Architecture & Building Press, 2017: 2
[7]刘永健, 刘君平, 张俊光. 主管内填混凝土矩形和圆形钢管桁架受弯性能对比试验研究[J]. 建筑结构学报, 2010, 31(4): 86LIU Yongjian, LIU Junping, ZHANG Junguang. Experimental research on RHS and CHS truss with concrete filled chord[J]. Journal of Building Structures, 2010, 31(4): 86
[8]黄政华, 张其林, 杨宗林, 等. 平面钢管桁架的面外稳定分析模型研究[J]. 土木工程学报, 2011, 44(5): 49HUANG Zhenghua, ZHANG Qilin, YANG Zonglin, et al. Study of model for out-of-plane stability of planar tubular trusses [J]. China Civil Engineering Journal, 2011, 44(5): 49. DOI:10.15951/j.tmgcxb.2011.05.015
[9]中国地震动参数区划图: GB 18306—2015[S]. 北京: 中国标准出版社, 2015: 3Seismic ground motion parameters zonation map of China: GB 18306—2015 [S]. Beijing: Standard Press of China, 2017: 3
[10]荣彬, 陈志华, 李黎明. L形截面方钢管组合异形柱的长细比计算[J]. 钢结构, 2006, 21(4): 8RONG Bin, CHEN Zhihua, LI Liming. Calculation of slenderness ratio for L-shaped combined column of square steel tubes[J]. Steel Construction, 2006, 21(4): 8. DOI:10.3969/j.issn.1007-9963.2006.04.003
[11]曹万林, 王如伟, 刘文超, 等. 装配式轻型钢管框架-轻墙共同工作性能[J]. 哈尔滨工业大学学报, 2017, 49(12): 61CAO Wanlin, WANG Ruwei, LIU Wenchao, et al. Experimental study of joint work characteristic of assembly light steel tube frame with recycled concrete-thin wall[J]. Journal of Harbin Institute of Technology, 2017, 49(12): 61. DOI:10.11918/j.issn.0367-6234.201612064
[12]建筑抗震设计规范(2016年版): GB 50011—2010[S]. 北京: 中国建筑工业出版社, 2010: 342Code for seismic design of buildings(2016 edition): GB 50011—2010[S]. Beijing: China Architecture & Building Press, 2010: 342
[13]黄浩华. 地震模拟振动台的设计与应用技术[M]. 北京: 地震出版社, 2008: 317HUANG Haohua. Design and application of seismic simulated shaking table [M]. Beijing: Seismological Press, 2008: 317
[14]李国强, 李杰. 工程结构动力检测理论与应用[M]. 北京: 科学出版社, 2002: 24LI Guoqiang, LI Jie. Theory and application of dynamic testing of engineering structure [M]. Beijing: Science Press, 2002: 24
[2]王亚雯, 陈志华, 周婷, 等. 反复荷载下方钢管混凝土组合异形柱参数分析[J]. 地震工程与工程振动, 2014, 34(3): 126WANG Yawen, CHEN Zhihua, ZHOU Ting, et al. Parametric analysis of special-shaped column composed of concrete-filled square steel tubes under cyclic loading [J]. Earthquake Engineering and Engineering Dynamics, 2014, 34(3): 126. DOI:10.13197/j.eeev.2014.03.126.wangyw.017
[3]蔡健, 孙刚. 轴压下带约束拉杆L形钢管混凝土短柱的试验研究[J]. 土木工程学报, 2008, 41(9): 14CAI Jian, SUN Gang. Experimental investigation on L-shaped concrete-filled steel tube stub columns with binding bars under axial load [J]. China Civil Engineering Journal, 2008, 41(9): 14. DOI:10.3321/j.issn:1000-131X.2008.09.003
[4]蔡健, 左志亮, 赵小芹, 等. 带约束拉杆L形钢管混凝土短柱偏压试验研究[J]. 建筑结构学报, 2011, 32(2): 83CAI Jian, ZUO Zhiliang, ZHAO Xiaoqin, et al. Experimental research on eccentrically loaded L-shaped concrete-filled steel tubular stub columns with binding bars [J]. Journal of Building Structures, 2011, 32(2): 83. DOI:10.14006/j:jzjgxb.2011.02.013
[5]柳杨青, 王恒华, 蔡建国, 等. 闭口截面异形柱轴心受压稳定系数[J]. 东南大学学报(自然科学版), 2015, 45(5): 923LIU Yangqing, WANG Henghua, CAI Jianguo, et al. Stability coefficient of closed special-shaped column under axial compression [J]. Journal of Southeast University (Natural Science Edition), 2015, 45(5): 923. DOI:10.3969/j.issn.1001-0505.2015.05.018
[6]混凝土异形柱结构技术规程: JGJ 149—2017[S]. 北京: 中国建筑工业出版社, 2017: 2Technical specification for concrete structures with specially shaped columns: JGJ 149—2017[S]. Beijing: China Architecture & Building Press, 2017: 2
[7]刘永健, 刘君平, 张俊光. 主管内填混凝土矩形和圆形钢管桁架受弯性能对比试验研究[J]. 建筑结构学报, 2010, 31(4): 86LIU Yongjian, LIU Junping, ZHANG Junguang. Experimental research on RHS and CHS truss with concrete filled chord[J]. Journal of Building Structures, 2010, 31(4): 86
[8]黄政华, 张其林, 杨宗林, 等. 平面钢管桁架的面外稳定分析模型研究[J]. 土木工程学报, 2011, 44(5): 49HUANG Zhenghua, ZHANG Qilin, YANG Zonglin, et al. Study of model for out-of-plane stability of planar tubular trusses [J]. China Civil Engineering Journal, 2011, 44(5): 49. DOI:10.15951/j.tmgcxb.2011.05.015
[9]中国地震动参数区划图: GB 18306—2015[S]. 北京: 中国标准出版社, 2015: 3Seismic ground motion parameters zonation map of China: GB 18306—2015 [S]. Beijing: Standard Press of China, 2017: 3
[10]荣彬, 陈志华, 李黎明. L形截面方钢管组合异形柱的长细比计算[J]. 钢结构, 2006, 21(4): 8RONG Bin, CHEN Zhihua, LI Liming. Calculation of slenderness ratio for L-shaped combined column of square steel tubes[J]. Steel Construction, 2006, 21(4): 8. DOI:10.3969/j.issn.1007-9963.2006.04.003
[11]曹万林, 王如伟, 刘文超, 等. 装配式轻型钢管框架-轻墙共同工作性能[J]. 哈尔滨工业大学学报, 2017, 49(12): 61CAO Wanlin, WANG Ruwei, LIU Wenchao, et al. Experimental study of joint work characteristic of assembly light steel tube frame with recycled concrete-thin wall[J]. Journal of Harbin Institute of Technology, 2017, 49(12): 61. DOI:10.11918/j.issn.0367-6234.201612064
[12]建筑抗震设计规范(2016年版): GB 50011—2010[S]. 北京: 中国建筑工业出版社, 2010: 342Code for seismic design of buildings(2016 edition): GB 50011—2010[S]. Beijing: China Architecture & Building Press, 2010: 342
[13]黄浩华. 地震模拟振动台的设计与应用技术[M]. 北京: 地震出版社, 2008: 317HUANG Haohua. Design and application of seismic simulated shaking table [M]. Beijing: Seismological Press, 2008: 317
[14]李国强, 李杰. 工程结构动力检测理论与应用[M]. 北京: 科学出版社, 2002: 24LI Guoqiang, LI Jie. Theory and application of dynamic testing of engineering structure [M]. Beijing: Science Press, 2002: 24