单层球面网壳结构失效机理振动台试验
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摘要
为验证理论研究的正确性及考察网壳结构的强震失效机理,开展了单层球面网壳缩尺模型振动台试验,通过试验测定网壳结构的动力特性(固有频率和阻尼比)、测量网壳结构弹塑性阶段的动力响应(位移,加速度和应变等)、考察网壳结构在地震荷载作用下的动力响应以及结构的强震失效模式。根据试验结果可知,网壳结构抗震性能良好,试验模型倒塌前,塑性充分发展,经历了较长的结构受力性能不断削弱的过程,结构变形随荷载幅值的增加不断增大,可通过这些现象判定结构发生了动力强度破坏这一失效模式,从试验角度验证网壳结构失效模式的正确性。
To understand the mechanical behavior and failure mechanism of reticulated dome under earthquake action and verify the correctness of theoretical analysis,a shaking table test on single-layer reticulated dome was conducted.Firstly,a scale model of practical dome was designed according to the similarity principle,and then,its dynamic characteristics such as the nature vibration frequencies and the damping factors were measured.Finally,the responses of the reticulated dome due to both small and strong earthquake actions were observed.Test results show that single-layer reticulated dome has a good seismic performance.The plasticity of the model developed sufficiently with a continual decline in mechanical properties as well as a continual increase in deformation.The failure pattern was identified as the dynamic strength failure according to the phenomena in tests.Hence,the correctness of the failure pattern was verified by the test.
To understand the mechanical behavior and failure mechanism of reticulated dome under earthquake action and verify the correctness of theoretical analysis,a shaking table test on single-layer reticulated dome was conducted.Firstly,a scale model of practical dome was designed according to the similarity principle,and then,its dynamic characteristics such as the nature vibration frequencies and the damping factors were measured.Finally,the responses of the reticulated dome due to both small and strong earthquake actions were observed.Test results show that single-layer reticulated dome has a good seismic performance.The plasticity of the model developed sufficiently with a continual decline in mechanical properties as well as a continual increase in deformation.The failure pattern was identified as the dynamic strength failure according to the phenomena in tests.Hence,the correctness of the failure pattern was verified by the test.
引文
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[2]郭海山,沈世钊.单层网壳结构动力稳定性分析方法[J].建筑结构学报,2003,24(3):1-9(Guo Haishan,Shen Shizhao.Analysis method of dynamic stability of single layer reticulated domes[J].Journal of Building Structures,2003,24(3):1-9(in Chinese))
[3]王策,沈世钊.球面网壳阶跃荷载作用动力稳定性[J].建筑结构学报,2001,22(1):62-67(Wang Ce,Shen Shizhao.Dynamic stability of single layer reticulated dome under step load[J].Journal of Building Structures,2001,22(1):62-67(in Chinese))
[4]范峰,沈世钊.单层球壳模拟地震振动台试验及结构减振试验研究[J].哈尔滨建筑大学学报,2000,33(3):18-22(Fan Feng,Shen Shizhao.Study on the shaking table experiment and the vibration reducing experiment of single layer reticulated shells[J].Journal of Harbin University of C.E.&Architecture,2000,33(3):18-22(in Chinese))
[5]Murata M,Hirata M.Nonlinear dynamic analysis system for large-scale space frame structures under multiple loadings[C]//Proceedings of the IASS Symposium.Nagoya,2001
[6]邢佶慧,柳旭东,范锋,等.单层柱面网壳结构地震模拟振动台试验研究[J].建筑结构学报,2004,25(6):1-8(Xing Jihui,Liu Xudong,Fan Feng,et al.Shaking table experiment research on aseismic behavior of single-layer latticed cylindrical shell[J].Journal of Building Structures,2004,25(6):1-8(in Chinese))
[7]叶继红,沈祖炎.单层网壳结构的动力稳定实验研究[J].空间结构,1997,3(2):34-39(Ye Jihong,Shen Zuyan.Experiment research on dynamic stability of single layer latticed structures[J].Spatial Structures,1997,3(2):34-39(in Chinese))
[8]李忠学,沈祖炎,邓长根,等.钢网壳模型的动力稳定性振动台试验研究[J].实验力学,1999,14(4):484-491(Li Zhongxue,Shen Zuyan,Deng Changgen,et al.Research on the dynamic stability of steel reticulated shells via shaking table test[J].Journal of Experimental Mechanics,1999,14(4):484-491(in Chinese))
[9]秦乃兵,张毅刚,茹洋.采用新型阻尼杆的双层柱面网壳结构减震分析与试验研究[J].建筑结构学报,2005,26(6):108-113(Qin Naibing,Zhang Yigang,Ru Yang.Shaking table experimental study on earthquake resistance control of double-layer latticed cylindrical shell with new type damper elements[J].Journal of Building Structures,2005,26(6):108-113(in Chinese))
[10]梁海彤,吴金志,张毅刚.替换阻尼杆件的双层柱面网壳被动控制振动台试验研究[J].地震工程与工程振动,2003,23(4):178-182(Liang Haitong,Wu Jinzhi,Zhang Yigang.Shaking table experimental research on passive control of double-layer reticulated shell with some bottom chords replaced by dampers[J].Earthquake Engineering and Engineering Vibration,2003,23(4):178-182(in Chinese))
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