【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。更多还原

【Abstract】 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.更多还原