节能砌块隐形密框结构动力特性振动台试验研究
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摘要
通过节能砌块隐形密框结构3层楼房1/2模型振动台试验,用白噪声测定了各工况下结构的动力特性,并分析了其变化规律。结果表明:结构的刚度较大,在振动台输入峰值加速度达到0.82g时,模型结构基本上仍处于弹性阶段,结构自振频率没有急剧下降,结构的耗能性能较好,初始阻尼比较高。随着输入峰值加速度的上升,内部裂缝发展,结构的自振频率逐渐下降,周期逐渐增大,阻尼有所增长。
By means of shaking table test of 1/2 scaled three-storey building model of energy-saving block & invisible multi-ribbed frame structure,dynamic characteristics of the structure were measured by white-noise excitation under various operation conditions and its variation law was analyzed.The results show that structural stiffness is higher,and the structure is still in an elastic stage when the seismic excitations peak acceleration of shaking table reached 0.82g.Natural frequency does not decrease sharply,and the structure has better energy dissipation ability and higher initial damping ratio.With the rise of the seismic excitations peak acceleration,inner crack developes,natural frequency gradually decreases,natural vibration period gradually increases,and structure damping gradually increases.
By means of shaking table test of 1/2 scaled three-storey building model of energy-saving block & invisible multi-ribbed frame structure,dynamic characteristics of the structure were measured by white-noise excitation under various operation conditions and its variation law was analyzed.The results show that structural stiffness is higher,and the structure is still in an elastic stage when the seismic excitations peak acceleration of shaking table reached 0.82g.Natural frequency does not decrease sharply,and the structure has better energy dissipation ability and higher initial damping ratio.With the rise of the seismic excitations peak acceleration,inner crack developes,natural frequency gradually decreases,natural vibration period gradually increases,and structure damping gradually increases.
引文
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[2]袁泉,姚谦峰.密肋壁板轻框结构地震反应分析[J].工业建筑,2003,33(1):17-19,28.
[3]贾国成.木-混凝土混合结构模拟地震振动台试验研究[D].上海:同济大学,2008.
[4]熊海贝,倪春,吕西林,等.三层轻木-混凝土混合结构足尺模型模拟地震振动台试验研究[J].地震工程与工程振动,2008,28(1):91-98.
[5]施卫星,李振刚,李素贞,等.深圳罗湖商务大厦模型振动台对比试验[J].同济大学学报:自然科学版,2008,36(1):12-16.
[6]CHIN TUNG CHENG.Shaking table tests of a self-centering designed bridge substructure[J].EngineeringStructures,2008,30(12):3426-3433.
[7]SEUNG EOCK KIM,DONG HO LEE,CUONG NGOHUU.Shaking table tests of a two-story unbraced steelframe[J].Journal of Constructional Steel Research,2007,63(3):412-421.
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