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李升才，李濤

（華僑大學(xué)土木工程學(xué)院，廈門 361021）

 

［摘要］通過節(jié)能砌塊隱形密框結(jié)構(gòu)3層樓房1/2模型振動(dòng)臺(tái)試驗(yàn)，用白噪聲測定了各工況下結(jié)構(gòu)的動(dòng)力特性，并分析了其變化規(guī)律。結(jié)果表明：結(jié)構(gòu)的剛度較大，在振動(dòng)臺(tái)輸入峰值加速度達(dá)到0.82g時(shí)，模型結(jié)構(gòu)基本上仍處于彈性階段，結(jié)構(gòu)自振頻率沒有急劇下降，結(jié)構(gòu)的耗能性能較好，初始阻尼比較高。隨著輸入峰值加速度的上升，內(nèi)部裂縫發(fā)展，結(jié)構(gòu)的自振頻率逐漸下降，周期逐漸增大，阻尼有所增長。

［關(guān)鍵詞］節(jié)能砌塊隱形密框結(jié)構(gòu)；振動(dòng)臺(tái)試驗(yàn)；白噪聲；動(dòng)力特性

中圖分類號(hào)：TU317+.1，TU398+.9文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2012)09-0131-03

 

Li Shengcai, Li Tao

( School of Civil Engineering, Huaqiao University, Xiamen 361021, China)

 

Abstract: 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.

Keywords: energy-saving block & invisible multi-ribbed frame structure; shaking table test; white-noise; dynamic characteristic

*國家自然科學(xué)基金資助項(xiàng)目（50948036），福建省自然科學(xué)基金計(jì)劃項(xiàng)目（E0810022），福建省科技計(jì)劃重點(diǎn)項(xiàng)目（2012H0028）。

作者簡介：李升才，博士，教授，Email: lsc50605@hqu.edu.cn。

 

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