【摘要】：為多角度揭示地震對結(jié)構(gòu)的破壞作用,從能量角度研究了單自由度非線性體系的地震響應(yīng)及其特征.通過Matlab編制了基于雙線性滯回模型的單自由度體系地震能量響應(yīng)分析程序,計算分析了汶川地震波激勵下某RC彈塑性結(jié)構(gòu)的能量響應(yīng)時程及能量占比時程.研究表明,滯回耗能和阻尼耗能是結(jié)構(gòu)耗能主要方式.總輸入能和滯回耗能總體遞增,而阻尼耗能則單調(diào)遞增,各能量項(xiàng)在總輸入能中的占比主要由滯回耗能控制.結(jié)構(gòu)初始剛度對各項(xiàng)能量響應(yīng)及其最終占比有重要影響.在某特定剛度值下結(jié)構(gòu)總輸入能會達(dá)到峰值,且滯回耗能及其最終占比也將達(dá)到最大,偏離該特定剛度值兩者都將減小.滯回耗能和阻尼耗能的占比時程,在振動初期波動較為劇烈;進(jìn)入強(qiáng)震階段后,當(dāng)初始剛度較小時,兩者占比相對穩(wěn)定,而當(dāng)剛度較大時,兩者占比則有一定波動.
[Abstract]:In order to reveal the damage effect of earthquake on structure from many angles, the seismic response and characteristics of single degree of freedom nonlinear system are studied from the point of view of energy. The seismic energy response analysis program of a single-degree-of-freedom system based on bilinear hysteretic model is compiled by Matlab. The energy response time history and energy ratio time history of a RC elastic-plastic structure excited by Wenchuan seismic wave are calculated and analyzed. The results show that hysteretic energy consumption and damping energy consumption are the main ways of structural energy consumption. The total input energy and hysteretic energy consumption increase as a whole, while the damping energy consumption increases monotonously. The proportion of each energy term in the total input energy is mainly controlled by hysteretic energy consumption. The initial stiffness of the structure has an important influence on the energy response and its final proportion. Under a specific stiffness value, the total input energy of the structure will reach the peak, and the hysteretic energy consumption and its final ratio will also reach the maximum, and the deviation from the specific stiffness value will be reduced. The proportion time history of hysteretic energy consumption and damping energy consumption fluctuates violently at the initial stage of vibration. After entering the strong earthquake stage, when the initial stiffness is small, the proportion of the two is relatively stable, while when the stiffness is large, the proportion of the two fluctuates to a certain extent.
【作者單位】： 長沙理工大學(xué)土木與建筑學(xué)院;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計劃(973計劃)項(xiàng)目(2015CB057706;2015CB057705) 國家自然科學(xué)基金項(xiàng)目(51108044) 湖南省教育廳科學(xué)研究項(xiàng)目(15C0053) 湖南省交通科技項(xiàng)目(201419) 長沙理工大學(xué)土木工程創(chuàng)新性項(xiàng)目(15ZDXK09)
【分類號】：TU311.3

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