钢筋混凝土框架抗震结构地震能量分布及耗散研究

Seismic Energy Distribution and Dissipation of Seismic Reinforced Concrete Frame Structure

基于能量平衡原理,对多层钢筋混凝土框架结构的地震输入能量的分布及耗散规律进行了研究。选用8条天然地震波和2条人工波,运用Perform-3D软件,对多层钢筋混凝土框架结构模型在7度罕遇地震作用下的弹塑性能量进行数值仿真计算。计算了钢混框架结构在不同地震波下的地震总输入能量、滞回耗能、阻尼耗能以及滞回耗能占总耗能的比例时程,分析了地震能量在各分量中的分布及分配规律;分析了阻尼比和延性比对地震输入能量的影响,确定了滞回耗能随阻尼比和延性比的变化规律;研究了钢筋混凝土框架结构梁柱构造和竖向侧移刚度变化对地震输入能及其分量的影响,确定了多层钢筋混凝土框架结构滞回耗能沿竖向的分布规律及沿横向在框架构件中的分配,研究了框架结构存在薄弱层情况下的滞回耗能的分布规律。揭示了多自由度钢筋混凝土框架结构地震输入能量及其分布规律,可为基于能量平衡原理的抗震设计理论在工程实际中的运用提供有益的参考。

According to the principle of energy balance, the distribution and dissipation of earth- quake input energy in the multi-storey reinforced concrete （RC） frame structure, which is most commonly used to resist earthquakes, were examined. Based on the Software Perform-3D, the numerical simulation of elastoplastic energy analysis of the structural model of this RC frame un- der seldom occurred earthquake of intensity 7 was carried out using 8 natural and 2 artificial earthquake waves. The total input energy of earthquake, the hysteretic energy dissipation, the damping energy and the time-histories of the ratio of the hysteretic energy to total disspated ener- gy were calculated, the distribution of seismic energy among the various energy components was analyzed. The influences of damping ratio and ductility ratio on the total earthquake input energy were discussed, and the hysteretic energy variations with damping ratio and ductility ratio were determined. The influence of construction of beam and column and lateral stiffness change of the reinforced concrete frame on the earthquake input energy and its components was researched, and the hysteretic energy variation in vertical direction of the structure and the distribution in the beams and columns were determined, the influence of a weak story in the five-story RC frame structure on the distribution of hysteretic energy was investigated. The results obtained in this paper present a beneficial reference to application of seismic design theory based on energy equi- librium principle to engineering practice.