论文部分内容阅读
基于改进的大质量法和位移法,分别求解非一致地震动激励下结构总反应和拟静力分量,用总反应减去拟静力分量得到动力分量,实现拟静力/动力分量的分离。结果表明,该方法简便实用,计算精度高,与理论结果符合好。以一座连续刚构桥为例,分析了非一致地震动激励下,结构地震反应拟静力/动力分量的基本特征和影响因素。结果表明,各支撑间的地震动位移差动对拟静力分量影响巨大,不容忽视;拟静力分量/动力分量相互叠加或消减,致使结构反应在多点激励作用下表现复杂。
Based on the improved mass method and displacement method, the total structure response and the quasi-static component under non-uniform ground motions are respectively solved. The quasi-static component is deducted from the total reaction to obtain the quasi-static component and the quasi-static / dynamic component is separated. The results show that the method is simple and practical, the calculation accuracy is high, which is in good agreement with the theoretical results. Taking a continuous rigid frame bridge as an example, the basic characteristics and influencing factors of quasi-static / dynamic components of seismic response under non-uniform ground motions are analyzed. The results show that the difference of ground motion displacement between support members has great influence on the quasi-static component, which can not be neglected. The quasi-static component / dynamic component superposes or abates, which makes the structure response complicated under multi-point excitation.