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滞回恢复力模型中求折点的一种方法 被引量:9
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作者 肖明葵 刘纲 白绍良 《重庆大学学报(自然科学版)》 EI CAS CSCD 北大核心 2002年第1期13-16,共4页
对于在循环往复荷载作用下 ,结构具有滞回特性的力与变形关系曲线的简化折线型恢复力模型提出了一种求刚度突变点 ,即折点的处理方法。推导出应用Wilson -θ法及Newmark - β法求解结构动力反应时折线型恢复力模型中的加载点和卸载点这... 对于在循环往复荷载作用下 ,结构具有滞回特性的力与变形关系曲线的简化折线型恢复力模型提出了一种求刚度突变点 ,即折点的处理方法。推导出应用Wilson -θ法及Newmark - β法求解结构动力反应时折线型恢复力模型中的加载点和卸载点这两类折点的计算公式。该公式以结构动力方程为基础 ,计算折点时刻仅涉及结构在t时刻的动力特性、位移、速度及加速度反应 ,折点处结构位移值等已知量 ,计算中避免迭代 ,能得出较准确的折点出现时刻 ,且公式形式统一 ,便于计算机编程。 展开更多
关键词 恢复力学模型 折点 计算公式 建筑结构 循环往复荷载 滞回特性
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A system dynamics approach for studying the resilience of irrigation systems
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作者 Newton Paulo Bueno 《Chinese Business Review》 2010年第6期14-26,37,共14页
One of the most interesting outcomes from the recent collaboration between natural and social scientists is the concept of resilience, which imported from engineering to ecology. The problem with that concept is that ... One of the most interesting outcomes from the recent collaboration between natural and social scientists is the concept of resilience, which imported from engineering to ecology. The problem with that concept is that it is hard if not impossible to get simple measures for resilience as far as social-ecological systems are complex ones. Using a system dynamics model, the author shows that, for assessing resilience of systems like irrigation systems, it probably helps to see the process of resilience loss as a systemic one, in which dynamics is given by positive self-reinforcing loops, like the one we have labeled in this paper--the death spiral. The author also presents a list of symptoms of collapse in irrigation systems, in order to assess the resilience of those systems, and suggest some future avenues of research on the subject. 展开更多
关键词 system dynamics irrigation systems RESILIENCE institutions human-ecological footprint
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