RC框架结构连续倒塌动力响应影响因素分析

发布时间：2018-04-24 20:27

本文选题：连续倒塌 + 非线性动力分析　；参考：《哈尔滨工业大学学报》2017年06期

【摘要】：在极端荷载作用下,结构局部会发生初始损伤.由于初始损伤会在不同结构构件间发生传递,可能会引发结构整体的连续倒塌,造成重大经济损失和人员伤亡.为评估结构的抗连续倒塌能力,通常采用拆除构件法对结构在某一构件发生失效后的整体承载能力进行分析.拆除构件法包括非线性静力Pushdown分析方法和非线性动力分析方法.本文对拆除构件法中非线性动力分析方法的主要影响因素进行研究.选择一个按中国规范设计的五层三跨钢筋混凝土框架结构作为研究对象,分析框架柱失效时长、重力荷载分布形式以及动力加载方式对结构在瞬间失柱条件下非线性动力反应的影响.研究结果表明:柱失效时长对结构非线性动力反应影响显著,当失效时长大约为结构自振周期的0.5倍时,结构非线性反应的动力效应几乎消失;采用不同重力荷载分布形式(满跨分布和受损跨分布)对结构的非线性动力反应影响并不明显;与先加载后移柱的动力加载方式相比,采用先移柱再加载的动力加载方式会放大结构的非线性动力反应,但放大效应有限.
[Abstract]:Under extreme loads, initial damage will occur locally. Due to the transmission of initial damage between different structural members, it may lead to the continuous collapse of the whole structure, resulting in significant economic losses and casualties. In order to evaluate the continuous collapse resistance of a structure, the method of removing the component is usually used to analyze the overall bearing capacity of the structure after the failure of a member. The method includes nonlinear static Pushdown analysis and nonlinear dynamic analysis. In this paper, the main influencing factors of nonlinear dynamic analysis method in the method of removing components are studied. A five-story and three-span reinforced concrete frame structure designed according to China Code is selected as the research object, and the failure time of frame column is analyzed. The influence of the distribution of gravity load and the dynamic loading on the nonlinear dynamic response of the structure under the condition of instantaneous column loss. The results show that the failure time of the column has a significant effect on the nonlinear dynamic response of the structure, and when the failure time is about 0.5 times of the natural vibration period of the structure, the dynamic effect of the nonlinear response of the structure almost disappears. Different distribution forms of gravity load (full span distribution and damaged span distribution) have little effect on the nonlinear dynamic response of the structure. The nonlinear dynamic response of the structure can be amplified by the dynamic loading method of moving column and then loading, but the amplification effect is limited.
【作者单位】：哈尔滨工业大学土木工程学院;广西华景城建筑设计有限公司;
【基金】：国家自然科学基金(51408155) 中国博士后科学基金(2014M551251) 黑龙江省博士后基金(LBH-Z14114)
【分类号】：TU311.3;TU375.4

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