面向损伤控制的减震结构体系阻尼比解析计算及性能设计
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TU352.11;TU391

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国家自然科学基金资助项目(51878017,51978021);国家重点研发计划(2017YFC1500604,2017YFC1500603)


Damage control oriented damping ratio analytical calculation and performance design of damping structure system
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    摘要:

    与基于力、基于位移及基于能量的设计方法相比,基于损伤的结构抗震设计方法能够更全面直接地确定或评估结构抗震性能。由于缺乏消能部件附加等效阻尼比与主体结构损伤程度之间的关系表征,目前基于损伤的减震结构性能设计方法只能通过消能器设计参数的迭代调整分析实现预期损伤。针对以上不足,从能量耗散角度剖析了减震结构主体部分损伤机理,通过弹塑性耗能差率损伤模型建立减震结构附加等效阻尼比与损伤指数之间的定量关系,并提出消能部件在地震动下的动态附加等效阻尼比计算方法。在此基础上结合地震易损性分析方法提出面向损伤控制的减震结构体系性能设计流程。通过算例表明阻尼比解析计算准确,该流程具有通用简便、不需迭代等优点,能够将主体结构的损伤程度有效控制至预期损伤目标。该方法也可以兼容基于位移的设计方法,且具有更严格的概率统计意义。

    Abstract:

    Compared with the design methods based on force,displacement and energy,the design method based on damage can determine or evaluate the seismic performance of the structure more comprehensively and directly. Due to the lack of the relationship between additional damping ratio of the dampers and the damage degree of the primary structure,the current performance design method based on the damage for the controlled structure system can only achieve the expected damage by iteratively calculating and constantly adjusting the design parameters of the dampers. Because of those shortages,the mechanism of damage reduction of the main structure is analyzed from the perspective of energy dissipation. Then the quantitative relationship between the additional equivalent damping ratio and the damage index of the structure is established by using the damage model based on differential ratio of elastic-plastic dissipated energy. Furthermore,the calculation method of periodic additional equivalent damping ratio of dampers under ground motion is proposed. On this basis,the performance design flow of the controlled structure system oriented to damage control is proposed based on seismic fragility analysis method. The example shows that the analytical calculation of damping ratio is accurate,and the design method is universal,simple and iteration-free,which can effectively control the damage degree of the primary structure to the expected damage target. The design method in this paper can also be compatible with displacement based on design method,and has more strict probability and statistical significance.

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王宝顺,何浩祥,闫维明.面向损伤控制的减震结构体系阻尼比解析计算及性能设计[J].振动工程学报,2022,35(2):264~276.[WANG Bao-shun, HE Hao-xiang, YAN Wei-ming. Damage control oriented damping ratio analytical calculation and performance design of damping structure system[J]. Journal of Vibration Engineering,2022,35(2):264~276.]

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  • 在线发布日期: 2022-05-31
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