近场地震作用下轻型自复位消能摇摆刚架减震性能分析
发布时间：2019-05-15 12:34
【摘要】：具有薄弱层的结构在地震中极易发生层间失效,近场地震的速度脉冲等效应更加剧了这种局部破坏的可能性,严重制约结构整体抗震性能的发挥。摇摆结构作为一种新型的结构体系已经被证实具有良好的减震效果,其弱化了结构与基础之间的约束,并且依靠自重或者附加预应力索使结构在地震作用后自复位来消除残余变形。 针对传统摇摆墙自重大、建造复杂和自身地震作用大的缺点,提出了一种轻型自复位消能摇摆架(EDLRF),采用型钢或者钢管混凝土组成轻型摇摆刚架(LRF)作为刚度单元,自复位耗能支撑(SCED)为消能单元,将限制结构变形模式、耗能和自复位整合在一起,不仅降低了建造难度,而且便于震后修复安装。LRF使结构具有预期的可控制的损伤模式,并且将损伤集中在结构的底部,利用SCED耗能,降低结构的响应。本文主要研究内容如下： 针对EDLRF提出了一种基于刚度需求的设计方法,并考虑了近场地震的不利影响。分析不同周期框架结构的刚度需求,以控制结构一阶模态下的层间位移集中系数为性能目标,设计轻型消能摇摆架并基于性能的损伤指标对结构进行性态分析。考虑了近场和远场不同地震动下结构刚度需求与层数的关系,拟合出相应的计算公式和建议参数,据此设计LRF和SCED。 分析了结构从弹性阶段到破坏全过程的性能点指标参数,并对结构整体做易损性对比分析。对原结构和附加EDLRF的摇摆结构分别在近场和远场地震作用下进行增量动力分析(IDA),并且在不同的性能点处进行减震效果对比分析；基于IDA分析结果拟合出原结构和摇摆结构的地震动强度指数(IM)和损伤指数(DM)对数值的线性相关关系曲线,并依据对数正态分布假设,绘制了原结构和附加EDLRF的摇摆结构的易损性曲线,在不同的损伤状态从结构整体破坏概率上对比分析了原结构和摇摆结构的性能。 利用振动台试验验证了EDLRF的自振特性和减震有效性。制作钢框架模型和自复位消能摇摆架模型,在振动台输入天然近场地面激励,验证了摇摆结构的有效性。
[Abstract]:Structures with weak stories are prone to interstory failure in earthquakes, and the velocity pulse effect of near-field earthquakes aggravates the possibility of local failure, which seriously restricts the overall seismic performance of the structure. As a new type of structural system, rocking structure has been proved to have a good damping effect, which weakens the constraint between the structure and the foundation. And rely on self-weight or additional prestressed cable to make the structure reset after earthquake to eliminate residual deformation. In view of the shortcomings of the traditional swing wall, such as self-importance, complex construction and large seismic action, a light self-reset energy dissipation swing frame (EDLRF), is proposed, which uses section steel or concrete-filled steel tube to form a light swing rigid frame (LRF) as the stiffness element. The self-reset energy dissipation brace (SCED) is the energy dissipation unit, which integrates the deformation mode, energy consumption and self-reduction of the limited structure, which not only reduces the difficulty of construction, but also facilitates the repair and installation after the earthquake. LRF makes the structure have the expected controllable damage mode. The damage is concentrated at the bottom of the structure, and the energy consumption of SCED is used to reduce the response of the structure. The main contents of this paper are as follows: a design method based on stiffness requirement is proposed for EDLRF, and the adverse effects of near-field earthquakes are considered. The stiffness requirements of frame structures with different periods are analyzed. in order to control the interlaminar displacement concentration coefficient in the first mode of the structure, a light energy dissipation swing frame is designed and the behavior of the structure is analyzed based on the damage index of the performance. Considering the relationship between the stiffness requirement of the structure and the number of floors under different ground motion in the near field and the far field, the corresponding calculation formulas and suggested parameters are fitted, and the LRF and SCED. are designed according to the relationship between the stiffness requirements of the structure and the number of floors. The performance point parameters of the structure from the elastic stage to the failure process are analyzed, and the vulnerability of the structure as a whole is compared and analyzed. The incremental dynamic analysis (IDA), of the original structure and the rocking structure with EDLRF under the action of near-field and far-field earthquakes are carried out respectively, and the damping effects are compared and analyzed at different performance points. Based on the results of IDA analysis, the linear correlation curves between the ground motion intensity index (IM) and the damage index (DM) of the original structure and the rocking structure are fitted, and according to the logarithmic normal distribution hypothesis, The vulnerability curves of the original structure and the rocking structure with EDLRF are drawn, and the performance of the original structure and the rocking structure are compared and analyzed in terms of the overall failure probability of the structure in different damage states. The natural vibration characteristics and damping effectiveness of EDLRF are verified by shaking table test. The steel frame model and the self-reset energy dissipation swing frame model are made, and the natural near-field ground excitation is input into the shaking table to verify the effectiveness of the rocking structure.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.1
本文编号：2477510
[Abstract]:Structures with weak stories are prone to interstory failure in earthquakes, and the velocity pulse effect of near-field earthquakes aggravates the possibility of local failure, which seriously restricts the overall seismic performance of the structure. As a new type of structural system, rocking structure has been proved to have a good damping effect, which weakens the constraint between the structure and the foundation. And rely on self-weight or additional prestressed cable to make the structure reset after earthquake to eliminate residual deformation. In view of the shortcomings of the traditional swing wall, such as self-importance, complex construction and large seismic action, a light self-reset energy dissipation swing frame (EDLRF), is proposed, which uses section steel or concrete-filled steel tube to form a light swing rigid frame (LRF) as the stiffness element. The self-reset energy dissipation brace (SCED) is the energy dissipation unit, which integrates the deformation mode, energy consumption and self-reduction of the limited structure, which not only reduces the difficulty of construction, but also facilitates the repair and installation after the earthquake. LRF makes the structure have the expected controllable damage mode. The damage is concentrated at the bottom of the structure, and the energy consumption of SCED is used to reduce the response of the structure. The main contents of this paper are as follows: a design method based on stiffness requirement is proposed for EDLRF, and the adverse effects of near-field earthquakes are considered. The stiffness requirements of frame structures with different periods are analyzed. in order to control the interlaminar displacement concentration coefficient in the first mode of the structure, a light energy dissipation swing frame is designed and the behavior of the structure is analyzed based on the damage index of the performance. Considering the relationship between the stiffness requirement of the structure and the number of floors under different ground motion in the near field and the far field, the corresponding calculation formulas and suggested parameters are fitted, and the LRF and SCED. are designed according to the relationship between the stiffness requirements of the structure and the number of floors. The performance point parameters of the structure from the elastic stage to the failure process are analyzed, and the vulnerability of the structure as a whole is compared and analyzed. The incremental dynamic analysis (IDA), of the original structure and the rocking structure with EDLRF under the action of near-field and far-field earthquakes are carried out respectively, and the damping effects are compared and analyzed at different performance points. Based on the results of IDA analysis, the linear correlation curves between the ground motion intensity index (IM) and the damage index (DM) of the original structure and the rocking structure are fitted, and according to the logarithmic normal distribution hypothesis, The vulnerability curves of the original structure and the rocking structure with EDLRF are drawn, and the performance of the original structure and the rocking structure are compared and analyzed in terms of the overall failure probability of the structure in different damage states. The natural vibration characteristics and damping effectiveness of EDLRF are verified by shaking table test. The steel frame model and the self-reset energy dissipation swing frame model are made, and the natural near-field ground excitation is input into the shaking table to verify the effectiveness of the rocking structure.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.1
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