钢筋混凝土消能减震框架结构抗地震倒塌易损性分析

发布时间：2018-01-25 02:02

本文关键词： 黏滞流体阻尼器钢筋混凝土抗震设计框架结构钢筋混凝土减震设计框架结构增量动力时程分析抗倒塌易损性　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：与传统抗震设计不同,结构的减震设计通过在结构上设置减震装置,利用减震装置消耗地震能量,达到减轻主体结构地震响应的目的。无论是采用减震设计的结构还是抗震设计的结构都需要满足“大震不倒”的抗震要求,并还需具有足够的抗倒塌安全储备来抵抗可能遭遇的更大地震下的倒塌破坏。当黏滞流体阻尼器应用于既有建筑物的加固时,由于黏滞流体阻尼器对结构只附加阻尼而不附加刚度,加固后结构的抗震与抗倒塌性能必然是优于原结构的；当黏滞流体阻尼器应用于新建建筑物时,该结构截面尺寸或配筋较相同地震作用下抗震设计的结构有一定的优化减小,考虑减震设计结构截面配筋优化后,阻尼器对减震设计结构抗倒塌性能的提升作用有多大,需要进一步研究。本文以钢筋混凝土框架结构为例,通过基于动力增量时程分析的抗地震倒塌易损性分析方法,对采用黏滞流体阻尼器减震设计结构的抗地震倒塌能力进行相关分析研究,定量对比分析了减震设计结构和抗震设计结构的抗地震倒塌性能,主要研究工作和成果如下：(1)根据我国现行抗震规范按设防烈度为7.5度、8度和8.5度分别设计了6层和9层抗震设计钢筋混凝土框架结构,并按照主体结构地震作用降半度的消能减震设计目标设计了相应的减震设计结构,消能减震设计采用黏滞流体阻尼器。采用MARC软件建立各结构的弹塑性分析模型。(2)对附设线性黏滞流体阻尼器和非线性黏滞流体阻尼器减震设计结构的抗倒塌能力进行对比研究。分析了附设线性黏滞流体阻尼器减震设计结构抗地震倒塌能力弱于附设非线性黏滞流体阻尼器减震设计结构的原因,发现线性黏滞流体阻尼器与非线性黏滞流体阻尼器相比虽然能够提供较大的附加阻尼力,但同时阻尼器对连接柱的附加轴力作用也很明显,导致结构底层柱更易发生破坏,从而降低结构的抗地震倒塌能力。(3)对不同设防烈度抗震设计和减震设计结构的抗倒塌能力进行评价研究。研究发现不同设防烈度下抗震设计与减震设计结构都能满足“大震不倒”性能要求,且都具有足够的抗倒塌安全储备。设防烈度8度和8.5度时,抗震设计与减震设计结构甚至能够满足“特大震不倒”性能要求,而设防烈度7.5度时,抗震设计与减震设计结构在特大震下的抗倒塌能力略显不足。(4)对不同设防烈度下减震设计结构与抗震设计结构抗倒塌能力进行对比研究。研究结果表明,设防烈度7.5度时,减震设计框架结构的抗倒塌能力强于抗震设计框架结构；而设防烈度8度和8.5度时,采用常规减震设计方法设计的减震结构由于梁、柱构件配筋的优化减少可能出现抗倒塌能力与抗震设计结构相比偏弱的现象。(5)通过对比减震设计结构与抗震设计结构的倒塌模式和塑性耗能需求发现,阻尼器对减震设计结构的塑性耗能分布有两方面的影响：一是大量减少梁、柱构件总的塑性耗能需求；二是影响结构塑性耗能沿楼层的分布,使结构塑性耗能更集中于底层部位,设防烈度越高,这种现象越明显。因此,建议高烈度区的减震设计结构通过加强底层柱的配筋来提高其抗倒塌能力,通过验证发现,加强减震设计结构底层柱配筋能够有效提升其抗倒塌能力。
[Abstract]:Different from the traditional seismic design, seismic design of structures by the damping device is arranged in the structure, the damping device consumes the earthquake energy, reduce the earthquake response of the main structure of the objective. Whether the structure seismic design or seismic design of the structure to satisfy the requirements of seismic earthquake does not fall, and also need to have enough the collapse margin against a larger earthquake collapse may encounter the damage. When the viscous fluid damper applied to the reinforcement of existing buildings, due to viscous fluid damper only added damping of the structure without additional stiffness, the strengthened structure anti-seismic and anti collapse performance is better than the original structure; when the viscous fluid damper used in the new building, the structure section size or reinforcement than under the same earthquake seismic design has reduced some optimization considering shock The design of structure reinforcement after the optimization of damper on seismic design of structural collapse resistance to enhance the role of performance is much, need further study. In this paper, the reinforced concrete frame structure as an example, based on the incremental dynamic time history analysis of the seismic collapse fragility analysis method, correlation analysis study on the anti seismic fluid viscous dampers seismic design of structure collapse, a quantitative analysis of the anti seismic isolation design structure and the seismic design of structure collapse performance, the main research work and results are as follows: (1) according to the current seismic code according to the fortification intensity is 7.5 degrees, 8 degrees and 8.5 degrees respectively designed 6 layers and 9 layers of reinforced concrete aseismic design frame structure, and in accordance with the main structure of the earthquake effect reduced half degree energy dissipation design target design of seismic design of structure, design of energy dissipation by viscous flow damping body . using MARC software to establish the analysis model of the structure of the plastic bomb. (2) the comparative study of a linear viscous fluid damper and nonlinear viscous fluid damper design the collapse resistance of the structure is analyzed. A linear viscous fluid damper design of structure seismic collapse resistance to weak with non-linear viscous lag reasons the fluid damper design structure, it was found that the linear viscous fluid damper with nonlinear fluid viscous dampers can provide additional damping force compared to the larger, but the additional axial damper on the connecting column with work is also very obvious, resulting in the underlying structure of column is more prone to damage, so as to reduce the seismic collapse resistance of structures. (3) to evaluate and study different fortification intensity seismic design and seismic design of the collapse resistance of the structure. The study found that the design and the seismic fortification intensity under different damping The design structure can meet the earthquake inverted performance requirements, and have enough safety against collapse reserves. Fortificationintensity is 8 degree and 8.5 degree, seismic design and seismic design of structure and satisfy the "large earthquake without collapse performance requirements, and the fortification intensity of 7.5 degrees, the seismic design and seismic design the structure in the large earthquake under the anti collapse capacity insufficient. (4) the comparative study of different fortification intensity seismic design and seismic design of structure collapse resistant capacity of structures. The results show that the seismic fortification intensity of 7.5 degrees, seismic design of frame structure of anti collapse ability in the seismic design of frame structure; and the fortification intensity of 8 and 8.5 degrees, the structure design of conventional seismic design methods due to the beam column reinforcement, optimization and reduce the possible anti collapse capacity compared with the seismic design of the structure of weak phenomenon. (5) by comparing the damping. The structure and the seismic design of the structure collapse mode and plastic energy demand, damper on seismic design of the structure of plastic has two implications of energy distribution: one is to reduce the amount of beam column, the total plastic energy demand; two is the distribution structure of plastic energy dissipation along the floor, so that the structure of the plastic energy is more concentrated in the lower part, fortification intensity is high, this phenomenon is more obvious. Therefore, suggestions for seismic design of structures in high intensity region through the reinforcement of column to improve its anti collapse ability, it was proved that strengthening the seismic design of structure of bottom layer column reinforcement can effectively enhance the ability of anti collapse.

【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375.4;TU352.11

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