基于损伤理论的砌体结构房屋性能化抗震设计研究

发布时间：2018-04-08 17:45

本文选题：砌体结构　切入点：损伤本构关系模型　出处：《郑州大学》2014年博士论文

【摘要】：砌体结构房屋作为一种整体性差、刚度大、抗震性能差且应用广泛的结构形式，抗震设计理论的更新与发展更显迫切。为顺应性能化抗震设计理论的发展，需要加强砌体结构性能化抗震设计方法的研究。在此背景下，本文开展了砌体结构房屋性能化抗震设计研究。本文工作是以砌体结构房屋震害总结为出发点，以砌体结构损伤本构模型研究为主线，以砌体结构房屋性能化抗震设计和性态水准的定量划分为重点开展的。本文的主要工作如下： 1砌体结构震害总结与抗震设计方法的发展根据大量震害资料，总结了砌体结构房屋震害中的共性问题。对抗震设计理论的发展和性能化设计的应用现状进行了总结，将性能化抗震设计思想引入砌体结构房屋抗震设计之中。 2基于损伤的砌体结构本构关系模型研究基于细观损伤理论和数理统计方法，在应变空间中建立了砌体结构损伤本构模型。分析了损伤变量的演化规律，提出有效损伤发展阶段的概念。将损伤发展和本构研究结合起来，，用细观损伤演化解释了砌体宏观力学行为的变化。该本构模型具有下降段和反弯点。通过试验数据验证，证明了模型的合理性。 3砌体结构抗震性态水准的定量划分根据大量的试验资料和研究成果，对砌体结构房屋在地震作用下的抗震性态水准进行了划分，包括充分运行、运行、基本运行和生命安全四个水准。用反应结构在地震作用下刚度退化和损伤发展的结构整体损伤参数对性态水准进行了定量划分，为砌体结构性能化抗震设计的实际应用创造了条件。 4反映结构刚度退化的损伤指标及损伤谱的建立提出了反映结构刚度退化的损伤指标，该损伤指标通过结构在地震作用前后刚度比确定。提出了损伤谱的概念，即延性需求、能力曲线屈服后刚度比和损伤指标的函数关系。将损伤指标与非线性弹塑性反应分析指标结合了起来，使单自由度体系基于损伤的等效线性化非线性分析得以实现。损伤谱的建立为性态谱建立提供了理论基础。 5基于损伤的砌体结构性能化设计研究基于损伤指标和损伤谱，建立了单自由度体系非线性反应的性态谱。性态谱由损伤指标、单自由度体系自振周期和弹塑性位移增大系数构成，能够综合反映单自由度体系在地震作用下的弹塑性位移增大程度和刚度退化程度，有效地将单自由度体系地震反应分析和结构位移、刚度变化结合起来。基于性态谱，提出了基于损伤的砌体结构性能化设计方法,该方法的基本体系是砌体结构层间剪切模型的等效单自由度体系，通过对该体系振动特性（周期和阻尼）的分析，得到位移反应和损伤指数，结合设定的性能目标，能够对结构进行抗震性能化设计。提出了性态谱建立的流程框图和基于性态谱的性能化设计流程框图，并给出了砌体结构抗震性能化设计的工程实例。
[Abstract]:As a kind of structural form with poor integrity, high stiffness, poor seismic performance and wide application, the renewal and development of seismic design theory is more urgent.In order to adapt to the development of performance-based seismic design theory, it is necessary to strengthen the research of performance-based seismic design method for masonry structures.In this context, the performance-based seismic design of masonry buildings is studied in this paper.The work of this paper is based on the summary of earthquake damage of masonry structures, the study of damage constitutive model of masonry structures, and the emphasis on performance-based seismic design of masonry structures and quantitative division of performance level.The main work of this paper is as follows:Summary of earthquake damage of masonry structure and development of seismic design methodBased on a large number of earthquake damage data, the common problems in earthquake damage of masonry structure buildings are summarized.The development of seismic design theory and the application status of performance-based design are summarized, and the idea of performance-based seismic design is introduced into the seismic design of masonry buildings.Research on constitutive relation model of masonry structure based on damageBased on the mesoscopic damage theory and mathematical statistical method, the damage constitutive model of masonry structure is established in strain space.The evolution law of damage variable is analyzed, and the concept of effective damage development stage is put forward.By combining damage development with constitutive research, the macroscopic mechanical behavior of masonry is explained by mesoscopic damage evolution.The constitutive model has descending section and reverse bending point.The rationality of the model is proved by the test data.Quantitative division of seismic behavior level of masonry structureAccording to a large number of experimental data and research results, the seismic behavior level of masonry structure building under earthquake action is divided into four levels: full operation, operation, basic operation and life safety.In this paper, the overall damage parameters of response structure subjected to seismic action are quantitatively divided, which creates conditions for the practical application of performance-based seismic design of masonry structures.4. Damage index and establishment of damage spectrum reflecting structural stiffness degradationA damage index reflecting the structural stiffness degradation is proposed. The damage index is determined by the stiffness ratio of the structure before and after the earthquake.The concept of damage spectrum is put forward, that is, the function of ductility requirement, stiffness ratio after yield of capability curve and damage index.The damage index is combined with the nonlinear elastic-plastic response analysis index, and the equivalent linearization nonlinear analysis based on damage can be realized for the single-degree-of-freedom system.The establishment of the damage spectrum provides a theoretical basis for the establishment of the property spectrum.Research on performance-based design of masonry structure based on damageBased on damage index and damage spectrum, the nonlinear response spectrum of single degree of freedom system is established.The property spectrum is composed of damage index, natural vibration period of single degree of freedom system and increasing coefficient of elastic-plastic displacement, which can reflect the increasing degree of elastic-plastic displacement and the degree of stiffness degradation of single-degree-of-freedom system under earthquake action.The seismic response analysis of single degree of freedom system is effectively combined with the structural displacement and stiffness changes.Based on the property spectrum, a performance-based design method for masonry structures based on damage is proposed. The basic system of this method is the equivalent single-degree-of-freedom system of the interstory shear model of masonry structures. The vibration characteristics (period and damping) of the system are analyzed.Displacement response and damage index, combined with the performance target, can be used for seismic performance design of structures.In this paper, the flow chart of the establishment of the property spectrum and the flow chart of performance-based design based on the property spectrum are presented, and an engineering example of seismic performance design of masonry structure is given.
【学位授予单位】：郑州大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU364;TU352.11

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