高层结构基于整体及构件损伤指标的地震失效评价方法

发布时间：2018-04-27 13:10

本文选题：高层建筑结构 + 整体稳定失效　；参考：《哈尔滨工业大学》2014年博士论文

【摘要】：高层结构大震失效的损伤演化量化描述是实现基于性能抗震设计方法的关键。为描述高层建筑结构的地震失效机理，本文从结构大震下整体稳定失效过程及构件损伤发展累积两个角度出发，研究高层建筑结构大震失效演化过程及损伤状态的量化，实现了从结构整体稳定失效判别指标、基于材料损伤的构件损伤到结构整体损伤的失效演化过程量化评价，具体的研究工作如下：（1）高层建筑结构整体稳定分析。通过连续化方法的体系变形分析，建立了高层建筑结构的初始等效抗侧刚度求解方法，明确了结构变形的分布形态，在此基础上研究了结构的重力二阶效应及其与结构刚重比的关系，并给出了结构体系整体稳定的限定条件。（2）基于整体稳定的失效判别方法研究。通过整体稳定平衡分析提出了瞬时等效刚重比的概念，揭示了瞬时等效刚重比与结构非线性响应之间的关系，给出了基于瞬时等效刚重比变化的结构整体失效判别方法，得到了失效判别指标与结构失效状态的量化关系，，并通过模型试验，验证了该失效判别方法的正确性。（3）基于材料损伤的剪力墙墙肢构件失效研究。通过不同设计参数的钢筋混凝土剪力墙低周往复试验结果分析及失效演化过程的有限元模拟分析，得到了影响钢筋混凝土剪力墙材料损伤演化特点的高宽比和轴压比等主要参数。基于构件的材料损伤发展特点给出了钢筋混凝土剪力墙弯曲型失效和剪切型失效两种失效模式分类。通过材料损伤信息与构件性能阶段性变化的关系，以材料竖向损伤发展信息为主，对损伤信息进行提取分类得到能够合理表征剪力墙构件损伤演化特点的损伤指标；针对不同失效模式给出了量化墙肢失效演化过程中各损伤状态的损伤指标值的确定方法。（4）基于材料损伤的连梁构件失效研究。明确了影响钢筋混凝土连梁材料损伤发展演化特点的主要影响因素为剪跨比、广义剪压比及剪箍比。基于连梁水平向材料损伤发展规律给出了弯曲型失效、剪切型失效和弯剪型失效三种失效模式的分类。通过材料损伤发展特点的研究，将能够合理反映连梁性能变化及损伤特点的损伤信息转化成构件损伤指标。针对不同失效模式给出了定量描述连梁失效演化过程中各损伤状态的损伤指标值确定方法。（5）基于材料损伤的钢筋混凝土梁柱构件失效研究。通过不同设计参数对钢筋混凝土材料损伤发展演化特点的影响分析，明确了失效模式关键影响因素。基于材料损伤发展特点给出了钢筋混凝土梁柱失效模式的分类。通过材料损伤发展与构件性能阶段性变化的关系划分构件性能阶段，以沿轴向发展的损伤为主，分别选取了不同区域的材料平均受压损伤为损伤指标，表征梁柱不同的失效模式，针对不同失效模式明确了各阶段临界状态的损伤指标值，并给出了定量描述构件失效演化过程中各损伤状态的损伤指标值确定方法。（6）高层建筑结构基于构件损伤的整体失效研究。基于构件失效演化过程的损伤模型，以构件类型、构件损伤程度及位置的重要性为依据定义了构件损伤到结构损伤信息传递系数，实现了由材料损伤累积发展到结构整体损伤的结构大震失效演化全过程量化描述，并将该方法应用到实际工程中。
[Abstract]:In order to describe the seismic failure mechanism of high building structure, this paper studies the failure evolution process and loss of the high rise building structure from two angles of the overall stability failure process and the cumulative damage development of the component. The quantitative evaluation of the damage state has realized the quantitative evaluation of the failure evolution process based on the damage of the material to the overall damage of the structure, and the specific research work is as follows:
(1) the overall stability analysis of the high-rise building structure. Through the analysis of the system deformation of the continuous method, the initial equivalent anti lateral stiffness solution method of the high-rise building structure is established, and the distribution pattern of the structural deformation is clarified. On this basis, the gravity two order effect of the structure and its relation to the structural stiffness ratio are studied, and the structure system is given. The restrictive condition of body stability.
(2) the failure discrimination method based on the whole stability is studied. The concept of instantaneous equivalent rigid weight ratio is proposed through the integral stability equilibrium analysis. The relationship between the instantaneous equivalent rigid weight ratio and the nonlinear response of the structure is revealed. The failure discrimination method based on the change of the instantaneous equivalent rigid weight ratio is given, and the failure criterion and the conclusion are obtained. The quantitative relationship between the failure state and the correctness of the failure identification method is verified by model tests.
(3) failure study of shear wall limb component based on material damage. Through the analysis of low cycle reciprocating test results of reinforced concrete shear walls with different design parameters and the finite element simulation analysis of failure evolution process, the main parameters such as height width ratio and axial pressure ratio affecting the damage evolution characteristics of reinforced concrete shear walls are obtained. Two types of failure mode classification of flexural failure and shear failure of reinforced concrete shear wall are given. Through the relationship between the damage information of the reinforced concrete shear wall and the phase change of the component performance, the information of the material vertical damage development is mainly based on the information of the material vertical damage development, and the shear wall components can be reasonably characterized by the classification of the damage information. The damage index of the damage evolution characteristics and the method for determining the damage index value of each damage state during the failure evolution process of the wall limb are given in the light of different failure modes.
(4) the main influence factors of the damage development and evolution of reinforced concrete beams are the shear span ratio, the generalized shear pressure ratio and the shear hoop ratio, which are based on the damage development of the reinforced concrete beams. The flexural failure, the shear failure and the bending shear failure mode are given three failure modes based on the horizontal beam horizontal material damage development law. Through the study of the characteristics of material damage development, the damage information which can reasonably reflect the damage characteristics of the continuous beam is transformed into the damage index of the component. In this paper, a quantitative method for determining the damage index value of each damage state in the process of failure evolution of continuous beams is given in the light of different failure modes.
(5) failure study of reinforced concrete beams and columns based on material damage. Through the analysis of the influence of different design parameters on the damage and evolution of reinforced concrete material, the key factors of failure mode are clarified. Based on the characteristics of material damage development, the classification of failure modes of reinforced concrete beams and columns is given. The damage development of the reinforced concrete beams and columns is given. The relationship between the component performance phase change and the component performance phase is divided into the component performance phase, which is mainly caused by the damage along the axial direction. The average compression damage of different regions is selected as the damage index, the different failure modes of the beam and column are characterized, and the damage index values of the adjacent state in different stages are clearly defined, and the quantitative description is given. A method for determining the damage index values of each damage state in the process of component failure evolution.
(6) the structure of the high-rise building is based on the whole failure study of structural damage. Based on the damage model of component failure evolution process, the information transfer coefficient of structural damage to structural damage is defined on the basis of the component type, the damage degree and the importance of the position of the component, and the structural large earthquake from the cumulative damage of the material to the overall damage of the structure is realized. The whole process of failure evolution is described quantitatively, and the method is applied to practical engineering.

【学位授予单位】：哈尔滨工业大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU973.31

【参考文献】