基于倾覆力矩的高层建筑结构整体失效分析

发布时间：2018-07-28 16:45

【摘要】：随着高层建筑结构高度及高宽比的增大，由重力二阶效应产生的结构附加弯矩逐渐成为了影响结构整体稳定的重要因素，而由此产生的倾覆力矩非线性增大是导致结构整体失稳倒塌的关键。目前已有研究主要是基于结构弹性变形分析结构的整体稳定，而少有关注结构进入塑性阶段后基于倾覆力矩的结构整体稳定分析。为此，本文将结构整体失效过程中倾覆力矩作为重要判据，分析结构失效过程中影响倾覆力矩的结构状态参数，确定该参数与倾覆力矩之间的量化关系，给出基于结构倾覆力矩的整体失效判别指标及量化评价方法。弹性阶段结构倾覆力矩的推导。通过线性叠加的方法，推导了高层建筑结构在弹性阶段各楼层和基底倾覆力矩的计算公式，明确了倾覆力矩与结构刚重比之间的关系。塑性阶段结构倾覆力矩的推导。阐述了结构瞬时等效抗侧刚度的求解方法。通过增量叠加的方法，推导了高层建筑结构进入塑性阶段后各楼层及基底倾覆力矩的计算公式。结构不同失效阶段倾覆力矩的数值验证。通过设计不同结构参数的框架-核心筒结构和斜交网格筒结构有限元模型，进行了结构失效过程的数值分析，得到了结构倾覆力矩在不同失效阶段沿高度的变化规律，验证了基底倾覆力矩在研究结构整体失效分析中的合理性，在此基础上描述了基底倾覆力矩塑性阶段的发展过程。基于基底倾覆力矩的失效判别方法。结合以上分析结果，建立了塑性阶段结构倾覆力矩的求解方法，并明确了塑性阶段结构瞬时基底剪力与结构最大层间位移角的量化关系，推导了基底倾覆力矩在不同失效阶段的量化公式，，在此基础上提出了基于基底倾覆力矩的失效判别方法，并验证了该失效判别指标的正确性。
[Abstract]:With the increase of height and aspect ratio of tall buildings, the additional bending moment produced by the second-order gravity effect has gradually become an important factor affecting the overall stability of the structure. The nonlinear increase of the overturning moment is the key to the instability and collapse of the whole structure. At present, the research is mainly based on the structural elastic deformation analysis of the overall stability of the structure, but little attention has been paid to the overall stability analysis of the structure based on the overturning moment when the structure enters the plastic stage. Therefore, in this paper, the overturning moment in the course of structural failure is taken as an important criterion, and the structural state parameters which affect the overturning moment in the course of structural failure are analyzed, and the quantitative relationship between the parameters and the overturning moment is determined. Based on the structural overturning moment, the overall failure discriminant index and the quantitative evaluation method are presented. Derivation of overturning moment of structure in elastic stage. By the method of linear superposition, the formulas for calculating the overturning moment of each floor and base in the elastic stage of high-rise building are derived, and the relationship between the overturning moment and the rigid-weight ratio of the structure is clarified. Derivation of overturning moment in plastic stage. The method of solving the instantaneous equivalent lateral stiffness of the structure is presented. By the method of incremental superposition, the formulas for calculating the overturning moment of each floor and base after the high-rise building structure enters the plastic stage are derived. Numerical verification of overturning moment at different failure stages. By designing the finite element models of frame-core tube structure and oblique grid tube structure with different structural parameters, the structural failure process is numerically analyzed, and the variation law of the overturning moment along the height in different failure stages is obtained. The rationality of the base overturning moment in the structural failure analysis is verified, and the development process of the plastic stage of the base overturning moment is described. A method for identifying failure based on the overturning moment of the base is presented. Based on the above analysis results, a method for calculating the overturning moment of the structure in plastic stage is established, and the quantitative relationship between the instantaneous base shear force and the maximum interstory displacement angle of the structure in the plastic stage is clarified. The quantitative formulas of the subbase overturning torque at different failure stages are derived. Based on this, the method of judging the subbase overturning moment is proposed, and the validity of the failure discriminant index is verified.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU973.2

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