【作者】 魏晓；

【导师】 姚谦峰； 张茂功；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2008， 博士

【摘要】 框支密肋复合墙结构是底部采用大空间框架-抗震墙(或复合墙)结构、上部采用密肋复合墙结构的一种新型抗震结构体系。由于密肋复合墙结构自重轻，整体性好，具有较高的承载及耗能能力，且其承载力和刚度可根据不同设计要求进行调整，因此框支密肋复合墙结构易于实现底部大空间与上部房屋结构的竖向刚度协调，提高结构的整体抗震能力。墙梁作为上下结构间最重要的转换构件，其性能对结构整体抗震能力的优劣起到了决定性的作用，研究其受力机理、抗震设计理论就显得尤为重要。本文通过试验研究、理论分析及数值模拟，对墙梁在竖向荷载及与水平荷载共同作用下的受力性能及影响因素进行了研究，建立了框支密肋复合墙结构的简化力学模型，提出了墙梁的实用设计计算方法；并就结构层间刚度比的合理取值进行了探讨，给出了框支密肋复合墙结构抗震构造措施。本文的主要研究内容包括：1框支密肋复合墙结构墙梁抗震性能试验研究及竖向荷载作用下的受力机理分析(创新点一)为考察框支密肋复合墙结构墙梁在竖向及水平低周反复荷载作用下的反应，通过对四榀两跨框支密肋复合墙结构墙梁的试验研究，就墙梁的受力机理、破坏模式及抗震性能进行了分析。重点研究了复合墙结构墙梁在竖向荷载作用下的受力性能并就其影响因素进行了分析。2框支密肋复合墙结构墙梁非线性有限元分析为弥补实体试验中试件数量、工况及加载条件的局限性，更加全面地反应框支密肋复合墙结构墙梁的受力性能，通过框支密肋复合墙结构墙梁的非线性有限元分析，较为真实地模拟了墙梁的内力、变形、裂缝发展的全过程及极限承载力水平；同时，针对试验研究的局限性，利用通过验证的有限元分析模型，提供了墙梁更多的反应信息，从而为建立更为有效的墙梁计算模型奠定了基础。3框支密肋复合墙结构墙梁折算荷载及实用设计方法研究(创新点二)为将结构上部荷载折算为墙梁计算荷载，简化框支结构墙梁的设计计算方法，结合试验数据，利用验证后的有限元数值模型对框支密肋复合墙结构墙梁在竖向荷载作用下的受力特点进行了计算分析，并就影响复合墙中托梁应力分布的四个主要因素：托梁最大内力与墙体高跨比H_w／L、托梁高跨比H_b/L、墙体弹性模量与托梁弹性模量比E／E_c、开洞及其位置等进行了较为详细的对比分析；以弹性地基梁理论为基础，提出托梁在竖向荷载作用下的三角级数应力分布形式，并回归托梁的荷载折减系数，给出了较为实用、简便的墙梁设计计算方法，为框支密肋复合墙结构墙梁的实用设计提供了科学依据。4框支密肋复合墙结构层间刚度比的优化设计研究(创新点三)为解决框支结构转换层上、下层间刚度比合理取值问题，在本文前述试验研究及非线性有限元分析的基础上，结合课题组前期研究成果及现代高层结构计算理论，建立了框支密肋复合墙结构弹性阶段的简化力学模型——框支—复合弹性板模型；利用验证后的简化力学模型对结构进行了动力反应分析，探讨了转换层上、下层间刚度比对框支密肋复合墙结构弹性侧移的影响，并提出其合理取值，初步解决了框支复合墙结构层间刚度比的优化设计难题。5框支密肋复合墙结构抗震设计方法研究通过对比分析几种常见墙梁的设计计算方法，给出了框支密肋复合墙结构墙梁的实用设计计算公式；建立了框支密肋复合墙结构弹性及弹塑性计算模型；运用抗震控制设计思想，给出框支密肋复合墙结构及构件的抗震构造措施。更多还原

【Abstract】 Frame-Supported Multi-Ribbed Composite Wall Structure is a new anti-seismic structure system with large space Frame-anti-seismic Wall (Composite Wall) Structure at the bottom and Multi-Ribbed Composite Wall Structure at the top. The Multi-Ribbed Composite Wall Structure has such advantages as light weight, good integrality and high bearing and dissipated capacity, and the bearing capacity and stiffness of the structure can be adjusted according to different design requirements, therefore, it is easy to make the vertical rigidity between the bottom large space and the upper structure harmony, which improves the seismic performance of the whole structure. As the most important transfer member between the upper and the bottom structure, the wall beam plays a decisive role in the seismic performance of the whole structure. So, the research on the stress mechanism and anti-seismic design theory of the wall beam is especially important.In the paper, the experimental researches, theoretical analysis and numerical simulation are used to studies the load-bearing performance and influence factors of the wall beam under the vertical and horizontal loads. The simplified mechanical model of Frame-Supported Multi-Ribbed Wall Structure is established and the practical design calculated methods for wall beam are proposed. Meanwhile, the reasonable stiffness ratio between structural interlayer has been discussed and some details of seismic design for Frame-Supported Multi-Ribbed Composite Wall Structure are provided. The main contents are presented as follows:1. Aseismatic capability Experimental study of Frame-Supported Multi-Ribbed Wall Beam and the bearing capacity of the wall beam under vertical load (Innovation No:1)To study the the reaction of Frame-Supported Multi-Ribbed Composite Wall Beams under vertical and horizontal low-cyclic loading , Through the experimental study on four pin and two-scale models, the force mechanism , failure modes and the seismic performances of the wall beam are studied, in which the bearing capacity and the influence factors of the wall beam under vertical load are mainly discussed.2. Nonlinear Finite Element Analysis for the Frame-Supported Multi-Ribbed Wall BeamIn order to solve the entity experiment limitions of examination quantity,condition of work and load ,reveal the Frame-Supported Multi-Ribbed Wall Beam’s mechanics behavior, Based on the nonlinear FEM analysis on the Frame-Supported Multi-Ribbed Wall Beam, the whole process of the internal force , deformation, cracks-development and the ultimate bearing capacity of the wall beam are well simulated. Meanwhile, the verified finite element analysis models are used to obtain more reaction information of the wall bean, which lays a foundation for establishing a more effective calculation model of the wall beam.3. Study on load Reduction of Frame-Supported Multi-Ribbed Wall Beam and practicality design method (Innovation No: 2)In order to simplify the Frame-Supported Multi-Ribbed Wall Beam’s design and calculation method by means of convert the upper loads to wall beams’s calculation loads, According to the experimental results, the verified finite element model is used to analysis of the bearing characteristic of frame-supported multi-ribbed wall beam under the vertical load. Meanwhile, the comparison and analysis of the four mainly factors which influence the stress distribution of trimmer beam of composite wall is carried out in this paper, such as the ultimate load of the trimmer beam and the height-to-span ratio of the wall、the height-to-span ratio of the trimmer beam、the ration of elastic modulus of the wall and the trimmer beam、opening holes and position and so on. Based on the theory of elastic foundation beam, the triangle series stress distribution of the trimmer beam under vertical load is established. At the same time, the load reduction coefficient of trimmer beam is taken back , and a more practical, simple and convenient calculation and design method is carried out, which provides a scientific basis for the practicality design of the Frame-Supported Multi-Ribbed Composite Wall Structure beam.4 Study on Optimization design of Rigidity Ratio between Stories of Frame-Supported Multi-Ribbed Wall Structure(Innovation No: 3)In order to solve the problem of The reasonable value of Rigidity Ratio between Stories of Frame-Supported Multi-Ribbed Wall Structure, Based on above Experimental study in this paper, Nonlinear Finite Element Analysis,previous research results and the calculation theory of modern high-rise structures, the frame-supported composite elastic slab model as the simplified mechanical model of Frame-Supported Multi-Ribbed Wall Structure in elastic stage is carried out in this paper. Then the verified simplify mechanical model is used to analyze the dynamic response of the structure, and the effect of the rigidity ratio of the upper story and lower story of the transfer story to the structure elastic displacement is discussed. Moreover, the reasonable value is put forward, which preliminary solve the Optimization design difficulty of Rigidity Ratio between Stories of Frame-Supported Multi-Ribbed Wall Structure.5. Seismic Design Method of the Frame-supported Multi-ribbed Frame Wall StructureBased on the comparison of the design methods of several common wall beams, the empirical computing formula of the Frame-Supported Multi-Ribbed Wall Beam is established. In addition, the elastic and elastic-plastic calculation model for the Frame-Supported Multi-Ribbed Wall Structure is put forward. Finally, based on the idea of seismic control, some seismic detail measures of Frame-supported Multi-ribbed Frame Wall Structure and its members are provided.更多还原