【作者】 丁永刚；

【导师】 姚谦峰；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2006， 博士

【摘要】 密肋壁板结构是一种节能、抗震的建筑结构新体系。目前,对其在常规多层及高层房屋建筑中的理论与应用研究已取得较好的阶段性成果,但对该结构体系在底部大空间房屋建筑中的研究尚处于空白。本文针对底部大空间框支密肋壁板结构中最重要的承力构件——框支密肋壁板结构墙梁为研究对象,以其受力性能及设计计算方法研究为主线,就其受力机理、抗震性能及实用设计计算方法等进行了较为详细的研究,主要研究内容如下: 1.进行了四榀大比例两跨框支密肋壁板结构墙梁模型的伪静力试验,研究了框支密肋壁板结构墙梁在竖向荷载作用下的受力性能和组合作用,以及在竖向和水平荷载共同作用下的破坏过程及其破坏形态、承载能力、变形性能、滞回延性、抗倒塌能力等抗震性能,探讨了墙梁跨长比、托梁高跨比及墙体开洞等因素对框支密肋壁板结构墙梁受力性能的影响,并在破坏形态、承载力、变形、耗能诸方面与框支砌体结构墙梁及框支剪力墙进行了对比分析。 2.采用实体单元模拟混凝土及砌块、杆单元模拟钢筋,运用等向强化模型与William—Warnke五参数破坏准则建立了框支密肋壁板结构墙梁的非线性有限元分析模型,利用试验数据验证了模型的合理性。通过竖向荷载作用下的非线性有限元分析,较为真实地模拟了框支密肋壁板结构墙梁的应力分布,以及墙梁跨长比、托梁高跨比、墙体开洞等因素对其应力分布的影响,得到了竖向荷载在墙梁复合墙体中分配的比例关系。 3.通过竖向与水平荷载共同作用下的非线性有限元分析,较为真实、简化地模拟了框支密肋壁板结构墙梁内力和变形发展的全过程,描述了其裂缝的形成和扩展以及破坏过程和极限承载力水平。 4.在试验研究及有限元分析的基础上,研究了框支密肋壁板结构墙梁的受力机理,并与框支砌体结构墙梁进行了对比分析,提出了框支密肋壁板结构墙梁的理论计算模型。 5.考虑墙梁跨长比、托梁高跨比、墙体高跨比、底部框架柱的截面高度与其长度之比等因素,采用正交试验设计,通过对计算结果的直观分析和方差分析,对框支密肋壁板结构墙梁中托梁内力的影响因素进行了显著性分析,在此基础上考察开洞位置对托梁内力的影响,通过更多还原

【Abstract】 Multi-ribbed slab structure (MRSS) is a new structural system, characterized by saving energy and good seismic performance. At the present time, certain staged achievements have been made in the study of the theoretical and application of conventional multi-storied and high-rise buildings, but the study of this system in buildings with large space at the bottom remains blank. The dissertation is devoted to frame-supported multi-ribbed wall beam (FSMRWB), the main bearing member in the frame-supported multi-ribbed slab structure with large space at the bottom, and mainly studies its load-bearing performance and design method, including its load-bearing mechanism, seismic performance and practical design method. The main studied are as follows.1. The pseudo-static experiments of four large-scale models of FSMRWB are done. The load-bearing performance and composite action of FSMRWB under vertical load are explored, then the failure procedure and the seismic performances under both vertical and horizontal load, such as failure mode, bearing capacity, deformation features, hysteretic characteristic and anti-collapse performance, are studied. Then the influence of the factors, such as is discussed, and FSMRWB is contrasted with frame-supported masonry wall beam and frame-supported shear wall in failure mode, bearing capacity, deformation and energy dissipation.2. Through simulating concrete and blocks with solid element, bars with link element, and using isotropic hardening model and William-Warnke five-parameter failure rule, the nonlinear FEM analysis model of FSMRWB is set up, whose rationality is certificated by experimental data. Through the nonlinear FEM analysis under vertical load, the stress distribution and the influence of span-to-span ratio of the wall beam, height-to-span ratio of the trimmer beam, and the opening in the wall, are simulated. And the distribution proportion of vertical load in different members of the multi-ribbedcomposite wall is obtained.3. Through the nonlinear FEM analysis under vertical and horizontal load, the whole changing process of the internal force and deformation of FSMRWB is simulated truly and simply, and the appearance and development of cracks, the failure procedure and the ultimate strength capacity is described.4. On the basis of experimental study and finite element analysis, the load-bearing mechanism of FSMRWB is studied, and it is contrasted with that of frame-supported masonry wall beam. Then, the theoretical calculation model of FSMRWB is put forward.5. Considering the factors of span-to-span ratio of the wall beam, height-to-span ratio of the trimmer beam, height-to-span ratio of the wall and section height-to-length ratio of the bottom frame column, the orthogonal design is done and the internal force of the trimmer beam is calculated. Through the visual analysis and variance analysis to the results, the significance analysis of the factors influencing the internal force of the trimmer beam of FSMRWB is done. Then, considering the position of the opening in the wall, the internal force coefficient of the trimmer beam is obtained through regression analysis. In addition, the simple drawing for the design and calculation of FSMRWB is put forward, and the practical design calculation formula of the trimmer beam of FSMRWB is also given.6. By referring to the practical formula for oblique section bearing capacity of ordinary multi-ribbed composite wall, and considering the results of the experimental study and theoretical analysis, the practical formula for oblique section bearing capacity of the walls in FSMRWB is given.7. According to the results of the experimental study and theoretical analysis, the possible failure modes of FSMRWB under earthquake are pointed out. With seismic control design method, the seismic detail measures for FSMRWB are proposed. Considering the load-bearing performance of high-rise multi-ribbed slab structures, some problems on the transfer beam in high-rise frame-supported multi-ribbed slab structures are discussed.The originality of this dissertation lies in: 1. Large-scale FSMRWB model experimentsLarge-scale FSMRWB model experiments are done for the first time. Through the experiments, the load-bearing performance of FSMRWB under vertical load and the seismic performances under both vertical and horizontal load, such as failure mode, bearing capacity, deformation, hysteretic characteristic and anti-collapse performance, are studied systematically, which assures the usage of MRSS in buildings with large space at the bottom.2. Establishment of nonlinear numerical model of FSMRWBNonlinear finite element model of FSMRWB is established for the first time. Through the nonlinearFEM analysis, the stress distribution and load-bearing performance of FSMRWB are truly simulated, which provides more detailed data for the comprehension of load-bearing mechanism of FSMRWB.3. Provision of the theoretical calculation model of FSMRWBConsidering the unique structural details of MRSS, the results of the experimental study and theoretical analysis, the load-bearing mechanism of FSMRWB is studied, and the theoretical calculation model of FSMRWB is put forward.4. Establishment of the practical design calculation formula of the trimmer beam of FSMRWB Through the orthotropic experiment design, the significance analysis of the factors infiuencing theinternal force of Ihe trimmer beam of FSMRWB is done for the first time, and the practical design calculation formula of the trimmer beam of FSMRWB is set up through regression analysis.5. Provision of the seismic detail measures of FSMRWBConsidering the load-bearing performance of FSMRWB, and its possible failure mode under earthquake, the seismic detail measures of FSMRWB are provided with seismic control design method.更多还原