短肢剪力墙连梁在罕遇地震作用下弹塑性反应分析

【作者】 黄明远；

【导师】 丁建国； 官平利；

【作者基本信息】 南京理工大学 ， 建筑与土木工程， 2008， 硕士

【摘要】 随着人们对房屋使用功能、面积和房间组合等要求的不断提高,苏南地区以及北京、上海、广州等城市目前已经广泛采用短肢剪力墙结构。连梁是短肢剪力墙结构中连接墙肢与墙肢的粱,从大量的试验结果来看,短肢剪力墙结构的连梁是整个结构的薄弱环节。由于短肢剪力墙连梁结构的理论研究还很不成熟,本文根据短脂剪力墙多垂直杆元改进模型及新的连梁模型推导出了T型、L型和一字型短肢剪力墙的空间单元刚度矩阵及连梁的空间单元刚度矩阵,并采用MATLAB语言编制了短肢剪力墙单元体在地震作用下的时程分析反应程序。最后利用ANSYS计算软件对短肢剪力墙结构模型进行非线性有限元分析。本文所得主要结论如下:1.当连梁的高跨比减小时,结构的整体性随之减弱,结构的承载能力降低,但是结构的延性却在增加。增加连梁的截面宽度可以减小结构的最大位移,从而可以帮助提高结构的整体性2.连梁端点处的配筋率越高,整体结构的最大位移将减小,承载能力在增加,而延性在减小。因此可以根据需要,适当的提高连梁端点处的配筋率,以缓解连梁端点过早破坏。3.随着连梁高跨比的增大,开裂荷载,屈服荷载,极限荷载逐渐增大,但当高跨比增大到一定程度,其屈服荷载和极限荷载增大幅度逐渐减小。随着连梁洞口数的减小,开列荷载和屈服荷载在逐渐增加,而且连梁的延性也在逐渐增加,破坏呈现延性破坏。更多还原

【Abstract】 With the improvement for requirements of the using function and area as well as room combination of buildings from people,the structure of a short-leg shear wall is widely used in the Sunan region and Beijing,Shanghai and Guangzhou.The connected-beam is the beam that links one wall limb to another in the structure of a short-leg shear wall.Based on a lot of test results, The connected-beam is an easily destroyed component part in the structure of a short-leg shear wall.Because theortical research on the structure of a short-leg shear wall is not well completed until now, the spacial element stiffness matrixes on both the short-leg shear walls for shapes of T,L and rectangle section and a connected-beam are induced from the improved multi-vertical rods model and a new connected-beam model in the structure of a short-leg shear wall.Program for analysis of time history response on the structure of a short-leg shear wall under the seismic action has been made by using MATLAB language. Analysis of the non- linear finite element for the structural model of a short-leg shear wall is done by using ANSYS software.The main conclusions in this paper are following:1. When the ratio of height to span in a connected-beam decrease,both integration and carrying capacity of the structure become decreasing,but its ductility become increasing.If the width of connected-beam section is increased,the largest displacement of the structure is decreased ,and its integration is also increased.2. When the ratio of reinforcing bar at the end of a connected beam increase,both the largest displacement and ductility of the structure become decreasing,but its carrying capacity become increasing.If the ratio of reinforcing bar at the end of a connected beam is properly increased from the requirements,the early destructions at the end of a connected beam will be improved.3. The fracture-load and yield-load as well as limit-load will gradually increase with the increase of the ratio of height to span in a connected-beam. After the ratio is increased into a limited one,their increasing extent will become decreasing. The fracture-load and yield-load as well as ductility on a connected beam will increase with the decrease of the number of holes on a connected beam in the structure of a short-leg shear wall,and the ductile destruction of the structure happens.更多还原