高层斜交网格结构竖向荷载作用下外筒结构侧移规律研究
发布时间：2019-05-18 11:57
【摘要】：1960年,匹兹堡大厦的建成拉开了高层斜交网格结构研究的序幕。到21世纪初,对高层斜交网格结构的研究也越来越多,相关的研究成果正不断地以文献或工程实例的形式展现出来。高层斜交网格结构作为建筑领域的新姿态,它造型多样,美观大气,将其研究做深做全做细,有利于我国经济的发展,也将推动学术界的创新。通过有限元分析软件SAP2000建立了不含楼板、核心内筒和连系梁的高层斜交网格外框筒结构模型、只设核心筒的高层斜交网格结构模型及在核心筒基础上加设楼板的高层斜交网格结构模型,对上述三个不同结构形式的高层斜交网格结构模型施加竖向荷载。在弹性范围内,分析外筒结构整体变形曲线得到了竖向荷载作用下,高层斜交网格结构独特的外鼓特征,即侧移规律。分析该规律产生的原因,同时建议采用侧移较小的结构形式,符合现有工程实例普遍应用的结构形式。又改变荷载值的大小,总结了高层斜交网格结构的变形随荷载值变化的变化规律,同时指出构件内力特点。通过斜柱受力后的几何变形图,得出斜柱变形与结构侧向位移的关系,推导出计算高层斜交网格结构竖向荷载作用下最大侧向位移的理论公式。与有限元分析结果对比得出,该公式的计算结果具有一定的参考价值,可以用来初步估算高层斜交网格结构竖向荷载作用下的侧移值。定义斜柱与水平方向的夹角为斜交角度,通过对斜交角度为37.56°、45.71°、56.96°、66.56°、71.99°以及77.77°的六个高层斜交网格结构模型施加竖向荷载,研究斜交角度在高层斜交网格结构侧移规律中所起的重要作用。通过对比六个不同斜交角度的高层斜交网格结构模型侧移曲线,结合第二章得出的侧移规律,发现斜交角度小于50°的两个结构模型侧移曲线变异,不符合规范规定,将其舍弃并对剩下的结构模型继续研究其外鼓侧移的影响因素。最后分别以斜交角度为56.96°、66.56°、71.99°以及77.77°的四个高层斜交网格结构模型为研究对象,研究加强节点、增加斜柱截面面积和增加环梁截面面积对高层斜交网格结构竖向荷载作用下侧移值的影响。得出三种措施较实用的为加强节点和增加环梁截面面积,增加斜柱截面面积的做法意义不大。在斜交角度较小时,加强节点同时加强节点附近部分环梁,是充分提高高层斜交网格结构的受竖向力性能的一个经济的措施。
[Abstract]:In 1960, the construction of Pittsburgh Building opened the prelude to the study of high-rise skew grid structure. At the beginning of the 21st century, there are more and more studies on the high-rise skew grid structure, and the related research results are constantly presented in the form of literature or engineering examples. As a new attitude in the field of architecture, the high-rise skew grid structure has a variety of shapes and beautiful atmosphere. It is beneficial to the economic development of our country and will also promote the innovation of academic circles. The special frame-tube structure model of high-rise skew network without floor, core inner tube and connecting beam is established by finite element analysis software SAP2000. Only the high-rise skew grid structure model of the core tube and the high-rise skew grid structure model with the floor added to the core tube are set up to apply vertical loads to the above three different structural forms of the high-rise skew grid structure model. In the elastic range, the unique outer drum characteristics, that is, the lateral displacement law, of the high-rise skew grid structure under vertical load are obtained by analyzing the overall deformation curve of the outer tube structure. The causes of this law are analyzed, and it is suggested that the structural form with small lateral displacement should be adopted, which is in line with the commonly used structural form of existing engineering examples. The variation law of the deformation of the high-rise skew grid structure with the load value is summarized by changing the load value, and the internal force characteristics of the component are pointed out at the same time. Based on the geometric deformation diagram of oblique column, the relationship between the deformation of inclined column and the lateral displacement of the structure is obtained, and the theoretical formula for calculating the maximum lateral displacement of high-rise skew grid structure under vertical load is derived. Compared with the results of finite element analysis, the calculated results of the formula have certain reference value and can be used to estimate the lateral displacement of high-rise skew grid structures under vertical load. The angle between the oblique column and the horizontal direction is defined as the oblique angle, and the vertical load is applied to six high-rise skew grid structure models with oblique angles of 37.56 掳, 45.71 掳, 56.96 掳, 66.56 掳, 71.99 掳and 77.77 掳. The important role of skew angle in the lateral displacement of high-rise skew grid structures is studied. By comparing the lateral displacement curves of six high-rise skew grid models with different skew angles, combined with the lateral displacement law obtained in the second chapter, it is found that the variation of the lateral displacement curves of the two structural models with oblique angles less than 50 掳is not in accordance with the code. The factors affecting the lateral displacement of the outer drum were studied by abandoning it and continuing to study the remaining structural models. Finally, four high-rise skew grid structure models with oblique angles of 56.96 掳, 66.56 掳, 71.99 掳and 77.77 掳are taken as the research objects to study the strengthened nodes. The influence of increasing the section area of oblique column and ring beam on the lateral displacement of high-rise skew grid structure under vertical load. It is concluded that it is of little significance to strengthen the joint and increase the cross section area of the ring beam and increase the section area of the inclined column in order to strengthen the joint and increase the cross section area of the ring beam. When the skew angle is small, strengthening the joint and strengthening some ring beams near the joint is an economic measure to fully improve the vertical force performance of the high-rise skew grid structure.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973
[Abstract]:In 1960, the construction of Pittsburgh Building opened the prelude to the study of high-rise skew grid structure. At the beginning of the 21st century, there are more and more studies on the high-rise skew grid structure, and the related research results are constantly presented in the form of literature or engineering examples. As a new attitude in the field of architecture, the high-rise skew grid structure has a variety of shapes and beautiful atmosphere. It is beneficial to the economic development of our country and will also promote the innovation of academic circles. The special frame-tube structure model of high-rise skew network without floor, core inner tube and connecting beam is established by finite element analysis software SAP2000. Only the high-rise skew grid structure model of the core tube and the high-rise skew grid structure model with the floor added to the core tube are set up to apply vertical loads to the above three different structural forms of the high-rise skew grid structure model. In the elastic range, the unique outer drum characteristics, that is, the lateral displacement law, of the high-rise skew grid structure under vertical load are obtained by analyzing the overall deformation curve of the outer tube structure. The causes of this law are analyzed, and it is suggested that the structural form with small lateral displacement should be adopted, which is in line with the commonly used structural form of existing engineering examples. The variation law of the deformation of the high-rise skew grid structure with the load value is summarized by changing the load value, and the internal force characteristics of the component are pointed out at the same time. Based on the geometric deformation diagram of oblique column, the relationship between the deformation of inclined column and the lateral displacement of the structure is obtained, and the theoretical formula for calculating the maximum lateral displacement of high-rise skew grid structure under vertical load is derived. Compared with the results of finite element analysis, the calculated results of the formula have certain reference value and can be used to estimate the lateral displacement of high-rise skew grid structures under vertical load. The angle between the oblique column and the horizontal direction is defined as the oblique angle, and the vertical load is applied to six high-rise skew grid structure models with oblique angles of 37.56 掳, 45.71 掳, 56.96 掳, 66.56 掳, 71.99 掳and 77.77 掳. The important role of skew angle in the lateral displacement of high-rise skew grid structures is studied. By comparing the lateral displacement curves of six high-rise skew grid models with different skew angles, combined with the lateral displacement law obtained in the second chapter, it is found that the variation of the lateral displacement curves of the two structural models with oblique angles less than 50 掳is not in accordance with the code. The factors affecting the lateral displacement of the outer drum were studied by abandoning it and continuing to study the remaining structural models. Finally, four high-rise skew grid structure models with oblique angles of 56.96 掳, 66.56 掳, 71.99 掳and 77.77 掳are taken as the research objects to study the strengthened nodes. The influence of increasing the section area of oblique column and ring beam on the lateral displacement of high-rise skew grid structure under vertical load. It is concluded that it is of little significance to strengthen the joint and increase the cross section area of the ring beam and increase the section area of the inclined column in order to strengthen the joint and increase the cross section area of the ring beam. When the skew angle is small, strengthening the joint and strengthening some ring beams near the joint is an economic measure to fully improve the vertical force performance of the high-rise skew grid structure.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973
【参考文献】
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