多层结构底部框架柱斜撑转换研究

发布时间：2018-03-14 09:24

本文选题：钢筋混凝土　切入点：多层结构　出处：《沈阳建筑大学》2015年硕士论文　论文类型：学位论文

【摘要】：结构转换就是通过设置转换层或使用转换构件将上部建筑的水平及竖向荷载传导下来的一种结构形式。现代建筑对于结构转换的应用已经屡见不鲜,使用结构转换的目的一般来说是为了满足建筑使用功能方面的要求,极少数情况是为了建筑实际施工中的现场处理。斜撑转换作为一种新型的结构转换方式在近些年得到大量应用。从受力的角度讲斜撑转换可以被看做是桁架转换的一种特殊形式,也可以被看做是一种特殊的支撑形式。水平荷载作用下斜柱为偏心受压或偏心受拉构件,竖向荷载作用下为轴心受压构件。SATWE软件模型在近些年由基于薄壁柱理论的三维杆系模型改进升级到基于壳元理论的三维组合结构模型,使其计算适用性大大增强,在工程计算领域得到广泛应用。本文的主要研究内容是在SATWE软件的基础上,通过工程实例方案选型阶段的周期、位移和内力对比分析,对人字形斜撑转换和X型斜撑转换进行研究。人字形斜撑转换和梁式转换的周期和位移对比分析表明单斜撑会使结构平面不规则,抗侧力方式发生偏转变化,结构扭转严重；在将斜撑下移至地面以下后,地面上框架结构平面规则,受力明确,两种转换相差无几。X型斜撑转换和搭接柱的内力对比方面搭接柱的剪力值较大,对截面的要求较高,不容易满足要求。腋撑转换和X型斜撑转换的内力对比分析表明腋撑对框架柱的影响很大,造成框架柱受力复杂。地上x型斜撑转换在不同结构形式对比分析中发现异形柱框架-剪力墙的周期、位移和内力并未出现明显异常,异形柱框架的周期方面出现扭转代替平动的变化,位移方面Y方向的位移明显偏小,内力方面弯矩和剪力出现增大现象。结构的抗震设计分为两个内容：抗震验算和抗震措施,他们是相辅相成的关系。抗震措施分为两大类：抗震构造措施和其他抗震措施。“刚性域”是框架柱、斜柱和他们之间的转换梁,通过抗震措施使之作为一个“整体”来参与结构的受力,解决了构件单一分散套用规范标准的问题。梁下部纵筋非100%伸入支座和梁上部纵筋的根数规定,从一定程度上解决了节点核心区的抗剪问题。在确定x型斜撑转换施工方案时应考虑定位、钢筋绑扎、模板的制作和安装、混凝土浇筑、拆模等因素。
[Abstract]:Structural transformation is a structural form in which the horizontal and vertical loads of the upper building are transmitted by means of a transfer floor or by means of a transfer member. The application of modern buildings to structural transformation has become commonplace. The purpose of the structural conversion is generally to meet the functional requirements of the building, As a new type of structural transformation, inclined brace conversion has been widely used in recent years. From the point of view of force, inclined bracing conversion can be regarded as truss conversion. A special form of. It can also be seen as a special form of bracing. The oblique columns are eccentrically compressed or eccentrically stretched members under horizontal loads. In recent years, the software model. SATWE for axially compressed members under vertical load has been improved from a three-dimensional bar system model based on thin-walled column theory to a three-dimensional composite structure model based on shell element theory, which greatly enhances its applicability. It is widely used in the field of engineering calculation. The main research content of this paper is based on the SATWE software, through the comparative analysis of the period, displacement and internal force of project selection stage, The period and displacement of herringbone oblique brace conversion and beam-type skew bracing conversion are studied. The results show that single skew brace can make the plane irregular, the lateral force mode deflected, and the structure torsion is serious. After the inclined brace is moved down to the ground, the plane rule of the frame structure on the ground, the force of the frame structure is clear, the shear force of the lap column is larger and the section requirement is higher than that of the two types of conversion. It is not easy to meet the requirements. The comparative analysis of the internal forces of axillary brace conversion and X-type oblique brace transfer shows that axillary brace has a great influence on frame column. In the comparative analysis of different structural forms, it is found that the period of frame shear wall with special-shaped column, the displacement and internal force are not obviously abnormal. In the periodic aspect of special-shaped column frame, there is a change of torsion instead of horizontal motion, the displacement of Y direction is obviously small, the bending moment and shear force of internal force are increased, and the seismic design of the structure is divided into two parts: seismic checking calculation and seismic measure. They are complementary. Seismic measures are divided into two broad categories: seismic structural measures and other seismic measures. The "rigid zone" is a frame column, an inclined column and a transfer beam between them. Through seismic measures to participate in the force of the structure as a whole, the problem of the single dispersive application standard of the members is solved. The root number of the longitudinal reinforcement in the lower part of the beam is not 100% and the root number of the longitudinal reinforcement in the upper part of the beam is specified. The problem of shear resistance in the core area of joint is solved to a certain extent. In determining the construction scheme of x type inclined bracing, some factors should be considered, such as location, binding of steel bar, making and installation of formwork, pouring of concrete and dismantling of mould, etc.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375

【参考文献】