空间钢构架混凝土柱受力性能试验研究
发布时间：2018-09-14 19:32
【摘要】：空间钢构架是由横向(或斜向)缀条与纵向弦杆(角钢)焊接而成的承重轻钢结构,具有一定的刚度和承载能力,将空间钢构架取代传统的钢筋骨架形成空间钢构架混凝土。试验结果表明,空间钢构架对核心混凝土具有一定的约束作用,使约束混凝土的强度和延性得到较大的提高,可以提高结构构件的承载力和变形能力。目前对空间钢构架约束混凝土短柱受力性能的试验研究和理论分析还很少,为了探究空间钢构架混凝土柱的受力性能,本文主要工作如下：以空间钢构架弦杆(角钢)配钢率(弦杆肢长)、横向缀条的间距、横向缀条的宽度、混凝土强度等级等为设计参数,设计制作了18个空间钢构架混凝土短柱试件,进行了空间钢构架混凝土短柱轴心受压性能试验研究。试验结果表明,随着弦杆(角钢)肢长的增大,缀条宽度的增大,缀条间距的减小,设置斜向缀条,混凝土强度等级的提高,空间钢构架对核心混凝土的约束作用增强,短柱试件的峰值荷载及变形能力提高。参照Mander模型中假定的矩形箍筋约束混凝土核心有效约束混凝土区域的确定方法,提出空间钢构架混凝土短柱核心截面的有效约束区域。结合本次空间钢构架混凝土短柱的试验结果和已有试验结果,提出了空间钢构架约束混凝土的峰值应力计算公式,为空间钢构架混凝土短柱轴压承载力计算提供依据。在试验研究和约束机理分析的基础上,提出了两种空间钢构架混凝土短柱轴压承载力计算方法,前者考虑了空间钢构架约束混凝土强度的提高影响,计算公式与现行《混凝土结构设计规范》(GB50010-2010)相衔接,后者同时考虑了空间钢构架约束混凝土强度提高影响和空间钢构架弦杆(角钢)强度降低的影响。两种计算公式的计算值与试验值符合较好。
[Abstract]:Spatial steel frame is a light-bearing steel structure which is welded by transverse (or oblique) bar and longitudinal chord (angle steel). It has a certain stiffness and bearing capacity. The spatial steel frame replaces the traditional steel skeleton to form concrete of spatial steel frame. The test results show that the spatial steel frame can restrain the core concrete to a certain extent, so that the strength and ductility of the confined concrete can be greatly improved, and the bearing capacity and deformation ability of the structural members can be improved. At present, there are few experimental studies and theoretical analysis on the mechanical behavior of space steel frame confined concrete short columns, in order to explore the behavior of spatial steel frame concrete columns, The main work of this paper is as follows: the design parameters are the ratio of steel chord (angle steel) in space steel frame (chord length), the distance between transverse bars, the width of transverse bars, the strength grade of concrete, etc. Eighteen concrete short column specimens of spatial steel frame were designed and manufactured, and the axial compression behavior of space steel frame concrete short columns was studied. The experimental results show that with the increase of the length of the chord (angle steel), the width of the bar, the decrease of the spacing between the bars, the establishment of oblique bars, the improvement of the strength grade of concrete, the restraint effect of the spatial steel frame on the core concrete is enhanced. The peak load and deformation capacity of short column specimen are improved. According to the method of determining the effective confined concrete region of concrete core confined by rectangular stirrups in Mander model, the effective confinement area of the core section of concrete short columns with spatial steel frame is proposed. Based on the experimental results of the spatial steel frame concrete short columns and the existing test results, a formula for calculating the peak stress of the space steel frame confined concrete columns is put forward, which provides the basis for the calculation of the axial compression capacity of the space steel frame concrete short columns. On the basis of experimental study and constraint mechanism analysis, two calculation methods of axial compression capacity of spatial steel frame concrete short columns are put forward. The former takes into account the effect of increasing the strength of confined concrete in space steel frame. The calculation formula is connected with the current Code for Design of concrete structures (GB50010-2010), which takes into account the influence of increasing the strength of confined concrete in space steel frame and decreasing the strength of chord (angle steel) in space steel frame. The calculated values of the two formulas are in good agreement with the experimental values.
【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU398.9
[Abstract]:Spatial steel frame is a light-bearing steel structure which is welded by transverse (or oblique) bar and longitudinal chord (angle steel). It has a certain stiffness and bearing capacity. The spatial steel frame replaces the traditional steel skeleton to form concrete of spatial steel frame. The test results show that the spatial steel frame can restrain the core concrete to a certain extent, so that the strength and ductility of the confined concrete can be greatly improved, and the bearing capacity and deformation ability of the structural members can be improved. At present, there are few experimental studies and theoretical analysis on the mechanical behavior of space steel frame confined concrete short columns, in order to explore the behavior of spatial steel frame concrete columns, The main work of this paper is as follows: the design parameters are the ratio of steel chord (angle steel) in space steel frame (chord length), the distance between transverse bars, the width of transverse bars, the strength grade of concrete, etc. Eighteen concrete short column specimens of spatial steel frame were designed and manufactured, and the axial compression behavior of space steel frame concrete short columns was studied. The experimental results show that with the increase of the length of the chord (angle steel), the width of the bar, the decrease of the spacing between the bars, the establishment of oblique bars, the improvement of the strength grade of concrete, the restraint effect of the spatial steel frame on the core concrete is enhanced. The peak load and deformation capacity of short column specimen are improved. According to the method of determining the effective confined concrete region of concrete core confined by rectangular stirrups in Mander model, the effective confinement area of the core section of concrete short columns with spatial steel frame is proposed. Based on the experimental results of the spatial steel frame concrete short columns and the existing test results, a formula for calculating the peak stress of the space steel frame confined concrete columns is put forward, which provides the basis for the calculation of the axial compression capacity of the space steel frame concrete short columns. On the basis of experimental study and constraint mechanism analysis, two calculation methods of axial compression capacity of spatial steel frame concrete short columns are put forward. The former takes into account the effect of increasing the strength of confined concrete in space steel frame. The calculation formula is connected with the current Code for Design of concrete structures (GB50010-2010), which takes into account the influence of increasing the strength of confined concrete in space steel frame and decreasing the strength of chord (angle steel) in space steel frame. The calculated values of the two formulas are in good agreement with the experimental values.
【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU398.9
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