空間鋼構(gòu)架混凝土柱受力性能試驗研究
發(fā)布時間：2018-09-14 19:32
【摘要】：空間鋼構(gòu)架是由橫向(或斜向)綴條與縱向弦桿(角鋼)焊接而成的承重輕鋼結(jié)構(gòu),具有一定的剛度和承載能力,將空間鋼構(gòu)架取代傳統(tǒng)的鋼筋骨架形成空間鋼構(gòu)架混凝土。試驗結(jié)果表明,空間鋼構(gòu)架對核心混凝土具有一定的約束作用,使約束混凝土的強度和延性得到較大的提高,可以提高結(jié)構(gòu)構(gòu)件的承載力和變形能力。目前對空間鋼構(gòu)架約束混凝土短柱受力性能的試驗研究和理論分析還很少,為了探究空間鋼構(gòu)架混凝土柱的受力性能,本文主要工作如下：以空間鋼構(gòu)架弦桿(角鋼)配鋼率(弦桿肢長)、橫向綴條的間距、橫向綴條的寬度、混凝土強度等級等為設計參數(shù),設計制作了18個空間鋼構(gòu)架混凝土短柱試件,進行了空間鋼構(gòu)架混凝土短柱軸心受壓性能試驗研究。試驗結(jié)果表明,隨著弦桿(角鋼)肢長的增大,綴條寬度的增大,綴條間距的減小,設置斜向綴條,混凝土強度等級的提高,空間鋼構(gòu)架對核心混凝土的約束作用增強,短柱試件的峰值荷載及變形能力提高。參照Mander模型中假定的矩形箍筋約束混凝土核心有效約束混凝土區(qū)域的確定方法,提出空間鋼構(gòu)架混凝土短柱核心截面的有效約束區(qū)域。結(jié)合本次空間鋼構(gòu)架混凝土短柱的試驗結(jié)果和已有試驗結(jié)果,提出了空間鋼構(gòu)架約束混凝土的峰值應力計算公式,為空間鋼構(gòu)架混凝土短柱軸壓承載力計算提供依據(jù)。在試驗研究和約束機理分析的基礎上,提出了兩種空間鋼構(gòu)架混凝土短柱軸壓承載力計算方法,前者考慮了空間鋼構(gòu)架約束混凝土強度的提高影響,計算公式與現(xiàn)行《混凝土結(jié)構(gòu)設計規(guī)范》(GB50010-2010)相銜接,后者同時考慮了空間鋼構(gòu)架約束混凝土強度提高影響和空間鋼構(gòu)架弦桿(角鋼)強度降低的影響。兩種計算公式的計算值與試驗值符合較好。
[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.
【學位授予單位】：蘇州科技學院
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：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.
【學位授予單位】：蘇州科技學院
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU398.9
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