型钢混凝土T形柱斜截面承载力研究

为研究型钢混凝土T形柱负弯矩区的抗剪性能,设计4个T形试件进行静力单调加载试验,主要考虑剪跨比、配钢形式、配箍率、截面形式4个变化参数,试验过程中捕捉到混凝土应变、型钢应变、角钢应变、跨中挠度等一系列重要数据,并绘制出剪力-挠度,荷载-应变等重要关系曲线,给出混凝土截面应变的分布情况,采用能量等值法分析试件的剪切延性,探讨设计参数对抗剪承载力的影响,给出型钢混凝土T形柱斜截面承载力的计算公式。试验研究和理论分析结果表明:型钢混凝土T形柱的破坏形态有弯剪破坏、剪切粘结破坏,混凝土平均应变沿截面高度分布符合平截面假定;基于叠加法得到的受剪承载力计算公式可以用于计算型钢混凝土T形柱的斜截面剪切强度。

STUDY ON OBLIQUE SECTION BEARING CAPACITY OF STEEL REINFORCED CONCRETE T-SHAPED COLUMNS

In order to study shear bearing capacity of the steel reinforced concrete T-shaped columns in negative moment zone,4 specimens with different shear span ratios,steel form,stirrup ratios and sectional form were designed and produced to carry out monotonic static loading test.A series of important data were captured including concrete strain,steel strain,angle steel strain,mid-span deflection and the curves of shear-deflection,load-strain were drawn,concrete strain distribution along section height was given.Shear ductility was analyzed with energy equivalent method,and the impact of parameters on the shear capacity was investigated,the formula for calculating capacity was proposed.It is shown that bending shear failure and shear bond damage occurred on the speimens.Average concrete strain of T-shaped section along section height conformed plane section assumption.Based on superposition method,the calculation formula of shear capacity could be used to calculate shear strength of inclined section in steel reinforced concrete T-shaped columns.