焊接箍筋钢筋混凝土构件抗剪承载力试验研究

EXPERIMENTAL STUDY ON SHEAR CAPACITY ON REINFORCED CONCRETE MEMBERS WITH WELDED STIRRUPS

为了研究焊接箍筋钢筋混凝土构件的受剪性能,对6根焊接箍筋钢筋混凝土框架短柱和3根普通箍筋钢筋混凝土框架短柱对比试件展开低周反复加载试验,以及5根焊接箍筋和4根普通箍筋钢筋混凝土梁斜截面受剪性能试验,分析混凝土强度、箍筋配箍率、轴压比和剪跨比对焊接箍筋钢筋混凝土框架柱和梁受剪承载力的影响,并对比焊接箍筋与普通绑扎箍筋钢筋混凝土框架短柱和梁的受剪承载力的区别。结果表明:焊接箍筋与普通绑扎箍筋钢筋混凝土框架短柱和梁的破坏形态基本相同,并且焊接箍筋钢筋混凝土框架短柱和梁的极限抗剪承载力高于普通箍筋钢筋混凝土框架短柱和梁。另外,用现行的GB 50010—2010《混凝土结构设计规范》规定的框架短柱和梁的抗剪承载力计算公式计算的结果偏低,因此进一步结合试验数据进行分析并拟合出焊接箍筋钢筋混凝土构件抗剪承载力计算式,计算值与试验结果较吻合,可用于工程设计。

Reversed cyclic loading tests were carried out on 6 reinforced concrete short columns with welded stirrups and 3 comparative reinforced concrete short columns with ordinary stirrups to study the shear properties of reinforced concrete members with welded stirrups .Also, the tests of 5 reinforced concrete beams with welded stirrups and 4 reinforced concrete beams with common stirrups were carried out to study the shear performance of inclined section . The influences of the factors such as the concrete strength , stirrup ratio, axial compression ratio and shear span ratio on the shear bearing capacity of reinforced concrete column and beam with welded stirrups were analyzed , and the differences of the shear bearing capacity between the welded stirrups and ordinary binding stirrups of reinforced concrete column and beam were compared .The results indicate that the damage form is basically the same ,and the shear bearing capacity of reinforced concrete column and beam with welded stirrups are higher than the ordinary elements.In addition, the shearing bearing capacity is low , when using the formula in the current “Code of Concrete Structure Design” （GB 50010-2010）.Therefore, the test data were analysed and the calculation formula of shear bearing capacity for reinforced concrete column and beam with welded stirrups was fitted out in this paper .It is shown that the calculation values are in good agreement with the test results , which can be used for engineering design .