腹部纵向配筋混凝土梁斜截面抗剪承载力

针对腹部纵向配筋混凝土梁，提出了将纵向水平普通钢筋与箍筋共同作为受力腹筋，从而形成整体抗剪受力模式的抗剪计算方法．基于平截面假定，可以计算得到混凝土梁抗剪承载力中混凝土承担的剪力部分．考虑纵向腹筋参与受力作用的桥梁抗剪承载力模型的试验，研究表明，纵向腹筋不仅可以承担主拉应力的水平分量、与箍筋同样起到抗剪的作用，并且可以推迟破坏斜裂缝的出现时间，减小斜裂缝的发展宽度，有效提高梁的刚度及抗剪承载力．

Shear Strength Investigation of Concrete Girders with Proposed Horizontal Shear Reinforcements in Webs

For the concrete girders with horizontal web reinforcement arranged along the depth of the web,the horizontal web reinforcement is proposed as integrated shear reinforcement with stirrups.So,the shear calculation method is established in which horizontal web reinforcements is stressed with stirrups together.According to the plane-section assumption,the shear strength provided by compression stresses in the concrete of concrete girders at ultimate stage can be calculated.A series of model girders with horizontal reinforcement in webs were fabricated and tested.The tests show that the horizontal web reinforcements can not only carry the horizontal component of the diagonal-tension stress that resists the shear force with stirrups together,but also delay the occurrence of diagonal cracking and reduce the width of diagonal cracks as well as increase the rigidity and shear strength of beams effectively.