用断裂力学理论研究无腹筋梁的受剪问题

Study on hear capacity of reinforced concrete beams without sterrups useng the fracture mechaical theory

简要地介绍了断裂力学理论在混凝土领域中的应用 ,结合混凝土 、 复合型裂纹断裂准则 ,并考虑混凝土梁中受拉钢筋对 K1 c的影响 ,分析了影响无腹筋钢筋混凝土梁受剪承载力的因素。

Because of the existence of the longitudinal reinforcing steel in reinforced concrete beams,the stress intensity factor K Ⅰ and K Ⅱ will be affected This should be considered when studying shear capacity of reinforced concrete beams using the criterion of combined mode fracture.Formulas for calculating K R I K C I are derived and a critical curve of combined mode fracture for reinforced concrete beams in obtained.The shear capacity can be easily got using the critical curve,the comparison between experimenting value of fshear capacity and calculated value shows that the two values fit well when the shear span is larger than 2.0.