Research on Simply Connection of Members for Mixed Structure

通过环缝的静拉试验，观察到环缝中纵筋屈服和核心混凝土破碎两种破坏模式。在核心混凝土被压碎的情况下，极限强度随着环高、拼接长度和钢筋直径的增加而增大。根据混凝土强度和钢筋直径，可以估算压应力的能力，从而确定极限应力。结果表明，由于接头处出现局部弯曲，可能会降低疲劳寿命。以下是对该轴承试验研究结果的总结。阐明了在弯矩作用下，开裂荷载的计算采用EC梁理论，考虑了节点的粘结强度，节点处的受压区抵抗开裂后的剪力。在此基础上推导了剪切传递强度的计算公式。

The followings are summary of what have been obtained in the experimental research of the loop joint.From static tension tests with loop joint, two types failure mode of yielding of longitudinal bar and crushing of core concrete in the loop joint are observed. In case of crushing the core concrete, ultimate strength is large as the loop height, the splice length and the bar diameter are increased Mechanical model for estimating the compressive stress of the core concrete is conducted. The capacity of the compressive stress can he estimated to define the limit stress determined form the concrete strength and the bar diameter From the fatigue tests using beam specimens, it is shown that the fatigue life may be decrease due to occur the local bending at the joint.The followings are summary of what have been obtained in the experimental research of the bearing-type connection.It is clarify that a cracking load is computed by using EC beam theory with the bond strength of the hearing-type connection and a compression zone at the connection resists to the shear force after cracking when the connection are subjected to bending moment. The equation for the shear transfer strength is conducted in such this case.