Research on Simply Connection of Members for Mixed Structure

以下是对环形接头试验研究的总结。通过环缝静拉试验，观察到环缝内纵杆屈服和核心混凝土破碎两种破坏模式。在核心混凝土破碎的情况下，极限强度随着环高、拼接长度和杆径的增加而增大。由混凝土强度和杆径确定的极限应力可通过估算压应力能力来确定。采用梁试件进行的疲劳试验表明，在节点处发生局部弯曲可能会降低疲劳寿命。以下是对轴承式连接试验研究的总结。阐明了采用EC梁理论计算开裂荷载时，连接节点的粘结强度和受弯矩作用时连接节点处的受压区承受开裂后的剪力。在这种情况下，推导了剪切传递强度方程。

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.