Strength of a Frame using New Type of Beam-to-Column Connection for CFT

对具有矩形钢管柱和四根组合梁的三维框架进行了试验，并根据试验数据讨论了钢筋混凝土杆的有效宽度。试件梁采用螺柱螺栓连接h型钢梁与RC板，梁与无隔板柱筒焊接，梁方向与矩形管截面对角方向一致。试验参数为：1)柱型：钢管混凝土和空钢管混凝土；2)荷载形式：自重荷载和水平荷载。这种连接形式的框架可以设计为受梁屈服形式下的倒塌。得到了板坯有效宽度的流动结果。1)对于组合梁的极限强度，在重力荷载作用下，RC板的全宽度对有CFT柱的框架是有效的。对于受水平荷载作用的框架，楼板的有效宽度小于受重力荷载作用下框架的有效宽度，这是由于框架梁在水平荷载作用下受到位移弯矩的影响。2)对于弹性刚度，梁的板坯在纵弯（板坯侧因弯曲而受拉）下的有效宽度小于在下垂弯曲（板坯侧因弯曲而受压）下的有效宽度。

3-D frames with a rectangular steel tube columns and four composite beams are tested, and effective width of the RC stab are discussed based on the experimental data.Beams of the specimen, which are connected H-shaped steel beam and RC slab by using stud bolt, are welded to the column tube without diaphragm, and the direction of the beam coincides with the diagonal direction of the rectangular tube section.Test parameters are1) column type : concrete filled tube and vacant tube2) loading pattern : gravity load and horizontal loadIt is recognized that frames with this type of connection can be designed to collapse under beam-yield type. And flowing results about effective width of the slab are obtained.1) For ultimate strength of the composite beamFull width of the RC slab are effective for frames with a CFT column under the gravity load.For the frame subjected to horizontal load, effective width of the slab is smaller than that of the frame under gravity load, This is resulted from beams of frame under horizontal load are subjected to totional moment.2) For elastic rigidityEffective width of the slab of the beam subjected to hogging bending (slab side tension due to bending) is smaller than that under sagging bending (slab side compression due to bending).