Effects of Hoop in Steel and R/C Composite

本研究的主要结论如下：(a)“钢”-“混凝土”-“箍筋”组合的钢筋混凝土结构体系具有相当好的抗震性能。(b)在受弯剪裂缝的钢筋混凝土构件中，弯剪裂缝集中在临界截面，未观察到弯剪裂缝。环箍加固改善了混凝土的抗压性能，并保护钢免于局部屈曲。(d)箍筋有助于构件在各种荷载条件下的延性。(e)受压作用下SRC构件的变形除了受压应变的影响外，还受h型钢本身存在的影响，沿斜裂纹方向滑动。SRC的压缩力与变形之间的关系不能用混凝土和钢的总和来评价。(f)弯剪作用下构件临界截面处的最大弯矩大于受弯作用下的最大弯矩。受弯剪构件内混凝土的压应力-应变关系应受到相邻实心混凝土约束的影响。

The main conclusions of this study are as follows; (a) The proposed SRC system, 'steel' - 'concrete' - 'hoop reinforcement' composite has quite good aseismic performance. (b) Flexural cracks concentrated at the critical sections in the proposed SRC members subjected to bending-shear cracks, and flexural-shear cracks were not observed. (c) Hoop reinforcement improved the compressive behaviour of the concrete and protected the steel from local buckling. (d) Hoop reinforcement contributed to the ductility of members under various loading conditions. (e) Deformation of the SRC member under compression is due not only to compressive strain but also to slip along the inclined crack, and affected by the existance of the H-shaped steel itself. The relation between compressive force and deformation of SRC cannot be evaluated as the sum of those of concrete and steel. (f) The maximun moment carried at the critical sections of members under bending-shear were greater than those under bending. Compressive stress - strain relationship of concrete in the members under bending-shear should be affected by the restraint of thr neighbouring solid concrete.