受压构件的配筋构造要求

8.8 受压构件的配筋构造要求
箍 筋：
受压构件中箍筋应采用封闭式，其直径不应小于d/4，且不小 于6mm，此处d为纵筋的最大直径。 ◆ 箍筋间距不应大于400mm，也不应大于截面短边尺寸；对绑 扎钢筋骨架，箍筋间距不应大于15d；对焊接钢筋骨架不应 大于20d。d为纵筋的最小直径。 ◆ 当 柱 中 全 部 纵 筋 的 配 筋 率 超 过 3% ， 箍 筋 直 径 不 宜 小 于 8mm，且箍筋末端应应作成135°的弯钩，弯钩末端平直段 长度不应小于10箍筋直径，或焊成封闭式；箍筋间距不应大 于10倍纵筋最小直径，也不应大于200mm。 ◆ 当柱截面短边大于400mm，且各边纵筋配置根数超过多于3 根时，或当柱截面短边不大于400mm，但各边纵筋配置根 数超过多于4根时，应设置复合箍筋。 ◆ 对截面形状复杂的柱，不得采用具有内折角的箍筋，以避免 箍筋受拉时使折角处混凝土破损。
8.8 Detailing requirements for reinforcement:
◆ The
diameter of the longitudinal rods should not be smaller
than 12mm，and the larger diameter rods are recommended, and the number of rods in the member should not be less than 4，in circular sections, should not be less than 8.
◆
8.8 受压构件的配筋构造要求
◆ If the longitudinal steel ratio is greater than3% ， the diameter of the ties should not be less than 8mm，The ties may be welded into closed hoops, or have both ends bent through a 135°angle hook and the length should not less than 10 times of the diameter of the ties； The spacing of the ties should not be greater than the smallest longitudinal rods or200mm。 ◆ When a side is greater than 400mm and the number of longitudinal rods on the side is in excess of 3 bars, or less than 400mm and the number is in excess of 4 bars, additional lateral links will be need besides the closed ties. ◆ For the column with a complicated section should not be use the stirrup with a inside angle to avoid the failure of the concrete.
◆ The requirement of the cover of the concrete
is in table 8-3，
and no less than d。
8.8 受压构件的配筋构造要求
◆ The
clear spacing of longitudinal bars should not be less than
periphery should not exceed 350mm.When h≥600mm， additional longitudinal rods with a diameter of 10~16mm should be placed on the lateral sides.
8.8 受压构件的配筋构造要求
◆
8.8 受压构件的配筋构造要求
复杂截面的箍筋形式
8.8 受压构件的配筋构造要求
Keynotes: 1. Axial load capacity of column with axial load only 2. Capacity of column with combined axial load and moment 3. Failure mode 4. Interaction diagram of axial load and moment 5. Eccentricity magnification factor 6. Calculation method 7. Shear strength of column 8. Ductility and confinement 9. Reinforcement detailing, minimum reinforcement ratio
50mm；
◆When
the prefabricated column is cast horizontally, the
smallest diameter should follow the code.
◆ Spacing
between longitudinal bars measured along the
配筋构造：
◆ 柱中纵向受力钢筋的的直径d不宜小于12mm，且选配钢筋时
宜根数少而粗，但对矩形截面根数不得少于4根，圆形截面根 数不宜少于8根，且应沿周边均匀布置。
◆ 纵向钢筋的保护层厚度要求见表8-3，且不小于钢筋直径d。 ◆ 当柱为竖向浇筑混凝土时，纵筋的净距不小于50mm； ◆ 对水平浇筑的预制柱，其纵向钢筋的最小应按梁的规定取
百度文库
值。
◆ 截面各边纵筋的中距不应大于350mm。当h≥600mm时，在
柱侧面应设置直径10~16mm的纵向构造钢筋，并相应设置复 合箍筋或拉筋。
8.8 受压构件的配筋构造要求
8.8 受压构件的配筋构造要求
Lateral ties ：
The diameter of the ties should not be less than d/4 of the diameter of the largest longitudinal rods ，and in no case be less than 6mm，and the ties in the compressive member should be closed. ◆ The spacing should not be greater than the shorter side of the section or 400mm ； In a tied and welded skeleton member, the spacing of the ties along the length of the member should not be greater than 15d and 20d respectively. Here d is the diameter of the smallest longitudinal rods。
8.8 受压构件的配筋构造要求