控制矩形钢筋混凝土墙体钢筋屈曲的横向配筋设计与施工

M. Tripathi, R. Dhakal
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引用次数: 5

摘要

钢筋混凝土结构中的杆屈曲是一种常见的破坏模式,对其变形能力产生不利影响。为了限制延性钢筋混凝土墙体中的钢筋屈曲,设计规范只强调限制横向钢筋的间距,而没有认识到约束钢筋屈曲的有效刚度(即约束腿轴向刚度和间距的组合)的重要性。因此,本文总结了抗屈曲横向钢筋的设计要求,并对现有的抗屈曲横向钢筋设计方法提出了改进意见。为了确保塑性铰区域的横向配筋细节足以限制钢筋屈曲至单束间距,并控制钢筋因屈曲而引起的压应力恶化,提出了对现行详细程序的改进。横向钢筋的屈曲抑制能力取决于筋腿的轴向刚度,而由于屈曲而导致的钢筋压应力降低取决于其无支撑长度(在裸杆试验中)或屈曲长度,可以包括多个筋间距(在RC构件内部)。因此,对扎腿的轴向刚度和沿纵向钢筋的横向配筋间距都提出了限制。通过确保在潜在屈曲方向上的扎腿长度远低于使用基于力学的方法评估的临界长度,可以控制扎腿的有效轴向刚度。此外,通过限制横向钢筋间距与纵向钢筋直径的比值来控制钢筋的压应力退化,这样,在新西兰混凝土标准推荐的极限曲率处,由于屈曲而导致的纵向钢筋所承受的压应力的任何减少都在可接受的范围内。此外,还提出了避免边界区和腹板无约束钢筋屈曲的建议。采用所提出的设计方法,延性钢筋混凝土墙体纵向钢筋的屈曲可以延迟,屈曲对墙体侧向响应的不利影响可以得到控制,直到满足设计漂移或曲率要求。
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Designing and detailing transverse reinforcement to control bar buckling in rectangular RC walls
Bar buckling in RC structures is a commonly-observed failure mode that adversely affects their deformation capacity. To restrict bar buckling in ductile RC walls, design codes only emphasises on restricting the spacing of transverse reinforcement and does not recognise the importance of the effective stiffness of the ties (which is a combination of the tie leg axial stiffness and spacing) to restrict bar buckling. Therefore, in this paper the design requirements for anti-buckling transverse reinforcement are summarised, and improvements to the current design methodology for anti-buckling transverse reinforcement are proposed. To ensure that the transverse reinforcement detailing in plastic hinge regions is adequate to restrict bar buckling to single tie spacing and the compressive stress deterioration in bars due to buckling is controlled, refinements to the current detailing procedures are proposed. The buckling restraining ability of transverse reinforcement depends on the axial stiffness of the tie legs, while the compressive stress reduction in reinforcing bars due to buckling depends on their unsupported length (in bare bar tests) or buckling length that can include multiple tie spacing (inside RC members). Therefore, restrictions on both the axial stiffness of the tie legs and spacing of transverse reinforcement along the longitudinal reinforcing bars are proposed. The effective axial stiffness of tie legs is controlled by ensuring that the length of the tie legs in the direction of potential buckling is well below the critical length evaluated using a mechanics-based approach. Additionally, compressive stress degradation in reinforcing bars is controlled by limiting the ratio of the transverse reinforcement spacing and the longitudinal bar diameter such that any reduction of compressive stress carried by the longitudinal bars due to buckling at the limiting curvature recommended by New Zealand Concrete Standard is within an acceptable range. Furthermore, recommendations to avoid buckling of unrestrained reinforcing bars in the boundary zone and the wall web are proposed. Using the proposed design methodology, buckling of longitudinal reinforcing bars in ductile RC walls can be delayed and the detrimental effects of buckling on the lateral response of walls can be controlled until the design drift or curvature demands are met.
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来源期刊
CiteScore
2.50
自引率
17.60%
发文量
14
期刊最新文献
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