NZS1170.5 2016地震棘轮规定的解释和评估

K. Saif, T. Yeow, C. Lee, G. MacRae
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引用次数: 1

摘要

在地震事件中,一些结构屈服后倾向于棘轮和向一个方向的位移大于向相反方向的位移,导致较大的峰值和残余位移。2016年NZS1170.5修正案提供了定义地震棘轮趋势和由此产生的位移放大的规定。本文提出了一些见解,导致棘轮的因素,以及解释和评价拟议的规定。首先,讨论了动力稳定、偏心重力载荷和前后方向结构强度不平衡引起的地震棘轮力学。随后,通过NZS1170.5注释示例对新规定进行了详细说明和演示。然后提出作者对条款的解释,确定可能混淆的领域,并提出修改措辞以提供一致性和清晰度的建议。最后,利用偏心重力荷载作用下单自由度钢筋混凝土桥柱的独立研究结果,对2016年修订中提供的位移放大系数进行了评估。结果表明,除了延性系数较高或非弹性双线性响应的柱具有明显的棘轮倾向外,所提出的位移放大法是合理的。
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Interpretation and evaluation of NZS1170.5 2016 provisions for seismic ratcheting
During seismic events, some structures have a tendency to ratchet and displace more in one direction than in the opposite direction after yielding, resulting in larger peak and residual displacements. Provisions to define the tendency for seismic ratcheting and the resulting displacement amplification are provided in the 2016 amendments of NZS1170.5. This paper presents some insight into the factors causing ratcheting, along with interpretation and evaluation of the proposed provisions. Firstly, the mechanics of seismic ratcheting due to dynamic stability, eccentric gravity loads, and unbalanced structural strengths in the back-and-forth directions are discussed. Afterwards, the new provisions were detailed and demonstrated by working through the NZS1170.5 commentary examples. The authors’ interpretation of the provisions is then presented, potential areas of confusion are identified, and wording changes to provide consistency and clarity are proposed. Finally, the displacement amplification factors provided in the 2016 amendments were evaluated using results of an independent study on single-degree-of-freedom reinforced concrete bridge columns subjected to eccentric gravity loading. It was found that the displacement amplification method proposed was reasonable, except when columns designed with a high ductility factor or which exhibit inelastic bilinear response had a significant tendency for ratcheting.
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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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