为实现弹性多跨桥梁,进行了纵向屈曲约束支撑设计

Homero Carrion-Cabrera, M. Bruneau
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引用次数: 0

摘要

由屈曲约束支撑(brb)组成的双向延性膜片的多跨桥梁,可以以低成本提供无损伤柱的弹性桥梁,同时将位移需求降至可轻松容纳的水平。为了更好地理解这种类型的桥梁的行为及其优势,考虑墩刚度、BRB目标位移、BRB屈服位移和跨径数的变化,对普通多跨简支桥进行了参数化分析。对桥梁进行纵向分析。采用非线性响应历史分析设计brb。分析了所设计桥梁的需求,以了解所考虑的各种参数的影响。据观察,所提出的系统能够减少对桥墩的需求,例如保持它们的弹性,并限制伸缩缝的位移需求(这使得在改造情况下更容易防止脱落)。根据疲劳损伤计算,确定地震后无需更换brb。
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Longitudinal-direction design of buckling restrained braces implemented to achieve resilient multi-span bridges
Multi-span bridges having bi-directional ductile diaphragm consisting of Buckling Restrained Braces (BRBs) can provide resilient bridges with damage-free columns, at low cost, while minimizing displacements demands to levels that can be easily accommodated. Towards the goal of better understanding the behavior of this type of bridges and its advantages, a parametric analysis was performed with regular multi-span simply-supported bridges considering variations in pier stiffness, BRB target displacement, BRB yield displacement, and numbers of spans. Bridges were analyzed in the longitudinal direction. BRBs were designed using nonlinear response history analysis. The demands of the designed bridges were analyzed to understand the influence of the various parameters considered. It was observed that the proposed system is able to reduce the demands in piers such as to keep them elastic and limit the displacement demands in expansion joints (which makes it easier to prevent unseating in retrofit situations). It was also determined that, according to fatigue damage calculations, it is not necessary to replace BRBs after an earthquake.
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来源期刊
CiteScore
3.00
自引率
10.00%
发文量
48
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