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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Simplified seismic design approach for steel portal frame piers with hysteretic dampers
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Simplified seismic design approach for steel portal frame piers with hysteretic dampers

机译：带有滞回阻尼器的钢门式框架墩简化地震设计方法

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摘要

A simplified seismic design procedure for steel portal frame piers installed with hysteretic dampers is proposed, which falls into the scope of performance-based design philosophy. The fundamental goal of this approach is to design a suite of hysteretic damping devices for existing and new bridge piers, which will assure a pre-defined target performance against future severe earthquakes. The proposed procedure is applicable to multi-degree-of-freedom systems, utilizing an equivalent single-degree-of-freedom methodology with nonlinear response spectra (referred to as strength-demanded spectra) and a set of formulae of close-form expressions for the distribution of strength and stiffness produced in the structure by the designed hysteretic damping devices. As an illustrative example, the proposed procedure is applied to a design of a simple steel bridge pier of portal frame type with buckling-restrained braces (one of several types of hysteretic dampers). For the steel portal frame piers, an attempt is made to utilize not only the displacement-based index but also the strain-based index as pre-determined target performance at the beginning of design. To validate this procedure, dynamic inelastic time-history analyses are performed using the general-purpose finite element program ABAQUS. The results confirm that the proposed simplified design procedure attains the expected performance level as specified by both displacement-based and strain-based indices with sufficient accuracy.
机译：提出了一种简化的设计方法，适用于装有滞后阻尼器的钢门式框架墩，该设计方法属于基于性能的设计思想范围。这种方法的基本目标是为现有和新的桥墩设计一套滞后阻尼装置，以确保预先设定的目标性能可应对未来的严重地震。所提出的程序适用于多自由度系统，它利用具有非线性响应谱（称为强度要求谱）的等效单自由度方法和一组近似形式的公式来计算通过设计的滞后阻尼装置在结构中产生的强度和刚度分布。作为说明性示例，建议的过程应用于带有屈曲约束支撑（几种滞后阻尼器之一）的门框式简单钢桥墩的设计。对于钢门式框架墩，在设计之初就尝试不仅将基于位移的指标而且将基于应变的指标用作预定目标性能。为了验证此过程，使用通用有限元程序ABAQUS进行了动态非弹性时程分析。结果证实，所提出的简化设计程序以足够的精度达到了基于位移和基于应变的指标所指定的预期性能水平。

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