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Inelastic displacement demand of bridge columns considering shear-flexure interaction

机译：考虑剪—挠相互作用的桥梁柱非弹性位移需求

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摘要

Reinforced concrete bridge columns exhibit complex hysteretic behavior owing to combined action of shear, bending moment, and axial force under multi-directional seismic shakings. The inelastic displacement of columns can be increased by shear-flexure interaction (SFI). This paper develops a simple yet reliable demand model for estimating the inelastic displacement and ductility based on the nonlinear time history analyses of 24 full-size columns subject to a suite of near-fault ground motions. A coupled hysteretic model is used to simulate the shear-flexure interactive (SFI) behavior of columns and the accumulated material damage during loading reversals, including pinching, strength deterioration, and stiffness softening. Guided by rigorous dimensional analysis, the inelastic displacement responses of bridge columns are presented in dimensionless form showing remarkable order. A dimensionless nonlinearity index is derived taking into account of the column strength, ground motion amplitude, and softening or hardening post-yield behavior. Strong correlation is revealed between the normalized inelastic displacement and the dimensionless structure-to-pulse frequency, the dimensionless nonlinearity index as well as the aspect ratio. Two regressive equations for displacement and ductility demands are proposed and validated against the simulation results. The SFI effects are discussed and included explicitly through the aspect ratio in the proposed model. This study offers a new way to realistically predict the inelastic displacement of columns directly from structural and ground motion characteristics.
机译：钢筋混凝土桥柱由于在多向地震振动下的剪切，弯矩和轴向力的共同作用而表现出复杂的滞后行为。柱的非弹性位移可通过剪切挠曲相互作用（SFI）来增加。本文基于24条全尺寸柱的非线性时间历程分析，开发了一套简单而可靠的需求模型，用于估算非弹性位移和延性，这些非线性柱历时经历了一组近断层地震动。耦合滞后模型用于模拟圆柱体的剪切-挠曲相互作用（SFI）行为以及在加载反向过程中累积的材料破坏，包括收缩，强度降低和刚度软化。在严格的尺寸分析的指导下，桥柱的无弹性位移响应以无量纲形式呈现，表现出显着的顺序。考虑到立柱强度，地震动幅度以及屈服后的软化或硬化行为，得出了无量纲非线性指标。归一化的非弹性位移与无量纲的结构到脉冲频率，无量纲的非线性指标以及长宽比之间都显示出很强的相关性。提出了位移和延性要求的两个回归方程，并针对仿真结果进行了验证。讨论并通过建议模型中的纵横比明确包括了SFI效果。这项研究提供了一种新的方法，可以直接从结构和地面运动特征真实地预测柱的非弹性位移。

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