摘要
研究等效速度脉冲地震作用下混凝土框架柱最不利抗剪性能。以混凝土框架结构底层柱为分析对象，采用等效正弦速度脉冲激励作为地震动输入，通过非线性动力时程分析，研究竖直和水平向联合速度脉冲地震作用对框架柱抗剪性能的影响，分析速度脉冲地震作用与竖向和水平向加速度峰值比、峰值输入时差、剪跨比以及基本振动周期等对抗剪需求和抗剪承载力的交互影响规律。结果表明：脉冲速度强度增大，框架柱抗剪需求增大；竖向与水平向峰值比增大，柱抗剪承载力减小。加速度峰值输入时差对柱的最不利抗剪性能有重要影响；剪跨比越大，速度脉冲的影响越显著。基于分析结果的非线性回归，建立了考虑速度脉冲及其交互因素影响的最不利剪力作用效应修正系数
Abstract
Most unfavorable shear behavior of concrete frame columns subjected to velocity pulse-like excitations is studied. First floor columns of reinforced concrete frame structures is used to investigate the effects of vertical and horizontal velocity pulse-like acceleration on shear behavior of concrete columns. Three equivalent velocity pulse sine excitations are employed to execute nonlinear dynamic time history analysis. Combined effects of vertical-to-horizontal peak acceleration ratio, arrival time interval of peak acceleration between vertical and horizontal excitations, shear span ratio, as well as fundamental period on shear-resistant demand and shear-resistant capacity is concerned with the assessment of the effect of velocity pulse action. The results demonstrate that shear-resistant demand of concrete columns increase with increasing intensity of velocity pulse, and shear-resistant capacity decrease with increasing vertical-to-horizontal peak acceleration ratio. Arrival time interval between vertical and horizontal excitations has an important influence on the most unfavorable shear behavior of concrete frame columns. At higher values of shear span ratio, the influence of velocity pulse excitations is significant. Nonlinear regression analysis of analytical data of the present study is carried out, and empirical approach considering different effect of these factors is proposed.
关键词
速度脉冲激励 /
混凝土柱 /
抗剪需求 /
抗剪承载力 /
耦合地震作用
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Key words
velocity pulse-like excitation /
concrete column /
shear-resistant demand /
shear-resistant capacity /
coupled earthquake action
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周 靖;方小丹.
速度脉冲激励作用下混凝土框架柱抗剪性能研究[J]. 振动与冲击, 2011, 30(10): 109-115
ZHOU Jing;FANG Xiao-dan .
Shear-resistant behavior of concrete frame columns subjected to velocity pulse-like excitations[J]. Journal of Vibration and Shock, 2011, 30(10): 109-115
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