1.四川大学土木工程系,四川 成都 610065
2.张家港市建筑安全监督站,江苏 苏州 215600
王健泽(1990-),男,助理研究员。主要从事土木工程防灾减灾方面的研究。E-mail:jzwang@scu.edu.cn
戴靠山(1977-),男,教授,博导。主要从事土木工程防灾减灾方面的研究。E-mail:kdai@scu.edu.cn
收稿:2020-12-28,
修回:2021-04-15,
纸质出版:2022-08-28
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王健泽,钱雨凡,戴靠山等.基于增量动力分析的近场框架结构楼层加速度响应研究[J].防灾减灾工程学报,2022,42(04):835-843.
WANG Jianze,QIAN Yufan,DAI Kaoshan,et al.Floor Acceleration Response on Near‑fault Frame Structures based on Incremental Dynamic Analysis Method[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(04):835-843.
王健泽,钱雨凡,戴靠山等.基于增量动力分析的近场框架结构楼层加速度响应研究[J].防灾减灾工程学报,2022,42(04):835-843. DOI: 10.13409/j.cnki.jdpme.20201228006.
WANG Jianze,QIAN Yufan,DAI Kaoshan,et al.Floor Acceleration Response on Near‑fault Frame Structures based on Incremental Dynamic Analysis Method[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(04):835-843. DOI: 10.13409/j.cnki.jdpme.20201228006.
地震作用一般可分解为两个水平分量和一个竖向分量。近场地震的竖向分量较大,但水平与竖向地震动共同作用下楼层组合加速度响应的影响鲜有研究。以三个不同高度的规则钢框架结构作为研究对象,选择与竖向目标谱匹配的竖向地震动及对应的水平向地震动共同作为地震输入,定义楼层水平和竖向绝对加速度的SRSS值为楼层组合加速度,研究结构最大水平加速度与组合加速度的比值沿着楼层高度的变化趋势。随后开展增量动力分析,经KS检验,发展了最大水平加速度与组合加速度比值的超越概率模型,分析水平加速度占比与地震强度的关系。最后,提出水平加速度占比沿结构高度分布的经验拟合公式。结果表明,随着结构楼层相对位置高度的增加和地震强度的增大,水平加速度占比逐渐减小,且近场非脉冲地震动下的水平加速度占比大于脉冲地震动。提出的拟合公式能够较好地反映水平加速度占比的变化趋势。
Earthquake effect is usually simplified as two horizontal components and one vertical component. The vertical component of near-fault earthquake together with horizontal components is influential to floor responses of building structures, but such influence has been rarely studied. Three special steel moment-resisting frames with different heights are focused. Vertical ground motions and corresponding horizontal ground motions matching the vertical design spectrum are selected as the seismic inputs. The obtained SRSS value of horizontal and vertical floor accelerations is defined as the combined floor acceleration. The variation of the
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ratio (i.e. the maximum horizontal acceleration to the combined acceleration) along the height is studied. In addition, incremental dynamic analysis is carried out on the considered three buildings. The probability model which is used to describe the relationship between the
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hmax
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ratio and earthquake intensity is developed and verified by KS test. Finally, the empirical fitting formula of the
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ratio along the structure height is proposed. The results presented in this study show that with the increase of relative height and earthquake intensity, the
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ratio decreases gradually. Under the action of near-fault non-pulse ground motions, the
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hmax
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ratio is larger than that under pulse ground motions. The developed empirical formula can perfectly predict the distribution of the
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ratios.
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