| 高树飞,荆范礼,冯云芬.双向水平地震作用下高桩码头地震效应组合方法研究*[J].水运工程,2024,(1):22-30 |
| 双向水平地震作用下高桩码头地震效应组合方法研究* |
| Combination rule ofseismic effectsfor pile-supported wharves under bi-directional horizontal ground motions |
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| DOI： |
| 中文关键词: 高桩码头 双向水平地震作用 时程分析 振型分解反应谱分析 扭转效应 |
| 英文关键词:pile-supported wharf bi-directional horizontal ground motions time history analysis modal response spectrum analysis torsional effect |
| 基金项目:山东省自然科学基金资助项目(ZR2018BEE046)；聊城大学科研基金资助项目(318012111) |
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| 中文摘要: |
| 高桩码头在双向水平地震作用下会出现扭转效应，我国码头设计规范对此并无具体规定，但国内建筑结构设计规范和国外码头设计规范一般是将结构在两个主轴方向的单向水平地震作用效应进行组合来处理类似问题。为验证规范中的组合方法对码头的适用性和准确性，选取30组双向水平地震动记录，对码头案例进行时程分析和振型分解反应谱分析。按规范的组合方法计算反应谱分析得到的桩基内力，再计算组合值与时程分析所得内力之比，并进行统计分析。对内力比均值进行回归分析，以提出桩基内力修正系数计算公式。研究结果表明：1)双向地震作用下桩基内力比单向地震作用下大得多，抗震分析时应考虑双向地震的影响。2)相较于国外码头设计规范所用的组合方法，采用国内建筑规范中的平方和方根法组合得到的内力与时程分析结果的相关性更好，所得内力比服从对数正态分布且均值接近1，离散程度较小，建议将此法用于码头抗震分析。3)对于长周期码头结构，组合方法会低估地震反应，应使用所提出的公式对桩基内力予以修正。 |
| 英文摘要: |
| Torsional effect will occur in pile-supported wharves under bi-directional horizontal ground motions.The Chinese code for wharf seismic design does not provide specified provision for that phenomenon.Nevertheless,in domestic code for seismic design of buildings and foreign wharf codes,similar problem is addressed by combining the effects of action in two principal horizontal directions of the structure under single directional ground motion.To verify applicability and accuracy of the combination rules from aforementioned codes in pile-supported wharves,30 pairs of horizontal ground motion records are selected to conduct time history analyses and modal response spectrum analyses for different wharves.The internal forces of pile determined by spectrum analyses were combined in accordance with rules in codes,and the internal force ratios of combined values and forces from time history analyses are calculated.Then statistical analysis is conducted on the internal force ratios,and the formula of correction coefficient for internal forces is proposed by the regression analysis of average values for force ratios.The results show that:1)The internal forces of pile under bi-directional ground motions are much larger than those of single ground motion.Thus,the seismic analysis of wharf should consider the effect of bi-directional motions.2)The correlation between the internal forces determined by the square root of the sum of the squares(SRSS)rule in the Chinese building code and the time history method is better than that of the combination rule in foreign wharf design code.The internal force ratio determined by the combination rule in Chinese code obeys lognormal distribution and its average values approach the value of one,with a smaller dispersion of force ratio.Consequently,SRSS rule is recommended for seismic analysis of wharves under bi-directional ground motions.3)For long-term pier structures,the combination method may underestimate the seismic response,and the proposed formula should be used to correct the internal forces of the pile foundation. |
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