高桩码头岸坡地震位移计算方法比较

Comparison of calculation methods for seismic displacement of bank slope of high-piled wharf

在强震区高桩码头设计中,基于位移的设计准则允许码头岸坡震后出现一定的位移,验算码头岸坡地震位移是高桩码头抗震设计的重要内容之一。依托某强震区高桩码头,针对目前广泛使用的基于NEWMARK刚性滑块位移理论的经验公式进行比较分析,如Makdisi&Seed公式、Martin&Qiu公式、Jibson公式、Saygili&Rathje公式、Jonathan公式等;并采用有限差分软件FLAC 2D进行动力时程分析验证。结果表明,尽管不同经验公式的位移估算结果存在一定的差异,但总体符合Jonathan提出的概率分布模型,动力时程分析法在位移评估上具有一定的优势。

In the design of high seismic intensity area,certain slope displacement after earthquake could be allowed based on displacement design criterion,so checking the seismic displacement is one of the important contents in seismic design of high-piled wharf.Based on the displacement theory of NEWMARK rigid slider,the empirical formulas,such as Makdisi&Seed formula,Martin&Qiu formula,Jibson formula,Saygili&Rathje formula and Jonathan formula,which are widely used in a high-pile wharf in a strong earthquake area,are compared and analyzed.The finite difference software FLAC 2D is used to verify the dynamic time history analysis.The results show that although the displacement estimation results of different empirical formulas are different,they generally conform to the probability distribution model proposed by Jonathan,and the dynamic time history analysis method has certain advantages in displacement evaluation.