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| 1 | Earthquake acceleration analysis using wavelet method显示文摘There are several methods for analyzing the acceleration of an earthquake.In this research,a discrete wavelet theory based on the Mallat method was employed to analyze the acceleration of earthquake records.For this purpose,first,the acceleration of the main earthquake was determined using the method of banding,filtering and correction of a filtered wave.Then,the acceleration of the earthquake up to five stages was decomposed using discrete wavelet theory.In this method,in which the Down-Sampling rule is utilized in each step,the number of earthquake record points is half past.Each of the waveforms was based on the acceleration of the maximum original earthquake,and the maximum acceleration in all the waves was identical.For each of the five waves obtained from wavelet decomposition,the velocity curve and ground acceleration are obtained and compared with each other.Finally,a structure was analyzed using the main wave of the earthquake and each of the waveforms was analyzed in five stages and their dynamic response curves were compared.The results showed that until the third stage of the wavelet decomposition,the error was insignificant and the dynamic response to the magnitude of the earthquake was small.The analysis time is about 10% of the analysis time with the main wave,and the error is less than 6%. | Ali Heidari Noorollah Majidi | 2021 | Earthquake Engineering and Engineering Vibration2021，20，1： | 0 |
| 2 | 排水桩加固及动力荷载强度对可液化地层中盾构隧道动力响应的影响显示文摘目的:隧道工程作为大型地下结构工程之一,穿越可液化地层时面临着较大的液化破坏风险。对此,需分析排水桩加固及动力荷载强度对可液化地层中盾构隧道动力响应的影响。方法:建立了可液化土层中液化动力响应的数值分析模型,并通过实际工程案例验证了该模型的有效性。依托上海市轨道交通崇明线工程,应用该模型进行液化场地加固动力响应分析,评价了液化场地采用排水桩加固措施的效果和加固作用范围,分析了不同动力荷载强度下隧道穿越可液化地层的动力响应。结果及结论:Plaxis2D软件中的UBC3D-PLM本构模型可有效模拟可液化地层中的孔压动力响应;在一定范围内隧道两侧的排水桩可有效抑制动荷载作用下可液化土层液化的发生;动力荷载强度主要对超孔压积累和增长模式产生有影响;当动力荷载加速度峰值达到0.2 g(g为重力加速度)后,可液化土层超孔压比累积增长规律基本一致,均在振动初期达到完全液化,并且超孔压随着振动荷载作用时间的增加而趋于稳定。 | 冯义 | 2023 | 城市轨道交通研究2023，26，8： | 0 |
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