This paper is concerned with the evaluation of the seismic resistant dynamical characteristics of composite foundation . the dynamical finite element numerical analysis is performed for this purpose . comprehensive analysis has been made to research characteristics of ground motion and ground seismic resistant of composite foundation to promote its application in seismic area 本文通过动力有限元数值分析对复合地基的抗震特性进行了评价，较全面地分析了地震作用下复合地基的地面运动特性和地基自身的抗震特性，旨在推进复合地基这一地基加固形式在地震区的推广应用。
It supports the aircraft during parking and endures the loads during ground maneuvers . most of the vertical and horizontal kinetic energy are absorbed and dissipated by landing gear . it plays an extreme important role in preventing the airframe from vibration and excessive impact forces , improving passenger comfortable characteristics and increasing aircraft flight safety 飞机起落架作为飞机结构的一个重要部件,承受着飞机与地面接触时产生的静、动载荷,吸收和消耗飞机在着陆撞击、跑道滑行等地面运动时所产生的能量,在减缓飞机发生振动,降低飞机地面载荷,提高乘员舒适性,保障飞机飞行安全等方面发挥着极其重要的作用。
The reliability of the observation data in long period range is particularly inspected . this is done " by verifying the instrument response characteristic , examining the signal - to - noise ratio , comparing the recovered ground motions and response spectra from the velocity type and acceleration type digital broad - band records 对于速度型和加速度型的数字宽频带记录，从仪器特性、恢复的地面运动对比、信噪比研究、反应谱对比等方面研究这类记录在长周期段的可靠性。
In this paper , the authors give a description of the strong motion and damage caused by the earthquake of ms 7 . 4 occurring in izmit , turkey on august 17 , 1999 , including the strong ground motion of the izmit earthquake of ms 7 . 4 , the earthquake intensity distribution , the earthquake damage and preliminary analysis on the cause of earthquake damage 介绍了1999年8月17日土耳其伊兹米特7 . 4级地震的强地震动和地震灾害，包括：伊兹米特7 . 4级地震的强地面运动、地震烈度分布、地震震害以及地震破坏原因浅析。
For the purpose of wavelet ' s basic concept and wavelet transform fundamental principle , four wavelets : littlewood - paley wavelet , meyer wavelet , harmonic wavelet and odd exponent wavelet are used to analyze structural response under earthquake ; experimental investigation has been carried out for two - stories frame model ; this paper also analyzes earthquake ground motion energy and structural energy response based on wavelet ; this paper proposes dynamic reliability analysis for structure seismic response based on wavelet 针对小波的基本概念、小波变换的基本原理，本文提出了用四种小波： littlewood ? paley小波， meyer小波，谐波小波，单边指数小波来进行结构地震反应分析、并对二层框架模型进行振动台试验研究、也进行了在小波基下的地震地面运动能量分析和结构地震能量反应、以及结构地震反应在小波基下的动力可靠性分析。
