GZZ-1型自振柱试验机研制与性能试验   总被引：23，自引：3，他引：23  

陈国兴  朱定华  何启智 《地震工程与工程振动》2003,23(1):110-114

作者研制成功GZZ－1型自振柱试验机，该机和动三轴试验机共用一套控制、采集及气压系统，并把纵向共振和自振柱集成为一套系统。实现了计算机自动控制及数据处理程序化。性能试验表明，该试验机动态响应好，运行可靠，操作方便，具有较高的试验精度。  相似文献   

乳化沥青箱的结构控制研究     

徐家云  钟珞 《地震工程与工程振动》2003,23(1):166-169

本文在TLD基础上，提出了乳化沥青箱。因乳化沥青比水的阻尼高许多倍，故控制效果优于水箱。算例表明：它是优于TLD的控制器。  相似文献   

高层建筑动力反应实测中测点的优化布置方法的研究   总被引：3，自引：0，他引：3  

李正农  刘福义  李秋胜  吴红华 《地震工程与工程振动》2003,23(5):149-156

本文对高层建筑动力反应实测中测点的优化布置方法进行了研究，研究了几种表示测点布置是否最优的适应度函数，并且应用最优化计算方法来寻找测点最优或接近优化的布置。本文还通过一个高层建筑动态响应测试的实例，说明了具体的应用方法。实际计算表明，用本文方法布置测点所测得的结构动态响应结果有相当高的精度。  相似文献   

车辆-轨道系统振动响应分析--Timoshenko梁与Euler梁轨道模型的比较   总被引：1，自引：0，他引：1  

徐志胜  翟婉明  王开云  王其昌 《地震工程与工程振动》2003,23(6):74-79

近年来，铁路的高速化、高运量化以及轻微的地震灾害等因素加速了轨道结构的沉降或变形，导致车辆轨道系统振动的加剧。本文运用车辆-轨道耦合动力学理论，编制了基于Timoehenko梁钢轨模型的车辆-轨道耦合振动仿真分析软件，分析了车辆-轨道系统的垂向振动特性，并与基于Euler梁模型的VICT软件的仿真结果进行了比较分析。结果表明：仿真结果与VICT的仿真结果基本一致，但在较高频域，前者能更好地反映轮轨系统的高频特性。因而，在研究轮轨高频振动及轮轨噪声时。采用Timoshenko梁钢轨模型更具合理性。  相似文献   

一种深海热液原位探测设备供能装置的设计          下载免费PDF全文

吴怀超  谭春阳  金波  杨灿军  陈鹰 《海洋科学》2011,35(2):82-85

为了解决深海热液原位探测设备的能量供给问题,设计了一种实用的供能装置.该供能装置采用了一种定制的高能量密度电池,电池组的容量达31.5 Ah,最大输出电压为12 V.供能装置的耐压壳体采用了压力容器的设计原则进行设计,其最大承受压力达70MPa.放电实验表明该供能装置具有较稳定的放电电压;海试实验表明该供能装置能用于深...  相似文献   

基于实测的导管架海洋平台振动对人员安全评价     

车啸飞  张大勇  岳前进  樊哲良 《海洋工程》2011,29(4):68-73

目前我国的海洋工程结构中,导管架式海洋平台占有很大比重,动荷载作用下导管架式海洋平台的振动问题日益突出。随着石油开发向深海进军,平台结构柔性更大,振动问题更为显著,可能对结构、设备及人员造成一定的安全隐患。基于现场监测获得的导管架平台振动响应,结合相关规范给出振动对人体的影响,提出人员感受评价流程。最后,以渤海、南海海域的导管架平台为例,基于现场监测,分析了结构的振动特性及作业人员在相应振动环境下的感受。此方法对导管架平台上部作业人员的工作与安全保障提供了科学依据。  相似文献   

减震装置提高防护门抗力的理论分析     

宋春明  王明洋  刘斌 《地震学刊》2011,(6):700-703,709

在端部采用减震装置可提高防护门的抗力,而且该减震装置会影响防护门的振动特性和动力响应,因此对其在爆炸载荷作用下的动态响应分析非常重要。本文建立了具有减震装置防护门的计算模型,推导出了结构在爆炸荷载作用下的解析计算式,分析了化爆和核爆荷载作用下减震装置对振动的影响规律。结果表明,由弹性支承和阻尼器组成的减震装置可以明显降低结构的动力系数,从而提高防护门的抗力,但提高的效果与弹性支承的刚度、载荷作用时间的长短以及振动衰减的程度相关。  相似文献   

考虑人体舒适度的大型火车站房楼盖振动控制研究     

操礼林  李爱群  陈鑫 《地震学刊》2011,(1):75-79

近年来,各地纷纷兴建大型火车站房,这类建筑中的楼盖大多为大跨、轻质和低阻尼结构,本文基于人体舒适度考虑,对这些大跨楼盖进行振动舒适度的分析。首先,建立某大型火车站房的整体有限元模型,研究这类建筑中大跨楼盖的振动特性;随后,对楼盖在各种不利工况人群荷载作用下的振动舒适度进行分析;最后,在已有研究的基础上,提出了大跨楼盖多重调谐质量阻尼器（Multiple Tuned Mass Dampers,简称MTMD）减振设计方法。结果表明,利用该方法设计MTMD减振系统,可以有效地控制大跨楼盖的竖向振动,各工况下的平均减振率可达34%,从而使结构在使用时满足人体舒适度的要求。  相似文献   

Control of the earthquake and wind dynamic response of steel‐framed buildings by using additional braces and/or viscoelastic dampers     

Fabio Mazza  Alfonso Vulcano 《地震工程与结构动力学》2011,40(2):155-174

The insertion of steel braces equipped with viscoelastic dampers (VEDs) (‘dissipative braces’) is a very effective technique to improve the seismic or wind behaviour of framed buildings. The main purpose of this work is to compare the earthquake and wind dynamic response of steel‐framed buildings with VEDs and achieve optimal properties of dampers and supporting braces. To this end, a numerical investigation is carried out with reference to the steel K‐braced framed structure of a 15‐storey office building, which is designed according to the provisions of Eurocodes 1 and 3, and to four structures derived from the first one by the insertion of additional diagonal braces and/or VEDs. With regard to the VEDs, the following cases are examined: absence of dampers; insertion of dampers supported by the existing K‐braces in each of the structures with or without additional diagonal braces; insertion of dampers supported by additional diagonal braces. Dynamic analyses are carried out in the time domain using a step‐by‐step initial stress‐like iterative procedure. For this purpose, the frame members and the VEDs are idealized, respectively, by a bilinear model, which allows the simulation of the nonlinear behaviour under seismic loads, and a six‐element generalized model, which can be considered as an in‐parallel‐combination of two Maxwell models and one Kelvin model. Artificially generated accelerograms, whose response spectra match those adopted by Eurocode 8 for a medium subsoil class and for different levels of peak ground acceleration, are considered to simulate seismic loads. Along‐wind loads are considered assuming, at each storey, time histories of the wind velocity for a return period T_r=5 years, according to an equivalent spectrum technique. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

Ambient vibration based seismic evaluation of isolated Gülburnu highway bridge     

Ahmet Can Altunişik  Alemdar Bayraktar  Barış Sevim  Şevket Ateş 《Soil Dynamics and Earthquake Engineering》2011

This paper describes ambient vibration based seismic evaluation procedure of an isolated highway bridge. The procedure includes finite element modeling, ambient vibration testing, finite element model updating and time history analysis. Gülburnu Highway Bridge located on the Giresun–Espiye state highway is selected as a case study. Three dimensional finite element model of the bridge is created by SAP2000 software to determine the dynamic characteristics analytically. Since input force is not measured, Operational Modal Analysis is applied to identify dynamic characteristics. Enhanced Frequency Domain Decomposition and Stochastic Subspace Identification methods are used to obtain experimental dynamic characteristics. Analytical and experimental dynamic characteristic are compared with each other and finite element model of the bridge is updated by changing of material properties to reduce the differences between the results. Analytical model of the bridge after model updating is analyzed using 1992 Erzincan earthquake record to determine the seismic behavior. EW, NS and UP components of the ground motion are applied to the bridge at the longitudinal, transverse and vertical directions, respectively. It is demonstrated that the ambient vibration measurements are enough to identify the most significant modes of highway bridges. Maximum differences between the natural frequencies are reduced averagely from 9% to 2% by model updating. It is seen from the earthquake analyses that friction pendulum isolators are very effective in reducing the displacements and internal forces.  相似文献