权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of Servo-Hydraulic Earthquake Actuators for use on Geotechnical Centrifuges

开发用于岩土离心机的伺服液压地震执行器

基本信息

批准号：
EP/F036140/1
负责人：
Santana Madabhushi
金额：
$ 11.4万
依托单位：
University of Cambridge
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2008
资助国家：
英国
起止时间：
2008 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FF036140%2F1
关键词：
Development Servo Hydraulic Earthquake Actuators

项目摘要

Earthquakes inflict severe damage to infrastructure. While UK is relatively safe from earthquakes the UK based Construction Industry operates worldwide often performing designs in earthquake prone areas including South-East Asia, Taiwan, Indian sub-continent and other countries. Also the UK based Insurance industry and Risk Management industries often need predictions on the performance of engineered infrastructure. In recent years the use of dynamic centrifuge modelling to investigate various problems in the earthquake geotechnical engineering area has established itself as an attractive tool both to understand the fundamental mechanics at work as well as establishing the performance of a given earthquake resistant design. Worldwide the number of centrifuge centres that are able to carryout earthquake testing on centrifuge models is on the increase with University of California, Davis, RPI in New York and Hong Kong University of Science and Technology upgrading their earthquake actuators and LCPC in Nantes, France and Korean Hydraulic Research Labs recently adding earthquake actuators to their centrifuge facilities. Earthquake modelling on centrifuges started at Cambridge in late 1970's with the famous 'bumpy road' system coming into operation in 1979. In 1994 a Stored Angular Momentum (SAM) based earthquake actuator was developed which could impart strong earthquakes at single tone bursts. This actuator was very successful at Cambridge leading to significant amount of research both fundamental research looking at liquefaction phenomena of soils as well as investigating specific boundary value problems and produced 10 PhD's and significant number of journal and conference publications. The SAM earthquake actuator system though very successful needs to upgraded. The real need in our research capabilities at this time is to have the ability to produce multi-frequency earthquake motions which are a more realisitc representations of the real earthquakes recorded in the field. The analytical ablities in Cambridge have been significantly boosted by the development of Wavelet analyses methods that allow us to analyse multi-frequency inputs in time-frequency space. This ability gives us the distinct advantage to follow the dynamic respone of complex non-linear soil-structure systems. These theorectical developments and the needs of the current research community and the UK based practicising engineers all confluence into the requirement of a servo-hydraulic earthquake actuation system. The medium term aim at Cambridge is to develop a powerful 2-D servo-hydraulic earthquake actuator that is able to generate horizontal and vertical shaking of centrifuge models. However such a system is quite complex and it is considered prudent to approach this development in stages. This is necessary for us to gain experience with fast acting servo-hydraulic valves. This proposal aims to develop a 1-D servo-hydraulic earthquake actuator as the first stage in the development of a 2-D earthquake actuator. This will help us gain the necessary experience in the usage of fast acting servo-valves in the high gravity field, carrying out design and implementation of the appurtant systems such as hydraulic powerpacks, control systems, system safety devices. These systems need to be incorporated into rather specialist requirements of the Cambridge Centrifuge facility which has a limit of 1 ton on the payload (shaking systems + centrifuge model) and the special swing up and lock mechanisms. The project will have a definite deliverable in the form of 1-D earthquake actuator with a shaking force of about 7 tons and will be used in its own right to trigger powerful earthquakes and gives us the ability to model realistic earthquake loading.

地震对基础设施造成严重破坏。虽然英国相对安全，但英国的建筑业在全球范围内运作，经常在地震多发地区进行设计，包括东南亚，台湾，印度次大陆和其他国家。此外，英国的保险业和风险管理业经常需要对工程基础设施的性能进行预测。近年来，使用动态离心模型来研究地震岩土工程领域的各种问题，已经成为一种有吸引力的工具，既可以理解工作中的基本力学，也可以确定给定抗震设计的性能。在世界范围内，能够对离心机模型进行地震测试的离心机中心的数量正在增加，加州大学戴维斯分校、纽约的RPI和香港科技大学升级了其地震致动器，法国南特的LCPC和韩国水力研究实验室最近在其离心机设施中增加了地震致动器。利用离心机进行地震模拟始于20世纪70年代末的剑桥，著名的“颠簸道路”系统于1979年投入使用。1994年，一种基于存储角动量（SAM）的地震致动器被开发出来，它可以在单音调突发中传递强烈地震。这种致动器在剑桥非常成功，导致了大量的研究，包括研究土壤液化现象的基础研究以及调查特定的边界值问题，并产生了10个博士学位和大量的期刊和会议出版物。地对空导弹地震作动器系统虽然非常成功，但仍需升级。我们研究能力的真实的需要是能够产生多频地震运动，这是现场记录的真实的地震的更真实的表示。剑桥的分析能力已经大大提高了小波分析方法的发展，使我们能够分析时频空间中的多频输入。这种能力使我们在跟踪复杂的非线性土-结构系统的动力响应方面具有明显的优势。这些理论的发展和当前的研究界和英国的实践工程师的需求都汇合成一个伺服液压地震驱动系统的要求。剑桥的中期目标是开发一种强大的2-D伺服液压地震致动器，能够产生离心机模型的水平和垂直振动。然而，这一系统相当复杂，因此分阶段进行这一发展被认为是谨慎的。这对于我们获得快速作用伺服液压阀的经验是必要的。本建议旨在开发一个1-D伺服液压地震致动器作为第一阶段的发展，在2-D地震致动器。这将有助于我们获得在高重力领域使用快速作用伺服阀的必要经验，进行设计和实施的附属系统，如液压动力装置，控制系统，系统安全装置。这些系统需要纳入剑桥离心机设施的相当专业的要求中，该设施的有效载荷限制为1吨（摇动系统+离心机模型）和特殊的摆动和锁定机制。该项目将以1-D地震致动器的形式提供明确的可交付成果，其震动力约为7吨，并将自行用于触发强烈地震，并使我们能够模拟真实的地震荷载。