Shaking table tests on reinforced concrete frames without and with passive control systems     

Mauro Dolce  Donatello Cardone  Felice C. Ponzo  Claudio Valente 《地震工程与结构动力学》2005,34(14):1687-1717

An extensive experimental program of shaking table tests on reduced‐scale structural models was carried out within the activities of the MANSIDE project, for the development of new seismic isolation and energy dissipation devices based on shape memory alloys (SMAs). The aim of the experimental program was to compare the behaviour of structures endowed with innovative SMA‐based devices to the behaviour of conventional structures and of structures endowed with currently used passive control systems. This paper presents a comprehensive overview of the main results of the shaking table tests carried out on the models with and without special braces. Two different types of energy dissipating and re‐centring braces have been considered to enhance the seismic performances of the tested model. They are based on the hysteretic properties of steel elements and on the superelastic properties of SMAs, respectively. The addition of passive control braces in the reinforced concrete frame resulted in significant benefits on the overall seismic behaviour. The seismic intensity producing structural collapse was considerably raised, interstorey drifts and shear forces in columns were drastically reduced. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   

新一代的地震预报专家系统NGESEP中的推理子系统     

王炜  吴耿锋 《地震研究》1998,21(1):33-41

本文介绍了第一代专家系统和第二代专家系统的特点以及新一代地震预报专家系统中的推理子系统。该系统根据地震预报知识的特点设计了推理机,解决了推理子系统中的一系列问题。  相似文献   

Extent, timing, and climatic implications of glacier advances Mount Rainier, Washington, U.S.A., at the pleistocene/holocene transition     

Jane T. Heine   《Quaternary Science Reviews》1998,17(12):1139-1148

The North Atlantic Younger Dryas climatic reversal did not cause a glacier advance on Mount Rainier. The glaciers on Mount Rainier seem to have advanced in response to regional or local shifts in climate. However, the Younger Dryas climatic reversal may have affected the Mount Rainier area, causing a cold, but dry, climate unfavorable to glacier advances. Glaciers in the vicinity of Mount Rainier advanced twice during late glacial/early Holocene time. Radiocarbon dates obtained from lake sediments adjacent to the corresponding moraines are concordant, indicating that the ages for the advances are closely limiting. The first advance occurred before 11,300 ¹⁴C yr BP (13,200 cal yr BP). During the North Atlantic Younger Dryas event, between 11,000 and 10,000 ¹⁴C yr BP (12,900 and 11,600 cal yr BP), glaciers retreated on Mount Rainier, probably due to a lack of available moisture, but conditions may have remained cold. The onset of warmer conditions on Mount Rainier occurred around 10,000 ¹⁴C yr BP (11,600 cal yr BP). Organic sedimentation lasted for at least 700 years before glaciers readvanced between 9800 and 8950 ¹⁴C yr BP (10,900 and 9950 cal yr BP).  相似文献   

设备场境(DC)在Windows GDI中的应用     

李火亘  周家纪 《物探化探计算技术》1998,(1)

Ｃ＋＋对Ｗｉｎｄｏｗｓ图形设备界面（ＧＤＩ）进行了封装,使得Ｗｉｎｄｏｗｓ环境下的图形开发相当快捷,尤其是它提供的几个设备场境类,使得对图形的操纵更加得心应手。  相似文献   

测定一块岩石成岩压力的可能性          下载免费PDF全文

徐嘉谟  陈月娥 《地质科学》1998,33(4):494-501

用一种超低弹性模量(约为0.01MPa)且具有光弹性的软材料铸模的自重卸荷实验证明了固体材料对它的固化压力具有“记忆”的属性。根据成岩地质体在开挖条件下实测位移场特征和用具有“记忆”性能的相似材料所做的开挖模拟实验结果分析,岩石很可能也具有这种属性。这就为测定岩石成岩压力的可能性提供了重要的理论依据。  相似文献   

高层建筑桩筏基础优化设计研究   总被引：7，自引：0，他引：7  

李海峰  陈晓平 《岩土力学》1998,19(3):59-64

将上部结构与地基基础共同作用分析方法和优化设计理论相结合,提出了桩筏基础优化设计模型和实用分析方法。通过抽桩分析,证明了边弱中强和墙柱下强、跨中板下弱的布桩原则是正确的。  相似文献   

便携式水泥灌浆数据记录仪     

周永强  姚振和 《岩土力学》1997,18(4):80-84

介绍一种便携式水泥灌浆数据记录仪的设计原理、框图、软硬件组成及试验结果，并分析了其性能特点。  相似文献   

中国典型城市水资源精测,评价与系统分析     

焦得生  杨景斌 《水文》1996,(6):1-6

选择９个典型城市进行城市水资源精测，评价与系统分析工作。通过精测与调查收集城市水资源本纱，并用城市水平衡方法检验。提出了城市水资源系统的特性，分析了城市用水系统的各项定额与指标，基于大系统理论建立了城市水资源系统模拟模型与优化管理模型，发展了城市淡资源评价方法。具有理论和应用价值。  相似文献   

基于GIS的城市雨水管网优化设计模型研究     

孟令奎  边馥苓  陈晓宁 《武汉大学学报(信息科学版)》1996,(4)

研究了ＧＩＳ技术在城市雨水管网设计中的应用问题，建立了雨水管网设计的相关模型，重点分析了两类直接影响雨水管网工程的计算模型——水力优化计算与指标再优化模型  相似文献   

主存空间对象的索引方法   总被引：1，自引：0，他引：1  

刘东  李琦  承继成 《遥感学报》1996,(4)

空间索引关系到空间数据库和地理信息系统的整体性能。目前，随着计算机主存价格的迅速下降，发展主存空间数据库已经成为可能。主存空间数据库需要相适应的空间索引。本文设计两种面向主存的空间索引──主存网格索引和主存Ｆ_树索引，并对两者的性能进行比较。在多数应用环境下，Ｆ_树空间索引性能更优。  相似文献