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前兆台网历史数据迁移与整合 总被引：1，自引：0，他引：1
长期以来,前兆数据的多系统、多格式、多流程给数据管理和应用带来了很大的复杂性.为此,全国实施了前兆历史数据迁移,将“九五”、模拟和人工观测历史数据迁移到“十五”数据库系统中,并解决了迁移中的代码对应、数据量纲或单位转换、数据衔接、错误纠正、数据库结构差异、数据同步等问题,整合了前兆数据系统,为数据应用带来极大便利,切实提升了前兆数据管理和共享服务能力.本文详细介绍了前兆历史数据迁移的内容、工作流程和工具软件、迁移中的技术难点、取得的成果,以及存在的问题等. 相似文献
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地震前兆数据一直是地震分析预报必不可少的重要数据资源。随着辽宁省地震前兆台站数字化技术改造的开展，地震前兆模拟记录将逐步被数字化记录所取代。我们结合数字化技术改造的实际情况，采用先进的网络关系数据库模型构造了辽宁省数字地震前兆数据库。该数据库直接面向整个地震系统，为地震预报提供详实的数据服务和先进的研究手段。本文对数据库系统、数据库总体设计及数据共享服务也进行了深入研究和讨论。 相似文献
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使用MATLAB获取地震前兆数据库中观测数据 总被引：1，自引：1，他引：0
地震前兆数据库中的观测数据具有极高的科研及应用价值.MATLAB作为具有强大功能的科学计算及分析平台是地震前兆数据分析的得力工具.虽然如此,但MATLAB提供的数据库工具箱并不能完全操控基于ORACLE的前兆数据库.因此,直接通过MATLAB获取前兆观测数据进行后续的前兆统计及分析工作受到了影响.本文首先介绍了主流的数据库访问机制以及在MATLAB中如何实现以这些机制对前兆数据库进行访问并指出了其中的缺陷;然后,给出了通过组件对象模型(COM)的访问方式获取前兆观测数据的方法;最后,给出了使用该方法进行函数封装后,在实际应用中的实例的全部源代码.通过本文提供的方法,台站工作人员或科研人员可以快速、方便的通过MATLAB获取前兆数据库中的相关信息进行科研及日常管理工作. 相似文献
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This paper describes a set of on-site earthquake safety evaluation systems for buildings, which were developed based on a network platform. The system embedded into the quantitative research results which were completed in accordance with the provisions from Post-earthquake Field Works, Part 2: Safety Assessment of Buildings, GB18208.2-2001, and was further developed into an easy-to-use software platform. The system is aimed at allowing engineering professionals, civil engineeing technicists or earthquake-affected victims on site to assess damaged buildings through a network after earthquakes. The authors studied the function structure, process design of the safety evaluation module, and hierarchical analysis algorithm module of the system in depth, and developed the general architecture design, development technology and database design of the system. Technologies such as hierarchical architecture design and Java EE were used in the system development, and My SQL5 was adopted in the database development. The result is a complete evaluation process of information collection, safety evaluation, and output of damage and safety degrees, as well as query and statistical analysis of identified buildings. The system can play a positive role in sharing expert post-earthquake experience and promoting safety evaluation of buildings on a seismic field. 相似文献
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General database for ground water site information 总被引：3，自引：0，他引：3
de Dreuzy JR Bodin J Le Grand H Davy P Boulanger D Battais A Bour O Gouze P Porel G 《Ground water》2006,44(5):743-748
In most cases, analysis and modeling of flow and transport dynamics in ground water systems require long-term, high-quality, and multisource data sets. This paper discusses the structure of a multisite database (the H+ database) developed within the scope of the ERO program (French Environmental Research Observatory, http://www.ore.fr). The database provides an interface between field experimentalists and modelers, which can be used on a daily basis. The database structure enables the storage of a large number of data and data types collected from a given site or multiple-site network. The database is well suited to the integration, backup, and retrieval of data for flow and transport modeling in heterogeneous aquifers. It relies on the definition of standards and uses a templated structure, such that any type of geolocalized data obtained from wells, hydrological stations, and meteorological stations can be handled. New types of platforms other than wells, hydrological stations, and meteorological stations, and new types of experiments and/or parameters could easily be added without modifying the database structure. Thus, we propose that the database structure could be used as a template for designing databases for complex sites. An example application is the H+ database, which gathers data collected from a network of hydrogeological sites associated with the French Environmental Research Observatory. 相似文献
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George C. Manos Stergios A. Mitoulis Anastasios G. Sextos 《Bulletin of Earthquake Engineering》2012,10(3):1029-1047
Seismic design of isolated bridges involves conceptual, preliminary and detailed structural design. However, despite the variety of commercial software currently available for the analysis and design of such systems, conceptual and preliminary design can prove to be a non-straightforward procedure because of the sensitivity of bridge response on the initial decisions made by the designer of the location, number and characteristics of the bearings placed, as well as on a series of broader criteria such as serviceability, target performance level and cost-effectiveness of the various design alternatives. Given the lack of detailed design guidelines to ensure, at this preliminary stage, compliance with the above requirements, a “trial and error” procedure is typically followed in the design office to decide on the most appropriate design scheme in the number and location of the bearing systems; the latter typically based on engineering judgment to balance performance with cost. To this end, the particular research effort aims to develop a decision-making system for the optimal preliminary design of seismically isolated bridges, assumed to respond as single degree of freedom (SDOF) systems. The proposed decision-making process is based on the current design provisions of Eurocode 8, but is complemented by additional criteria set according to expert judgment, laboratory testing and recent research findings, while using a combined cost/performance criterion to select from a database of bearings available on the international market. Software is also developed for the implementation of the system. The paper concludes with the application, and essentially the validation of the methodology and software developed through more rigorous MDOF numerical analysis for the case of a real bridge. 相似文献
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Introduction In recent years, with the development of earthquake observation technology, increasing ofobservation stations and improvement of observation instruments which are digitalized and con-nected by network, a great deal of data is recorded, to some extend, which brings difficulty for usto manage and store them. It leads to traditional methods, which use the file system to managemass data, could not satisfy our requirement, and it is necessary to find a new method in place oftradit… 相似文献
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高层建筑结构的抗震可靠度分析与优化设计 总被引：12，自引：4，他引：12
本文根据我们在文献２中给出的等效随机地震静力作用模型，紧密结合规范和利用我们在文献６中提出的结构体系可靠度分析的最弱失效模式法，提出了结构构件和体系“小震不坏”和“大震不倒”及结构体系在设计基准期内的抗震可靠度分析方法；重新校准了结构构件的目标可靠度指标；综合考虑结构造价和损失期望，提出了结构体系抗震目标可靠度的优化决策方法；分别给出了满足构件抗震目标可靠指标与同时满足构件和体系抗震目标可靠指标的 相似文献
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40g-t水平单向离心振动台总体设计方法研究 总被引：2，自引：0，他引：2
离心机上水平单向振动台振动容量大于30 g-t为大型离心振动台,振动容量40 g-t则代表国际当前大型离心振动台最高水平,目前仅美国和日本各有一台,经验少且自装备后一直不断改进.为满足我国岩土地震工程和土动力学对大型离心振动台装备的迫切需求,本文剖析了40 g-t水平单向离心振动台的功能要求与研制难点,论述了其总体设计... 相似文献
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基于反应谱理论的复模态抗震设计方法 总被引：5，自引：0，他引：5
本文结合我国现行《建筑抗震设计规范》，采用复模态理论分析技术对结构非正交阻尼阵进行解耦，导出了基于反应谱理论的耗能减震结构的复模态抗震设计方法。文中提出了完整、系统的耗能减震结构复模态抗震设计方法的程序，并给出若干抗震设计实例。算例结果表明：该设计方法准确、实用，具有一定的理论意义与工程意义。 相似文献
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利用数据库系统进行地震数据管理和共享服务 总被引：4，自引：0，他引：4
讨论了在数据管理和共享服务中数据库系统相对于文件系统的优越 ,介绍了当今数据库系统的发展现状和方向,并列举了成功应用数据库系统进行数据管理和共享服务的范例,从而论证了地震系统建设分布式数据库系统的必要性。 相似文献
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The accurate evaluation of code torsional provisions for plan-eccentric structures exhibiting inelastic response relies on the adoption of appropriate systems defining both the torsionally balanced (reference) and torsionally unbalanced cases. Whilst a considerable number of analytical studies of this problem have been presented in the literature, inconsistencies have arisen in their conclusions. It is evident from a review of previous studies that one factor contributing significantly to these discrepancies arises in the definition of the structural layout. An issue of particular importance is whether the transverse load-resisting elements oriented perpendicular to the assumed (lateral) direction of earthquake loading should, for purposes of realism, be included in model definitions. Given the diverse approaches in the existing literature, clarification of this issue is required in order to advance the understanding of inelastic torsional response behaviour and to assist the interpretation and comparison of previous studies. This paper aims to provide such clarification, based on analyses of a series of models defined rigorously according to code design provisions. Such models have been subjected to both uni- and bi-directional ground motion input. It is concluded that for the flexible-edge element, accurate estimates of additional ductility demand arising from torsional effects may be obtained from uni-directional models (in which both the transverse elements and the corresponding earthquake component are neglected) only for medium-period to long-period systems. Such estimates may be over-conservative for short-period systems, which constitute a large proportion of systems for which code static torsional provisions are utilized. It is further concluded that models incorporating the transverse elements but analysed under uni-directional lateral loading may underestimate by up to 100% the torsional effects in such systems, but are reasonably accurate for medium- and long-period structures. 相似文献