共查询到20条相似文献，搜索用时 125 毫秒
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中外电气设备抗震设防标准对比分析 总被引：1，自引：1，他引：0
对比分析国内外电气设备的抗震设防标准,对提高我国电气设备的抗震能力和相关规范的修订具有十分重要的意义。在简要介绍目前美国、日本、IEC系列标准及我国电气设备相关规范的基本情况后,从抗震设防目标、设防水准、抗震设计反应谱等方面对比分析了电气设备抗震设防标准之间的差异,指出了我国相关规范的优缺点。通过借鉴国外电气设备抗震设防标准确定的经验,提出了改进我国电气设备抗震设防及规范修订的建议。 相似文献
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大型桥梁工程的抗震设防标准探讨 总被引：5，自引：1，他引：5
在桥梁工程的抗震设计中,抗震设防标准是必须首先解决的问题。本文探讨了桥梁工程的抗震设防标准决策问题,澄清了最低抗震设防标准和大型桥梁工程抗震设防标准的关系,并基于多级设防的抗震设计思想,探讨了强调设防水准与结构性能要求、验算指标相对应的大型桥梁工程的抗震设防标准。 相似文献
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大型桥梁结构抗震分级设防与安全评安标准 总被引：8，自引：3，他引：5
围绕大型桥梁安全度标准的设置,在综合国内外文献的基础上,对桥梁的重要性分级与设防,桥梁整体安全性评价方法,桥梁安全度标准的确定等三个方面做了评述,在此基础上探讨了桥梁抗震安全标准设置的决策问题。 相似文献
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Requirements for the seismic resistance of nuclear power plants (NPPs) considerably differ from those for of other industrial facilities due to the necessity of protecting not only the NPP itself, but also the environment from radiation hazard. According to special regulations, even if an NPP construction site is located in a region with low seismicity, the NPP design should be based on the maximum design earthquake and peak acceleration typical of the region. Note that seismic warning systems for NPPs differ fundamentally in design and operation principles from conventional seismic monitoring systems. Seismic warning systems are required to reliably detect seismic events threatening the operability of nuclear power plants, to promptly inform operators, and to prevent false alarms and unauthorized access to the system. Atomseismoizyskaniya LLC has developed a seismic warming system (SSZ-1M) and put it into trial operation at the reactor units of the Smolensk NPP in 2014–2015. The system comprises six seismic groups: two groups per each reactor unit. Each group consists of three independent seismic recording channels, the sensors of which are distributed around the reactor unit at a distance of up to 500 m from the latter. Each channel records three components of seismic signals; the acceleration vector is calculated and compared with a preset threshold. Signals exceeding the threshold are fed to a coincidence circuit that generates an alarm if two of the three signals exceed the threshold. This scheme excludes false alarms. The components of the system are characterized by high reliability and stability. The performance of the system channels has been officially certified. The system automatically performs continuous fault diagnosis. The programs responsible for system function and diagnostics are independent; the system units have individual equipment. To exclude the possibility of external impacts, the SSZ-1M warning system has no Internet connection. Special seismic signal simulators were developed to test the operability of the system when deployed. 相似文献
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超大容量地震数据长期在线服务系统是针对数字地震台网海量数据的长期在线服务需求而设计的,软件实现基于文件系统的数据自动存储、快速数据检索、数据格式转换等功能.阐明软件的设计思路和主要功能,介绍软件系统结构和波形数据自动检索方式等. 相似文献
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Meng-Tan Gao 《地震学报(英文版)》1993,6(3):713-719
The models currently used in the seismic evaluation of important projects, microzoning and seismic zonation are all for site.
Although seismic hazard analysis have been done for many sites in seismic zonation and microzoning, relationship among sites
is not considered in the final results. Studies show that it is impossible to get total hazard for specific area from the
results of the hazard analysis of sites. So, when we consider the total seismic hazard of a specific spatial distributed system,
methods for site are not enough. Author discussed the relation and the difference between system hazard and segments hazard
which form the system and proposed a seismic hazard analysis model taking spatial linear distributed series and parallel system
as an example. In aseismic design and earthquake disaster prevention decision, not only the seismic hazard of segments of
the system but also the total seismic hazard of the system should be considered.
The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 347–352, 1993. 相似文献
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A mass reduction concept for seismic hazard mitigation is investigated herein. The proposed method is implemented through floating slabs, ie, slabs that have been seismically isolated from the skeleton of the structure. The investigation is based on time history analyses of MDOF models under scaled strong-motion seismic records complying with an EC8 spectrum. The purpose of these slabs is twofold; for selected short isolation periods, they act as a mass-damping system for the overall response of the structure, employing significantly more mass than traditional TMDs, while for longer isolation periods they provide seismic protection on their contents while effectively reducing the seismic mass of the structure. In the latter case, it is found that the response of the skeleton can be evaluated accurately from a corresponding reduced-mass model. The proposed design method does not necessarily aim at replacing existing seismic design approaches; it rather provides design versatility in the hands of the practicing engineers. 相似文献
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Tuned mass dampers for response control of torsional buildings 总被引：1，自引：0，他引：1
This paper presents an approach for optimum design of tuned mass dampers for response control of torsional building systems subjected to bi‐directional seismic inputs. Four dampers with fourteen distinct design parameters, installed in pairs along two orthogonal directions, are optimally designed. A genetic algorithm is used to search for the optimum parameter values for the four dampers. This approach is quite versatile as it can be used with different design criteria and definitions of seismic inputs. It usually provides a globally optimum solution. Several optimal design criteria, expressed in terms of performance functions that depend on the structural response, are used. Several sets of numerical results for a torsional system excited by random and response spectrum models of seismic inputs are presented to show the effectiveness of the optimum designs in reducing the system response. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
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应用叠层橡胶支座进行基础隔震是目前国内外大力推广的一门建筑抗震新技术。但由于对采用隔震技术后建筑物的工程造价是否会增加缺乏具体的经济技术指标,使得建筑开发商对其推广应用一直持保守态度。选择了位于VIII度区的两个典型工程实例(一例为乙类建筑,另一例为丙类建筑),简要分析了同一建筑物采取不同设计方案(不隔震但抗震设防、隔震使实际设防水平提高、隔震后与未隔震建筑保持相同设防水平等三种不同设计方案)对工程造价的影响及差异。分析数据表明,在同等设防烈度下,基础隔震技术的合理应用可以使被隔震建筑的工程造价与同条件只采用抗震设防的建筑工程造价适当降低。 相似文献
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基于能力谱法的SSI体系抗震pushover分析方法 总被引：1，自引：0，他引：1
本文首先经过2次等效将土与结构相互作用的多自由度体系等效为单自由度体系,并给出了修正反应谱和等价能力谱的确定方法,进而提出了基于能力谱法考虑土与结构动力相互作用(SSI)效应的结构体系pushover分析方法(SSIPA);然后对3种不同高度考虑SSI效应的结构体系在5条地震动作用下采用本文提出的方法进行了算例分析,将结果与非线性时程分析的结果进行了比较,研究了本方法的适用性和准确性;最后,与建筑抗震设计规范的设计反应谱相结合,对9层考虑SSI效应的钢结构用本文提出的方法进行了弹塑性地震反应分析,根据我国抗震设计规范的规定进行抗震性能的评估验证了本方法的可行性。 相似文献
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地震目录数据动态可视化处理服务系统 总被引：1，自引：0，他引：1
为数据共享项目研制和构建了一个具有一定实用价值的动态地震数据处理及可视化服务的系统, 并简要介绍了该系统的网络编程模式选取, 且选择ISAPI模式作为实现服务平台的编程模式。 详细分析了Internet动态服务平台的设计及实现, 包括服务平台编程语言的选取、 系统的运行环境、 后台的数据库支撑及技术流程等。 通过SQL Server数据库存放和管理用于动态可视化服务的地震目录数据和地震序列目录数据。 在数据库中共存放中国强震目录4227条和中国小震目录188033条以及7个地震序列目录共计50072条。 最后, 着重介绍了该服务系统的主要功能, 包括地震目录服务功能和地震序列分析处理功能。 相似文献
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供水系统震害预测专家系统 总被引：6，自引：0，他引：6
本文建立了供水系统震害预测专家系统,把计算分析方法和专家经验相结合,形成了知识库和推理判断。其中,计算方法考虑了管段的地震反应机理和管土相互作用的特征,包括在地震地质灾害场地的管道震害预测方法。经验判断来的于震害数据和专家经验,较全面地考虑了影响管道震害的主要因素。在ＧＩＳ软件平台上形成了专用程序,界面友好,数据交换方便,已应用于实际工程。 相似文献
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Bridges designed following a conventional approach minimize the risk of collapse, but often require challenging, costly, and time-consuming restoration after an earthquake occurs. The new seismic design philosophy requires bridges to maintain functionality even after severe earthquakes. In this context, this paper proposes a controlled rocking pile foundation (CRPF) system and numerically evaluates bridges′ degree of seismic resilience. The CRPF system allows a pile cap to rock on a pile foundation and dissipate seismic energy through inelastic deformations of replaceable bar fuses that connect a pile cap and piles. Following the conceptual design of the CRPF system, two analytical models were developed for a bridge pier utilizing the CRPF system and a pier designed to develop a plastic hinge in its column. The analytical results indicate that, after experiencing a severe earthquake, a conventionally designed bridge pier sustained substantial damage in its column and exhibited significant residual displacement. In contrast, a pier using the CRPF system showed negligible residual displacement and maintained elastic behavior except, as expected, for bar fuses. The damaged fuses can be rapidly replaced to recover bridge seismic resistance following an earthquake. Therefore, the CRPF system helps to achieve the desired post-earthquake performance objectives.
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