某核电站循环水泵房结构的地震反应分析

文中运用动力时程反应分析方法,针对某百万千瓦级核电厂,利用Ansys对循环水泵房结构进行了抗震分析。针对循环水泵房结构场地岩性、结构特点,分别考虑不同设计水位、运行和检修情况、波浪压力、静动水压力和土压力以及地震荷载的组合工况,对结构进行了抗震性能计算分析,得到结构构件各个截面上内力包络,该成果对循环水泵房结构设计具有参考价值和指导意义。     

Seismic performance of wood‐frame houses in south‐western British Columbia

The seismic performance of conventional wood‐frame structures in south‐western British Columbia is analytically investigated through incremental dynamic analysis by utilizing available UBC‐SAWS models, which were calibrated based on experimental test results. To define an adequate target response spectrum that is consistent with information from national seismic hazard maps, record selection/scaling based on the conditional mean spectrum (CMS) is implemented. Furthermore, to reflect complex seismic hazard contributions from different earthquake sources (i.e. crustal events, interface events, and inslab events), we construct CMS for three earthquake types, and use them to select and scale an adequate set of ground motion records for the seismic performance evaluation. We focus on the impacts of adopting different record selection criteria and of using different shear‐wall types (Houses 1–4; in terms of seismic resistance, House 1>House 2>House 3>House 4) on the nonlinear structural response. The results indicate that the record selection procedures have significant influence on the probabilistic relationship between spectral acceleration at the fundamental vibration period and maximum inter‐story drift ratio, highlighting the importance of taking into account response spectral shapes in selecting and scaling ground motion records. Subjected to ground motions corresponding to the return period of 2500 years, House 1 is expected to experience very limited extent of damage; Houses 2 and 3 may be disturbed by minor damage; whereas House 4 may suffer from major damage occasionally. Finally, we develop statistical models of the maximum inter‐story drift ratio conditioned on a seismic intensity level for wood‐frame houses, which is useful for seismic vulnerability assessment. Copyright © 2010 John Wiley & Sons, Ltd.     

损伤地壳中的应力场变化与地震活动

推导了损伤介质中应力场变化与地面位移场和重力变化的关系 ,讨论了利用地面位移和重力场变化来计算地球内应力场变化的边界元方法。利用中国华北地区的 1992～ 1995年的 GPS观测资料对该地区地壳内 15km深处的应力场变化进行了计算 ,并讨论了应力场变化分布与 1996年发生的包头 MS=6 .6级地震的关系 ,结果表明震区的应力场变化明显大于其他地方     

城中村摸查测量项目中存在的若干问题与建议

城中村摸查测量项目是一个集地形测绘、房产测量、附属物清点等内容于一体的综合性工程项目,一般具有工期短、工作量大、投入人员多、外部工作环境复杂等特点,本文详细介绍了此类项目的主要工作内容、工作的重点和难点,并对项目实施过程中的一些常见问题给出了一些有意义的建议.     

基于“房地合一”的多源地楼房数据整理及质量检查方法

为了解决由于“房、地”实行分开登记造成的房产档案归集分散、权属不清、利用不准、错误不断等问题,需要实现“房地合一”管理,而实现“房地合一”的关键就是进行地楼房数据整理。地楼房数据整理主要对多源数据整理,包括产权数据、保障房数据、直管房数据、地籍分幅图、测绘案件数据、二调数据等,整理方法包括地籍分幅图整理、产权数据整理、房产测绘数据整理、直管房和保障房数据整理、地楼房数据关联、数据库建设等。为了提高产权落地数据的准确性,保证数据的质量,对地楼房数据整理成果要进行质量检查,检查方法是先进行总体检查,然后进行细节检查。     

产权产籍数据整理方案中GIS作用的探讨

自2000年以来,房屋产权经历了由纸质到电子,权证关联到统一房屋代码编码关联的过程,系统也由1代升级到2代、甚至3,4代。由于原产权产籍系统关联中缺乏空间位置信息,自然房屋与权属信息可能存在一对多的关系,或多对一的关系,加上一代系统的不成熟性,容易导致权属登记中的产权关联的多种错误。为了能对系统错误的历史数据进行准确整理,并实现在房屋全生命周期中以图管房,图、属、档一体化管理,现就充分利用对图形和属性信息进行科学管理与分析的功能,提出基于房屋全生命周期的综合信息管理体系架构基础上进行数据整理工作的方案。最终在空间数据和非空间数据异化的数据整理及管理的基础上实现数据的高度共享和一致性,为相关主管部门提供一套行之有效的数据整理方案,优化政府部门办公效率、提升公众服务水平。     

Aftershock risk assessment and the decision to open traffic on bridges

Critical issues in emergency management after a seismic event are assessing the functionality of the main infrastructures (hospitals, road network, etc.) and deciding on their usability just after the mainshock. The use of a pure analytical tool to assess the aftershock risk of a structure can be contrasted with the limited time available to make a decision about the usability of a structure. For this reason, this paper presents a method for evaluating post‐earthquake bridge practicability based on a rational combination of information derived from numerical analyses and in situ inspections. In particular, we propose an effective tool to speed up the decision‐making process involved in evaluating the seismic risk of mainshock‐damaged bridges in the context of aftershocks. The risk is calculated by combining the aftershock hazard using the Omori law and the fragility curves of the structure, which are calculated using the regression analysis of a sample of results obtained with data randomly generated by the Latin Hypercube Sampling technique and updated based on the results of in situ inspection. Different decision criteria regarding the practicability of bridges are discussed, and a new criterion is proposed. This tool was applied to an old highway RC viaduct. There are two main findings, including the high sensitivity to Bayesian updating (especially when the damage predicted by numerical analysis does not match the real damage) and the criteria used to decide when re‐open bridges to traffic. Copyright © 2013 John Wiley & Sons, Ltd.     

不动产登记数据的建筑分层分户三维建模关键技术

随着实景三维建设的不断推进,城市管理向立体化、精细化和数字化发展,建筑分层分户三维模型能够承载更详细精准的属性信息,并能叠加倾斜三维模型进行场景渲染,可以更好地服务于城市不动产三维管理、数字赋能社会治理等工作。本文以“萧山区数字赋能社会治理”项目建设为背景,探索和实现了基于不动产登记数据的建筑分层分户三维建模关键技术,形成了从全空间多源异构数据归集至城市全域建筑分层分户三维模型建设的一整套生产技术流程,为城市不动产三维管理、数字赋能社会治理等提供了有效的技术支撑和数据基础。     

基于生成对抗网络的建筑物损毁检测EI北大核心CSCD

建筑物作为自然灾害中最受影响的承灾体之一,其损毁信息的准确提取对灾后应急救援具有十分重要的意义。本文借鉴多模态的思想,提出了一种自动检测损毁建筑物的recursive-generative adversarial networks(RS-GAN)方法,将损毁建筑物检测分为灾前建筑物识别和灾后损毁建筑物检测两个任务,且分别在两个GAN分支中完成。RS-GAN加入联合损失函数将两个GAN分支进行连接,充分利用两个任务之间的潜在互利性提升检测效果。RS-GAN利用第1条GAN分支识别建筑物灾前形状与位置,并将识别结果作为第2条GAN分支的输入进行损毁建筑物检测任务,从而使检测结果具有更清晰的轮廓。该方法为端到端模型,在不需要过多的人工干预情形下,实现了损毁建筑物的自动检测。为了验证RS-GAN模型的效果,在圣罗莎和密苏里两个数据集上进行了测试。试验结果表明,RS-GAN方法拥有更好的检测性能,在圣罗莎数据集上的总体精度和平均精度分别达到了0.90和0.86。     

上海征地房屋补偿新机制及其实施措施

对上海征地房屋补偿政策的发展过程作了概述,介绍了上海以管理主体重构、实施程序优化、补偿争议处置、补偿标准动态调整等为内容的征地房屋补偿新机制的构建及其框架,并对推进实施提出建议。