某超长剪力墙结构带部分框支的平面有限元分析和侧向刚度研究

文章以某带端部转换高层剪力墙结构为例,进行了多遇地震下不同力学模型的弹性计算和罕遇地震下的弹塑性分析,对转换部位侧向刚度进行对比研究,并对单榀框支转换部位构件进行在竖向恒载和水平地震作用下的平面有限元分析,对其应力分布情况进行了探讨。结果表明,结构整体和转换部位具有较好的承载和变形能力,可供同类工程参考。     

某带穿层柱框架结构的抗震性能分析

文章以某带穿层柱框架结构商业建筑为例,通过对该结构进行多遇地震下的弹性计算和罕遇地震下的弹塑性分析,并结合大震推覆计算分析了结构整体和穿层柱受力性能。分析结果表明,在大震作用下,结构整体及穿层柱具有较好的承载和变形能力,能够达到期望的性能指标。抗震性能分析找出了抗震薄弱构件以指导结构设计,可供类似工程参考。     

某带穿层柱框筒结构的抗震性能分析

文章以合肥某带穿层柱超限高层框架-核心筒结构为例,通过对该结构进行多遇地震下的弹性计算和罕遇地震下的弹塑性整体分析,检验其结构布置合理性和结构的抗震性能,找出抗震薄弱构件。结果表明,结构设计成功解决了结构超限问题,达到了预定的性能目标。     

超限钢筋砼框架体育馆抗震性能分析与设计建议

以太仓某体育馆为背景,利用PKPM、Midas等软件,先对结构进行多遇地震下的弹性分析,指出应采用"切分模型"包络分析等措施保证结构"小震不坏"的设防目标;后根据弹性分析结果进行配筋设计,对实际配筋结构进行罕遇地震下的静力弹塑性分析(Pushover),发现大震下薄弱部位主要位于一层,部分构件出现少量塑性变形,但远未达到倒塌状态,满足规范大震不倒的抗震设防目标.     

极罕遇地震下框剪结构的混合减震控制

为进一步研究极罕遇地震下建筑结构的抗震性能,以框剪结构工程为例,选取7条地震动作为激励,在MIDAS软件中建立三维模型,在考虑性能的抗震设防下,采用粘滞阻尼器和防屈曲耗能支撑(BRB),对非减震结构和减震结构进行弹塑性动力时程分析,对比结构在极罕遇地震下的计算结果,并且研究极罕遇地震下的抗震性能。分析表明:结构层间位移角和层间剪力均有明显降低,减震效果明显,构件性能均有明显的改善,并且满足预期的性能要求。混合消能减震结构在极罕遇地震下有着很好的减震效果,能有效的提高结构整体的抗震性能,改善结构构件的损坏状态,提高结构安全性能。     

罕遇地震作用下钢筋混凝土框架结构韧性评价

为了探究罕遇地震作用下钢筋混凝土框架结构的韧性能力,本研究以钢筋混凝土框架结构为例,利用有限元软件MSC. Marc对其进行动力时程分析,并利用Python提取数据,后处理得到该框架结构在罕遇地震作用下结构构件与非结构构件的损伤状态,以结构的功能损失及恢复时间两个指标对该框架结构进行了韧性评价分析。结果表明:(1)在罕遇地震作用下,该钢筋混凝土框架结构的结构构件和非结构构件都发生了不同程度的破坏,其中底层的梁柱构件破坏最严重,梁完好率为8%,柱的完好率仅为7%。(2)该框架结构对加速度敏感型构件更加友好,在非结构构件中,加速度敏感型完好率高达81. 4%,而位移敏感型仅为39. 2%。(3)以基于损失指数与功能损失为指标的新计算方法定义结构的功能损失,并采用Redi方法计算出非结构构件修复时间为53 d,结构构件的修复时间为19 d。由恢复路径曲线总结出非结构构件对整个钢筋混凝土框架结构的韧性起着决定性作用。     

Y形钢管桁架通廊的弹塑性动力时程分析

以某Y形钢管桁架通廊为研究对象,利用有限元软件MIDAS Gen建立结构计算模型.根据目标反应谱,选取2组天然地震波和1组人工地震波,对Y形钢管桁架通廊在罕遇地震作用下进行三向地震波输入的弹塑性动力时程分析,研究结构的变形和塑性发展程度.结果表明,在罕遇地震作用下,通廊主要构件基本保持弹性,变形满足规范要求,结构能达到预定的抗震性能目标,具有良好的抗震能力.     

城市地铁车站地下结构地震反应

针对地震作用下地铁结构动力学响应的安全问题,基于弹性地基梁理论,利用大型通用有限元计算软件ADINA建立了三层岛式地铁车站结构有限元计算模型,研究地铁的多遇地震与罕遇地震的动力学响应的影响因素,对车站进行了静力分析、谱反应分析以及动力时程分析,总结了地铁结构的地震响应规律.分析结果表明:多遇地震作用下,随着高度的增加地铁车站结构的层间位移随之增大,梁柱连接处的应力较大,楼板跨中节点的应力最小;罕遇地震作用下地铁结构变化有着相似的趋势,但是罕遇地震的位移要远大于多遇地震下的水平位移.     

甘肃省大剧院超限复杂结构弹塑性分析

甘肃省大剧院兼会议中心工程平面选型复杂,出现局部楼层错层、楼板开大洞、局部竖向构件局部转换等,属于特别复杂的高层建筑结构,给结构设计带来了很多新的课题和理念.结合国家抗震规范的要求,对该工程主体结构进行了罕遇地震作用下的弹塑性计算分析,并对工程结构抗震性能进行了分析和综合评价,通过弹塑性分析计算,找出结构潜在的抗震薄弱部位和薄弱构件,并提出相应抗震加强措施,为同类工程设计提供了有价值的参考数据.     

某拟建超限超高层国际广场结构设计及分析

国际广场结构主体高度200.200 m,为钢筋混凝土框架—核心筒结构体系;结构高度B类,结构存在软弱层而竖向不规则。在弹性状态下,运用SATWE对主体结构基本参数进行了计算,重点介绍了结构抗震能力的设计,采用PKPM的EPDAPUSH模块进行push-over推覆分析和罕遇地震下的动力弹塑性时程分析。弹性分析显示结构各项力学指标比较满意,整体计算分析满足规范要求。通过弹塑性时程分析,得出结构具有良好的抵抗地震的能力,能满足预定抵抗地震的要求,并采取技术措施以满足超限审查的要求。     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.