地基不均匀沉降对上部结构内力和变形的影响

应用有限元软件ANSYS研究了地基基础不均匀沉降对上部结构内力和变形的影响．将结构的柱脚和支座简化为固定端，通过在不同的支座处预先施加给定的位移，来模拟分析地基基础不均匀沉降的影响．以深圳市少年宫“水晶石大厅”为例，研究了几种典型情况．分析表明，地基不均匀沉降方式及沉降量的大小对上部结构内力和变形有显著影响，且结构物的柱距直接影响柱的轴力．     

减轻建筑施工中不均匀沉降危害的对策建议

由于地基的非匀质性及上部结构传递荷载的不均匀性，地基普遍存在着不均匀沉降，建筑物的不均匀沉降会引起砌体结构内的附加应力，在墙体局部还会产生应力集中，为探讨地基局部不均匀沉降引起的墙体内部应力情况，本文进行了分析，以揭示不均匀沉降与开裂的规律，并且提出了减轻不均匀沉降危害的对策建议。     

软基上建筑物沉降的有限元数值模拟分析

地基的不均匀沉降会引起墙体开裂,建筑物的倾斜会威胁到结构的安全,因此对建筑物沉降情况的预测分析具有非常重要的现实意义。文章运用地基、基础与结构协同作用的分析方法,对一栋倾斜的建筑物进行ANSYS实体建模分析。通过与理论计算结果相比较,证明该分析方法能很好地分析建筑物的不均匀沉降情况。     

减轻建筑施工中不均匀沉降危害的对策建议

由于地基的非匀质性及上部结构传递荷载的不均匀性,地基普遍存在着不均匀沉降,建筑物的不均匀沉降会引起砌体结构内的附加应力,在墙体局部还会产生应力集中,为探讨地基局部不均匀沉降引起的墙体内部应力情况,本文进行了分析,以揭示不均匀沉降与开裂的规律,并且提出了减轻不均匀沉降危害的对策建议。     

某地下工程上浮原因及处理方案

本文以一个实际地下工程为例,说明当一个建筑物的抗浮系数不满足有关规范要求,且建筑物上的荷载不均匀时,会引起建筑物发生不均匀沉降。一旦沉降变形所引起的次应力加上原结构内力超过承栽力时,建筑物就会发生损伤、破坏现象。因此,必须高度重视地下建筑物的抗浮设计及其施工组织。     

盾构隧道施工对邻近建筑物的影响

为了弄清盾构隧道施工对邻近建筑物的影响,分析了盾构法地铁隧道穿越建筑物时建筑物自身沉降与内力变化状况．以某框架结构办公楼为研究对象,将建筑物和开洞地基看作一个有机整体,利用有限元软件ANSYS10．0建立三维非线性有限元模型,按照结构-土体-隧道共同作用进行了计算分析．分析结果表明,建筑物基础的沉降主要发生在地铁隧道穿越建筑物的区间段内．建筑物的横向倾斜随着盾构的掘进逐渐增大,而其纵向倾斜量最大值则出现在开挖面在建筑物中线附近时;在盾构穿越建筑物的过程中柱子的等效应力增幅可达20．1％;相对于弯矩而言,建筑物构件的扭矩变化更为显著;当开挖面越过建筑物20m时其变形和内力均趋于稳定．     

具有不同节点刚度的装配式框架结构在不均匀沉降下的内力响应分析

装配式框架结构与现浇式框架结构相比,梁柱连接节点较为薄弱,对不均匀沉降引起的附加应力更加敏感;由于装配式框架结构的施工方法不同,导致其梁柱节点连接刚度不同,故在不均匀沉降下进行节点连接刚度对装配式框架结构的稳定性影响研究。按照装配式框架结构的层数和跨数,利用Midas Gen软件建立四种工况模型,将地表不均匀沉降以竖向位移的模式施加于装配式框架结构柱脚上,模拟和对比分析不同节点刚度的装配式框架结构内力变化状态,进而总结分析装配式框架结构的内力系数与层数、跨数的关系,同时推导梁内力系数与节点转动刚度系数的理论关系式。研究表明:在不均匀沉降下,梁柱内力变化与节点连接刚度有关;节点连接刚度影响柱-柱、柱-梁的弯矩传递;在节点连接刚度一定,梁的内力变化与跨数有关,与层数无关;柱的内力变化与跨数有关,在单跨结构中,同时受层数影响;梁端弯矩系数与节点转动刚度系数的关系公式曲线,与模型中拟合的曲线相吻合。     

防止高层建筑基础不均匀沉降的措施

主搂和裙楼的高度差异，使建筑的上部结构荷裁分布不均，致使建筑的基础发生不均匀沉降，从而影响建筑物的适应寿命，正确认识建筑物不均匀沉降的危害，积极采取相应的措施和方法，防止发生该种情况，是本文所要探讨的内容。     

考虑不均匀沉降的大跨网架结构地震反应分析

针对不均匀沉降对大跨网架结构地震反应的不利影响,提出在柱顶设置不同隔震支座以减小不均匀沉降下结构的地震反应.建立大跨网架结构数值模型,进行模态分析,对比其动力特性.耦合不均匀沉降与地震作用,数值分析得到未发生不均匀沉降和发生不均匀沉降的三种结构在水平地震和竖向地震作用下的动力反应.结果表明,不均匀沉降导致结构发生内力重分布,使不同类型的杆件有大小不同的附加应力;不均匀沉降增大了网架结构的地震反应,也降低了隔震效果;三维隔震支座的竖向刚度较小,能够适应不均匀沉降带来的竖向变形,且对竖向地震作用的隔震效果显著,在发生不均匀沉降时仍具有一定隔震效果,而水平隔震支座则没有.     

滨海软土地基不均匀沉降对框剪结构影响的反分析研究

本文以天津滨海新区某一实际工程为例,采用反分析研究地基不均匀沉降对高层框剪结构的影响,即给基础底面一定的位移沉降模式,对基础进行强制不均匀沉降,以此来分析由于地基不均匀沉降产生的上部结构的内力变化规律。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

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

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-