复合节能轻质墙板轴心受压承载力试验

针对低层民用建筑中的墙板自重大、保温性能差的问题,提出一种集围护、分隔、保温与承重等多种功能于一体的新型复合节能墙板构件—薄壁型钢-保温芯材-薄面板复合节能轻质墙板.通过对4个全比例尺寸的墙板试件在单调静力荷载作用下的轴心受压试验,探讨了对复合节能墙板起决定作用的破坏模式以及墙体轴心荷载极限承载力计算原则.试验结果表明:墙板中薄壁型钢与薄面板通过自攻螺钉连接为一个整体,共同承担竖向轴心荷载.墙板试件中采用2种不同类型的薄壁型钢,最终极限承载力相差可达到60%以上,可见薄壁型钢对墙板轴心荷载极限承载力有较大的影响.研究结果为今后推导复合节能墙体的轴心受压极限承载力的计算模型与计算公式提供了理论依据.     

基于ABAQUS的墙板受压数值模拟

利用ABAQUS建立轴心受压墙板的有限元模型,模拟结果与试验结果吻合较好,论证了模型的正确性和可行性.通过在ABAQUS中建立墙板受压的模型,分析了分布钢筋的直径、混凝土的强度等级和混凝土面层的厚度对墙板轴心受压承载力和最大侧向位移的影响,结果表明:混凝土面层厚度对于承载力影响最大,混凝土强度等级影响次之,钢筋直径的影响最小.     

节能砌块隐形密框墙板偏心受压承载力试验

对4片1/2模型节能砌块隐形密框墙板进行偏心受压试验,分析各试件的破坏过程、协同工作性能、破坏形态及承载力,得出承载力计算公式.研究结果表明,计算结果与试验结果吻合较好,且偏于安全,该公式可用于节能砌块隐形密框墙板的偏心受压承载力计算.随着偏心距的加大,试件由小偏心受压逐渐变为大偏心受压,其破坏荷载逐渐减小,而延性逐渐加大,符合钢筋混凝土构件的破坏规律.密框和砌块间可以很好地协同工作;试件的偏心受压破坏属于材料破坏范畴,不会发生试件平面外纵向弯曲破坏.     

冷弯薄壁方钢管-稻草板组合墙体轴压性能

为研究冷弯薄壁方钢管与纸面稻草板(稻草板)组成的组合墙体的轴压性能,对三面组合墙体试件进行轴心受压试验,得到组合墙体的轴心受压承载力和破坏模式.试验结果表明,组合墙体的破坏模式是钢管端部屈曲破坏、稻草板局部发生褶皱和弯曲.方钢管和稻草板协同工作性能良好,稻草板对方钢管起到了良好的约束作用,组合墙体承载力较高.采用有限元...     

配螺旋箍筋芯柱的钢筋再生混凝土柱性能研究

通过对12根配螺旋箍筋芯柱的钢筋再生混凝土柱分别进行轴心受压试验和偏心受压试验,阐述了主要试验现象及破坏形态,对各试件的承载力、荷载-应变曲线、荷载-位移曲线和荷载-挠度曲线进行了细致分析,结果表明:配螺旋箍筋芯柱的钢筋再生混凝土柱的轴心受压承载力明显低于相同截面尺寸及配筋情况的钢管钢骨再生混凝土柱,说明螺旋箍筋对混凝土的约束作用低于钢管;外围混凝土破坏后,核心区螺旋箍筋芯柱混凝土仍可继续工作,破坏后的混凝土柱仍具有一定的承载能力,在柱核心区配置螺旋箍筋钢筋笼,可提高柱的抗震防倒塌能力;核心区配置螺旋箍筋芯柱可大幅提高柱的偏心受压承载力.     

CFRP强约束混凝土配筋柱稳定性能研究

通过截面经圆弧化处理、外包CFRP后的矩形截面的钢筋混凝土柱的轴心受压试验,研究了长细比对稳定承载力的影响。利用稳定理论中的切线模量和双模量理论,对CFRP强约束混凝土轴心受压柱的稳定性能进行了分析,并与试验结果进行了对比,提出了CFRP强约束混凝土轴心受压柱的长细比限值和相应的稳定承载力计算公式。     

硅酸钙板-纤维增强泡沫混凝土复合墙板的受压性能

以硅酸钙板为面板、纤维增强泡沫混凝土为芯材制备了泡沫混凝土复合墙板,研究了聚丙烯纤维掺量和泡沫混凝土容重对复合墙板受压性能的影响;并通过对受压应力应变曲线回归分析,获得了应力应变曲线方程.结果表明:随芯材中纤维掺量的增大(0~2 kg/m~3),复合墙板受压破坏时芯材的裂缝减少,抗压强度提升了76.08%,受压韧性指数提高了30.03%;随芯材容重的增大(400~600 kg/m~3),复合墙板受压破坏时逐渐从单一破坏转变为整体破坏,抗压强度大幅提高,受压韧性指数增幅较小;复合墙板受压应力应变曲线可分为弹性应变、应力硬化、应变软化和破坏4个阶段,峰值应变随纤维掺量的增加而增加,芯材容重对峰值应变的影响较小;复合墙板在受压条件下会出现界面裂缝和分层现象.     

预制超高性能组合式夹心墙板受压承载力研究

对一种新型预制超高性能组合式夹心保温墙板受压性能进行数值模拟并对现有计算公式进行了改进,采用ABAQUS软件分析了墙板的高厚比、边界条件、面层材料、夹心层材料及连接形式等参数对受压性能的影响,分析结果表明：面层材料对墙板的受压极限承载力影响较大,使用超高性能混凝土(UHPC)的墙板极限承载力较采用C30混凝土的墙板极限承载力平均提升了228%;当墙板厚度一定时,高厚比对墙板的受压极限承载力影响较小,当墙板高度一定时,降低高厚比会显著提升墙板的受压极限承载力;边界条件对墙板的受压极限承载力影响较大,而夹心层材料及连接件形式对墙板受压极限承载力的影响几乎可以忽略。同时拟合了墙板高厚比和稳定系数之间的函数关系,改进了墙板的受压承载力计算公式,为工程实践提供理论参考。     

配筋方钢管混凝土柱的抗压性能

通过配筋方钢管混凝土柱轴压试验及ABAQUS有限元软件对配筋及未配筋方钢管混凝土柱的轴心受压和偏心受压性能进行了非线性数值模拟,研究了2种方钢管混凝土柱在轴心受压和偏心受压下的力学性能、变形能力和破坏形态,给出了2种方钢管混凝土柱数值模拟的荷载-位移曲线和变形形式,分析了配筋对方钢管混凝土柱变形和极限承载力的影响.结果表明:钢管混凝土柱加配筋以后,极限承载能力显著提高,同时变形性能得到一定的改善,但2种方钢管混凝土柱的破坏形态基本相同.随着偏心距的增加,2种钢管混凝土柱的极限承载力和后期的稳定承载力逐渐降低,但配筋钢管混凝土柱的降低幅度比钢管混凝土柱降低幅度小.     

钢-混凝土组合柱轴压性能的试验对比研究

通过对钢-混凝土组合柱的静载轴压承载力试验,得出了各种组合柱在轴心荷载作用下的荷载-纵向位移曲线,分析了组合柱的工作及破坏机理,比较了组合柱的轴压极限承载力并对其轴心受压性能作了试验对比分析,对相关研究和设计具有一定的参考价值.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that