预制预应力混凝土装配整体式框架抗震性能研究

 在介绍一种预制预应力混凝土装配整体式框架结构体系的基本形式及其结构特点的基础上,通过对三个不同键槽长度的预制混凝土框架中节点的低周反复荷载试验研究,并利用面向对象的开放式计算程序OpenSees对一榀两跨三层框架结构进行静力弹塑性分析,研究了这种框架结构体系的抗震性能。试验和理论分析结果表明：框架中节点的滞回曲线丰满,节点耗能能力较强;框架结构的梁铰耗能机制提高了结构整体的耗能能力;经过合理设计的预制框架结构体系具有良好的抗震能力,完全能够满足抗震设防的要求。     

装配整体式UHPC-NC组合框架抗震性能拟静力试验研究

为研究装配整体式超高性能混凝土(Ultra-High Performance Concrete, UHPC)-普通混凝土(Normal Concrete, NC)组合框架的抗震性能,对2榀1/2缩尺的三层两跨框架结构进行了拟静力试验.1榀为装配整体式UHPC-NC组合框架(Precast Concrete Frame, PCF),1榀为全现浇混凝土框架(Reinforced Concrete Frame, RCF).UHPC-NC组合框架采用预制柱、预制U形UHPC梁外壳后浇NC梁芯的叠合梁和节点后浇UHPC制成.研究结果表明：两个框架具有基本相同的破坏过程,PCF的损伤较RCF轻,整体性更好;两个框架的滞回曲线饱满,与RCF相比,PCF的承载能力更高,提高了约16%,PCF的耗能能力高于RCF;PCF的刚度略高,刚度退化稍慢;两个框架的位移延性系数均为3.9～4.6,PCF的位移延性系数更大.装配整体式UHPC-NC组合框架结构的抗震性能优于全现浇框架结构的抗震性能.     

有粘结预应力混凝土和无粘结预应力混凝土扁梁框架拟动力试验研究和有限元分析

通过对一榀有粘结预应力混凝土扁梁框架和一榀无粘结预应力混凝土扁梁框架所进行的拟动力抗震性能试验,分析比较了它们的破坏形态、动力反应、滞回曲线、刚度退化等抗震性能.试验结果表明,无粘结预应力混凝土扁梁框架可以满足抗震要求.此外,还应用有限元分析程序,对预应力扁梁框架进行弹塑性地震反应时程分析,结果证明是可行有效的.     

低周反复荷载下预压装配式预应力混凝土框架抗震性能试验研究

文章通过对一榀预压装配式预应力混凝土框架在低周反复荷载作用下的试验,深入研究了预压装配式预应力混凝土框架的裂缝分布、破坏形态、滞回曲线及位移延性等抗震性能。研究结果表明,预压装配式预应力混凝土框架具有良好的抗震性能。     

不同轴力下再生混凝土框架抗震性能的试验

通过对3榀1∶2比例框架模型（普通混凝土框架1榀,再生粗骨料掺量为100%的再生混凝土框架2榀）在不同的竖向轴压荷载和水平低周反复荷载作用下的抗震性能的对比试验,研究了再生混凝土框架在低周反复荷载作用下的破坏机制、承载力、滞回特性、延性、强度退化、刚度退化和耗能,以及不同轴向力作用对再生混凝土框架抗震性能的影响,并与普通混凝土框架对比分析,对再生混凝土框架结构的整体抗震性能进行评价,从理论上探索再生混凝土和再生混凝土结构的实际应用.试验研究表明,再生混凝土框架具有良好的抗震性能.     

两种混凝土异形柱框架抗震性能试验对比

通过对一榀底层为宽肢的钢筋混凝土异形柱框架与一榀底层为非宽肢的异形柱框架的抗震试验研究,重点对比了两种异形柱框架结构的破坏特征、承载能力、延性、滞回特性、出铰顺序及刚度退化等抗震性能.分析结果表明,底层采用宽肢异形柱后可避免普通异形柱框架结构底层刚度薄弱的不利现象,并能不同程度地改善普通异形柱框架结构的多项抗震性能,提高了异形柱框架结构整体的抗震能力.     

钢筋混凝土异形柱框架试验及静力弹塑性分析

为了研究钢筋混凝土异形柱框架结构的抗震性能，对三榀三层两跨异形柱框架进行了拟静力试验，并采用静力弹塑性分析方法对试验框架进行了理论分析和计算，结果表明这三榀异形柱框架均具备良好的抗震性能．通过对三榀框架之间的对比分析，提出了有益于改善异形柱框架抗震性能的建议．所建立的静力弹塑性分析模型可用于钢筋混凝土异形柱框架的抗震性能评估．     

新型外包钢组合梁框架结构抗震性能试验

为克服普通组合框架结构体系存在的缺点,首次提出新型外包钢混凝土组合梁-型钢混凝土柱组合框架结构体系.设计制作了一榀单跨两层型钢混凝土柱-外包钢混凝土梁的组合框架结构模型,并通过施加恒定竖向荷载和低周反复水平荷载,对模型框架进行了抗震性能试验.试验表明,该榀组合框架在地震时能形成梁铰破坏机制,框架的变形能力、承载能力、延性、耗能能力等均满足延性框架的抗震要求,且模型框架的有效延性系数达到了7.5.新型型钢混凝土组合柱-外包钢混凝土组合梁框架结构的抗震性能优于钢框架结构和钢筋混凝土柱-钢梁框架结构,可在中高层建筑中推广应用.     

柱支撑铰接多层钢框架结构抗震性能分析

迄今为止,对刚接框架的抗震进行了很多研究,但对柱支撑铰接钢框架结构的抗震性能的理论和试验研究却很少.限于试验条件的限制,本文运用AN-SYS程序,通过一榀K型柱支撑铰接钢框架和一榀刚接钢框架在低周反复水平荷载作用下的抗震性能的非线性有限元对比分析,对柱支撑铰接钢框架的     

带开孔梁钢筋混凝土框架拟静力试验研究

用MTS伺服加载系统对两榀带开孔梁钢筋混凝土框架进行低周反复荷载加载试验,对试件的破坏形态、滞回曲线、延性、耗能能力等抗震性能进行初步研究.试验表明,在合理设计的基础上,梁上孔洞的存在并不会影响钢筋混凝土框架结构的抗震性能.     

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.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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