浅谈型钢混凝土框架—混凝土核心筒设计

框架—核心筒结构,利用建筑功能的需要在内部组成实体筒作为主要抗侧力构件,在内筒外布置大柱距的框架,具有一定的可利用空间,由于平面的规则性与内部核心筒的稳定性抗侧力作用的空间有效性,其力学性功能优于一般的框架剪力墙结构。是常用的高层结构体系之一。     

框剪结构协同分析的状态空间法

在楼板刚性和连续化假定下,基于并联铁摩辛柯梁模型,引入建筑结构状态变量的概念,导出高层框架-剪力墙结构协同分析的控制微分方程,将方程进行无量纲化,建立框架-剪力墙结构协同分析的状态空间表达式,并采用精细积分法求出其高精度数值解,最终得到框-剪结构协同工作的变形和内力。建立的并联铁摩辛柯梁模型具有通用性,采用的计算方法精度较高,有很强的适用性,可以推广到其他结构的静力和动力计算中。     

框剪结构协同分析的状态空间法

在楼板刚性和连续化假定下，基于并联铁摩辛柯梁模型，引入建筑结构状态变量的概念，导出高层框架-剪力墙结构协同分析的控制微分方程，将方程进行无量纲化，建立框架-剪力墙结构协同分析的状态空间表达式，并采用精细积分法求出其高精度数值解，最终得到框-剪结构协同工作的变形和内力。建立的并联铁摩辛柯梁模型具有通用性，采用的计算方法精度较高，有很强的适用性，可以推广到其他结构的静力和动力计算中。     

框-剪结构考虑剪力墙剪切变形影响的剪力墙合理数量

基于框-剪结构协同工作的连续化分析原理,文章得到了考虑剪力墙剪切变形影响的框-剪结构刚接体系的剪力墙合理数量计算式,并与不考虑剪力墙剪切变形影响的铰接体系和刚接体系的计算式进行比较,分析了它们在确定剪力墙合理数量上的相似和不同。通过算例讨论了框-剪结构的具体剪力墙合理数量值,分析了剪力墙剪切变形和连梁约束刚度对其影响程度,并得出剪力墙的剪切变形对剪力墙合理数量的影响比连梁约束刚度弱;考虑剪力墙剪切变形影响的刚接体系的剪力墙合理数量比不考虑剪力墙剪切变形影响的铰接体系和刚接体系均少,使得结构在安全前提下更加经济合理。     

短肢剪力墙结构简化计算模型

根据短肢剪力墙结构的受力特点,建立了短肢剪力墙结构有限元分析的简化模型--考虑剪切变形的梁模型,并采用这种模型应用有限元分析软件ADINA对一算例进行抗侧刚度分析,与实验结果进行比较,结果表明该模型力学概念清晰,计算简单,而且具有较高的计算精度.     

短肢剪力墙结构简化计算模型

根据短肢剪力墙结构的受力特点，建立了短肢剪力墙结构有限元分析的简化模型——考虑剪切变形的梁模型，并采用这种模型应用有限元分析软件．ADINA对一算例进行抗侧刚度分析，与实验结果进行比较，结果表明该模型力学概念清晰，计并简季，而且具有较高的计算精度。     

带加强层高层建筑结构的主要力学性能研究

高层建筑结构主要采用钢筋混凝土和钢材两种材料,各自有着不同的受力性能和设计特点,从合理经济效益出发,并根据实际情况选用合理的材料,或用钢筋混凝土结构,或用钢结构,或两者结合的混合结构,以达到建造要求。也因为结构体系的多变,高层建筑由开始的框架结构体系、剪力墙结构体系,发展到框架一剪力墙结构体系,并延伸有工程中多见的底部大空间的框支剪力墙结构,再到高度比较高时常用的框架-核心筒或者筒中筒结构,甚至还有超高层建筑采用的多筒结构体系和巨型框架结构体系。此外,由于对建筑结构体型、外观要求的不断变化,特殊的使用需要等等,一些新颖的结构形式也相继出现,例如,板片结构体系,空间交错桁架结构体系,以及斜交网格结构体系等等。     

顶部带水平伸臂的框架—筒体结构连续化分析

利用能量原理和高层结构的连续化分析方法,对顶部带有水平伸臂构件的框架-筒体结构进行了分析,不仅考虑了筒体、水平伸臂而且计入了楼面梁和腹板框架梁、柱对结构内力和变形产生的影响;通过引入相对坐标、伸臂刚度特征值和框架-筒体刚度特征值,得出了结构在水平荷载作用下的侧移和内力计算的解析表达式.算例分析的结果表明:该方法与一般框架-剪力墙结构连续化计算方法得出的筒体内力是一致的,结构顶点侧移是相近的;与有限元分析得出的顶点侧移相差小于7 %.     

关于框架-剪力墙结构自振周期计算的讨论

推导了框架-剪力墙结构自振周期方程,利用两种计算模型,即框架-剪力墙的连续化协同工作计算模型和笔者建立的反映框架-剪力墙结构特点的有限元模型,对比计算结构自振周期系数。两种不同力学模型的计算结果十分吻合,得到相互印证。据此订正了被我国多种有关高层建筑结构设计的教科书、著作广泛引用的关于框架-剪力墙结构自振周期计算的一幅图表存在的问题。     

框-剪结构考虑墙肢剪切变形时剪力墙合理数量

从框架-剪力墙结构协同工作的连续化分析原理出发,建立了在水平荷载作用下考虑剪力墙剪切变形影响时的平衡微分方程．按照我国现行高层建筑混凝土结构技术规程（JGJ3—2002）和建筑抗震设计规范（GB50011—2001）,推导了考虑剪力墙剪切变形影响时满足层间侧移角限值的抗震剪力墙计算公式,并将其与未考虑剪力墙剪切变形影响时的计算公式进行比较,分析了它们在确定剪力墙合理数量上的相似点与不同点．然后引入了各种修正系数,通过图表探讨了剪切变形系数对剪力墙合理数量的影响．最后给出算例,反映出系数对计算结果的影响程度,并分析了引起差异的原因,该方法简单实用,可用于高层建筑结构的初步设计阶段,     

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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