钢-混凝土连续组合梁弯矩调幅系数比较研究

弯矩调幅法作为一种在弹性分析基础上考虑结构内力重分布的简化计算方法,在工程实践中得到了广泛的应用。为此,简述了钢一混凝土连续组合梁三种不同的弯矩调幅系数确定方法,并通过算例比较了不同弯矩调幅系数对组合梁承载力的影响。对组合梁结构优化设计具有参考价值。     

PPC超静定结构弯矩调幅限值及方法的研究

在ＰＰＣ超静定结构弯矩调幅的研究中引入曲斗延性,使得结构满足承载力要求的弯矩调幅限值可以由理论计算求得．在弯矩调幅的取值上,考虑了使用阶段裂缝宽度限值和初铰出现迟早的影响．最后给出了ＰＰＣ超静定结构弯矩调幅的计算公式．     

超静定预应力混凝土结构弯矩调幅取值建议

预应力混凝土结构塑性计算理论与设计方法是理论界和工程界十分关注且较为棘手的问题之一。通过对比国内外混凝土设计规范和各研究机构对超静定预应力混凝土结构考虑塑性内力重分布的弯矩调幅设计建议,讨论相对受压区高度ξ和塑性转角θp对超静定预应力混凝土结构弯矩调幅设计建议的影响。提出合理安全的弯矩调幅设计建议。     

CFRP布加固无粘结预应力连续梁受力性能试验研究

对10根经历了极限荷载的无粘结预应力混凝土连续梁用粘贴CFRP布进行了加固.完成了10根加固梁的试验,考察了平截面假定的适用性、无粘结筋的应力增长情况、加载过程中裂缝的分布与开展、跨中变形的发展、试验梁的破坏特征等.基于试验结果,建立了考虑原梁受荷历程影响的正截面承载力计算方法,提出了以中支座控制截面在极限荷载下的弹性弯矩计算值MLoad与张拉引起的次弯矩Msec之和(MLoad Msec)为调幅对象,以相对塑性转角θp/h0为自变量的调幅系数β的计算公式.     

PPC超静定结构变矩调幅限值及方法的研究

在ＰＰＣ超静定结构变矩周幅的研究中工斗延性,使得结构满足载力要求的弯矩调幅限值可以由理论计算求得,。在弯矩调幅的取值上,考虑了使用阶段裂缝宽度限值和初绞出迟早的影响。     

用混合法求解交叉梁系平板网架与空腹网架结构（之一）

以位移法与弯矩分配法联合求解的交叉梁系平板网架与空腹网架结构,适用于各类边界条件下的正交正放、正交斜放、三向钢网架及钢筋混凝土空腹网架结构的内力分析,且求解简单方便。文中给出了考虑剪切变形时梁的弯矩分配系数,并列出了考虑剪切变形的基本梁元在外力作用下及支座产生单位位移时的杆端弯矩和剪力,以利计算时查用。     

考虑非极限土压力的深基坑桩锚支护结构水平位移计算

针对目前基坑支护技术规程中缺乏桩锚结构实用变形计算方法,以及使用经典土压力计算方法存在缺陷的问题,在考虑非线性共同作用的弹性反力法研究的基础上引入考虑非极限状态的土压力理论,得到一种可同时考虑非极限土压力理论和支护桩与土相互作用的支护桩桩身水平位移计算方法,然后用迭代的方法结合数值解法计算支护桩水平位移,并用Matlab软件编写计算程序,最后采用工程实例对本算法合理性进行对比验证.验证结果表明,采用该方法计算结果与文献中实测结果吻合度较高,从而证明了该计算方法的良好适用性.该方法可为桩锚支护结构的变形计算预测乃至变形控制提供一定的参考.     

预应力型钢混凝土框架试验研究和设计理论

基于两榀预应力型钢混凝土框架的竖向静力试验,对其破坏形态、裂缝的开展与分布、刚度变化、弯矩调幅等特征进行研究.试验结果表明:预应力型钢混凝土框架梁发生类似于钢筋混凝土适筋梁的正截面受弯破坏,属延性破坏,框架梁端形成塑性铰实现了塑性内力重分布,位移延性比大于3,弯矩调幅值为30%左右,弯矩调幅值高于普通预应力混凝土结构.最后分析了次内力产生的本质,提出考虑次内力包括次弯矩、次轴力的预应力型钢混凝土结构的抗弯极限承载力、抗裂度、刚度及最大裂缝宽度计算公式,计算结果与试验数据较吻合.本文计算理论反映了现代预应力设计理论的新思想,为《预应力混凝土结构设计规范》的编制提供依据.     

箱式超大型浮体结构在不规则波中的水弹性响应

箱式超大型浮体结构的水平尺度很大,结构的相对弯曲刚度大大下降,它在海洋环境中的水弹性响应必须考虑。此外,其设计寿命远远超过一般的船舶和海洋工程结构物,从结构设计的角度出发,需要预报结构在整个生命期内可能受到的波浪诱导弯矩以及结构的应力。为此,在应用三维线性水弹性理论计算得到浮体结构动力响应传递函数的基础上,进行了结构动力响应的短期预报和长期预报。计算结果表明,浮体结构的垂向弹性变形与刚体升沉运动幅值相当,波浪诱导弯矩和应力的长期预报值均较大。     

软土复合地基变形模量确定及对结构内力的影响

复合弹性地基的地基变形模量的确定方法进行探讨，以现场试验数据验证了考虑软土处理方法、材料特性而建立的权重法计算模式的合理性.以太浦河大型泵站结构计算为例，分析弹性地基变形模量对结构内力的敏感性，得出结构内力与地基变形模量呈对数递减关系，从而指出软土地基处理后的复合地基变形模量是影响结构内力计算结果的重要因素.     

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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