H型钢梁与矩形钢管柱端板单向螺栓连接节点

进行了6组平齐式、外伸式端板单向螺栓连接节点试验,并在现有研究成果的基础上,分别推导了单向螺栓抗拉刚度、受拉端板抗弯刚度、柱壁抗拉刚度、柱壁抗压刚度和受压外伸式端板抗压刚度的计算式.利用组件法推导了平齐式、外伸式连接节点在弯矩作用下初始转动刚度的理论计算公式.结果表明：给出的节点初始转动刚度的计算式与试验结果吻合较好,精度可满足工程设计的要求.最后,提出了H型钢梁与矩形钢管(RHS)柱端板单向螺栓连接节点的设计建议.     

H型钢梁与矩形钢管柱端板单向螺栓连接节点初始转动刚度性能

进行了6组平齐式、外伸式端板单向螺栓连接节点试验,并在现有研究成果的基础上,分别推导了单向螺栓抗拉刚度、受拉端板抗弯刚度、柱壁抗拉刚度、柱壁抗压刚度和受压外伸式端板抗压刚度的计算式.利用组件法推导了平齐式、外伸式连接节点在弯矩作用下初始转动刚度的理论计算公式.结果表明:给出的节点初始转动刚度的计算式与试验结果吻合较好,精度可满足工程设计的要求.最后,提出了H型钢梁与矩形钢管(RHS)柱端板单向螺栓连接节点的设计建议.     

方钢管混凝土柱-钢梁单边螺栓连接节点静力性能有限元分析

针对方钢管混凝土柱-钢梁单边螺栓连接节点,采用ABAQUS有限元软件进行工作机理及参数分析.研究结果表明:该类新型节点具有良好的转动能力和延性;节点抗弯承载力随着轴压比的增大而降低;柱长细比对该类节点弯矩-转角曲线影响较小;增大钢管强度、混凝土强度、柱截面含钢率可有效提高节点力学性能.对于平齐式端板连接,减小外侧螺栓至钢梁翼缘距离及增大连接螺栓数量可提高节点抗弯承载力.     

新型单面螺栓梁柱外伸端板连接节点受力性能试验研究

为研究新型自紧高强单面螺栓SHSOB连接节点的受力性能,并与传统M20扭剪型高强螺栓连接节点进行对比,设计制作了3个方矩形钢管柱与H形钢梁的外伸式端板连接节点试件,包括2个SHSOB螺栓连接节点和1个M20螺栓连接节点,对各节点试件开展了静力加载试验.揭示了节点的受力性能与破坏模式,考察了新型SHSOB螺栓连接节点的转动刚度、承载力和螺栓群受力分布模式.结果表明,SHSOB螺栓连接节点的初始转动刚度低于M20螺栓连接节点,节点转角大于0.03 rad,满足美国规范FEMA-350对节点延性的要求.随着荷载的增加,端板受拉区应力先增大后趋于稳定.SHSOB螺栓连接节点属于半刚性节点,螺栓群受力分布模式与传统的高强螺栓相似,中和轴位于螺栓群形心附近,具有较好的工程适用性.     

波纹腹板H型钢梁柱端板螺栓连接节点抗弯性能

提出了一种波纹腹板H型钢梁与普通H型钢柱采用端板螺栓连接的节点构造.基于高强螺栓抗拉性能的刚性端板模型和T形连接件理论,提出波纹腹板H型钢梁柱端板螺栓连接节点的设计方法.进行了2个波纹腹板H型钢梁柱端板螺栓连接节点的静力试验,并使用商用有限元分析软件ABAQUS建立节点的有限元模型,将设计弯矩下的高强螺栓最大拉力的试验结果与有限元计算结果进行对比,证明了高强螺栓拉力计算公式的可靠性;通过对比设计弯矩和有限元计算的端板屈服弯矩,证明了端板厚度计算公式的合理性.     

一种新型全装配柱座式节点力学性能的数值分析与设计方法

提出一种方钢管柱与H型钢梁连接的柱座式全装配节点，在梁柱交汇处形成节点中心，由法兰盘连接上下柱，由端板连接钢梁。通过改变节点的端板厚度、螺栓直径和法兰盘与加劲板的开孔直径等参数，采用ABAQUS软件对4组节点试件进行了有限元数值分析，在单调加载制度下研究了各节点的极限承载能力与变形破坏模式，分析了参数改变对节点性能的影响；通过对节点进行往复加载获取节点的滞回曲线、骨架曲线，分析其耗能性能、延性性能及刚度退化等抗震性能。研究结果表明：该节点具备良好的抗震性能和耗能能力，端板厚度与螺栓直径对节点承载力有较为显著的影响，节点设计时合理选取参数可在保证节点承载性能的同时，充分发挥其耗能性能以确保梁柱等主要构件不发生塑性破坏。     

螺栓拼接钢梁的抗弯性能

对具有螺栓拼接的H型钢梁进行抗弯性能试验.考虑了拼接板上不同螺栓数量对节点性能的影响,研究了拼接节点的破坏特点、抗弯强度和刚度.研究发现拼接螺栓的初始滑移对节点后续阶段的承载力和刚度产生了明显不利的影响,拼接截面应变分布不再符合平截面假定;相比无拼接H型钢梁,翼缘拼接板受力更大,钢梁挠度更大;翼缘拼接板先于H型钢梁翼缘进入屈服,但是拼接节点的极限弯矩试验值可达到H型钢梁的全截面屈服弯矩的计算值;螺栓滑移后的拼接节点不能简单地按照刚接处理.提出了考虑节点转动刚度影响的H型钢梁挠度计算方法与公式,并得到了试验数据的验证.     

单边螺栓连接圆中空夹层钢管混凝土柱 节点拟静力试验研究

为了获悉中空夹层钢管混凝土柱节点在地震作用下的抗震性能和破坏机理,文章进行了4个圆套圆中空夹层钢管混凝土柱与钢梁单边螺栓端板连接节点的拟静力试验,分析了端板形式和柱截面空心率对此类节点性能和破坏模式的影响;详细观察了节点在低周反复荷载作用下的受力全过程和破坏特征,分析此类节点的滞回曲线、骨架曲线、强度及刚度退化规律、耗能能力等抗震性能指标。试验结果表明:此类端板连接节点具有典型的半刚性特征,连接可靠,耗能效果良好;在相同空心率条件下,外伸端板连接节点的极限承载力、耗能能力要高于平齐端板连接节点;在相同端板形式条件下,节点的极限承载力和耗能能力随着柱截面空心率的增大而减小。研究成果可为我国半刚性中空夹层钢管混凝土结构的设计与应用提供科学依据。     

门式刚架整体式梁柱节点试验研究及有限元分析

对门式刚架整体式梁柱节点进行低周加载试验,并按照现行规范进行常规螺栓端板连接节点足尺试验.结果表明整体式节点较常规节点刚度和承载力均有较大提高,向上承载力提高16.7%,向下承载力提高21.5%.试验也表明螺栓端板连接节点剪切变形大,试件破坏时端板翘起,柱翼缘屈服,过大的梁端位移导致试件失稳,进而失去承载力.相对而言,整体式节点对梁柱有很好的约束作用,减小了梁的变形.     

胶合木端板连接节点低周反复试验与承载力

提出一种适用于胶合木节点的内嵌钢板-端板连接形式.对2个具有不同厚度端板的新型节点及1个常用的内嵌钢板螺栓连接节点进行了低周反复加载试验.结果表明:新型节点的延性以及耗能能力有较大提高,端板厚度是影响新型节点性能的重要因素.对新型节点的屈服荷载,根据虚功原理推导了其计算公式;对新型节点的极限承载力,分析比较了其破坏模式和各模式的承载力计算公式.计算结果与试验结果符合较好.基于上述研究,提出了端板厚度的选取建议.     

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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