半刚接钢框架地震响应的有限元程序分析

文章采用有限元分析方法,将半刚性连接节点理想化为弹簧单元,采用Newmark数值积分算法,运用Matlab软件对半刚性连接平面钢框架结构编制了弹性时程分析程序,研究节点刚度对多层钢框架和支撑钢框架结构抗震性能的影响.结果表明,半刚性连接对多层钢框架结构动力性能影响比支撑钢框架结构大.     

预制混凝土梁柱节点试验及框架受力性能分析

提出了一种预制装配式混凝土梁柱节点采用I字型钢连接的节点方式,并进行了该节点在低周反复荷载作用下的试验.针对型钢连接的特征,提出了一种简化的等效十字连接方式用以模拟该节点.结合试验结果以及二维空间撒点,进行了简化节点的等效混凝土弹性模量以及钢筋屈服强度等关键参数的识别,从而可通过数值分析获得预制装配式节点的滞回曲线.根据预制装配式节点的连接方式形成框架结构,同时根据梁柱的配筋形成了现浇框架结构,采用Pushover分析了2种框架的承载力和刚度.利用简化的节点数值模拟滞回曲线进行了预制装配式框架结构在地震动作用下结构整体的受力非线性全过程分析.试验结果表明,该连接方式滞回环较饱满,节点抗震性能良好;数值分析结果表明采用型钢连接节点的预制装配式框架结构与同样梁柱配筋的现浇结构相比承载力和刚度有所提高,此装配式框架结构可满足我国抗震规范对于框架结构在弹性以及弹塑性阶段侧移限值的要求.     

柔性连接填充墙框架结构抗震性能试验

通过5榀空心砌块砌体填充墙框架结构低周反复荷载试验,系统研究了填充墙-框架柔性连接和刚性连接、全墙填充和半墙填充框架结构的破坏机理和抗震性能,进行了结构滞回特性、承载力、位移延性、刚度退化、强度衰减、耗能能力及变形性能指标分析.结果表明,柔性连接方案对结构承载力的提高低于刚性连接方案,但其他性能指标均优于刚性连接方案,说明柔性连接方案减小了墙-框相互作用,有效改善了填充墙框架结构的抗震性能.     

建筑物带基础整体移位模拟及结构受力状态监测参数

以实际工程为例,结合在建建筑物带基础整体移位的工程特点,应用ANSYS workbench建立有限元模型,使用静力分析的方法模拟分析整个结构在顶升移位和平移移位过程中的受力状态.通过分析其变形和应力,发现采用液压悬浮滑移系统可解决该建筑物左右单元质量分布不对称对移位安全影响的问题.分析结果显示,该移位建筑物较大的变形和较大应力发生于筏板基础.通过模拟对比分析,结合工程自身特点,将筏板基础在移位过程中出现较大响应部位的变形、应力和应变作为该结构受力状态监测的参数,这些监测参数可为建筑物移位工程中和就位后安全状态的监测提供参考.     

建筑物整体迁移技术在文物建筑保护中的应用

中国古代文物建筑结构形式主要包括木构架结构、砖木混合结构和其他结构,根据不同结构文物建筑的一般特点和保护要求,提出了整体迁移的关键技术。这些关键技术包括文物建筑的加固技术、托换技术、迁移轨道技术、同步迁移技术和就位连接技术。     

钢支撑加固既有钢筋混凝土结构的方法概述

主要介绍目前建筑结构常用的钢支撑加固方法,并对各种方法的概念、适用范围等进行归纳.总结几种方法在建筑结构加固领域的优势和不足,确保钢支撑与混凝土框架结构之间的可靠连接,是实现钢支撑有效加固钢筋混凝土框架的关键所在.最后介绍国内外对钢支撑加固领域的研究进展和现状,并对加固方法的选择提出一些建议.     

钢筋混凝土框架结构与楼梯构件协同抗震性能研究

目的研究地震中楼梯构件的存在及其布设位置对钢筋混凝土框架结构整体抗震性能、楼梯间周边主体结构构件及楼梯构件自身的受力状态的影响.提出减小楼梯间对框架结构不利影响的设计方法.并对其进行评估.方法通过MIDAS/GEN有限元分析软件进行静力Pushover分析和动力弹塑性时程分析,并与实际震害现象进行了对比.结果楼梯构件能增大结构的抗侧刚度和结构的扭转效应;楼梯间周围主体结构梁柱内力受楼梯构件的影响较大;楼梯构件及与之相连的框架梁柱较早地出现塑性铰;楼梯间布设在结构中部对结构抗震性能影响最大.结论楼梯间对框架结构的刚度分布、框架构件的内力分布有较大的影响,采用滑动支座弱化楼梯间和主体框架结构的连接,能明显减小楼梯构件对框架结构的不利影响.     

基于IDA分析的新型消能摇摆结构抗震性能

针对重大灾害过程中建筑结构的破坏特点,采用增设摇摆刚架的设计方法构建新型消能摇摆结构体系,并利用IDA分析方法对其抗震性能进行系统研究.以已建成的某6层框架结构为研究对象,建立新型消能摇摆结构体系的计算模型.选取ATC-63建议的20条远场地震波作为地震动输入,利用OpenSees软件对该结构体系进行增量动力分析,获得结构体系在不同地震动激励下的动力响应,并结合现行建筑抗震设计规范探讨新型消能摇摆结构体系的抗震性能.结果表明:新型消能摇摆结构体系的变形模式与耗能机制更为合理,其抗震性能优于传统结构体系.     

混凝土收缩徐变及施工过程影响的高层框架结构分析

根据某高层混凝土框架结构的特点,建立了该建筑结构的空间有限元计算模型,考虑混凝土收缩、徐变及施工过程分层加载的影响,对该高层混凝土框架结构在竖向荷载作用下的静力性能进行了分析.计算结果表明:与高层混凝土框架结构整体分析相比,考虑混凝土收缩、徐变和施工过程分层加载影响时,该混凝土框架结构的竖向位移、框架梁轴力增加较多,而框架柱轴力变化不大;框架梁的弯矩、剪力变化不显著,框架柱的弯矩、剪力有一定的变化,这些变化应引起工程设计和施工人员的关注.     

大跨重载钢结构梁柱销轴节点承载性能试验研究

某多层工业厂房为钢框架结构,二层大跨度楼面钢桁架与钢柱连接采用销轴节点.钢桁架上下弦杆及腹杆均采用H型钢截面,弦杆及腹杆通过特定构造形式的节点域采用销轴与柱伸出的耳板连接.为满足工程设计要求,需要确定其承载性能.根据设计要求和有限元分析结果,对该连接节点设计了4组试件进行试验研究,结果表明销轴节点在设计荷载下处于弹性阶段,破坏阶段仍具有良好的延性,承载性能满足设计要求,可为类似工程参考.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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