碳纤维加固中小型旧桥的加固效果检测

检测评价碳纤维加固中小型旧桥的加固效果往往受到经费和现场情况的限制，不能完全按照旧桥承载力检测方法进行．以某桥碳纤维加固工程为工程实例，根据实际检测结果总结了检测评价碳纤维加固效果较为经济可行的试验方案。     

碳纤维加固桥梁结构技术的应用

碳纤维加固技术是一种新兴的结构加固方法,它采用特种结构用胶将碳纤维材料粘贴在结构构件表现,从而起到对原结构的补强作用,通过对某既有桥采用碳纤维加固处理后的现场试验证实,碳纤维的加固有效提高了桥梁的承载能力,满足了该桥现有的使用功能的需要,碳纤维加固技术日益得到广泛运用,具有极大的使用和推广价值。     

CFRP加固钢筋混凝土T梁桥的荷载试验研究

以佛山市某粘贴碳纤维板加固钢筋混凝土T梁桥为背景,运用MIDAS/Civil 2012有限元软件,按照梁格法建立计算模型,通过对T梁桥粘贴碳纤维板加固后进行的荷载试验,将实测数值与理论计算值进行对比,从而对加固后T梁桥的工作性能进行分析。结果表明,该桥粘贴碳纤维板加固后能满足设计荷载等级要求,有一定的安全储备,为同类型碳纤维板加固钢筋混凝土T梁桥承载能力评价提供参考。     

碳纤维布在熊耳河桥的应用

为了研究碳纤维布侧向粘贴的加固效果,浇注了7根混凝土梁,其中4根侧向粘贴碳纤维布,2根底面粘贴碳纤维布,1根作为对比梁.试验研究表明侧向粘贴碳纤维布加固效果良好.根据试验研究结果,对郑州市熊耳河桥进行了加固,静载试验表明加固效果良好.     

城市立交桥碳纤维加固试验

结合某城市立交桥4号桥梁体的具体病害情况,通过对不同加固方案的比较,提出采用粘贴碳纤维材料法对该桥进行加固.加固后的测试结果表明,采用碳纤维材料对既有桥梁进行加固不但可以有效地提高其承载力,增强其耐久性,且具有快速、经济、适应性广等优点.     

双曲拱桥加固方式研究

某大桥为双曲拱,经检测评定该桥承载能力下降明显,不满足设计和规范要求。为提高公路桥梁通行能力,对其进行了加固处理,经加固方案综合比较,该桥采用改变截面形式方案,通过加固处理完工后,最后进行荷载试验评定了该桥加固效果,发现该桥加固前后结构刚度与强度明显提高。改变截面法加固双曲拱桥的方法切实可行,收到了良好的社会和经济效果。     

碳纤维布约束钢筋混凝土轴心受压柱的力学性能

对碳纤维布约束的钢筋混凝土柱进行了轴压性能试验.研究了混凝土强度、碳纤维布的包裹方式及碳纤维布抗拉强度等因素对约束钢筋混凝土柱的极限承载力及变形等力学性能的影响.试验分析的结果表明,随着混凝土强度的增加,碳纤维布约束加固效果将会降低,碳纤维布强度对其加固效果的影响也逐渐降低;在混凝土强度较低的情况下,采用高强一级碳纤维布加固效果较好;在相同的碳纤维布体积加固率的条件下,采用全包碳纤维布约束混凝土的加固方式比间隔包裹碳纤维布条带效果更好.     

碳纤维布抗剪能力的神经网络预测方法

在碳纤维布加固钢筋混凝土结构中,加固效果要受到被加固结构本身性能、加固材料性能以及荷载情况等因素的影响,因此,加固效果具有极高的非线性。为了预测碳纤维布的加固效果,本文以碳纤维布加固钢筋混凝土梁中碳纤维布的抗剪性能为例,运用神经网络方法,建立了预测碳纤维布抗剪性能的BP神经网络模型。通过预测值与试验值的对比分析,验证了该模型的科学性和合理性。     

预应力CFRP加固混凝土梁的试验研究

为了揭示预应力碳纤维布加固混凝土构件的效果,分别采用普通碳纤维布和预应力碳纤维布对4根钢筋混凝土梁进行抗弯性能试验研究。试验分析了预应力碳纤维布加固混凝土梁的屈服荷载、极限荷载、抗弯刚度等性能指标,并分别比较了预应力碳纤维布与普通碳纤维布、不同预应力水平碳纤维布的破坏形态及加固效果。试验结果表明,采用预应力碳纤维布加固混凝土梁可以充分发挥碳纤维布的高强性能,预应力碳纤维布加固的混凝土梁要比普通碳纤维布加固混凝土梁的承载力、刚度等性能指标都有明显提高,而且预应力水平越大,提高的效果越明显。     

不同湿度环境下碳纤维布(CFRP)加固大理石受弯性能试验

分别对不加固,加固后在在潮湿环境养护和加固后在干燥条件下养护的3组共9根大理石试件进行了受弯试验,通过理论计算与试验结果对比分析,对碳纤维布加固大理石提高抗弯性能进行了初步的研究,试验结果表明,碳纤维布加固大理石的承载力不受干湿环境的影响;碳纤维布加固大理有明显地提高大理石的抗弯性能,具有良好的加固效果。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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