预应力度对扁梁框架内节点抗震性能影响研究

通过3个不同预应力度的预应力混凝土扁梁框架内节点试件的低周反复荷载加载试验,初步研究了节点的破坏形态、滞回曲线、延性、耗能能力等抗震性能.结果表明,对框架节点影响的本质原因是通过施加预应力在框架结构上,预应力度增大,框架节点的水平承载力随之增大.     

预应力混凝土扁梁框架内节点拟静力试验研究

通过对3个不同轴压比水准的预应力混凝土扁梁框架内节点试件的低周反复荷载加载试验,对试件的破坏形态、滞回曲线、延性、耗能能力等抗震性能进行初步研究,并判定轴压比对预应力混凝土扁梁框架内节点抗震性能的影响规律.试验结果表明,随着轴压比的增大,节点的抗震性能随之下降.     

提高空心板梁桥横向整体性与刚度的方法研究

利用有限元程序MIDASCivil建立了装配式预应力混凝土空心板桥整体计算模型并进行计算,通过对比分析装配式预应力板桥在重做铺装、粘贴钢板和施加横向预应力的荷载横向分布影响线降低幅度、变化趋势,其中,着重分析了施加横向预应力之后的加固效果。有限元模型分析的结果表明,施加横向预应力效果最好,可达到治本效果。     

带可恢复功能节点的装配式框架结构抗震性能

为实现装配式结构震损后能快速修复以恢复使用功能,提出一种带可恢复功能节点的装配式框架结构体系。利用ABAQUS 有限元软件对可恢复功能节点进行数值模拟,探讨可恢复功能节点的作用机理,并将可恢复功能节点布置到装配式框架结构中形成可恢复功能装配式框架结构,考察整体结构的受力机理,可更换耗能铰、装配式节点核心区与梁柱部件的失效演化规律。结果表明,节点的失效主要是由于可恢复功能节点在削弱钢板处的损伤累积引起的断裂导致?与现浇混凝土框架及节点加强型现浇混凝土框架相比,可恢复功能装配式框架的承载能力更高、延性更好,通过可更换耗能铰的塑性变形耗散能量大幅度提高了结构的耗能能力,且结构的损伤破坏集中在削弱钢板上,有效地避免了预制梁柱和节点核心区的损伤。震后通过更换损伤耗能元件即可恢复结构的使用功能,实现了损伤可控和震后功能可恢复的抗震设防理念,具有广泛的应用前景。     

可恢复功能装配式梁柱中柱节点抗震性能研究（英文）

目的:提出一种震后功能可快速恢复的装配式中柱节点,并建立其设计理论;考察装配式中柱节点的抗震性能及震后修复性能,并提出设计建议。创新点:提出一种可快速恢复震后功能的装配式中柱节点;2.提出装配式中柱节点设计理论,并通过数值手段对其合理性进行校核;3.试验研究考察基础试件的抗震性能及震后修复性能。方法:1.通过理论分析手段建立装配式中柱节点设计理论;2.利用数值模拟手段通过4组8个算例来验证节点设计理论,并对节点抗震性能进行数值研究;3.对基础试件进行低周往复荷载试验研究及修复试验研究,进一步验证设计理论的合理性,并考察节点的抗震性能及震后修复性能。结论:1.提出的设计理论可准确地预测装配式中柱节点的屈服荷载;2.设计合理的装配式中柱节点具有良好的承载性能及滞回特性,可满足结构震后功能修复要求;3.翼缘连接盖板厚度和材性、中间螺栓间距和梁段间隙参数对节点抗震性能影响较大,需合理设置。     

装配式楼盖裂缝的机理分析及对策

通过对混凝土变形机理的分析,对预应力空心板的设计、制作及施工各个阶段提出了应采取的措施,以减少或消除装配式楼盖中的裂缝。     

新工科背景下《混凝土结构设计》实验设计与教学实践研究

在新工科建设和我国建筑工业化进程不断推进的大背景下,《混凝土结构设计》课程试验急需重大变革。文章从提出增加与装配式建筑设计理论、计算、施工、安装相关的内容出发,建立装配式结构虚拟仿真试验平台,并提出增设装配式构件组装与节点连接的课程试验内容的三点改革措施。     

预应力混凝土T梁桥体外预应力加固技术研究

目前体外预应力法加固装配式预应力简支T梁桥,主要受限于设计理念、转向装置、锚固系统还未达到成熟应用的水平.本文基于实例工程,研究了体外束布束方式对结构性能的提升效果,对预应力加固体系中的转向装置进行了细部应力分析,验证了所提出构造的合理性,并通过实桥加固后静载试验证明了体外预应力加固法的效果.     

BIM技术在老年公寓PC建筑施工中的应用

对BIM技术的特点和预制装配式混凝土结构（PC建筑）施工特点进行了研究,阐述了在预制装配式混凝土结构施工中应用BIM技术的必要性;以龙信老年公寓预制装配式混凝土结构施工为例,研究了BIM技术在该项目施工中应用的技术路线及其应用效果,以期为BIM技术在预制装配式混凝土结构中的应用提供借鉴。     

F·莱翁哈特《大学圬工结构讲义》评介

弗利茨·莱翁哈特(Fritz Leonhardt)是联邦德国钢筋混凝土界的知名学者。在五十年代到七十年代的三十年中,他在联邦德国的钢筋混凝土和预应力混凝土的设计、施工、科学研究和教学等几个领域中都做出了令人信服的重大贡献。早在五十年代,他就通过《预应力混凝土》一书全面反映了联邦德国当时处于世界领先地位的预应力技术和理论研究成果,从而受到世界各国的重视。随后又在主持钢筋混凝土及预应力混凝土构件抗剪性能和深梁受力性能的研究工作中取得了各国同行瞩目的重要成果。在这三十年中,他还亲     

汉字倒说

汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

钱生钱!

我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了     

Inequalities for inscribed simplexes

The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

微薄的薪水,高尚的情操

现在,我们可以没有面包,没有钱,没有房子,没有车子……但我们唯独不能丢失的是高尚的情操,笃定的信念,还有,满满的希望!     

Virtual reality approach for 3D large model browsing on web site

Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching.