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1.
型钢混凝土转换梁模板支设系统由于承受荷载大、受力复杂、施工难度大且危险性大导致一些质量安全事故的发生。结合具体工程实例,介绍了将型钢支撑与脚手架支撑结合的型钢混凝土梁的支撑施工技术,并对其进行了安全性分析,取得了良好的经济技术效果,为类似工程的设计与施工提供借鉴与参考。  相似文献   

2.
本文通过转换梁及其下部柱中设与不设型钢骨架两种方案托柱式底层大空间转换层结构模型的对比试验,系统研究了其在垂直荷载和水平荷载作用下的受力性能、位移延性和破坏机制等.结果表明:型钢混凝土转换梁结构具有良好的受力及抗震性能,并提出了有关设计建议.  相似文献   

3.
近年来,在我国高速公路建设中,钢混叠合梁凭借着受力条件好、耐久性佳、用钢量少等诸多特点,在大型互通(几层交汇)及跨高速及城市主干道中得到了广泛应用。文章首先分析了叠合梁的发展应用,具体分析了匝道桥叠合钢箱梁的适用性与技术要点,最后就工程实例对高速公路大跨径匝道桥叠合钢箱梁的制作、拼装施工展开了具体讨论,可供参考。  相似文献   

4.
大跨预应力混凝土连续刚构桥墩梁结合部位受力复杂,且布置数量较多的预应力钢束,是刚构桥中的关键部位。结合昆明市城市三环路东段工程预应力混凝土连续刚构桥的设计方案,利用有限元分析软件ANSYS对墩梁固接区进行精细有限元局部分析,得到施工阶段及运营阶段墩梁固结区的应力分布。结果表明该结构预应力配束合理,施工阶段及运营阶段应力均满足设计规范要求。  相似文献   

5.
工形变截面钢折拱梁由于施工方便、制造简单、受力性能较好而被广泛应用,但钢折拱梁的设计计算有别于普通的等截面简支梁。文章针对工形变截面钢折拱梁,即有拱的受力特性且属于超静定的特点进行受力分析。  相似文献   

6.
预制斜转正桥梁受力特征与设计分析   总被引:1,自引:0,他引:1  
受桥下使用功能影响,斜转正桥梁越来越多的出现在工程实例中,其中预制结构斜转正桥梁通过调整梁长的方式可方便实现桥梁上部角度变化需要,具有技术成熟、施工周期短、不影响交通等优势,但其受力上具有明显不利弯扭效应。采用梁格法建立一典型斜转正桥梁有限元模型,分析其受力特征及产生因素,并结合工程经验阐述了斜转正桥梁相关设计注意事项,可供同行参考。  相似文献   

7.
通过工程实例,介绍运用中国建筑科学研究院编制的结构设计软件PKPM计算预应力混凝土转换梁的方法,绘制了施工图,并讨论了预应力混凝土转换梁施工中应注意的关键问题.  相似文献   

8.
就某高速公路拓宽桥梁新建上部结构混凝土收缩对结构受力的影响进行分析。介绍混凝土收缩的机理、主要原因和影响因素,结合工程实例,建立有限元模型,计算分析混凝土收缩对T形梁结构受力的影响,为拓宽桥梁的优化设计和施工提供理论依据。  相似文献   

9.
本文以三跨预应力混凝土连续槽型梁顶推施工为工程背景,在顶推前对槽型梁进行顶升模拟试验,用以检验顶推过程中导梁与混凝土连接处、槽型梁关键截面的受力是否安全。首先通过Midas/Civil有限元软件建立桥梁模型,对顶推进行全过程施工仿真计算,确定桥梁顶推过程中最不利工况,在此基础上通过顶升加载模拟最不利工况下的梁体受力,通过试验过程中的变形、应力监测,将实测值与理论计算值对比分析,结果表明前导梁、槽型梁具有足够的刚度、强度安全储备,且结构基本处于弹性工作状态,整个顶升试验的顺利实施可为类似顶推桥梁施工提供实践参考。  相似文献   

10.
对永兴阁结构设计进行了受力分析,并介绍了基础设计以及强柱弱梁、强剪弱弯等概念设计在高层建筑设计中的应用.该工程通过采用轻质墙体材料和大直径锥螺纹连接技术等措施.取得了明显的经济效益。  相似文献   

11.
《海外英语》2007,(5):44-45
It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,  相似文献   

12.
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/  相似文献   

13.
《海外英语》2007,(5):10-11
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?  相似文献   

14.
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。  相似文献   

15.
《海外英语》2007,(4):36
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.  相似文献   

16.
王菲 《华章》2007,(12):273-273
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.  相似文献   

17.
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  相似文献   

18.
裴水妹 《华章》2007,(11):196
Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.  相似文献   

19.
20.
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…  相似文献   

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