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1.
本文通过对矮塔斜拉桥的构造特点、力学行为的分析以及施工过程中对其线形和工程质量的控制,深化对矮塔斜拉桥的了解,论述了这种桥梁结构型式在桥梁结构设计选择上具有很强的竞争力,具有很好的应用前景。  相似文献   

2.
鉴于大跨度矮塔斜拉桥施工的技术特点,研究关键的施工控制因素。以乌龙江144+288+144m预应力混凝土矮塔刚构斜拉桥施工技术为研究背景,从矮塔施工到斜拉索施工,以及主梁施工的重点施工工序,详细阐述了该桥重点施工技术,施工现场根据文中介绍的方案进行了有效的施工,保障了大桥施工顺利、安全,为类似工程做参考。  相似文献   

3.
目前在大跨度连续梁施工中最常用的施工方法是悬臂梁施工法,由于桥梁施工分段进行,后续梁段的施工可能影响到已施工完毕的梁段的内力和线形产生影响。因此,为了保证大桥顺利合拢及成桥后线形符合设计要求,故需要对大桥进行线性监控,监控数据的获取为今后线性的调整提供了依据。本文结合云南小江特大桥预应力混凝土连续刚构的施工案例,介绍了连续钢构桥线形控制的内容和方法,通过计算各种荷载工况作用下桥梁的挠度,通过实测值与理论值对比,及时调整端头号块的立模标高,从而控制桥梁成桥线形,通过主梁应力监控,保证桥梁结构受力稳定。施工过程中监测点的设置原则,以及监测数据的获取方式为今后类似项目提供了参考。  相似文献   

4.
以新密市溱水路斜拉桥为工程实例,通过建立有限元模型,进行主梁支架施工预拱度的数值模拟和理论分析。结果表明:预拱度计算值与实测值的误差较小,且按此预拱度施工,主梁线形合理,工程效果良好,对类似桥梁预拱度的设计以及施工监测具有一定的指导意义。  相似文献   

5.
针对目前悬臂施工线性控制中容易出现高程波动,超出规范要求的实际施工情况,本文着重从影响桥梁悬臂施工的各系统参数的识别与调整出发,重点研究了影响桥梁悬臂施工挠度最显著的系统参数一砼容重,利用有限元软件分别分析研究了砼理论容重、砼容重提高5%、砼容重提高7.5%、砼容重提高10%、砼容重提高12.5%的几组调整值,得出各组中砼容重对桥梁悬臂施工线性的影响程度,希望对悬臂桥梁施工监控系统参数识别、调整提供借鉴。  相似文献   

6.
鉴于矮塔斜拉桥受力性能的特殊性,引入增量动力分析(IDA)和拉丁超立方体抽样(LHS)评估该结构在地震激励下发生损伤的风险概率。首先采用LHS考虑桥梁构件材料的随机性,与事先选取的地震波相结合形成桥梁-地震动样本集合;其次在确定桥梁有限元模型主要构件损伤指标的基础上采用基于蒙特卡罗(MC)抽样的IDA进行地震易损性分析和地震风险概率评估。为验证方法的正确性和有效性,对一预应力混凝土独塔双索面矮塔斜拉桥结构模型进行地震风险概率评估,结果表明:该方法既充分考虑了材料和地震输入双重随机性又避免了繁琐的积分过程,同时也提高了工程计算的效率及精度。  相似文献   

7.
浙江海盐塘桥工程为一新型的自锚式悬索桥结构.该桥主梁不设纵向预应力钢束,塔顶不设鞍座,主缆、吊杆为钢绞线索,主缆梁端锚固,塔顶张拉.结合海盐塘桥工程的施工控制分析,介绍自锚式悬索桥上部索结构主缆、吊杆的施工工艺和索力控制技术,为同类桥梁的设计和施工提供了参考意义.  相似文献   

8.
桥梁施工的重点内容主要是对其进行监控处理,在保证其可以安全的施工条件下,采用各种施工方式,对相关的数据信息进行计算和整理,构建出施工的模型,提高桥梁成桥的线形质量,让桥梁的受力性能得到一定的保障。本文主要分析的是预应力混凝土连续桥梁挂篮的施工技术,为了能深入的了解到其施工技术对我国桥梁建造事业的影响程度,将我国某一桥梁作为文章的研究重点,通过对该工程状况的研究,不断的改革并创新预应力混凝土连续桥梁挂篮施工技术,为我国日后的桥梁施工提供一定的经验,供以借鉴。  相似文献   

9.
在桥梁施工中,连续刚构施工作为一种山区首选桥型在实际应用中非常广泛。其中,预应力施工工艺又是连续刚构施工过程中很重要的一项技术应用。本文介绍了预应力钢绞线张拉程序及相关的计算方法,结合具体工程实例,进行相关技术分析。为同类工程施工提供借鉴。  相似文献   

10.
通过对一座矮塔斜拉桥施工过程中的应力监测,指出了应力测试中存在误差的影响因素,结合工程实例对误差产生的原因进行了分析.针对实测应力与理论值的差别,得到了一些有益的结论.  相似文献   

11.
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   

12.
《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   

13.
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   

14.
《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   

15.
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   

16.
《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   

17.
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.  相似文献   

18.
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   

19.
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!  相似文献   

20.
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.  相似文献   

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