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Through the assimilating and analyzing the construction materials and the design of reinforced concrete arch bridges with long span from both domestic and abroad, the thesis studies the effect of the arch axis geometry, rise-span ratio, arch ring section and spandrel structures, as well as the ultimate bearing capacity and stability of the entire bridge on the design of reinforced concrete arch bridge. In addition, in consideration of construction, the thesis also studies the applicability of different construction methods such as cable crane system, stiffened skeleton system, swing construction system and cantilever construction system and correspoindingly economica spans and their applications of the reinforced concrete arch bridges.

本论文通过对国内外大跨径钢筋混凝土拱桥的设计、施工资料的收集及其出现问题的分析，从设计角度研究了拱轴线形、矢跨比、拱圈截面及拱上构造、全桥极限承载能力及稳定性对钢筋混凝土拱桥设计的影响；从施工角度研究了缆索吊装法、劲性骨架法、转体施工法、悬臂施工法等不同施工方法的钢筋混凝土拱桥的经济适用跨径及其适用条件。

The rolling tide of information and globalization with incomparable power has brought humankind into the span-new 21st century and a span-new era—knowledge economy era.

滚滚而来的信息化与全球化浪潮以无与伦比的巨大力量把人类带进崭新的 21 世纪，带进一个崭新的时代——知识经济时代。

In this article, the author introduces features of urban large-span bridge s, and discusses some problems of urban large-span bridge s, for example, structure selection, position selection, cross section layout, structural safety reservation, construction monitoring, subsidiary facilities, bridge aesthetics and selection of relevant standards and so on.

论述了城市大跨径桥梁的特点，就城市大跨径桥梁设计中的结构选型、桥址的选择、宽桥横断面布置、结构安全储备和施工监控、附属设施的考虑、桥梁美学和有关规范的选用等问题，进行了较深入的探索，并对我国城市大跨径桥梁的设计和建设提出有关建议。

This paper is carried out to analyze the buffeting of long-span steel arch bridge in operation and erection stage. The research is mainly focused on the following aspects: Based on the present AR method, the AIC rule is used for fix the rank of the AR model to improve the simulation precision. Take into account that the wind speed spectrum is vary with the height for the long-span steel arch bridge, simulate the fluctuating wind field.

主要工作有以下几个方面：通过对现有的AR法进行改进，采用最小AIC(A-Information Criterion)准则准确识别模型阶数，提高AR法的计算精度，并考虑大跨度钢拱桥风速谱随高度变化的特点，实现了对三维空间脉动风场的有效模拟。

To meet the challenge of the design for different span projects, the influence of the major parameters on the mechanical behavior at different spans is analyzed in this paper. The variation rule of these parameters with the span is discussed in this paper, which provides thereunder for project designs.

4为满足实际工程中不同跨度的设计需求，本文针对张弦立体桁架结构的主要参数在不同跨度时对结构的受力性能影响情况进行了计算分析，讨论了结构参数和跨度二者之间的变化规律，为工程设计提供了参数选择的依据。

Aiming at the light track traffic project in Tianjin crossing over the Tianjin-Tanggu Highway , because of the lower space, the difficult crossing condition, and overcoming the long steel rail force caused by no attemperator on the seamless railway, the project adopts a 4-span prestressed concrete continuous rigid-frame bridge with span arrangement (42+62+62+42)m.

针对天津轻轨交通项目跨越津塘公路工点低净空、跨越条件困难，以及为克服桥上不能设置无缝线路温度伸缩调节器所带来的长钢轨作用力问题，研究采用了42m＋62m＋62m＋42m四跨预应力混凝土连续刚构桥。

The company offers large-span arch beamless color plate roof installation and construction, the use of color steel imports Shanghai Baosteel, the largest single-span of up to 36 meters.

本公司提供大跨度无梁拱型彩色钢板屋顶安装及施工，采用上海宝钢进口彩色钢板，最大单跨度可达36米。

The results indicated:1 Some cognitive performances decreased obviously with age,such as symbol-digit, visual digit span, auditory digit span,pairedassociation learning,free recall of picture and recognition of meaningless figure But other cognitive performances did not decrease with age, such as picture classific...

结果表明：（1）一些作业（符号数字、视觉数字广度、听觉数字广度、词对联想学习、图象自由回忆和无意图形再认）成绩随年老明显下降，另一些作业（图象分类、卡片分类、心算和矩阵填图）成绩不随年老明显降低；（2）再次验证心算、符号数字、数字鉴别和计数四项非词语性作业速度随年老进行性减慢。

The sofrware STAAD/PRO that calculate a standard beam with 80 m span and large span cable-stayed bridge is used then the coaction problem is analysed in structure.

这种方法不能考虑桥面系中纵、横梁和主桁架间的共同作用问题。对于大跨度桥梁来说，在运

Results: Tyroserleutide can significantly increase the life span of H22 tumor-bearing mice by 50-70% in dosages of 20ug/kg/d-80ug/kg/d,specially the high dosage of 80ug/ml can significantly increase the life span by 69.24%; Tyroserleutide can inhibit the growth of transplanted hepatocellular tumor BEL-7402 in nude mice,the rate of tumor inhibition was25-50% in dosages of 40-320ug/ml ,the inhibition rate of 160ng/ml was 44.03%; Tyroserleutide could inhibit the growth of H22 and BEL-7402 tumor in a dose-dependent manner. Simultaneously, tumoricidal activity of tyroserleutide against BEL-7402 cell line in vitro was observed hinger when compared with the control group(P.05).The inhibition effect of 72hrs was higher than 24hrs,48hrs,96hrs.And specially the high dosage of 160ug/ml can significantly inhibit growth of tumor cell by 19.36%. Tyroserleutide can activated PEM and marked enhance cytotoxicity andphagocytosis functions in vitro and in vivo. The OD values of cytotoxicity were observed hinger when compared with the control group(P.05).The cytotoxicity of macrophages activated by tyroserleutide against BEL-7402 and B16-F10 was 35.58%,61.2% in vitro and21.39%,47.63% in vivo. The cytotoxicity rate of nude mice PEM was 32.86%,73.07% in vivo. Furthermore, tyroserleutide alone could stimulated the production of IL-1B TNF- a and NO by M . Tyroserleutide and LPS could synergistically activated M producing more cytotoxicity effectors. Conclusion: Tyroserleutide had inhibition functions against hepatoma carcinoma .Its possible mechanisms were related to the affect that Tyroserleutide could inhibit tumor cell directively and induce tumor cells apoptosis or death effectively.

结果：酪丝亮肽能显著延长腹水型肝癌H_(22)小鼠的生存时间，给药剂量为80μg／kg／d时疗效最显著，达到69.24％，在20μg／kg／d-80μg／kg／d剂量范围内生命延长率为50-70％，给药剂量与荷瘤鼠生存时间呈现一定量效关系；酪丝亮肽能显著抑制人肝癌BEL-7402移植瘤裸鼠的肿瘤生长，给药剂量为160μg／kg／d时疗效最显著，抑制率为44.03％，并且在40-320μg／kg／d剂量范围内抑制率为25-50％，给药剂量与肿瘤抑制率呈现一定量效关系；酪丝亮肽体外对人肝癌BEL-7402细胞生长有一定的抑制作用，在作用72hrs时各浓度酪丝亮肽对肿瘤细胞的抑制作用较24hrs、48hrs、96hrs明显，其中浓度为100μg／ml时抑制率达19.36％；酪丝亮肽体内外均能增强小鼠腹腔巨噬细胞对肿瘤细胞的杀伤：体外作用中巨噬细胞对BEL-7402、B16-F10的杀伤功能明显增强，与效应细胞对照组相比有显著性差异(P＜0.05)杀伤率分别达到35.58％、61.2％；体内作用中巨噬细胞对BEL-7402、B16-F10的杀伤功能明显增强，与生理盐水对照组相比有显著性差异(P 。05)，杀伤率分别达到21.39%、47.63%；裸鼠腹腔巨噬细胞经酪丝亮肤作用后对BEL一7402、B 16一F10杀伤功能明显增强，与生理盐水对照组相比有显著性差异(P.05)，最高杀伤率分别达到32.86%、73.07%；酪丝亮肤能增强单核巨噬细胞系统的吞噬功能，吞噬指数与生理盐水组比较有显著性差异(P.05)；酪丝亮肤体外作用能促进小鼠腹腔巨噬细胞分泌合成细胞毒效应分子IL一lp、TNF一Q和NO，与效应细胞对照组相比有显著性差异(P.05)；酪丝亮肤体内作用能促进小鼠腹腔巨噬细胞分泌合成细胞毒效应分子IL一lp、TNF一Q和NO，与生理盐水对照组相比有显著性差异(P.05)；酪丝亮肤能促进鼠巨噬细胞株R戌W264.7分泌合成IL一1p和NO，IL一1日、NO水平分别在酪丝亮肤作用24hrs、12hrs时达到高峰，酪丝亮肤单独应用能提高巨噬细胞的分泌合成功能，而且酪丝亮肤能与LPS协同作用刺激巨噬细胞的细胞毒效应分子分泌合成。

Chinese traditional virtue is humility and wariness,the compliment and praise to the others should be declination

中国人的传统美德是谦虚谨慎，对别人的恭维和夸奖应是推辞。如

We bought this house on the never-never.

我们以分期付款的方式买下这座房子。