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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第12卷    第1期    总第63期    2015年2月

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文章编号:1672-7029(2015)01-0119-08
斜交薄壁连续钢箱梁桥设计与受力特性研究
康崇杰1,戴公连12,粟淼1,刘文硕12

(1.中南大学 土木工程学院,湖南 长沙 410075;
2.中南大学 高速铁路建造技术国家工程实验室,湖南 长沙 410075
)

摘 要: 以江苏省丹阳路齐梁路某(30+2×35)m跨线斜交钢箱梁为工程背景,通过比对斜交钢箱梁横隔板布置方式以及支座处隔板布置方式,提出斜交连续梁横向隔板的正交布置方式,得出中间墩支承处采用斜向双隔板布置更有利于结构受力与制造的结论。对箱梁的线型控制、截面总体布置、隔板、纵肋型式、纵肋布置方式和板厚等其他细节进行详细设计。分别建立单梁、空间梁格和板单元有限元模型对桥梁进行受力分析。对3种数值模拟方法计算得出的支座反力、挠度和应力等结果进行分析对比。研究结果表明:单梁法计算结果偏于不安全且无法进行横向计算,梁格法和板单元法均能够对模型进行横向计算,但梁格法计算偏安全,而板单元计算更加细致精确。同时,在同种工况下,斜交钢箱梁钝角区应力值大于锐角区应力值。采用板单元对轮压荷载进行局部分析,表明轮压荷载作用下应力、变形较小。验证了箱梁设计方案的安全合理。

 

关键字: 斜交钢箱梁;数值模拟;单梁法;梁格法;板单元法

Design and mechanical analysis of skew steel box grid
KANG Chongjie1, DAI Gonglian1,2, SU Miao1, LIU Wenshuo1,2

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha 410075, China

Abstract:The (30 plus 2 multiply 35) m steel box grid across railway on Qiliang and Danyang road in Jiangsu Province was cited as an example. The orthogonal layout of diaphragm was proposed. Adopting double diaphragm oblique layout at the intermediate supports was better for structure stress and easier to manufacture. Other design details including the width of flange, cross section width, stiffener shape, stiffener thickness, top and bottom plate thickness were designed. In this paper, Midas Civil 2010 and Ansys were adopted to conduct numerical simulation with three different kinds of numerical simulation methods including a single-beam model, a grillage model and a plate element model. The support reaction, deformation and stress along the longitudinal and transverse direction of the grid were analyzed. The results indicate that the single-beam model tends to be unsafe. The single-beam model can either calculate the transverse distribution principle of reaction, deformation or stress that the other two models could accomplish. Compared with plate element model, employing the grillage model is much safer, but the plate element model can analyze local bearing situation more nuanced. The local analysis of deck under wheel-pressure was also carried out. It shows that the stress and deformation are within the code allowance. The deign proposal was proved to be reasonable and reliable.

 

Key words: skew steel box grid; numerical simulation; single-beam method; grillage method; plate element method

ISSN 1672-7029
CN 43-1423/U

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