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Investigation of Composite Truss Bridge

组合桁架桥的研究

基本信息

批准号：
62850081
负责人：
ABE Hidehiko
金额：
$ 3.2万
依托单位：
Utsunomiya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62850081/
关键词：
Composite Structure Bridge Experiment Analysis Shear Connector

项目摘要

The composite plate girder bridges, in which the concrete floor and the steel girder monolithically works, are very popular as bridges of 20 to 50 meters in span length, because they possess good structural characteristics and are economical. Beyond 50 meters in span, however, they are not always economical and the deck type composite truss or inverted arch bridges will be advantageous, instead. But there are only a few composite truss bridges in the world at present and no composite arch bridges can be seen as yet.The present investigation deals mainly with the deck type composite truss bridge through both experiment and analytical computation and is partly extended to the deck type composite inverted arch bridge, the latter being a bridge where a shallow long composite plate girder is strengthened by an inverted steel arch chord attached underneath. In the composite truss bridge the shearing force transferred between the upper steel chord and the concrete floor slab is not distribute … More d so evenly as in the composite plate girder. In the composite arch bridge the upper chord with the floor slab shows a behavior,similar to that of a continuous composite plate girder which are elastically supported by intermediate piers and, furthermore, it is subjected to the axial compression transferred from the arch member underneath, presenting a more complicated structural behavior. For the experiment, three models of parallel chord truss, two of curved chord truss and five of inverted arch, all being. 2.4 meters long in span. They are mainly characterized by the variation in distribution of the shear connectors. The loading points were changed in each specimen, and finally the specimens were statically loaded to fracture. On the other hand, a specific program for electronic computer was developed for the analysis. It consists of three parts. Firstly, the concrete floor and the steel upper chord are divided at the panel points, and the elements of the steel chord and those of the concrete floor are respectively connected by springs. The elements of the steel chord and those of the concrete floor are connected by shearing springs, which correspond to the shear connectors. Secondly, the forces to be introduced to the steel elements of the upper chord are obtained by the plane structural analysis program. Thirdly, the detailed distribution of stresses in the concrete floor was obtained by a plane FEM model, where the forces obtained by the above-mentioned analysis for the upper chord are applied. The experimental results were in fairly good agreement with the analytical results. Many useful findings were obtained from the present investigation, such as the fact that in the case of truss bridge, concentrated arrangement of shear connectors is preferable, while in the case of arch bridge, distributed arrangement is more desirable. Less

组合板梁桥是混凝土楼板与钢梁一体工作的桥梁，由于其具有良好的结构特性和经济效益，在跨度20 - 50米的桥梁中非常受欢迎。然而，跨度超过50米时，它们并不总是经济的，而甲板式组合桁架或倒拱桥将是有利的。但目前世界上只有少数组合桁架桥，还未见到组合拱桥。本研究主要是通过试验和解析计算对桥面型组合桁架桥进行研究，并部分扩展到桥面型组合倒拱桥，后者是一种桥面型组合浅长板梁在桥下加装倒钢拱弦进行加固的桥梁。在组合桁架桥梁中，上部钢索与混凝土楼板之间传递的剪力分布不均匀，比组合板梁更均匀。在组合拱桥中，上弦与楼板表现出类似于由中间桥墩弹性支承的连续组合板梁的行为，而且它还要承受从下面的拱构件传递过来的轴压，表现出更复杂的结构行为。试验采用3种平行弦桁架模型、2种曲弦桁架模型和5种倒拱模型。跨度2.4米。它们的主要特征是剪切连接件分布的变化。改变各试件的加载点，最终使试件静力加载至断裂。另一方面，开发了电子计算机专用程序进行分析。它由三部分组成。首先，在面板点处划分混凝土楼板和钢上部弦线，钢弦线单元和混凝土楼板单元分别通过弹簧连接。钢弦的构件和混凝土楼板的构件通过剪切弹簧连接，这些弹簧对应于剪切连接器。其次，通过平面结构分析程序，得到了上弦钢单元应受的力。第三，采用平面有限元模型计算了混凝土楼板内部应力的详细分布，并将上述分析结果应用于上弦的受力。实验结果与分析结果吻合较好。本研究得出了许多有益的结论，如在桁架桥中，剪力连接件的集中布置较好，而在拱桥中，剪力连接件的分布布置较好。少