多腹板设置下波形钢腹板PC组合箱梁抗扭和应力分析

发布时间：2018-04-30 05:44

本文选题：波形钢腹板 + 组合箱梁　；参考：《兰州交通大学》2015年硕士论文

【摘要】：将折叠式钢板作为箱梁的腹板,从而形成一种新的组合截面,即波形钢腹板PC组合箱梁。这种截面形式能够极大的减轻桥梁本身结构的重量,是一种轻型化的桥梁新形式。但其自身的结构特点使得其本身有一些固有的缺点。以试验梁为基础,建立ANSYS空间有限元模型,对波形钢腹板PC组合箱梁的试验梁和有限元模型值进行对比;针对波形钢腹板PC组合箱梁存在的固有缺点提出结构优化改进的方法。在这种改进下针对腹板厚度,腹板数量及腹板位置对箱梁扭转性能的影响和腹板中剪力分布特点进行有限元模型分析。最后给出腹板厚度、数量和腹板位置对波形钢腹板抗扭性能的影响,以及改进后截面腹板中应力分布特点。主要工作包括以下几个方面:(1)查阅相关文献,了解波形钢腹板PC组合箱梁的一般构造以及目前国内外的研究现状,波形钢腹板的构造特点及相关理论。(2)总结波形钢腹板PC组合箱梁固有的缺点,分析现阶段对于这些缺点进行的处理措施,然后提出改进措施:多腹板设置。(3)由于多腹板设置是一种较特别的单箱多室形式,所以梳理单箱多室箱梁抗扭计算公式,类比单箱单室波形钢腹板计算方法将其引用到波形钢腹板单箱多室截面形式,考察单箱多室波形钢腹板组合箱梁的抗扭性能。通过理论计算可知:相同截面尺寸时单箱单室比单箱多室形式抗扭性能好;外侧腹板剪切应力比内侧腹板大,并随着内侧腹板外移其应力越来越接近外腹板。(4)根据试验梁尺寸,建立有限元模型,和试验梁试验数据对比,优化模型。建立单箱多室波形钢腹板PC组合箱梁模型,然后考虑畸变和翼缘板的影响,用有限元数值分析的方法对理论所得结果进行验证,结果和理论计算一致。(5)建立多腹板设置的波形钢腹板PC组合箱梁模型,从腹板数量,一侧腹板间距两方面考察其对箱梁抗扭性能和腹板剪切应力的影响。有限元分析结果表明:腹板数量和抗扭性能无关;一侧腹板之间的距离增大能够增大箱梁抗扭能力;腹板之间距离很近时,扭转作用下,外侧腹板剪切应力略大于内侧腹板,但整体而言基本相同。多腹板设置比单箱单室抗扭性能好。(6)对有限元模型进行扭转频率分析,结果表明:腹板位置的变化会影响箱梁扭转频率大小。
[Abstract]:The folded steel plate is used as the web of the box girder to form a new composite section, I. E. the corrugated steel web PC composite box girder. This section can greatly reduce the weight of the bridge itself, and it is a new light bridge form. However, its own structural characteristics make it has some inherent shortcomings. Based on the test beam, the ANSYS spatial finite element model is established, and the experimental beam and the finite element model value of the corrugated steel web PC composite box girder are compared, and the structural optimization improvement method is put forward in view of the inherent shortcomings of the corrugated steel web PC composite box girder. The effects of web thickness, web number and web position on the torsional performance of box girder and the shear distribution characteristics in the web are analyzed by finite element model. Finally, the effects of the thickness, quantity and position of the web on the torsional resistance of the corrugated steel web are given, as well as the stress distribution characteristics of the improved web. The main work includes the following aspects: 1) to consult relevant documents to understand the general structure of PC composite box girder with corrugated steel webs and the current research situation at home and abroad. The structural characteristics and related theory of corrugated steel web. 2) summarize the inherent shortcomings of corrugated steel web PC composite box girder, and analyze the measures to deal with these shortcomings at the present stage. Then the improvement measures are put forward: Multi-web setting. 3) since the multi-web setting is a special single-box multi-chamber form, the torsional calculation formula of single-box multi-chamber box girder is combed. Compared with the calculation method of single box and single chamber corrugated steel web plate, the torsional resistance of single box and multi chamber corrugated steel web composite box girder is investigated by introducing it to the form of multi chamber section of single box steel web plate. The theoretical calculation shows that the torsional resistance of single chamber is better than that of single chamber with the same cross section size, the shear stress of the outer web is larger than that of the inner web, and the stress is closer to the outer web with the inner web moving out. (4) according to the size of the test beam, the shear stress of the outer web is larger than that of the inner web. The finite element model is established and compared with the test data of the test beam, and the model is optimized. The model of PC composite box girder with single box and multi-chamber corrugated steel webs is established, and the effect of distortion and flange plate is considered. The theoretical results are verified by finite element numerical analysis. The results are consistent with the theoretical calculation. (5) the model of PC composite box girder with multi-webs is established. The effects of the number of web plates and the spacing of one side web plate on the torsion resistance and shear stress of the box girder are investigated in terms of the number of web plates and the distance between the web plates. The results of finite element analysis show that the number of web plates has nothing to do with the torsion resistance, the shear stress of the outer web is slightly larger than that of the inner web when the distance between the web plates is very close, and the increase of the distance between the web plates can increase the torsion ability of the box girder. But on the whole, it is basically the same. The torsional frequency of the finite element model is analyzed by the method of multi-web setting which is better than that of single box and single chamber. The results show that the change of web position will affect the torsional frequency of box girder.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.216

【参考文献】