波形钢腹板PC组合连续箱梁桥的静动力特性分析研究
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摘要
波形钢腹板PC组合箱梁桥是20世纪80年代早期出现的一种新型组合结构桥梁,具有自重轻、预应力效率高、施工周期短、造型美观等诸多优点；同时,其独特的结构形式使结构各组成部分受力明确。波形钢腹板PC组合箱梁桥在法国、日本等国家得到了较广泛的研究和应用,目前,波形钢腹板PC组合箱梁桥在我国同样展现出蓬勃的发展前景,其应用范围正逐步向变截面大跨度梁桥扩展,结构更加复杂。
现有研究主要集中在波形钢腹板的剪切屈曲和抗弯、抗扭以及截面承载力等工作性能上,包括缩尺模型试验和有限元数值分析也多是集中于波纹板梁或该类组合结构简支梁的受力性能,而对该结构在大跨度连续箱梁的静力分析和动力特性研究较少。本文依托一座在建的大跨度波形钢腹板PC组合连续箱梁桥,采用空间有限元方法,主要研究了波形钢腹板PC组合箱梁在大跨度连续梁桥中的空间受力性能,以及结构参数对动力特性的影响。
本文的研究工作表明,波形钢腹板PC组合连续箱梁的自重比一般PC连续箱梁的自重轻20%以上,结构的挠度和应力验算基本满足规范要求；但由于波形钢腹板梁段与混凝土腹板梁段抗弯刚度存在突变,导致抗弯刚度相对较小的波形钢腹板梁段内顶板压应力较大。钢腹板剪应力分布较为均匀,反映出波形钢腹板优良的抗剪能力。
对比两者的动力特性发现,波形钢腹板PC组合连续箱梁扭转振动的频率低于一般PC连续箱梁,增加跨间横隔板可以提高结构扭转振动的自振频率,但频率的提高较为有限。值得注意的是,波形钢腹板PC组合连续箱梁桥扭转振动的自振频率仍然远高于其主频,扭转振动的振动模态主要发生在高阶,表明该结构具有相对较高的抗扭刚度。本文工作可为进一步研究和工程实践参考。
As a new kind of composite bridge, prestressed concrete(PC) composite box-girder bridge with corrugated steel webs appeared in early 1980s. It has a great deal of advantages such as light self-weight, high effective prestressing system, short construction period, beautiful shape, etc. As a unique bridge structure, each part of the box-girder has specific mechanical behavior。It has gained extensive research and application in France and Japan. Now it is getting more rapid development prospects and great application in tapered section of large-span bridges with more complicated structure, in China.
At present, many studies on the PC composite box-girder bridge with corrugated steel webs are mainly concentrated on shear buckling mode of the web, characteristics of bending and torsion, bearing capacity of normal section, etc. Scale model tests and finite element analysis are also more focused on mechanical properties of corrugated plate girder or such beam composite structure, there are very few researches on static and dynamic analysis of long-span continuous box girder in this kind of structure. In thesis, the mechanical properties of space and the structural parameters on dynamic analysis are studied by finite element method based on the PC composite box-girder bridge with corrugated steel webs under construction.
The research shows that the self-weight of PC composite continuous box-girder bridge with corrugated steel webs is about 20%lighter than general PC continuous box-girder bridge, its deflection and stress can meet the norm requirements on limit State. Because of bending stiffness between box-girder with corrugated steel webs and box-girder with Concrete web is the mutation, roof stress of box-girder with corrugated steel webs is relatively large. Steel web shear stress distribution is more uniform, it reflects the corrugated steel web excellent shear capacity.
Comparison of the dynamic performance between PC composite continuous box-girder with corrugated steel webs and other general PC continuous box-girder,it show that torsional vibration frequency of the former is lower than torsional vibration frequency of the latter. Increasing diaphragms can improve the natural frequencies of torsional vibration, but the frequencies of raising are more limited. It is worth noting that natural torsional vibration occurring mainly in high vibration mode, and natural torsional vibration of PC continuous composite box-girder bridge with corrugated steel webs is still much higher than the main frequency of that, it indicating the structure has relatively high capacity of torsional stiffness. This thesis provides references for further research and engineering practice.
现有研究主要集中在波形钢腹板的剪切屈曲和抗弯、抗扭以及截面承载力等工作性能上,包括缩尺模型试验和有限元数值分析也多是集中于波纹板梁或该类组合结构简支梁的受力性能,而对该结构在大跨度连续箱梁的静力分析和动力特性研究较少。本文依托一座在建的大跨度波形钢腹板PC组合连续箱梁桥,采用空间有限元方法,主要研究了波形钢腹板PC组合箱梁在大跨度连续梁桥中的空间受力性能,以及结构参数对动力特性的影响。
本文的研究工作表明,波形钢腹板PC组合连续箱梁的自重比一般PC连续箱梁的自重轻20%以上,结构的挠度和应力验算基本满足规范要求；但由于波形钢腹板梁段与混凝土腹板梁段抗弯刚度存在突变,导致抗弯刚度相对较小的波形钢腹板梁段内顶板压应力较大。钢腹板剪应力分布较为均匀,反映出波形钢腹板优良的抗剪能力。
对比两者的动力特性发现,波形钢腹板PC组合连续箱梁扭转振动的频率低于一般PC连续箱梁,增加跨间横隔板可以提高结构扭转振动的自振频率,但频率的提高较为有限。值得注意的是,波形钢腹板PC组合连续箱梁桥扭转振动的自振频率仍然远高于其主频,扭转振动的振动模态主要发生在高阶,表明该结构具有相对较高的抗扭刚度。本文工作可为进一步研究和工程实践参考。
As a new kind of composite bridge, prestressed concrete(PC) composite box-girder bridge with corrugated steel webs appeared in early 1980s. It has a great deal of advantages such as light self-weight, high effective prestressing system, short construction period, beautiful shape, etc. As a unique bridge structure, each part of the box-girder has specific mechanical behavior。It has gained extensive research and application in France and Japan. Now it is getting more rapid development prospects and great application in tapered section of large-span bridges with more complicated structure, in China.
At present, many studies on the PC composite box-girder bridge with corrugated steel webs are mainly concentrated on shear buckling mode of the web, characteristics of bending and torsion, bearing capacity of normal section, etc. Scale model tests and finite element analysis are also more focused on mechanical properties of corrugated plate girder or such beam composite structure, there are very few researches on static and dynamic analysis of long-span continuous box girder in this kind of structure. In thesis, the mechanical properties of space and the structural parameters on dynamic analysis are studied by finite element method based on the PC composite box-girder bridge with corrugated steel webs under construction.
The research shows that the self-weight of PC composite continuous box-girder bridge with corrugated steel webs is about 20%lighter than general PC continuous box-girder bridge, its deflection and stress can meet the norm requirements on limit State. Because of bending stiffness between box-girder with corrugated steel webs and box-girder with Concrete web is the mutation, roof stress of box-girder with corrugated steel webs is relatively large. Steel web shear stress distribution is more uniform, it reflects the corrugated steel web excellent shear capacity.
Comparison of the dynamic performance between PC composite continuous box-girder with corrugated steel webs and other general PC continuous box-girder,it show that torsional vibration frequency of the former is lower than torsional vibration frequency of the latter. Increasing diaphragms can improve the natural frequencies of torsional vibration, but the frequencies of raising are more limited. It is worth noting that natural torsional vibration occurring mainly in high vibration mode, and natural torsional vibration of PC continuous composite box-girder bridge with corrugated steel webs is still much higher than the main frequency of that, it indicating the structure has relatively high capacity of torsional stiffness. This thesis provides references for further research and engineering practice.
引文
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[18]Y. L. Mo, Chyuan-Hwan Jeng, Y. S. Chang. Torsional Behavior of Prestressed Torsional Behavior of Prestressed Concrete Box-Girder Bridges with Corrugated Steel Webs. ACI Structural Journal,2000,97(6):849-859
[19]R. Luo, B. Edlund. Ultimate Strength of Girders with Trapezoidally Corrugated Webs Under Patch Loading. Thin-Walled Structures, Dec.1996,24:135-156
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[21]刘磊,钱冬生.波纹钢腹板的受力行为[J].铁道学报,2000,5,22(增)：53-56
[22]王福敏,周长晓,张长青.波形钢腹板箱梁承载能力试验研究[J].公路交通技术,2001,2：20-24
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[28]徐岳,朱万勇,杨岳。波形钢腹板PC组合箱梁桥抗弯承载力计算[J].长安大学学报,2005,2(3)：60-64
[29]谭荷瑛,赵艳林.考虑二次效应的体外预应力梁极限抗弯承载力[J].结构工程师,2010.2(1)：14-19
[30]华慧玲,贺玲凤等.基于ANSYS的体外预应力混凝土简支梁分析[J].华北水利水电学院学报,2007.4(2)
[31]M. Rosignoli. Prestressed concrete box girder bridge with folded steel plate webs.strucures and Buildings,1999,2,134:77-85
[32]张兴志.波形钢腹板PC组合连续箱梁桥的施工过程与预应力参数分析.硕士学位论文[D].成都,2009.5
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