大跨活性粉末混凝土混合梁斜拉桥的方案设计及性能分析
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摘要
为探讨活性粉末混凝土RPC在混合梁斜拉桥中应用的可行性,以一座主跨260 m钢+C55普通混凝土混合主梁的独塔双索面混合梁斜拉桥设计方案为基础,考虑结构整体和局部受力及稳定性等要求,将原桥钢主梁替换成RPC120主梁,构造了一座类似布置形式的RPC120+C55混合主梁斜拉桥方案,并对两种方案的结构静、动力性能和稳定性能及经济性能进行了分析和比较。结果表明:从结构受力性能角度而言,采用RPC+C55混合主梁所构成的混合梁斜拉桥结构体系具有良好的结构受力性能,加之同为水泥基材料的普通混凝土与RPC之间良好的相容性,使得梁内无需设置构造复杂的结合段。所提结构体系在结构受力、构造及经济指标上均具备实际应用的可行性。
To investigate the applicability of reactive powder concrete( RPC) in cable-stayed bridge with hybrid girders,based on a cable-stayed bridge of 260 m long main span with a hybrid girder by steel and C55 normal concrete,a new cable-stayed bridge system of the same span layout with RPC120 substituting for steel in the girder,was designed considering the structural stiffness,stress and stability. The comparative study on the static,dynamic and stability properties as well as the economic performance of these two bridges were carried out. The results show that the new cable-stayed bridge structure has an expected mechanical performance,additionally,the better compatibility between the ordinary concrete and RPC both of cementitious materials results in that the complicated joint as in the steel-concrete hybrid girder could be avoided,which makes the new structure be of feasibility in practice due to its excellent loading performance and simpler construction requirements.
To investigate the applicability of reactive powder concrete( RPC) in cable-stayed bridge with hybrid girders,based on a cable-stayed bridge of 260 m long main span with a hybrid girder by steel and C55 normal concrete,a new cable-stayed bridge system of the same span layout with RPC120 substituting for steel in the girder,was designed considering the structural stiffness,stress and stability. The comparative study on the static,dynamic and stability properties as well as the economic performance of these two bridges were carried out. The results show that the new cable-stayed bridge structure has an expected mechanical performance,additionally,the better compatibility between the ordinary concrete and RPC both of cementitious materials results in that the complicated joint as in the steel-concrete hybrid girder could be avoided,which makes the new structure be of feasibility in practice due to its excellent loading performance and simpler construction requirements.
引文
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[2] Dugat J,Roux N,Bernier G. Mechanical properties of reactive powder concrete[J]. Materials and Structures,1996,29(4):233-240.
[3]李莉,王英,郑文忠.活性粉末混凝土耐久性综述[J].工业建筑,2008,38(s1):773-776.
[4]李昊阳.活性粉末混凝土收缩徐变效应试验研究[D].北京:北京交通大学,2016.
[5]郑文忠,吕雪源.活性粉末混凝土研究进展[J].建筑结构学报,2015,36(10):44-58.
[6] GB/T 31387-2015,活性粉末混凝土[S].
[7] DBJ43/T 325-2017,活性粉末混凝土结构技术规程[S].
[8] Blais P Y,Couture M. Precast,prestressed pedestrian bridge-world’s first reactive powder concrete structure[J]. PCI Journal,1999,40(5):60-71.
[9] Behloul B,Lee K C. Ductalseonyu footbridge[J].Structure Concrete,2003,4(4):195-201.
[10] Graybeal B. UHPC in the US Highway Transporta-tion System:Proceedings of the Second Internatio-nal Symposium on Ultra High Performance Concr-ete[C]//Kassel:Kassel University Press,2008.
[11]曹万会,高淑平. RPC混凝土在铁路预应力T形梁中的应用试验[J].铁道建筑技术,2009,(7):105-108.
[12]杜任远,黄卿维,陈宝春.活性粉末混凝土桥梁应用与研究[J].世界桥梁,2013,41(1):69-74.
[13]郭敏. RPC拱结构体系及其力学行为的研究[D].北京:北京交通大学,2008.
[14]任亮.基于高性能材料的千米级跨径混凝土斜拉桥力学性能研究[D].长沙:湖南大学,2013.
[15]卢祖梁.大跨活性粉末混凝土混合梁连续刚构桥的结构性能[D].长沙:湖南大学,2015.
[16] Kim H S,Kim Y J,Chin W J,et al. Development of optimal structural system for hybrid cable-stayed bridges using ultra high performance concrete[J]. Engineering,2013,5:720-728.
[17] Yoon H,Chin W J,Kim H S,et al. Conceptual design of hybrid cable-stayed bridge with central span of1000 m using UHPC[J]. Engineering,2013,5:744-750.
[18] JTG D64-2015,公路钢结构桥梁设计规范[S].
[19] JTG D62-2004,公路钢筋混凝土及预应力混凝土桥涵设计规范[S].
[20] GB 50010-2010,混凝土结构设计规范[S].
[21] JTG D60-2004,公路桥涵设计通用规范[S].
[22] JTG/T D65-01—2007,公路斜拉桥设计规范细则[S].
[2] Dugat J,Roux N,Bernier G. Mechanical properties of reactive powder concrete[J]. Materials and Structures,1996,29(4):233-240.
[3]李莉,王英,郑文忠.活性粉末混凝土耐久性综述[J].工业建筑,2008,38(s1):773-776.
[4]李昊阳.活性粉末混凝土收缩徐变效应试验研究[D].北京:北京交通大学,2016.
[5]郑文忠,吕雪源.活性粉末混凝土研究进展[J].建筑结构学报,2015,36(10):44-58.
[6] GB/T 31387-2015,活性粉末混凝土[S].
[7] DBJ43/T 325-2017,活性粉末混凝土结构技术规程[S].
[8] Blais P Y,Couture M. Precast,prestressed pedestrian bridge-world’s first reactive powder concrete structure[J]. PCI Journal,1999,40(5):60-71.
[9] Behloul B,Lee K C. Ductalseonyu footbridge[J].Structure Concrete,2003,4(4):195-201.
[10] Graybeal B. UHPC in the US Highway Transporta-tion System:Proceedings of the Second Internatio-nal Symposium on Ultra High Performance Concr-ete[C]//Kassel:Kassel University Press,2008.
[11]曹万会,高淑平. RPC混凝土在铁路预应力T形梁中的应用试验[J].铁道建筑技术,2009,(7):105-108.
[12]杜任远,黄卿维,陈宝春.活性粉末混凝土桥梁应用与研究[J].世界桥梁,2013,41(1):69-74.
[13]郭敏. RPC拱结构体系及其力学行为的研究[D].北京:北京交通大学,2008.
[14]任亮.基于高性能材料的千米级跨径混凝土斜拉桥力学性能研究[D].长沙:湖南大学,2013.
[15]卢祖梁.大跨活性粉末混凝土混合梁连续刚构桥的结构性能[D].长沙:湖南大学,2015.
[16] Kim H S,Kim Y J,Chin W J,et al. Development of optimal structural system for hybrid cable-stayed bridges using ultra high performance concrete[J]. Engineering,2013,5:720-728.
[17] Yoon H,Chin W J,Kim H S,et al. Conceptual design of hybrid cable-stayed bridge with central span of1000 m using UHPC[J]. Engineering,2013,5:744-750.
[18] JTG D64-2015,公路钢结构桥梁设计规范[S].
[19] JTG D62-2004,公路钢筋混凝土及预应力混凝土桥涵设计规范[S].
[20] GB 50010-2010,混凝土结构设计规范[S].
[21] JTG D60-2004,公路桥涵设计通用规范[S].
[22] JTG/T D65-01—2007,公路斜拉桥设计规范细则[S].