Model Test Study on Long-Span Railway Concrete Arch Bridge with Rigid Skeleton
ZHANG Shuangyang1, ZHAO Renda1, JIA Yi1, WANG Yongbao1, XIE Haiqing2
1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. China Railway Eryuan Engineering Group Co. Ltd., Chengdu 610031, China
Abstract：The Beipanjiang bridge is a 445 m concrete arch reinforced rigid skeleton bridge on the high-speed railway from Shanghai to Kunming. The bridge deck is designed to comply with design rail speeds of 350 km/h and subsequently requires strictly controlled stresses and deformation for this ballast-less track. To verify the safety of the bridge during construction and in service and to rationalise the use of outsourced concrete construction methods, a 1:7.5 scaled model based on the prototype bridge was constructed. The loading method and arrangement of control sections and measuring points are discussed. Comparing the test results and computed results provides a comprehensive understanding of the mechanical behavior of the bridge. The results indicate that the maximum stress of the steel tube is 250 MPa, located at the upper chord of 1/2 cross section and the maximum stress of the C60 outsourced concrete is 17 MPa, located at the side-box bottom of the half cross section, whilst the maximum displacement of the arch ring is 68 mm, also positioned at the half cross section. Considering the stress equivalent and geometric similarity principles, the comparative results indicate that the stress and displacement of the model bridge align with the design parameters of the prototype. Model test results prove that the stress and deformation of the prototype bridge can meet the requirements during construction.
顾安邦,刘忠,周水兴. 万县长江大桥混凝土时效和几何、材料等非线性因素影响分析[J]. 重庆交通学院学报,1999,18(44):1-7. GU Anbang, LIU Zhong, ZHOU Shuixing. Analysis of time dependent effects of concrete and geometrical nonlinearities, material nonlinearities of Wanxian Yangtze River bridge[J]. Journal of Chongqing Jiaotong Institute, 1999, 18(44):1-7.
[3]
郑皆连. 特大跨径PC拱桥悬拼合拢技术的探讨[J]. 中国公路学报,1999,1:41-48. ZHENG Jielian. Discussion on technology of suspending and connecting for the RC bridge with an unusual big span[J]. China Journal of Highway and Transport, 1999, 1:41-48.
[4]
结构工程试验中心拱桥课题组. 万县长江大桥钢筋混凝土拱模型试验研究[J]. 西南交通大学学报,1994,29(4):362-367. Structural Engineering Test Center Arch Bridge Research Group. Reinforced concrete arch model Test research of wanxian yangtze river bridge[J]. Journal of Southwest Jiaotong University, 1994, 29(4):362-367.
[5]
李晓斌,杨永清,蒲黔辉,等. 钢筋混凝土拱桥悬臂浇筑施工模型试验研究[J]. 西南交通大学学报,2007,42(5):526-530. LI Xiaobin, YANG Yongqing, PU Qianhui, et al. Model test of cantilever cashing construction of reinforced concrete arch bridge[J]. Journal of Southwest Jiaotong University, 2007, 42(5):526-530.
[6]
崔军,孙炳楠,楼文娟. 钢管混凝土桁架拱桥模型试验研究[J]. 工程力学,2004,21(5):83-86. CUI Jun, SUN Bingnan, LOU Wenjuan. Model test study on concrete filled steel-tube arch bridge[J]. Engineering Mechanics, 2004, 21(5):83-86.
[7]
李乔,田学民,张清华. 铁路大跨度提篮式系杆拱桥全桥模型试验[J]. 中国铁道科学,2003,24(1):88-92. LI Qiao, TIAN Xuemin, ZHANG Qinghua. A model test on long-span x-style arch bridge on railway[J]. China Railway Science, 2003, 24(1):88-92.
[8]
刘爱荣,张俊平,赵新生,等. 中山一桥模型试验及理论分析[J]. 中国公路学报,2005,18(3):75-79. LIU Airong, ZHANG Junping, ZHAO Xinsheng, et al. Model test of the first zhongshan bridge and theoretical analysis[J]. China Journal of Highway and Transport, 2005, 18(3):75-79.
[9]
范亮,龚尚龙,陈思甜. 特大跨径钢桁拱桥施工过程模型试验[J]. 西南交通大学学报,2010,45(4):502-507. FAN Liang, GONG Shanglong, CHEN Sitian. Model experiment of construction process of long-span steel truss bridge[J]. Journal of Southwest Jiaotong University, 2010, 45(4):502-507.
[10]
胡志坚,张明辉,孔祥韶,等. 大跨度钢桁架拱桥静动力相似模型[J]. 中国公路学报,2014,27(9):82-89. HU Zhijian, ZHANG Minghui, KONG Xiangshao, et al. Static and dynamic experimental model for long-span steel-truss arch bridge[J]. China Journal of Highway and Transport, 2014, 27(9):82-89.
[11]
陈宝春,赖秀英. 钢管混凝土收缩变形与钢管混凝土拱收缩应力[J]. 铁道学报,2016,38(2):112-123. CHEN Baochun, LAI Xiuying. Shrinkage deformation of concrete filled steel tube and shrinkage stress of concrete filled steel tubular arch[J]. Journal of the China Railway Society, 2016, 38(2):112-123.
[12]
ICHINOSE L H, WATANABE E, NAKAI H. An experimental study on creep of concrete filled steel pipes[J]. Journal of Constructional Steel Research, 2001, 57(4):453-466.
[13]
UY B. Static long-term effects in short concrete-filled steel box columns under sustained loading[J]. Aci Structural Journal, 2001, 98(1):96-104.
[14]
NEVILLE A M, DILGER W H, BROOKS J J. Creep of plain and structural concrete[M]. London and New York:Construction Press, 1983:194-199.
[15]
BAZANTZ P. Prediction of concrete creep and shrinkage:past, present and future[J]. Nuclear Engineering and Design, 2001, 203(1):27-38.
