摘要
为研究预制拼装UHPC节段薄壁箱梁桥的抗弯性能,以一座102 m跨径的节段拼装体外预应力UHPC薄壁箱梁桥为基础,通过对实际桥梁薄壁箱梁截面进行工字形截面等效处理,对3片节段梁(3∶20的体外预应力UHPC节段梁)开展四点弯曲试验,研究了不同胶接缝形式对节段梁抗弯性能的影响,获得了破坏模式、接缝张开宽度、挠度等相关试验结果.试验结果表明,节段梁的主要薄弱位置为接缝及其附近区域,其余位置的UHPC基体几乎无裂缝.提出了UHPC节段箱梁刚度的计算模型,该模型能够较为准确地预测UHPC节段箱梁的刚度.本研究可为UHPC节段薄壁箱梁桥的推广与发展提供参考,丰富体外预应力胶接缝UHPC节段梁的计算理论.
To investigate the flexural performance of precast assembled UHPC segmental thin-walled box girder bridges,this study is based on an externally prestressed UHPC segmental thin-walled box girder bridge with span length of 102 m.The cross-section of the actual bridge’s thin-walled box girder is equivalently modeled as an Isection.Subsequently,a four-point bending tests were conducted on three 3∶20 externally prestressed UHPC segmental beams to study the effect of different glued joint types on the flexural performance of the segmental beams,and the failure modes,joint opening width,deflection,and other related test results were obtained.The experimental results indicate that the main cracks in the segmental beams occur near the joints,with almost no cracks observed within the UHPC matrix itself.A calculation model for the stiffness of UHPC segmental box girders is proposed,which can accurately predict the stiffness of segmental box girders.This study provides valuable references for the further promotion and development of UHPC segmental thin-walled box girder bridges and enriches the calculation theories for externally prestressed glued joint UHPC segmental beams.
作者
赵华
罗穗
胡俊德
罗梓豪
钱煌果
廖志练
扈振涛
ZHAO Hua;LUO Sui;HU Junde;LUO Zihao;QIAN Huangguo;LIAO Zhilian;HU Zhentao(College of Civil Engineering,Hunan University,Changsha 410082,China;Key Laboratory for Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China;Yingde City Highway Affairs Center,Yingde 513099,China;Qingyuan Traffic and Transportation Bureau,Qingyuan 511500,China)
出处
《湖南大学学报(自然科学版)》
北大核心
2026年第3期16-25,共10页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(52278179)。
关键词
桥梁工程
UHPC薄壁箱梁
节段梁
抗弯性能
bridge engineering
UHPC thin-walled box girder
segmental beam
flexural performance
