同济大学学报（自然科学版）2023，Vol.51Issue(12)：1822-1834,13.DOI:10.11908/j.issn.0253-374x.23101
焊钉集群式后结合超高性能混凝土组合桥面板抗弯性能
Flexural Performance of Post-Combined Ultra-High Performance Concrete Composite Bridge Deck with Grouped-Stud Arrangement
摘要
Abstract
To investigate the effects of grouped-stud arrangement on the mechanical performance of the post-combined UHPC(ultra-high performance concrete)composite deck,bending load tests and finite element parametric analysis based on the UHPC plastic damage model were conducted for a composite deck specimen with averagely spaced studs and a post-combined composite deck specimen with grouped-stud connection.The test results show that the failure characteristics of these two specimens are UHPC plate crushing and steel U-rib bottom yielding.The elastic flexural stiffness of the specimen with grouped-stud connection and the one with averagely spaced studs are 232 kN·mm-1 and 213 kN·mm-1 respectively,and the bearing capacity are 2 154 kN and 2 049 kN respectively.The maximum interface slip value of these two specimens is less than 0.2 mm before the U-rib yielding.These two specimens have the same strain distribution and strain development pattern.The cross-sectional strain distributions of the specimens approximately obey the plane section assumption.The parametric analysis results show that there is no significant change in the bearing capacity and elastic bending stiffness when the grouped-stud hole spacing is increased from 600 mm to 1 200 mm.When the grouped-stud hole size is the same,the hole spacing has no significant effect on the bonding state of UHPC bonding interfaces.The 600 mm spacing of grouped-stud holes can better ensure the safety of studs and the cross-sectional combination effect than the 1 200 mm arrangement.Comparing the flexural performance of parametric models,the longitudinal spacing of 600 mm combined with the 2×3 grouped-stud arrangement in the hole is more favorable to improve the stress state of the post-combined steel-UHPC composite deck under positive bending.关键词
钢-UHPC组合桥面板/群钉连接件/受弯试验/有限元模拟/参数化分析Key words
steel-UHPC(ultra-high performance concrete)composite deck/grouped-stud connector/flexural test/finite element simulation/parametric analysis分类
交通工程引用本文复制引用
徐晨,田霖博,许琴东,于西尧,张玉彬,苏庆田..焊钉集群式后结合超高性能混凝土组合桥面板抗弯性能[J].同济大学学报（自然科学版）,2023,51(12):1822-1834,13.基金项目
国家自然科学基金(51978501) （51978501）
内蒙古鄂尔多斯科技计划(2022YY035) （2022YY035）
国家重点研发计划(2017YFC0703402) （2017YFC0703402）
