湖南大学学报（自然科学版）2019，Vol.46Issue(1)：76-84,9.DOI:10.16339/j.cnki.hdxbzkb.2019.01.008
钢-UHPC轻型组合桥面板实桥试验研究
Research on Field Measurement of Steel-UHPC Lightweight Composite Deck
摘要
Abstract
The steel-UHPC lightweight composite deck is a novel bridge deck pattern that consists of an orthotropic steel deck (OSD) and a thin ultra-high performance concrete (UHPC) layer. In order to reveal the effect of UHPC layer on the performance of the OSD, field measurement was performed for Fengxi Bridge to evaluate the stress ranges in the typical detail categories of the OSD with/without UHPC layer, respectively. Before the field measurement was conducted, the global finite element model of Fengxi Bridge was developed to determine the instrumented sections. Then, a triaxial loading vehicle, according to the loading scheme, was arranged to run on the bridge deck with/without UHPC layer at a low speed, respectively. The field measurement data of the typical detail categories were collected and sorted. Finally, a local finite element model of Fengxi Bridge was built to compare with the field measured results. The field measurements show that the stress response of the typical detail categories are significantly reduced after installment of UHPC layer. For the detail categories related to the steel deck (i.e., rib-todeck weld, deck splices, and deck of rib-to-deck at diaphragm joint) , the stress range decreased by about 75％ ～90％;for the detail categories related to the trapezoidal rib (i.e., rib splices, weld end of rib-to-diaphragm joint, and rib of rib-to-deck at diaphragm joint) , the stress range decreased by about 65％ to 80％; for the detail categories related to the diaphragms (i.e., cut-out on diaphragm, diaphragm base metal at cut-out transition, and diaphragm of rib-to-deck at diaphragm joint) , the stress range decreased by about 20％ to 50％. Meanwhile, with the decrease of the distance from detail categories to top surface, the contribution of UHPC layer to the stress reduction of the detail categories was significantly increased. The results of the local finite element model agreed well with the measured results, and the similar rules were obtained. The field measured results of this paper provide the reference data for the application of steel-UHPC lightweight composite bridge deck.关键词
桥梁工程/轻型组合桥面板/现场试验/疲劳细节/应力幅/UHPC层Key words
bridge engineering/lightweight composite bridge deck/field test/fatigue details/stress range/UHPC layer分类
交通工程引用本文复制引用
裴必达,李立峰,邵旭东,王连华,曾研..钢-UHPC轻型组合桥面板实桥试验研究[J].湖南大学学报（自然科学版）,2019,46(1):76-84,9.基金项目
国家自然科学基金资助项目(51278183,51778223) （51278183,51778223）
湖南省住房和城乡建设厅科技项目(KY201508) （KY201508）
陕西省交通厅科研课题(14-18K) （14-18K）
