摘要
为实现全预制装配式桥梁工程,满足桥梁上部结构的快速建造需求,基于超高性能混凝土(UHPC)和碳纤维增强聚合物筋(CFRP)的优越力学性能,提出基于高性能材料接缝的预制拼装桥面板。对13个试件开展静力和疲劳试验,揭示新型预制拼装桥面板的破坏形态,探明疲劳荷载作用下各力学性能指标衰减规律;提出静力作用下承载力和挠度的预测方法,建立考虑疲劳效应的改进挠度计算方法和疲劳损伤模型。试验结果表明:静力作用下,基于高性能材料接缝的预制拼装桥面板均具有理想的破坏形态,增多预埋焊接栓钉的数量和增大锚固区间距明显提高承载力;疲劳荷载作用下,桥面板的挠度､刚度和耗能随疲劳次数的发展趋势分为3个阶段:损伤快速增长阶段,损伤缓慢累积阶段和疲劳损伤破坏阶段;建立的承载力和挠度预测模型具有良好精度;提出的考虑疲劳效应的改进挠度预测方法和疲劳损伤模型,可为评估新型桥面板的挠度和疲劳损伤程度提供参考。为了充分验证接缝连接形式和分析模型的有效性,今后研究将增加试件的类型与数量。
A novel connection of precast bridge deck panels(PCDPs)was proposed for fully prefabricated bridges based on the superior mechanical properties of high-performance materials,such as ultra-high performance concrete(UHPC)and carbon fiber reinforced polymer(CFRP)tendons.This connection meets the demand for rapid construction of bridge superstructures.Static and fatigue tests on 13 specimens were conducted.Damage patterns of PCDPs with high performance connections were revealed.The degenerative laws of mechanical properties indexes under fatigue were analyzed.In addition,analytical models of bearing capacity and deflection under static load were proposed,and the improved deflection calculation method and damage function considering the fatigue effect were presented as well.Experimental results indicate that desirable failure modes of PCDPs with high performance connections under moment and shear were observed.The bearing capacity of the proposed connections can be effectively inproved by increasing the quantity of welded studs and the distance of anchorage.The trends of deflection,stiffness,and energy dissipation after different fatigue cycles include three stages:rapid development of fatigue damage,slow accumulation of damage,and failure stage.The improved analytical models of bearing capacity and deflection have high accuracy compared with the test data.The proposed fatigue damage function and fatigue deflection calculation method are able to effectively evaluate the deflection and damage degree of the PCDPs with high performance connections.To further validate the reliability of proposed connections and analytical models,more specimens will be used and analyzed in future studies.
作者
胡梦涵
韩强
贾振雷
杜修力
焦驰宇
龙佩恒
Hu Menghan;Han Qiang;Jia Zhenlei;Du Xiuli;Jiao Chiyu;Long Peiheng(Beijing University of Civil Engineering and Architecture,Beijing100044,China;Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education,Beijing University of Technology,Beijing100124,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2023年第7期69-81,91,共14页
China Civil Engineering Journal
基金
国家自然科学基金(51838010)
北京市教育委员会项目(IDHT20190504)。
关键词
预制拼装桥面板接缝
超高性能混凝土
碳纤维增强聚合物预应力筋
静力和疲劳试验
预测模型
connections for precast bridge deck panels
ultra-high performance concrete
carbon fiber reinforced polymer tendon
static and fatigue test
prediction models
