文献类型：期刊文献

中文题名：混杂纤维混凝土螺栓剪力键疲劳性能

英文题名：Fatigue properties of bolt connectors in HFRC

作者：何余良[1];周仁甫[1];胡立普[1];曹宗勇[2];项贻强[3]

机构：[1]绍兴文理学院土木工程学院,浙江绍兴312000;[2]华汇工程设计集团股份有限公司,浙江绍兴312000;[3]浙江大学建筑工程学院,浙江杭州310058

年份：2021

卷号：41

期号：3

起止页码：95

中文期刊名：长安大学学报：自然科学版

收录：CSTPCD、、CSCD2021_2022、Scopus、北大核心、CSCD、北大核心2020

基金：浙江省自然科学基金项目(LY18E080017);浙江省建设科技项目(2020K127)。

语种：中文

中文关键词：桥梁工程;混杂纤维混凝土;螺栓剪力键;疲劳试验;疲劳寿命;FE-SAFE

外文关键词：bridge engineering;HFRC;bolt connector;fatigue test;fatigue life;FE-SAFE;

中文摘要：针对目前钢筋混凝土桥面板在车载反复作用下易开裂,以及焊钉剪力键锚固在混凝土中使得劣化桥面板难以更换问题,提出一种新型混杂纤维混凝土(HFRC)螺栓剪力键。为研究混杂纤维混凝土螺栓剪力键在疲劳荷载作用下的疲劳性能,设计4个推出试件(2个HFRC试件,2个普通混凝土(NC)试件)分别进行静载推出试验和疲劳推出试验;应用有限元ABAQUS,引入HFRC的本构关系以及螺栓孔与螺杆间隙的影响,建立HFRC螺栓剪力键基准有限元模型,将基准有限元模型计算结果导入疲劳分析软件FE-SAFE进行疲劳分析,并通过试验验证了其可行性;再应用有限元ABAQUS和疲劳分析软件FE-SAFE分析纤维、螺栓直径、混凝土强度等参数对HFRC螺栓剪力键疲劳寿命的影响,并对疲劳分析软件FE-SAFE计算结果进行非线性回归拟合。研究结果表明:掺入纤维后可以提高螺栓剪力键的承载力、初始刚度和疲劳寿命;静载破坏模式均为螺栓被剪断,在疲劳荷载作用下HFRC和NC推出试件破坏特征不同,HFRC试件为螺栓剪断,NC试件是混凝土板破坏;随着荷载幅值的增加,螺栓剪力键疲劳寿命减小;随着纤维掺入,螺栓直径增大以及混凝土强度的增加,螺栓剪力键疲劳寿命均增加。提出的HFRC螺栓剪力键疲劳寿命计算方法可为HFRC螺栓剪力键设计提供参考。

外文摘要：The performance of concrete bridge slabs had been degenerating under the action of increasing traffic and overloading,and it was also difficult to replace the deteriorated bridge elements for the stud connectors in concrete slab.A new through-bolt shear connector with prefabricated concrete slab was explored.To investigate the fatigue performance of hybrid fiber reinforced concrete(HFRC)bolt connectors under fatigue load,four test specimens were designed and tested.Then the standard finite element model was set up considering the constitution relationship of HFRC and the influence of the bolt-hole clearance and conducted analysis by software FE-SAFE.The results were validated by the test results.Combined with finite element software ABAQUS and fatigue analysis software FE-SAFE,the effects of parameters(bolt diameter,concrete strength and fiber)on the fatigue life of bolt connectors were studied.A method calculating the fatigue life of the HFRC bolt connectors was proposed.The results show that the bearing capacity,initial stiffness and fatigue life of the bolt connectors increased after the fibers is incorporated.The failure mode is the bolts are sheared off under static load.As to the failure mode of fatigue test,the bolts are sheared off on one side for the HFRC specimen,and the concrete slabs are broken for the NC specimen.The calculation results of FE-SAFE find when the bolt diameter and concrete strength increase,the fibers are incorporated and the fatigue life of bolt connectors increase.Finally,a non-linear regression is performed on the data obtained from the FE-SAFE software.It provide a reference for the future design of the HFRC bolt connectors.8 tabs,10 figs,30 refs.