摘要
针对目前钢筋混凝土桥面板在车辆荷载作用下易开裂加速了桥面板破坏的问题,提出了一种新型的提高桥面板安全性和耐久性的混杂纤维混凝土(HFRC)组合梁桥桥面板。首先,设计4个试件(2个HFRC试件,2个普通混凝土试件)分别进行单调和循环加载试验,从试件的破坏模式、裂缝发展、荷载-挠度、荷载-应变等方面分析桥面板的力学性能。然后引入HFRC本构关系,应用ABAQUS建立了HFRC桥面板基准有限元模型,研究了不同掺量(体积分数,下同)下钢纤维(0%、0.5%、1%和1.5%)和聚丙烯纤维(0%、0.05%、0.1%和0.15%)对桥面板静力性能的影响。最后根据试验和数值模拟结果,在钢筋混凝土板抗冲切承载力公式现有规范基础上,引入纤维特征值。研究结果表明:纤维的桥接作用不仅能提高桥面板的开裂荷载和极限承载力,在单调和循环加载下的承载力分别提升了9%和6%,能够起到有效的增强、增韧和阻裂作用。随着钢纤维掺量增加,桥面板的承载能力和抗裂性能得到改善,而聚丙烯纤维对桥面板的开裂荷载和极限承载力的改善效果不大,但可以改善桥面板的韧性,聚丙烯纤维和钢纤维两者混合时更能提高桥面板承载力、刚度和屈曲后的韧性。提出的HFRC桥面板承载力计算方法,可为HFRC桥面板设计提供参考。
In order to solve the problem that the reinforced concrete bridge panel was easy to crack under the action of load,which made it difficult to replace the bridge panel in concrete,a new hybrid fiber concrete(HFRC)composite beam bridge panel was proposed.First,four test specimens(2 HFRC specimens,2 ordinary concrete specimens)were designed and tested under monotonic and cyclic loading,the mechanical properties of the bridge deck were analyzed from the failure mode,crack development,load-deflection and load-strain.Then the standard finite element model was set up considering the constitution relationship of HFRC,and the effects of different dosages(volume fraction,the same below)steel fiber(0%,0.5%,1%and 1.5%)and polypropylene fiber(0%,0.05%,0.1%and 0.15%)on the static properties of bridge deck were studied.Finally,according to the experimental and numerical results,based on the existing specification of the formula of reinforced concrete slab shear bearing capacity,fiber characteristic values were introduced,the calculation method of bearing capacity of HFRC bridge deck was proposed based on the specifications.The results show that the fiber not only increases the bearing capacity of the bridge deck under monotonic and cyclic loading by 9%and 6%,but also plays an effective role in strengthening,toughening and crack resistance.The capacity and crack resistance of bridge deck are improved with the increasing of steel fiber content,however the amount of polypropylene fiber has little effect on the improvement of the cracking load and ultimate bearing capacity of the bridge deck,but it can improve the ductility of the bridge deck.The combination of polypropylene fiber and steel fiber can improve the bearing capacity,stiffness and toughness of the bridge panel after buckling.The calculation method can provide a reference for the design of HFRC bridge deck.5 tabs,13 figs,24 refs.
作者
何余良
刘镓萌
曹鑫雨
应森源
杨赢
项贻强
HE Yu-liang;LIU Jia-meng;CAO Xin-yu;YING Sen-yuan;YANG Ying;XIANG Yi-qiang(School of Civil Engineering,Shaoxing University,Shaoxing 312000,Zhejiang,China;Zhejiang Zhongqingda Construction Industry Co.,LTD,Shaoxing 312000,Zhejiang,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,Zhejiang,China)
出处
《长安大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第2期80-88,共9页
Journal of Chang’an University(Natural Science Edition)
基金
绍兴市产业关键技术攻关计划项目(2022B43002)
浙江省建设科研项目(2022K240)。
关键词
桥梁工程
HFRC
桥面板
试验
数值模拟
承载力
bridge engineering
HFRC
bridge deck
experiment
numerical stimulation
capacity
