摘要
盖梁的轻量化发展是实现全预制桥梁的必然要求。基于已有的预制模壳填芯混凝土悬臂盖梁静力试验,采用有限元软件ABAQUS对试件PRC1进行数值分析,有限元计算结果和试验结果吻合较好,验证了有限元模型的可靠性。通过修改已验证的有限元模型参数,进一步分析外壳混凝土强度、纵筋配筋率和交界面接触设置对预制模壳填芯混凝土悬臂盖梁力学性能的影响。基于钢筋混凝土一般构件的承载力计算方法建立试件的理论计算公式,并对提出的计算公式进行验证。研究结果表明:当外壳材料为普通混凝土时,混凝土强度等级从C35增加到C60,峰值承载力仅提高1%,而当外壳材料为超高性能混凝土(UHPC)时,峰值承载力相较C35提高了22%。纵筋配筋率与峰值承载力呈线性增长趋势,当顶部第1排纵筋直径从14 mm增加到22 mm时,峰值承载力提高了34%。交界面接触设置为绑定约束比面面接触的峰值承载力更接近试验值,且后者是相对保守的。基于钢筋混凝土一般构件建立的承载力计算方法所计算结果与试验结果和有限元分析结果吻合较好。
The lightweight development of bent caps is an inevitable requirement to realize fully prefabricated bridges.Based on the existing static test of cantilevered bent caps with precast shell formwork and core-filled concrete,the numerical analysis of specimen PRC1 was carried out by using finite element software ABAQUS,and the finite element calculation results matched well with the test results,which verified the reliability of the finite element model.By modifying the parameters of the verified finite element model,the effects of shell formwork concrete strength,longitudinal rebar ratio,and interface contact settings on the mechanical properties of cantilevered bent caps with precast shell formwork and core-filled concrete were further analyzed.The theoretical calculation formula of the specimen was established based on the calculation method of bearing capacity of reinforced concrete general member,and the proposed calculation formula was verified.The results show that when the shell formwork material is normal concrete,the peak bearing capacity increases by only 1%when the normal concrete strength grade is increased from C35 to C60,while the peak bearing capacity when the shell formwork material is ultra-high performance concrete(UHPC)increases by 22%compared with C35.The longitudinal rebar ratio shows a linear increase trend with the peak bearing capacity,and when the diameter of the top row of longitudinal rebar is increased from 14 mm to 22 mm,the peak bearing capacity is increased by 34%.The peak bearing capacity of the interface contact set to tie constraint is closer to the test results than the surface-to-surface contact,and the latter is relatively conservative.The results of the bearing capacity calculation method based on reinforced concrete general member match well with the test results and the finite element analysis results.
作者
贾俊峰
张福香
张瑞
张建勋
JIA Junfeng;ZHANG Fuxiang;ZHANG Rui;ZHANG Jianxun(State Key Laboratory of Bridge Engineering Safety and Resilience,Beijing University of Technology,Beijing 100124,China;Zhengzhou Highway Development Center,Zhengzhou 450015,China;Zhengzhou Transportation Planning Survey and Design Institute,Zhengzhou 450001,China)
出处
《河南科技大学学报（自然科学版）》
CAS
北大核心
2024年第3期53-60,共8页
Journal of Henan University of Science And Technology:Natural Science
基金
国家自然科学基金项目(52178449)
河南省交通运输厅科技项目(2022-7-3)。
关键词
预制模壳填芯混凝土悬臂盖梁
静力试验
有限元
参数分析
承载力计算
cantilevered bent caps with precast shell formwork and core-filled concrete
static test
finite element
parametric analysis
bearing capacity calculation
