高强钢筋增强UHPC-CFST组合桥墩抗震性能研究  

Seismic performance of UHPC-CFST composite piers reinforcedby high-strength steel bars

作　　者：郑仁亮[1,2] 庄一舟 张仁巍 曾武华[1,2] ZHENG Renliang;ZHUANG Yizhou;ZHANG Renwei;ZENG Wuhua(School of Civil Engineering,Sanming University,Sanming 365004,China;Fujian Provincial Key Laboratory ofEngineering Material&Structure Reinforcement,Sanming 365004,China;College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]三明学院建筑工程学院,福建三明365004 [2]工程材料与结构加固福建省高等学校重点实验室,福建三明365004 [3]浙江工业大学土木工程学院,浙江杭州310023

出　　处：《浙江工业大学学报》2025年第1期40-51,共12页Journal of Zhejiang University of Technology

基　　金：国家自然科学基金资助项目(51778147);福建省自然科学基金资助项目(2020J01389)。

摘　　要：采用有限元软件ABAQUS,开展了高强钢筋增强UHPC-CFST组合桥墩的抗震数值建模分析,通过与已有试验结果的对比,验证了建模方法的准确性。在此基础上,分析了轴压比、UHPC强度、UHPC厚度和钢管屈服强度等参数对组合桥墩受力性能的影响规律,并给出了各参数的建议取值范围。研究结果表明:增大轴压比和纵筋配筋率可提升组合桥墩的水平承载力和耗能能力,然而会限制试件的变形;提高UHPC强度和UHPC厚度,组合桥墩的水平承载力和位移延性系数均呈现出先增大后减小的趋势;提升钢管屈服强度可稳步增强组合桥墩的水平承载力;增加钢管厚度可明显提升组合桥墩的抗震性能,而体积配箍率和混凝土强度对组合桥墩的抗震性能影响较小。基于分析数据样本,采用多元非线性回归分析得到水平峰值荷载和位移延性系数的计算方法,公式计算值与有限元分析值吻合良好。The finite element software ABAQUS was used to carry out the seismic numerical modeling analysis of UHPC-CFST composite piers reinforced by high-strength steel bars,and the accuracy of the modeling method was verified by comparing it with the existing test results.On this basis,the influence of axial compression ratio,UHPC strength,UHPC thickness,and yield strength of the steel tube on the mechanical properties of UHPC-CFST composite piers reinforced by high-strength steel bars was analyzed,and the suggested value ranges of each parameter were given.The results show that the increase of axial compression ratio and longitudinal reinforcement ratio can improve the horizontal bearing capacity and energy dissipation capacity of composite piers but limit the deformation of the specimens.With the increase of UHPC strength and UHPC thickness,the horizontal bearing capacity and displacement ductility coefficient of the composite piers increase first and then decrease.Increasing the yield strength of the steel tube can steadily enhance the horizontal bearing capacity of composite piers.The increase in steel tube thickness can significantly improve the seismic performance of composite piers while the volumetric stirrup ratio and concrete strength have little effect on the seismic performance of composite piers.Based on the analyzed data samples,a calculation method of horizontal peak load and displacement ductility coefficient was obtained by multivariate nonlinear regression analysis,and the calculated values of the formulas were in good agreement with the finite element analysis values.

关 键 词：高强钢筋 超高性能混凝土 钢管混凝土柱 有限元 计算方法 

分 类 号：TU398.9[建筑科学—结构工程]