UHPC免拆模板钢筋混凝土柱抗震性能参数分析及承载力计算  

Parameter analysis of seismic behavior and bearing capacity calculation of reinforced concrete columns with stay-in-place UHPC formwork

作　　者：王朋[1,2] 尤学辉 史庆轩 陶毅[1,2] 戎翀[1,2] 黄杰 WANG Peng;YOU Xuehui;SHI Qingxuan;TAO Yi;RONG Chong;HUANG Jie(College of Civil Engineering,Xi an University of Architecture and Technology,Xi an 710055,Shaanxi,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education,Xi an University of Architecture and Technology,Xi an 710055,Shaanxi,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《建筑科学与工程学报》2025年第1期41-50,共10页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(52178159,52178505,52108171);陕西省教育厅协同创新中心项目(23JY040)。

摘　　要：为研究UHPC免拆模板钢筋混凝土柱在不同参数影响下的抗震性能,基于ABAQUS软件中混凝土塑性损伤(CDP)模型,考虑模板与后浇混凝土的界面接触滑移建立了数值分析模型;讨论了轴压比、普通混凝土强度、配筋率和模板厚度等参数对UHPC免拆模板-RC柱承载力和延性的影响;基于平截面假定,给出了UHPC免拆模板-RC柱的承载力计算公式。结果表明:建立的有限元模型能较好地模拟试件的承载力、骨架曲线和混凝土损伤情况;随着轴压比的增大,试件的承载力和延性均先增大后减小,轴压比为0.7时承载力和延性均最高;随着混凝土强度的提高,试件的承载力逐渐增大,但增长幅度却逐渐降低;提高配筋率可以提高试件的承载力,但对延性影响不大;模板的厚度对试件的承载力和延性影响显著,当模板厚度从10 mm增加到25 mm时,试件的承载力提高了24.1%,但其延性降低了43.8%,在保证试件拥有足够的承载力和变形能力下,建议UHPC模板厚度选择15~20 mm;基于平截面假定得到的承载力计算方法可以很好地预测试件的承载能力,计算值与模拟值(试验值)的比值均值为0.97,标准差为0.04。To investigate the seismic behavior of reinforced concrete columns with stay-in-place UHPC formwork under the influence of various parameters,based on the concrete damage plastic(CDP)model in ABAQUS software,a numerical analysis model was established considering the bonding interface slip between formwork and concrete.The effect of axial compression ratio,ordinary concrete strength,reinforcement ratio and formwork thickness on the bearing capacity and ductility of reinforced concrete columns with stay-in-place UHPC formwork were discussed.Based on the plane section assumption,a formula for predicting the bearing capacity of UHPC formwork-RC column was provided.The results show that the established finite element model can well simulate the bearing capacity,skeleton curve and concrete damage of the specimen.With the increase of axial compression ratio,the bearing capacity and ductility of specimen first increase and then decrease,and the bearing capacity and ductility reach the maximum when the axial compression ratio is 0.7.With the increase of concrete strength,the bearing capacity gradually increases,but the growth rate gradually decreases.Increasing the reinforcement ratio can enhance the bearing capacity of specimen,but it has little effect on ductility.The thickness of the formwork has a significant influence on the bearing capacity and ductility.When the formwork thickness is increased from 10 mm to 25 mm,the bearing capacity is increased by 24.1%,but its ductility is decreased by 43.8%.Under the condition that the specimen has sufficient bearing capacity and deformation capacity,it is suggested that the formwork thickness can be 15-20 mm.The bearing capacity calculation method based on the plane section assumption can well predict the bearing capacity of the specimen.The average ratio of the calculated value to the simulated value(test value)is 0.97,and the standard deviation is 0.04.

关 键 词：UHPC免拆模板 钢筋混凝土柱 抗震性能 数值模拟 承载力计算 

分 类 号：TU375[建筑科学—结构工程]