西安建筑科技大学学报(自然科学版)

竖向荷载作用下预制叠合剪力墙收缩徐变效应研究

吴曦¹,汪梦甫²

(1.湖南城市学院土木工程学院,湖南益阳 413000; 2.湖南大学土木工程学院,湖南长沙 410082)

Investigation of shrinkage and creep effect of precast superimposed shear wall under axial load

WU Xi¹, WANG Mengfu²

(1.College of Civil Engineering, Hunan City University, Hunan Yiyang 413000, China; 2.College of Civil Engineering, Hunan University, Changsha 410082, China)

Keywords： superimposed shear wall; shrinkage; creep; axial load

DOI: 10.15986/j.1006-7930.2023.01.015

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参考文献

为研究预制叠合剪力墙在竖向荷载作用下的收缩徐变效应,制作了一片小尺寸预制叠合剪力墙,对试件施加竖向荷载,得到了预制叠合剪力墙的收缩徐变反应.基于龄期修正有效弹性模量法(AEMM),考虑剪力墙结构长期收缩徐变效应引起的截面内力重分布,建立了长期竖向荷载作用下叠合剪力墙的收缩徐变及截面应力计算模型.经过比较,采用GL2000收缩徐变预测模型计算得到的结果与试验曲线吻合良好.在此基础上,比较了十年服役周期内,混凝土强度等级、纵向钢筋配筋率、环境湿度、初始加载龄期和轴压比对预制叠合剪力墙的收缩徐变效应的影响.

To investigate the shrinkage and creep effect of precast superimposed reinforced concrete shear wall(SRCSW)under axial load, one SRCSW specimen with reduced scale was manufactured. The micro strain developed by shrinkage effect and creep response of SRCSW specimen was documented when applied by the long term axial load. Considering the internal force redistribution caused by reinforcement during the long-term shrinkage and creep effect of SRCSW, the analytical model for calculating the stain response and the stress of cross-section were performed by using the age-adjusted effective modulus method(AEMM). The predicted result calculated by GL2000 model is in better agreement with the test result when compared to the other prediction models. Finally, the factors such as concrete grade, longitudinal reinforcement ratio, environmental humidity, initial loading age, as well as axial load ratio, which would affect the shrinkage and creep behavior of the analytical model under constant axial force for ten years, were discussed by parametric analysis.

引言
1 收缩徐变试验
2 试验结果及分析
3 预制叠合剪力墙收缩徐变效应分析
4 结论

图1 试件配筋情况(单位: mm)<br/>Fig.1 Reinforcement details of specimen(unit: mm)

图1 试件配筋情况(单位: mm)
Fig.1 Reinforcement details of specimen(unit: mm)

表1 自密实混凝土材料参数<br/>Tab.1 Mechanical properties of SCC

表1 自密实混凝土材料参数
Tab.1 Mechanical properties of SCC

表2 钢筋材料参数<br/>Tab.2 Mechanical properties of reinforcement

表2 钢筋材料参数
Tab.2 Mechanical properties of reinforcement

图2 应变计安装布置图<br/>Fig.2 Arrangement of strain gauges

图2 应变计安装布置图
Fig.2 Arrangement of strain gauges

图3 试验装置<br/>Fig.3 Experimental setup for shrinkage-creep tests

图3 试验装置
Fig.3 Experimental setup for shrinkage-creep tests

图4 混凝土的徐变<br/>Fig.4 Creep strain of concrete

图4 混凝土的徐变
Fig.4 Creep strain of concrete

图5 开放环境条件竖向荷载作用下混凝土应变组成<br/>Fig.5 Strain composition of concrete under axial load in a normal environment

图5 开放环境条件竖向荷载作用下混凝土应变组成
Fig.5 Strain composition of concrete under axial load in a normal environment

图6 棱柱体收缩应变及环境湿度<br/>Fig.6 Shrinkage strain of cylinder and environmental humidity

图6 棱柱体收缩应变及环境湿度
Fig.6 Shrinkage strain of cylinder and environmental humidity

图7 竖向测点应变变化<br/>Fig.7 Time-dependent strains of vertical strain gauges

图7 竖向测点应变变化
Fig.7 Time-dependent strains of vertical strain gauges

表3 试件测点应变<br/>Tab.3 Strains data of monitoring points

表3 试件测点应变
Tab.3 Strains data of monitoring points

图8 水平向测点应变变化<br/>Fig.8 Time-dependent strains of horizontal strain gauges

图8 水平向测点应变变化
Fig.8 Time-dependent strains of horizontal strain gauges

图9 收缩徐变作用下剪力墙的变形协调<br/>Fig.9 Deformation coordination of shear wall under the effect of shrinkage and creep

图9 收缩徐变作用下剪力墙的变形协调
Fig.9 Deformation coordination of shear wall under the effect of shrinkage and creep

图10 收缩徐变预测值与试验值比较<br/>Fig.10 Comparison of shrinkage and creep strain between calculation and test results

图10 收缩徐变预测值与试验值比较
Fig.10 Comparison of shrinkage and creep strain between calculation and test results

图11 收缩徐变效应导致钢筋和混凝土应力变化曲线<br/>Fig.11 Time development of concrete and reinforcement stress on account of the shrinkage and creep effect

图11 收缩徐变效应导致钢筋和混凝土应力变化曲线
Fig.11 Time development of concrete and reinforcement stress on account of the shrinkage and creep effect

表4 预制叠合剪力墙收缩徐变基准参数<br/>Tab.4 Benchmark parameters of shrinkage and creep effect of SRCSW

表4 预制叠合剪力墙收缩徐变基准参数
Tab.4 Benchmark parameters of shrinkage and creep effect of SRCSW

表5 不同混凝土强度试件混凝土和钢筋应力值<br/>Tab.5 Strains of concrete and reinforcement of SRCSW with different strength concrete

表5 不同混凝土强度试件混凝土和钢筋应力值
Tab.5 Strains of concrete and reinforcement of SRCSW with different strength concrete

图12 不同混凝土强度等级试件增量应变曲线<br/>Fig.12 Incremental strain curves of SRCSWs with different strength concrete

图12 不同混凝土强度等级试件增量应变曲线
Fig.12 Incremental strain curves of SRCSWs with different strength concrete

图13 不同配筋率试件增量应变曲线<br/>Fig.13 Incremental strain curves of SRCSWs with different reinforcement ratio

图13 不同配筋率试件增量应变曲线
Fig.13 Incremental strain curves of SRCSWs with different reinforcement ratio

表6 不同配筋率试件混凝土和钢筋应力值<br/>Tab.6 Strains of concrete and reinforcement of SRCSW with different reinforcement ratio

表6 不同配筋率试件混凝土和钢筋应力值
Tab.6 Strains of concrete and reinforcement of SRCSW with different reinforcement ratio

表7 不同环境湿度下试件混凝土和钢筋应力值<br/>Tab.7 Strains of concrete and reinforcement of SRCSW under different environmental humidities

表7 不同环境湿度下试件混凝土和钢筋应力值
Tab.7 Strains of concrete and reinforcement of SRCSW under different environmental humidities

图14 不同环境湿度下试件增量应变曲线<br/>Fig.14 Incremental strain curves of SRCSWs under different environmental humidities

图14 不同环境湿度下试件增量应变曲线
Fig.14 Incremental strain curves of SRCSWs under different environmental humidities

图15 不同初始加载龄期下试件增量应变曲线<br/>Fig.15 Incremental strain curves of SRCSWs with different initial loading ages

图15 不同初始加载龄期下试件增量应变曲线
Fig.15 Incremental strain curves of SRCSWs with different initial loading ages

表8 不同初始加载龄期试件混凝土和钢筋应力值<br/>Tab.8 Strains of concrete and reinforcement of SRCSW with different initial loading ages

表8 不同初始加载龄期试件混凝土和钢筋应力值
Tab.8 Strains of concrete and reinforcement of SRCSW with different initial loading ages

表9 不同轴压比试件混凝土和钢筋应力值<br/>Tab.9 Strains of concrete and reinforcement of SRCSW with different axial load ratio

表9 不同轴压比试件混凝土和钢筋应力值
Tab.9 Strains of concrete and reinforcement of SRCSW with different axial load ratio

图16 不同轴压比试件增量应变曲线<br/>Fig.16 Incremental strain curves of SRCSWs with different axial load ratio

图16 不同轴压比试件增量应变曲线
Fig.16 Incremental strain curves of SRCSWs with different axial load ratio

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期刊信息

西安建筑科技大学学报(自然科学版)
（1957年创刊双月刊）

主管单位：陕西省教育厅

主办单位：西安建筑科技大学

主　　编：刘加平（院士）

副主编：史庆轩（常务）张引科张小龙

国内刊号：CN61-1295/TU

I S S N：1006-7930

地　　址：西安市雁塔路中段13号

国内发行：西安建筑科技大学学报编辑部

国外发行：中国出版对外贸易总公司

编辑出版：西安建筑科技大学学报编辑部

备注

引言

1 收缩徐变试验

2 试验结果及分析

3 预制叠合剪力墙收缩徐变效应分析

4 结论

期刊信息