西安建筑科技大学学报(自然科学版)

开展了4个轴压比为0.4的预制混凝土柱接缝的抗剪试验,研究了界面构造(凿毛注浆、齿槽注浆、光面注浆、凿毛叠合)对接缝抗剪性能的影响.凿毛注浆和凿毛叠合界面的凹凸深度约6 mm; 齿槽注浆界面的齿槽深度约20 mm; 光面注浆界面的凹凸深度小于2 mm.试验结果表明:接缝试件均发生剪切破坏; 试件的荷载-滑移曲线可分为弹性、滑移、极限和破坏四个阶段; 叠合接缝的抗剪刚度为注浆接缝的6.02～6.76倍; 各注浆接缝的抗剪刚度接近,相差不超过10.9%; 叠合接缝的抗剪承载力为注浆接缝的1.38～1.85倍; 齿槽注浆、凿毛注浆接缝的抗剪承载力分别比光面注浆接缝高33.5%和14.9%; 提高界面粗糙度或设置齿槽可增强接缝的抗剪性能.基于试验结果和以往文献中的试验数据,分析了现有接缝抗剪承载力计算方法的适用性.发现现行规范中计算方法对凿毛叠合和齿槽注浆接缝的计算结果大多过于保守,对凿毛注浆和光面注浆接缝的部分计算结果偏于不安全.根据试验数据和对比结果,提出了考虑界面构造影响的预制混凝土柱接缝抗剪承载力计算方法.

Shear tests were conducted on four precast concrete column joint specimens under the axial compression ratio of 0.4 in order to investigate the influence of interface structures on their shear performance. Four specimens had different types of joints, including the grouting joint with rough interface, the grouting joint with shear keys, the grouting joint with smooth interface and the composite joint with rough interface. The depths of the rough interface, shear keys and smooth surface were approximately 6 mm, 20 mm and less than 2 mm, respectively. Results demonstrated that all specimens failed in shear mode. The load-slip curves of the specimens could be divided into four stages, namely the elastic stage, the slipping stage, the ultimate stage and the failure stage. The shear stiffness of the composite joints was 6.02～6.76 times that of the grouting joints. The shear stiffness of three grouting joints was similar, and the difference was nomore than 10.9%. The shear resistance capacity of the composite joints was 1.35～1.85 times that of the grouting joints. And these of the grouting joints with rough interface and shear keys were 33.5% and 14.9% higher than that of the grouting joints with smooth surface. It was concluded that the rough interface and shear keys led to superior shear performance. Based on the test results and the data from the existing research, the analysis was conducted on the applicability of the existing calculation methods for shear resistance capacity of joints. It was found that most existing methods gave conservative results for the grouting joints with shear keys and the composite joints with rough interface, and part of them gave unsafe results for the grouting joints with rough interface and smooth interface. Finally, taking the interface structures into consideration, a calculation method for shear resistance capacity of precast concrete column joints was proposed.

引言
1 试验设计
2 试验结果与分析
3 预制混凝土柱接缝抗剪承载力计算
4 结论

图1 预制混凝土柱接缝的界面构造[4]<br/>Fig.1 Interface structures of precast concrete column joints

图1 预制混凝土柱接缝的界面构造[4]
Fig.1 Interface structures of precast concrete column joints

图2 试件尺寸及配筋<br/>Fig.2 Specimen geometry and reinforcement details

图2 试件尺寸及配筋
Fig.2 Specimen geometry and reinforcement details

图3 试件接缝的界面构造<br/>Fig.3 Interface structures of specimens

图3 试件接缝的界面构造
Fig.3 Interface structures of specimens

图4 试件加载装置
Fig.4 Test setup

图5 试件破坏形态<br/>Fig.5 Failure modes of specimens

图5 试件破坏形态
Fig.5 Failure modes of specimens

图6 接缝试件的荷载-滑移曲线<br/>Fig.6 Load-slip curves of specimens

图6 接缝试件的荷载-滑移曲线
Fig.6 Load-slip curves of specimens

表1 接缝试件的荷载和滑移特征值<br/>Tab.1 Characteristic values of specimens

表1 接缝试件的荷载和滑移特征值
Tab.1 Characteristic values of specimens

图7 预制混凝土构件接缝的抗剪机理[4]<br/>Fig.7 Shear-resistance mechanism of precast concrete joints

图7 预制混凝土构件接缝的抗剪机理[4]
Fig.7 Shear-resistance mechanism of precast concrete joints

表2 ACI 318-19[13]中界面摩擦系数μ的取值<br/>Tab.2 Coefficients of friction μ in ACI 318-19

表2 ACI 318-19[13]中界面摩擦系数μ的取值
Tab.2 Coefficients of friction μ in ACI 318-19

表3 Eurocode 2[15]中界面摩擦系数c和μ的取值<br/>Tab.3 Coefficients of friction c and μ in Eurocode 2

表3 Eurocode 2[15]中界面摩擦系数c和μ的取值
Tab.3 Coefficients of friction c and μ in Eurocode 2

表4 新加坡设计手册(2001)[17]中界面摩擦系数μ取值<br/>Tab.4 Coefficients of friction μ in the Singapore Code

表4 新加坡设计手册(2001)[17]中界面摩擦系数μ取值
Tab.4 Coefficients of friction μ in the Singapore Code

表5 本文试件的接缝抗剪承载力试验值与规范计算值及建议方法计算值的对比<br/>Tab.5 Comparison of the test results in this study with the calculated results from the codes and suggested method

表5 本文试件的接缝抗剪承载力试验值与规范计算值及建议方法计算值的对比
Tab.5 Comparison of the test results in this study with the calculated results from the codes and suggested method

表6 文献[5,9,10,23,24]中接缝抗剪承载力试验值与规范计算值及建议方法计算值的对比<br/>Tab.6 Comparison of the test results in existing studies with the calculated results from the codes and suggested method

表6 文献[5,9,10,23,24]中接缝抗剪承载力试验值与规范计算值及建议方法计算值的对比
Tab.6 Comparison of the test results in existing studies with the calculated results from the codes and suggested method

表7 本文建议的接缝界面摩擦系数μ的取值<br/>Tab.7 Suggested values for friction coefficient μ of interfaces

表7 本文建议的接缝界面摩擦系数μ的取值
Tab.7 Suggested values for friction coefficient μ of interfaces

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备注

引言

1 试验设计

2 试验结果与分析

3 预制混凝土柱接缝抗剪承载力计算

4 结论

期刊信息