西安建筑科技大学学报(自然科学版)

以钢纤维体积掺量、套箍系数为变化参数,通过对非约束密实增强混凝土(CRC)和方钢管约束CRC棱柱体短柱进行轴向加载试验,研究了试件的破坏特征、荷载-变形关系、主要特征点指标等,揭示了各变化参数的影响规律.结果表明:方钢管约束CRC的破坏形态为钢管焊缝不同程度的撕裂破坏,焊缝撕裂范围内核心CRC被压碎,其破坏形态完全不同于非约束CRC的剪切型破坏.方钢管约束使得核心CRC轴压强度明显提高,纵向变形性能大大改善.套箍系数对试件轴压力学性能的影响最为显著,而钢纤维体积掺量对试件轴压强度和变形能力的影响较小.

With the steel fiber volume content and confinement coefficient as variable parameters, the axial loading tests were completed on the unconfined compact reinforced composite(CRC)and the square steel tubular confined CRC prismatic stub columns, the failure characteristics, load-deformation relationships and the main characteristic point indexes of specimens were studied, and the influence laws of variable parameters were revealed. The experimental results show that the welds of steel tube were torn in various degree and the core CRC within the weld tearing range were crushed for the square steel tubular confined CRC specimens, whose failure mode are completely different from the shear failure of the unconfined CRC specimens. The axial compressive strength of core CRC significantly increases and the longitudinal deformation performance greatly improves due to the constraint of steel tube. The confinement coefficient has the most significant effect on the axial compression performance of the confined CRC, while the steel fiber volume content has little effect on the axial compressive strength and deformation capacity of confined CRC.

引言
1 试验概况
2 试验结果及分析
3 试件的特征点参数
4 方钢管约束CRC本构模型
5 结论

表1 CRC设计配合比和基本力学性能<br/>Tab.1 CRC design mix proportion and basic mechanical properties

表1 CRC设计配合比和基本力学性能
Tab.1 CRC design mix proportion and basic mechanical properties

表2 钢材物理力学特性<br/>Tab.2 Physical and mechanical properties of steel tube

表2 钢材物理力学特性
Tab.2 Physical and mechanical properties of steel tube

图1 试验装置及测点布置图<br/>Fig.1 Test setup and measuring point arrangement

图1 试验装置及测点布置图
Fig.1 Test setup and measuring point arrangement

图2 非约束CRC试件破坏形态<br/>Fig.2 Failure modes of unconfined CRC specimens

图2 非约束CRC试件破坏形态
Fig.2 Failure modes of unconfined CRC specimens

图3 方钢管约束CRC试件破坏形态<br/>Fig.3 Failure modes of square steel tube confined CRC specimens

图3 方钢管约束CRC试件破坏形态
Fig.3 Failure modes of square steel tube confined CRC specimens

图4 轴向荷载-纵向变形曲线<br/>Fig.4 Axial Load -longitudinal deformation curves

图4 轴向荷载-纵向变形曲线
Fig.4 Axial Load -longitudinal deformation curves

图5 轴向荷载-横向变形系数曲线<br/>Fig.5 Load-transverse deformation coefficient curves

图5 轴向荷载-横向变形系数曲线
Fig.5 Load-transverse deformation coefficient curves

表3 试件的主要特征点参数<br/>Tab.3 Main characteristic parameters of specimens

表3 试件的主要特征点参数
Tab.3 Main characteristic parameters of specimens

表4 本构模型中各参数的取值<br/>Tab.4 Parameters values in constitutive model

表4 本构模型中各参数的取值
Tab.4 Parameters values in constitutive model

图6 A、B值与ξ的关系<br/>Fig.6 Relationship between A, B and ξ

图6 A、B值与ξ的关系
Fig.6 Relationship between A, B and ξ

图7 β与ξ的关系<br/>Fig.7 Relationship between β and ξ

图7 β与ξ的关系
Fig.7 Relationship between β and ξ

图8 η与ξ的关系<br/>Fig.8 Relationship between η and ξ

图8 η与ξ的关系
Fig.8 Relationship between η and ξ

图9 本构模型曲线与试验曲线对比<br/>Fig.9 Comparison between constitutive model curves and test curves

图9 本构模型曲线与试验曲线对比
Fig.9 Comparison between constitutive model curves and test curves

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备注

引言

1 试验概况

2 试验结果及分析

3 试件的特征点参数

4 方钢管约束CRC本构模型

5 结论

期刊信息