西安建筑科技大学学报(自然科学版)

钢管混凝土柱由于受压力学性能良好、施工方便,已经在土木工程结构中大量使用.耐腐蚀及耐火性能较差,轴压时钢管易向外局部屈曲是其主要不足.ECC(Engineered Cementitious Composite)是一种具有多裂缝开展和应变硬化特征的纤维增强水泥基复合材料,具有延性好、韧性高、耐久性好等优点.用带纤维编织网增强ECC层来加固钢管混凝土结构,可克服上述不足(耐火性能不足、钢管易屈曲),同时也增加钢管混凝土的耐久性性能.由此,针对纤维编织网增强ECC层加固钢管混凝土柱进行了系列研究.本文介绍带纤维编织网增强ECC层加固钢管混凝土柱常温下轴压力学性能试验研究结果.后续还研究了高温对带纤维编织网增强ECC层加固钢管混凝土柱受压力学能的影响,相关研究成果将另文介绍.

Concrete-filled steel tubular(CFST)columns have been widely used in civil engineering structures due to their good compressive mechanical properties and construction convenience. However, their corrosion resistance and fire resistance are poor, and the steel tube is prone to outward local buckling under axial compression. ECC(engineered cementitious compositeengineered cementitious composite)is a fiber-reinforced cement-based composite with the characteristics of multi-cracking and strain hardening(after cracking), which has the advantages of good ductility, high toughness and excellent durability. Therefore, strengthening the CFST column with textile-reinforced ECC(TR-ECC)layer can overcome the above shortcomings, and enhance the durability of CFST. Based on this concept, a series of studies have been carried out in the authors' research group on the compression behavior of CFST strengthened by the TR-ECC layer. In this paper the test results of the axial compression behavior of CFST strengthened by TR-ECC layer at ambient temperature are presented, while the influence of higher temperature on the compressive mechanical properties of CFST strengthened by TRECC layer has been also studied, and the related research results will be introduced in another paper.

引言
1 试验概况
2 试件破坏过程及破坏模态
3 荷载-位移曲线
4 关键结果分析及讨论
5 结论

表1 试件主要参数<br/>Tab.1 Main parameters of specimens

表1 试件主要参数
Tab.1 Main parameters of specimens

图1 试验试件截面图示意图<br/>Fig.1 Section diagram of test specimen

图1 试验试件截面图示意图
Fig.1 Section diagram of test specimen

图2 试件浇筑过程示意图<br/>Fig.2 Process of casting specimen

图2 试件浇筑过程示意图
Fig.2 Process of casting specimen

表2 混凝土材料性能<br/>Tab.2 Material properties of concrete

表2 混凝土材料性能
Tab.2 Material properties of concrete

表3 ECC材料性能<br/>Tab.3 Material properties of ECC

表3 ECC材料性能
Tab.3 Material properties of ECC

表4 钢材材料性能<br/>Tab.4 Material properties of steel

表4 钢材材料性能
Tab.4 Material properties of steel

图3 加载装置图
Fig.3 Test set-up

图4 测点布置<br/>Fig.4 Arrangement of measuring points

图4 测点布置
Fig.4 Arrangement of measuring points

图5 破坏模态图<br/>Fig.5 Photos of failure modes

图5 破坏模态图
Fig.5 Photos of failure modes

图6 荷载-位移曲线<br/>Fig.6 Load-displacement curves

图6 荷载-位移曲线
Fig.6 Load-displacement curves

图7 最大荷载柱状图<br/>Fig.7 Bar chart of maximum loads

图7 最大荷载柱状图
Fig.7 Bar chart of maximum loads

图8 最大荷载对应位移柱状图<br/>Fig.8 Bar chart of displacements corresponding to maximum load

图8 最大荷载对应位移柱状图
Fig.8 Bar chart of displacements corresponding to maximum load

图9 延性系数柱状图<br/>Fig.9 Bar chart of ductility coefficients

图9 延性系数柱状图
Fig.9 Bar chart of ductility coefficients

表5 关键试验结果
Tab.5 Key test results

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备注

引言

1 试验概况

2 试件破坏过程及破坏模态

3 荷载-位移曲线

4 关键结果分析及讨论

5 结论

期刊信息