西安建筑科技大学学报(自然科学版)

对5组共10个采用Q690钢材和C120混凝土的高强锥形中空夹层薄壁钢管混凝土(THSTW-CFDS)轴压短柱进行试验研究,试验参数为内、外钢管径厚比、空心率以及是否配置纵向加劲肋.结果表明:随着空心率和内、外钢管径厚比增加,试件极限承载力降低; 带肋试件和无肋试件相比,空心率为0.72时,极限承载力提高约7.2%; 空心率为0.82时,极限承载力提高约7.5%; 空心率为0.85时,极限承载力提高约10.9%.利用有限元软件ABAQUS对THSTW-CFDST轴压短柱进行数值模拟,并对其进行轴心受压全过程分析.THSTW-CFDS轴压短柱的受力全过程包括弹性阶段、弹塑性阶段和塑性下降阶段.提出了适用于带纵向加劲肋THSTW-CDFS轴压短柱的承载力计算公式,公式计算结果与试验结果吻合较好.

A total of 10 high strength tapered thin walled concrete-filled double skin steel tubular(THSTW-CFDST)stub columns under axial compression with Q690 steel and C120 concrete were tested in five groups, and the test parameters were the diameter-to-thickness ratio of internal and external steel pipes, the hollow ratio and longitudinal stiffeners. The results showed that with the increase of the hollow ratio and the diameter-to-thickness ratio of the inner and outer steel pipes, the ultimate load bearing capacity of the specimen decreased. Compared with the ribbed specimens, when the hollow ratio was 0.72, the ultimate load bearing capacity of the specimens without ribs increased by about 7.2%, when the hollow ratio was 0.82, the ultimate load bearing capacity increased by about 7.5%, and when the hollow ratio was 0.85, the ultimate load bearing capacity increased by about 10.9%. The finite element software ABAQUS was used to numerically simulate THSTW-CFDST stub columns under axial compression, and the whole process of axial compression was analyzed. The results showed that the whole process of this component under axial compression included the elastic stage, the elasto-plastic stage and the plastic descending stage. Finally, the formula for calculating the axial bearing capacity of the longitudinal stiffeners reinforced THSTW-CFDST stub columns member was proposed, and the calculation results of the formula were in good agreement with the test results.

引言
1 试验概况
2 试验结果与分析
3 有限元分析
4 承载力计算公式
5 结论

图1 试件截面示意图<br/>Fig.1 Sections of specimens

图1 试件截面示意图
Fig.1 Sections of specimens

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

表1 试件主要参数
Tab.1 Parameters of specimens

图2 试件整体示意图<br/>Fig.2 Overall of specimens

图2 试件整体示意图
Fig.2 Overall of specimens

图3 试件制作过程<br/>Fig.3 Specimen processing process

图3 试件制作过程
Fig.3 Specimen processing process

表2 钢材材性实测<br/>Tab.2 Mechanical properties of steel

表2 钢材材性实测
Tab.2 Mechanical properties of steel

表3 混凝土材性实测<br/>Tab.3 Mechanical properties of concrete

表3 混凝土材性实测
Tab.3 Mechanical properties of concrete

图4 加载装置
Fig.4 Test setup

图5 测点布置<br/>Fig.5 Layout of measurement points

图5 测点布置
Fig.5 Layout of measurement points

图6 试件破坏形态<br/>Fig.6 Failure patterns of specimens

图6 试件破坏形态
Fig.6 Failure patterns of specimens

图7 混凝土破坏形态<br/>Fig.7 Failure patterns of concrete

图7 混凝土破坏形态
Fig.7 Failure patterns of concrete

图8 荷载-位移曲线<br/>Fig.8 Load-displacement curves

图8 荷载-位移曲线
Fig.8 Load-displacement curves

表4 轴承承载力试验值<br/>Tab.4 Ultimate strengths of specimens under axial compression

表4 轴承承载力试验值
Tab.4 Ultimate strengths of specimens under axial compression

图9 试件ZY-2A荷载-应变曲线<br/>Fig.9 Load-strain curves of ZY-2A

图9 试件ZY-2A荷载-应变曲线
Fig.9 Load-strain curves of ZY-2A

图10 试件ZY-2B荷载-应变曲线<br/>Fig.10 Load-strain curves of ZY-2B

图10 试件ZY-2B荷载-应变曲线
Fig.10 Load-strain curves of ZY-2B

图11 模型网格划分<br/>Fig.11 Mesh generation of models

图11 模型网格划分
Fig.11 Mesh generation of models

图12 有限元与试验荷载-位移曲线对比<br/>Fig.12 Comparison of load-displacement curves between FEA and test

图12 有限元与试验荷载-位移曲线对比
Fig.12 Comparison of load-displacement curves between FEA and test

图13 有限元与试验破坏形态对比<br/>Fig.13 Comparison of failure patterns between FEA and test

图13 有限元与试验破坏形态对比
Fig.13 Comparison of failure patterns between FEA and test

图14 典型N-Δ关系曲线<br/>Fig.14 Typical N-Δ curves of specimen

图14 典型N-Δ关系曲线
Fig.14 Typical N-Δ curves of specimen

图15 钢管鼓曲处钢管与混凝土之间的相互作用力<br/>Fig.15 Interaction between steel tube and concrete

图15 钢管鼓曲处钢管与混凝土之间的相互作用力
Fig.15 Interaction between steel tube and concrete

图16 屈服荷载时各部件应力(A点)<br/>Fig.16 Stress distribution of each component under yield load(A)

图16 屈服荷载时各部件应力(A点)
Fig.16 Stress distribution of each component under yield load(A)

图17 极限荷载时各部件应力(B点)<br/>Fig.17 Stress distribution of each component under ultimate load(B)

图17 极限荷载时各部件应力(B点)
Fig.17 Stress distribution of each component under ultimate load(B)

图18 破坏荷载时各部件应力(C点)<br/>Fig.18 Stress distribution of each component under failure load(C)

图18 破坏荷载时各部件应力(C点)
Fig.18 Stress distribution of each component under failure load(C)

表5 轴压承载力计算值与试验值对比<br/>Tab.5 Comparison of axial compressive bearing capacity between test results and theoretically calculated results

表5 轴压承载力计算值与试验值对比
Tab.5 Comparison of axial compressive bearing capacity between test results and theoretically calculated results

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备注

引言

1 试验概况

2 试验结果与分析

3 有限元分析

4 承载力计算公式

5 结论

期刊信息