| 施工初应力作用下内配十字形型钢的圆钢管混凝土
轴压短柱力学性能分析 |
| |
| 引用本文： | 段绍臻,马 钰,史艳莉,王文达.施工初应力作用下内配十字形型钢的圆钢管混凝土
轴压短柱力学性能分析[J].建筑科学与工程学报,2020,0(1):85-93. |
| |
| 作者姓名： | 段绍臻 马 钰 史艳莉 王文达 |
| |
| 作者单位： | (兰州理工大学 土木工程学院,甘肃 兰州 730050) |
| |
| 摘 要： | 利用ABAQUS有限元软件分别建立考虑外钢管施工初应力和同时考虑钢管与型钢施工初应力的内配十字形型钢圆钢管混凝土轴压短柱数值模型,并对建模方法进行验证。计算施工初应力存在时内配型钢钢管混凝土轴压短柱的荷载-位移全过程曲线及其各部件的承载力分配曲线,并分析混凝土与钢管、混凝土与型钢的接触应力及应力发展状态。最后对初应力系数、构件长细比、钢管和型钢的含钢率、钢管和型钢的屈服强度以及混凝土的抗压强度等因素进行了参数分析。结果表明:考虑外钢管施工初应力对内配型钢钢管混凝土轴压构件力学性能的影响规律与其对钢管混凝土轴压构件力学性能的影响规律基本一致; 外钢管和型钢施工初应力的同时存在使混凝土与钢管、型钢的相互作用时间延迟,减弱钢管对混凝土的套箍作用和混凝土对型钢的局部约束,使组合构件提前进入弹塑性阶段并扩大此阶段的范围,导致组合柱极限承载力随着初应力值的增大逐渐减小; 构件长细比对轴压短柱的承载力影响系数有显著影响。
|
| 关 键 词： | 圆钢管混凝土 内配十字形型钢 施工初应力 轴压构件 力学性能 |
Analysis on Axial Compression Mechanical Behavior of Circular Concrete
Filled Steel Tubular Stub Columns with Inner Crossed Profiled Steel
Under Construction Pre-load |
| |
| DUAN Shao-zhen,MA Yu,SHI Yan-li,WANG Wen-da.Analysis on Axial Compression Mechanical Behavior of Circular Concrete
Filled Steel Tubular Stub Columns with Inner Crossed Profiled Steel
Under Construction Pre-load[J].Journal of Architecture and Civil Engineering,2020,0(1):85-93. |
| |
| Authors: | DUAN Shao-zhen MA Yu SHI Yan-li WANG Wen-da |
| |
| Affiliation: | (School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China) |
| |
| Abstract: | Using ABAQUS finite element software, the numerical models of concrete filled steel tubular(CFST)stub columns with inner crossed profiled steel under axial pressure were established, which considered the construction pre-load of outer steel tube and the pre-load of steel tube and section steel construction respectively. And the modeling method was verified. The whole process load-displacement curves and the bearing capacity distribution curves of CFST with inner profiled steel considering construction pre-load were calculated respectively. The stress development state and the contact stresses between concrete and outer tube, concrete and inner crossed profiled steel were analyzed respectively. Finally, the parameters of pre-load coefficient, component slenderness ratio, steel content of tube and profiled steel, yield strength of tube and profiled steel, and compressive strength of concrete were analyzed. The results show that the influence law of the construction pre-load of outer tube on the mechanical properties of axial compression member in CFST with inner profiled steel is the same as that on the common CFST. At the same time of the pre-loads of the outer steel tube and the profile steel, the interaction time of the concrete and the outer tube and the profile steel is delayed, and the sleeve of steel tube on concrete and the local restraint of concrete on profiled steel pipe are weakened, so that the composite member enters the elastoplastic stage in advance and expands the range of the next stage. The ultimate bearing capacity of composite columns decreases with the increase of the pre-load value. The slenderness ratio has a significant effect on the bearing capacity of the axial compression column. |
| |
| Keywords: | circular concrete filled steel tube inner crossed profiled steel construction pre-load axial compression member mechanical behavior |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《建筑科学与工程学报》浏览原始摘要信息 |
|
点击此处可从《建筑科学与工程学报》下载全文 |
|
