方钢管钢骨混凝土双偏压柱试验研究与有限元分析

Experiment research and finite element analysis of square steel tube columns filled with steel reinforced concrete subjected to bi-axial eccentric compression

进行了9根方钢管钢骨混凝土双向偏压柱试验,研究其破坏形态,分析荷载与纵向应变关系及长细比、加载方向等参数变化对双偏压柱受力性能的影响。结果表明:当荷载达到极限荷载的50%～70%,钢管的受压区开始屈服;当荷载达到极限荷载的80%～90%,钢骨的受压区开始屈服。在试验参数范围内,加载角度的变化对偏压柱的受力性能影响不大。通过有限元法建立计算模型,模型计算结果与试验结果吻合很好。在此基础上,通过变化计算参数,分析了不同长细比、偏心距条件下,加载角度对偏压柱受力性能的影响。结果表明,随着长细比及偏心距的增大,加载角度的变化对双偏压柱受力性能的影响也越来越大。

Experimental research of 9 square steel tube columns filled with steel reinforced concrete subjected to bi-axial eccentric compression was presented.Failure mode and load versus longitudinal strain curves were analyzed.Influence of load direction and slenderness ratio were also analyzed.The test results show that the steel tube begins to yield when load gets to 50%~70% ultimate bearing capacity and the steel reinforced begins to yield when load gets to 80%~90% ultimate bearing capacity.Different angles of loading have little effect on the bearing capacity.Furthermore,a finite element analysis model was established and the calculated results were agreed well with the test ones.Influence of load directions under different slenderness and eccentricity was also analyzed.Results show that the more slenderness and eccentricity the more influence of load direction on the bearing capacity.