摘要
基于有限元数值分析方法研究了哑铃型钢管混凝土(CFST)拱在各种界面状况下的承载能力变化规律,探讨了界面脱粘以及高度脱空率对哑铃型CFST拱承载能力的影响.研究结果表明:1界面脱粘对哑铃型CFST拱的承载能力影响较大,随着界面摩擦系数的降低,承载能力呈降低趋势;2当脱空率较小时,哑铃型CFST拱的极限承载能力下降幅度并不明显,但当脱空率超过20%以后,极限承载能力有一定程度的下降,约为完全粘结时极限承载能力的14%.研究结论可为哑铃型CFST拱的设计和养护提供一定的参考价值.
The bearing capacity of dumbbell-shaped concrete filled steel tube （CFST） arch was studied under a variety of interface conditions using finite element analysis. The effects of separating gap ratio and the interface debonding on the bearing capacity of dumbbell-style CFST arch were investigated. The results show that ： ① the interface separation has a significant impact on the ultimate bearing capacity of dumbbell-style CFST arch ; with the decreasing of friction coefficient, the bearing capacity is reduced; ② the ultimate bearing capacity of the dumbbell-shaped CFST arch does not decrease remarkably when the separation gas ratio is small, however, if the separation gas ratio is over 20%, the ultimate bearing capacity will be decreased by around 14%, compared to that of the arch with fully bonded interface. Present research is valuable for the design and maintenance of dumbbell-shaped CFST arch in engineering application.
出处
《广州大学学报（自然科学版）》
CAS
2015年第1期56-60,共5页
Journal of Guangzhou University:Natural Science Edition
基金
国家自然科学基金资助项目(51378133
51208123)
关键词
哑铃型钢管混凝土拱
界面状况
脱空
承载能力
dumbbell-shaped CFST arch
interface condition
separation
bearing capacity
