董宏英，陈学鹏，曹万林，叶涛萍
AuthorsHTML:董宏英，陈学鹏，曹万林，叶涛萍
AuthorsListE:Dong Hongying，Chen Xuepeng，Cao Wanlin，Ye Taoping
AuthorsHTMLE:Dong Hongying，Chen Xuepeng，Cao Wanlin，Ye Taoping
Unit:北京工业大学建筑工程学院，北京 100124
Unit_EngLish:College of Architecture and Civil Engineering，Beijing University of Technology，Beijing 100124，China
Abstract_Chinese:针对方钢管混凝土界面黏结强度不足的问题，进行了11种不同构造大尺寸方钢管高强混凝土试件的推出试验. 构造措施包括栓钉构造、竖向肋板构造、拉结钢筋构造、分腔钢板构造以及环向肋板构造等. 通过各种试件的破坏特征、荷载-滑移曲线和应变，得到了不同构造试件的黏结强度、耗能能力与构造效率，揭示了不同构造措施滑移破坏全过程的作用机理，并验算了已有的栓钉构造、环向肋板构造中抗剪件的抗剪强度计算方法. 结果表明：无构造措施的方钢管混凝土试件的荷载-滑移曲线包括上升段和平直段，仅内置竖向构造措施试件的荷载-滑移曲线包括斜率不同的两个上升段，设置抗剪件试件的荷载-滑移曲线在峰值之后出现下降段；环向肋板、竖向肋板和钢筋笼组合构造可使方钢管高强混凝土的黏结强度提高11.2倍，分腔钢板和栓钉组合构造可使方钢管高强混凝土的耗能能力提高10.7倍；栓钉构造在提高方钢管与混凝土界面黏结强度方面构造效率最高，环向肋板构造在提高方钢管与高强混凝土界面耗能能力方面构造效率最高，与单一构造试验值的叠加结果相比，栓钉和环向肋板组合构造的黏结强度提高了7.2%，耗能能力降低了3.2%；用于栓钉构造、环向肋板构造抗剪件的抗剪强度计算方法与试验结果相比偏于安全，可为工程设计提供参考.
Abstract_English:To solve the problem of the insufficient interface bond strength of concrete-filled square steel tubes (CFSSTs)，11 push-out tests of large high-strength CFSST specimens with different constructions(such as studs，vertical ribs，pulling reinforcing bars，steel partitions，and circular ribs)were carried out. Through the failure characteristics，load-slip curves，and strains of each specimen，the bond strength，energy dissipation capacity，and construction efficiency were obtained. The sliding failure mechanism of different constructions was revealed，and existing shear strength calculation methods of CFSST with studs and circular ribs were assessed. The results show that load-slip curves of CFSST specimens with no construction include an ascending section and a straight section；those of CFSSTs with built-in vertical construction include two ascending sections with different slopes；and those of CFSST with shear connectors show a falling section after the peak value. Setting circular ribs，vertical ribs，and reinforcement cage can multiply the bond strength by 11.2，and setting both steel partitions and studs can multiply the energy consumption capacity by 10.7；studs have the highest construction efficiency in improving the interface bond strength of CFSSTs，and circular ribs have the highest construction efficiency in improving the energy dissipation capacity. Compared with the summation of a single construction test value，the bond strength of the combination of studs and circular ribs increases by 7.2%，and the energy consumption decreases by 3.2%. Shear strength calculation methods of studs and circular ribs are more conservative than test results and can provide a reference for engineering design.
Keyword_Chinese:钢管混凝土；高强混凝土；黏结强度；构造；推出试验
Keywords_English:concrete-filled steel tube；high-strength concrete；bond strength；construction；push-out test

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