摘要
目的 研究新管幕肋梁结构体系抗弯性能,完善新管幕工法结构计算理论.方法 对两组不同截面偏移率的新管幕结构构件进行弯曲性能试验研究,通过两组构件发生弯曲破坏时的破坏形态,确定其开裂荷载和极限承载能力,讨论截面偏移率对构件抗弯性能的影响.结果 对两组构件进行加载破坏后,构件的弯曲破坏特征明显,跨中均产生较大挠度,构件跨中挠度值分别为18.15 mm和18.43 mm,极限承载力分别为680 kN和520 kN.由于构件本身构造原因,NGJ-W-l构件裂缝特征比较明显,NGJ-W-2构件肋梁混凝土大部分包裹在钢管内部,相比较NGJ-W-2构件裂缝特征不明显.结论 与普通混凝土梁相比新管幕结构可以承受更高的竖向荷载,并提高了开裂荷载,同时随着截面偏移率的增大,构件的开裂荷载和极限承载力相应提高,且刚度加大.
Abstract
The paper presents an experimental research on flexural behavior of two groups of new tubular roof(NTR) structures with different deviation ratio of section to improve the analysis theory. The cracking load and bearing capacity of the structure with the two kinds of deviation ratio of section are experimentally determined and the failure modes of the two structures are also discussed. The experimental results show that the flexural failure mode with great deformation in the mid-span is obvious after the failure of the two members. The cracking property for the member of NGJ-W-1 is more obvious than that of the member of NGJ-W-2 because of the construction in detail. Compared with ordinary concrete beam, the NTR structure can resist much higher vertical load and cracking load. Meanwhile, the cracking load and the ultimate bearing capacity are both improved and the stiffness is also increased with the increasing of the deviation ratio of section.
基金项目
住房和城乡建设部研究开发项目(2010-K2-14)
沈阳大型仪器设备共享服务专项基金(090079)
NETL
NSTL
维普
万方数据