NSTS管幕结构横向连接方法试验研究

提出一种基于钢管连接的NSTS(new steel tube slab)管幕结构，在纵向大钢管之间横向布置连接小钢管，浇筑混凝土后形成纵横向复合钢管混凝土整体结构，以解决现有管幕结构施工难度大、横向刚度及承载力低等缺点.通过试验研究不同钢管连接方式对NSTS构件受力性能的影响.结果表明，采用螺栓+T型钢板连接及采用螺栓连接的试件与仅采用T型钢板连接的试件相比，承载力分别提高58.4%，51.2%，刚度分别提高123.3%，97.5%，螺栓+T型钢板的连接方法对NSTS构件的受力性能最为有利;混凝土强度等级对试件的刚度和变形影响较大，对承载力影响不明显.

Experimental Study on Transverse Connection Method of the NSTS Structure

A new steel tube slab(NSTS) structure using small-sized steel tubes as transverse connections was presented in order to ease the construction difficulty and enhance the transverse stiffness and the bearing capacity of the NSTS. Small-sized steel tubes were arranged between the longitudinal steel tubes in transverse direction， forming a composite structure of concrete-filled steel tube after concreting the longitudinal and transverse steel tubes. The connection methods between the transverse tube and the longitudinal tube were studied by analyzing the mechanical behavior of NSTS members. The results indicate that the bearing capacity of the specimen connected by bolts+T-shaped steel plate， and only by bolts is increased by 58.4% and 51.2% respectively， compared with that connected only by T-shaped steel plate， and the stiffness is increased by 123.3% and 97.5%， respectively. The connection method of bolts+T-shaped steel plate is most favorable to the mechanical behavior of the NSTS members. The concrete strength affects the stiffness and deflection of the specimen， but has little impact on the bearing capacity.