装配式轻型钢管框架-轻墙共同工作性能

Experimental study of joint work characteristic of assembly light steel tube frame with recycled concrete-thin wall

提出一种适用于低层或多层农房建筑的装配式轻型钢管再生混凝土框架-轻墙结构,框架由轻型钢管再生混凝土梁、柱及连接节点螺栓连接而成,轻墙为单排配筋再生混凝土薄墙板,框架与轻墙之间通过构造钢板进行螺栓连接,形成共同工作的受力体系.框架承担主要竖向荷载,同时与轻墙共同工作提供水平抗侧力.为研究钢筋间距、墙体厚度对装配式轻型钢管再生混凝土框架-轻墙结构中框架与墙体共同工作性能的影响,进行了4个装配式轻型钢管再生混凝土框架-轻墙试件及1个空框架试件的低周反复荷载试验,分析了配筋间距、墙体厚度对试件损伤演化过程、滞回特性、承载力、延性、刚度以及耗能性能的影响.结果表明:轻型钢管再生混凝土框架-轻墙结构具有良好的共同工作性能,有明确的两道抗震防线;轻墙破坏形态为剪切破坏,随后框架压弯破坏,装配式连接构造安全可靠,结构具有良好的延性;缩小配筋间距、增加墙体厚度可提高轻型钢管再生混凝土框架-轻墙结构的延性和耗能能力.

Assembly light steel tube frame with recycled concrete-thin wall was proposed, which was suited for lower or multilayer floors farmhouse. Assembly frame was assembled by recycled concrete filled light steel tube beams and columns, and light wall adopted single row of steel bars and recycled concrete. Frames and walls were connected by bolts. The frame bears the vertical load and resists the horizontal load with walls together. Pseudostatic tests on 4 assembly light steel frame-thin wall and 1 single frame were conducted to study the influence of reinforcement spacing and the wall thickness on the joint work performance of frames and walls. Failure modes, hysteresis property, load-carrying capacity, ductility, stiffness and energy dissipation capacity of specimens with different bar spacing and wall thickness were analyzed. The results indicate that light steel frame-thin wall distinctly has two seismic defensive lines and works together well. The failure modes of walls are the shear failure and the frame are the axial-flexural failure, respectively, which indicate that the assemble components are safe and reliable and the structure has adequate ductility. Reducing spacing of bars or increasing thickness of the wall can improve ductility and dissipation capacity of specimens.