钢管混凝土框架-整体装配式填充墙抗震性能

为消除填充墙对框架的不利影响,充分发挥钢管混凝土框架变形能力强、延性好的优势,采用在钢管混凝土框架柱与填充墙间预留缝隙,填充墙与型钢梁间柔性连接的构造措施。为验证该种连接的可靠性,研究钢管混凝土柱框架-整体装配式填充墙的抗震性能及相互作用机理,进行了1个足尺单榀两跨两层框架填充墙模型的低周反复荷载试验。基于试验,分析了填充墙的损伤演化过程、钢管混凝土柱框架和连接件的变形及结构整体的抗震性能。研究表明:钢管混凝土柱框架-整体装配式填充墙滞回曲线饱满,耗能能力强;加载点极限移位角达1/41时,整体结构仍具有稳定的承载力,延性较好;装配式填充墙板-框架间的柔性连接,削弱了框架传递给填充墙板的荷载,延缓和减轻了整体装配式填充墙板损伤;填充墙板与装配式钢框架整体连接可靠,发挥了框架变形能力强、延性好的优势;整体结构后期承载能力稳定,具有良好的抗震性能和安全储备。

Seismic performance of concrete filled steel tubular frame with integral assembled infilled wall

To eliminate the adverse effect of the additional rigidity of infilled wall on its frame and make full use of the strong deformation capacity and good ductility of concrete filled steel tubular (CFST) frame, the structural measures of reserving the gaps between CFST column frame and infilled wall as well as the flexible connection between infilled wall and steel beam were adopted. A full-scale two-story two-span frame infilled wall specimen was tested under low frequency repeated loads to verify the reliability of the flexible connection and investigate the seismic performance and interaction mechanism of CFST column frame-integral assembled infilled wall. Based on the test, the damage evolution process of infilled wall, the deformation performance of CFST column frame and connection, and the seismic performance of the structure were analyzed. Results show that the hysteretic curve of the overall structure was full, and the energy dissipation capacity of the structure was strong. When the ultimate displacement angle reached 1/41, the structure still had stable bearing capacity and good ductility. The flexible connection between the assembled infilled wall panel and the frame weakened the load transferred from the frame to the infilled wall panel, and delayed and reduced the damage of the integral assembled infilled wall. The integral assembled infilled wall and fabricated steel frame were connected reliably as a whole by the flexible connection, exerting the advantages of strong deformation capacity and good ductility of the CFST frame. In the later stage, the overall structure exhibited stable bearing capacity, good seismic performance, and safety reserve under earthquake load.