Ⅰ型缝CCA板填充墙钢框架试验和有限元分析

Experimental Study and Finite Element Analysis on the Mechanical Properties of Ⅰ-Shaped CCA Sheets In-filled Steel Frame Structures

为减缓侧向荷载作用下CCA板填充墙的开裂,在墙板中间设了Ⅰ型竖向缝,并对一榀足尺的单层单跨带Ⅰ型竖缝的CCA板填充墙钢框架进行低周反复荷载试验,还设计了一榀足尺纯钢框架、一榀足尺的常规带CCA板填充墙钢框架与之对比,主要研究带Ⅰ型竖缝CCA板填充墙的开裂过程及破坏规律,以及竖缝对试件的滞回性能、变形能力、刚度退化和耗能能力的影响,并将试验结果与有限元模拟结果进行比较。研究结果表明:与常规CCA板填充墙钢框架相比,带Ⅰ型竖缝能有效延缓CCA板填充墙在弹塑性阶段的开裂,使墙板应力集中得到缓解。研究结果可为Ⅰ型缝CCA板填充墙钢框架的应用推广提供试验与理论依据。

In order to mitigate the cracking of CCA sheets under lateral load,one vertical slit is set in the middle of the wallboard,namely I-shaped CCA sheets.A single-story and single-span of full-scale I-shaped CCA sheets in-filled steel frame is tested under low cyclic loading.Also,one bare steel frame structure and one steel frame filled with CCA sheets in conventional constructional measures are designed and tested,to compare with I-shaped CCA sheets in-filled steel frame.Cracking process and failure rule of I-shaped CCA sheets are studied,as well as the effect of the vertical slit on the load-displacement hysteretic curves,the deformation capacity and stiffness degradation,energy dissipation of the specimen.The test data is also compared with the finite element simulation results.Experimental studies show that the vertical slit with constructional measures can delay the cracking of CCA sheets effectively,and reduce the stress concentration at elastic-plastic stage.Research results will provide a reference for the development of I-shaped CCA sheets in-filled steel frame structures.