装配式双钢套管内置高强混凝土组合剪力墙及其试验验证

提出一种适用于高层建筑的新型装配式双钢套管内置高强混凝土(FDSHC)组合剪力墙,并通过试验验证其抗震性能.通过6个两层 FDSHC组合剪力墙试件的压G弯G剪滞回试验和6个单层FDSHC组合剪力墙试件的拉G弯G剪滞回试验,分析试件的破坏特征和滞回性能,研究轴力、钢管混凝土截面含量比、偏心距、外钢管是否焊接对新型墙体抗震性能的影响.结果表明,FDSHC 组合剪力墙试件的破坏形态为弯剪复合破坏,其在压(拉)-弯-剪复合受力作用下具有较高的承载能力,滞回曲线饱满,耗能能力和整体装配性能良好.轴压比越大(轴拉比越小),峰值强度越高;偏心距越大,耗能能力越弱;钢管混凝土截面含量比和外钢管是否焊接的影响不明显.相对于传统装配式混凝土剪力墙,FDSHC组合剪力墙具有“易装配、高承载、低成本”的优点和优越的抗震性能,有望在装配式高层建筑中推广应用.

Fabricated double steel tube-encased and high strength concrete-filled composite shear wall and its test verification

An innovative fabricated double steel tube-encased and high strength concrete-filled (FDSHC) composite shear wall suitable for high-rise buildings is proposed in this study, and its seismic performance is verified by experiments. The failure mode and hysteretic behavior of specimens were analyzed through the compression-bending-shear test of six FDSHC specimens with two stories and the tension-bending-shear test of six FDSHC specimens with a single story. The effects of axial force, section content ratio of concrete-filled steel tube, eccentricity, and the pos-sibility of welded outer steel tube on their seismic performance were studied. Results show that the failure mode of the specimens is a bending-shear composite failure. The specimens have high bearing capacity under the compression (tension)-bending-shear composite loads, demonstrating full hysteretic loops, good energy consumption capacity, and overall assembly performance. A high axial compression ratio (or small axial tension ratio) leads to high peak strength. Meanwhile, a large eccentricity results in a weak energy consumption capacity. The influence of section content ratio and the possibility of welded outer steel tube was not observed. Compared with the traditional prefabricated concrete shear wall, FDSHC composite shear wall has the advantages of easy assembly, high bearing capacity, and low cost. The seismic performance of this composite shear wall is also excellent, which is expected to be popularized and applied in prefabricated high-rise buildings.