钢框架-轻木剪力墙混合结构抗震性能振动台试验研究

为研究钢框架-轻木剪力墙混合结构的抗震性能，设计了缩尺比为2/3的钢木混合结构模型，并对其进行了振动台试验。试验中选取汶川、Canterbury、El Centro和Kobe共4条地震波，并考虑多遇、设防和罕遇3个地震水准，相应的地震加速度峰值分别为0.14g、0.40g和0.80g。通过振动台试验获得了钢木混合结构的地震响应和破坏模式。结果表明：钢木混合结构在多遇地震作用下最大层间位移角为0.15%，罕遇地震作用下最大层间位移角为0.85%，均能满足规范对结构变形的要求；在试验过程中，结构的钢框架部分和钢木连接没有出现损伤，其主要破坏模式表现为轻木剪力墙面板钉节点的破坏，破坏部位主要位于墙体覆面板的边缘；多遇地震作用下，轻木剪力墙承担了结构地震剪力的55.1%以上，有效地提高了结构抗侧承载力；随着输入地震加速度峰值的增大，剪力墙刚度逐渐退化，其分担的地震剪力有所降低，但即使在罕遇地震作用下，轻木剪力墙分担剪力的比例仍能达到39.9%以上。

Experimental study on seismic performance of steel frame and light-frame timber shear wall hybrid structure through shaking table tests

In order to investigate the seismic performance of steel frame and light-frame timber shear wall hybrid structure, a 2∶3 scaled model was designed and tested through shaking table tests. Four earthquake records, i.e. Wenchuan, Canterbury, El Centro and Kobe earthquakes, were adopted in the tests. Three seismic intensities, i.e. frequent, basic and rare earthquakes were also considered, and the corresponding peak ground accelerations were 0.14g, 0.40g and 0.80g, respectively. The seismic responses and the failure modes of the hybrid structure were acquired. The test result indicates that the maximum inter-story drift ratio is 0.15% under frequent earthquakes and reaches 0.85% under rare earthquakes, which satisfies the requirement on deformation of structures in Chinese code. During the tests, the steel frame and the frame-to-wall connections of the structure remained intact, and the main failure mode was the damage to the nailed connection of the light-frame timber shear walls at the edges of the OSB boards. Under frequent earthquakes, more than 55.1% of the seismic shear force was resisted by timber shear walls, which increased the lateral resistance of the structure effectively. With the increase of the seismic intensity, the stiffness of timber shear walls degraded gradually, and the proportion of shear force carried by timber shear walls decreased. However, the shear force in wood shear walls is more than 39.9% of the seismic shear force in the hybrid structure even under major earthquakes.