高强超薄壁冷弯型钢低层住宅足尺模型振动台试验

进行了两层高强超薄壁冷弯型钢住宅结构足尺模型的振动台试验，模型采用屈服强度550 MPa、厚度2 mm以下超薄壁冷弯型钢龙骨，外墙内外侧覆面板分别采用12 mm厚石膏板和0.42 mm厚屈服强度550 MPa带肋波纹钢板，内墙两侧覆面板均为12 mm厚石膏板。试验选取3条实测地震波记录和1条人工合成地震波，地震加速度考虑7度多遇到9度罕遇的烈度水平。试验结果表明：结构破坏均发生在连接部位和覆面板的局部区域，破坏模式为自攻螺钉的脱落和石膏板的局部破裂，而内部主体型钢龙骨基本无破坏；结构水平刚度虽有较大削弱，但在地震作用下结构无倒塌危险；采用双面覆板构造的复合墙体结构，能够满足抗震设防地区“大震不倒”的要求；墙体开洞部位为结构的薄弱区域，结构设计时应加强门、窗等开洞部位的构造措施以及自攻螺钉连接的可靠性。

Shaking table test on a full-scale model of low-rise high-strength cold-formed thin-walled steel framing buildings

Shaking table test was performed on a full-scale model of two-story residential building, of which the steel framing studs was made of cold-formed thin-walled. steel with material yield strength over 550 MPa and thickness less than 2 mm, with the sheathing panels of 12 mm gypsum boards and 0.42 mm 550 MPa corrugated steel sheets on two sides for outside walls, and 12 mm gypsum boards on both sides for internal walls. Three actual seismic records and one artificial wave were used in the test from frequently occured earthquake level of 7 degree intensity to rare earthquake level of 9 degree intensity. The test results show that, failures of the structure occur at connections and local regions of sheathing panels. The failure modes include pulling-out of self-drilling screws and rupture of local gypsum boards, while the inner steel framing basically stays elastic. Although the structural lateral rigidity degrades greatly after intensity 8 of rare earthquake, the structure doesn’t collapse, which means that the structural system can satisfy earthquake fortification level specified in Chinese code, i.e., structures should not collapse under rare earthquakes. However, Opening regions of composite walls are the weak parts of the whole structure. Full attention should be paid to strengthening the opening regions in structural design, such as windows, doors, etc., and to increasing the reliability of self-drilling screw connections.