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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。
The shaking table test of full-scale model of two-story high-strength and ultra-thin-wall cold-formed steel residential structure was carried out. The model adopted ultra-thin wall cold-formed steel keel with yield strength of 550 MPa and thickness of 2 mm. The inner and outer cladding panels were respectively 12 mm Thick gypsum board and 0.42 mm thick yield ribbed corrugated steel plate 550 MPa, both sides of the inner wall cladding panels are 12 mm thick gypsum board. The experiment selected three measured seismic wave records and one synthetic seismic wave, and the seismic acceleration considered 7 degrees more than the intensity rarely encountered at 9 degrees. The experimental results show that the structural failure occurs in the connecting area and in the local area of the covering panel. The failure modes are the falling off of the self-tapping screws and the local rupture of the gypsum board. However, the internal main steel keel is basically not damaged. , But the structure does not collapse under the action of earthquake. The composite wall structure with double-sided sheathing can meet the requirement of earthquake-proof area “big earthquake does not fall”; the opening area of the wall is the weak area of the structure, Structural design should be strengthened doors, windows and other openings in the construction measures and self-tapping screw connection reliability.