某建筑钢结构减震方案设计研究

DESIGN AND RESEARCH ON SEISMIC REDUCTION SCHEMES FORA STEEL STRUCTURE OF A BUILDING

为了得出效果最好的抗震设计方案,对比分析了罕遇地震下7种不同支撑设置方案的损伤情况、层间位移角等指标,结果表明:在层间位移角改善效果方面,方案C1与普通方案A1相比层间位移角最大值降低了12.4%,且继续向上增加屈曲约束支撑(方案D1~G1)时层间位移角降低幅度仅有略微增加;顶点位移的变化趋势表现为随着逐层增设屈曲约束支撑,其值先减小后逐渐增大的规律,总体上方案D1顶点位移最小,相较于方案A1降低了近17%;屈曲约束支撑和钢连梁的耗能比例随着逐层增设屈曲约束支撑表现出缓慢增加的规律,且方案D1能耗比已较为接近方案G,对比各布置方案的各项指标后,确定最优方案C1为最优方案。

The steel structure system of a super high-rise building is a double-layer resistance combination of a steel frame combined with a steel support tube,and at the same time,buckling constraint braces and steel connecting beams are set as energy dissipation and seismic absorption components.In order to obtain the most effective seismic design scheme,a comparative analysis was conducted on the damage situation,inter story displacement angle,and other indicators of 7 different support settings under rare earthquakes.The results showed that in terms of improving the inter story displacement angle,Scheme C1 reduced the maximum inter story displacement angle by 12.4%compared to the ordinary Scheme A1,and the decrease in inter story displacement angle only slightly increased when buckling constrained supports(Scheme D1~G1)were added upwards;The trend of vertex displacement changes is shown as follows:with the addition of buckling constraint support layer by layer,its value first decreases and then gradually increases.Overall,Scheme D1 has the smallest vertex displacement,which is reduced by nearly 17%compared to Scheme A1;The energy consumption ratio of buckling constrained support and steel connecting beam shows a gradual increase with the addition of buckling constrained support layer by layer,and the energy consumption ratio of Scheme D1 is close to Scheme G.After comparing the various indicators of each layout scheme,the optimal Scheme C1 is determined as the optimal scheme.