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斜向地震作用是影响框架结构“强柱弱梁”破坏机制的重要因素之一,现行抗震规范钢框架强柱系数没有考虑斜向地震作用的影响。对框架节点受力分析表明:斜向地震作用时实现“强柱弱梁”的强柱系数应大于2~(1/2)。通过对钢框架模型的振动台试验和有限元数值模拟,研究了主轴方向强柱系数1.35的钢框架的破坏机制,表明在主轴方向地震作用下实现了强柱弱梁,而在斜向地震作用下,钢框架发生柱端破坏。建议钢框架结构抗震设计应考虑斜向地震作用的影响。
The diagonal seismic effect is one of the important factors that affect the failure mechanism of the frame structure “strong column weak beam”. The strong column factor of the current seismic code steel frame does not consider the influence of the diagonal earthquake. The mechanical analysis of the frame joints shows that the strong column coefficient of “strong column and weak beam” to realize the diagonal earthquake should be greater than 2 ~ (1/2). Through the shaking table test and finite element numerical simulation of the steel frame model, the failure mechanism of the steel frame with a strong column factor of 1.35 in the direction of the main axis is studied, which shows that the strong column weak beam is realized under the earthquake in the direction of the principal axis, Under the column end of the steel frame damage occurred. It is suggested that the seismic design of steel frame structure should consider the influence of oblique earthquake.