中文摘要：

针对高层建筑计算单向水平地震响应时的偶然偏心,该文讨论了振型分解反应谱法与等效扭矩近似法两种动力计算方案;通过二组算例,给出了偏心后两种方案的计算结果随侧扭周期比的变化曲线。研究表明：与振型分解反应谱法相比,等效扭矩近似法在侧扭周期比大于1.8时具有较好的计算精度,但在侧扭周期比接近1.0时可能低估构件的内力值,在实际计算中应予修正以保证结构设计安全。

英文摘要：

Two dynamical analysis methods are discussed in this paper for an accidental eccentricity during the computation of horizontal seismic responses of tall buildings.They are the modal response spectrum analysis method and the equivalent torque method.The results of two groups of structures demonstrated graphically in terms of the ratio of uncoupled lateral and torsional periods show that the equivalent method has a good precision when the ratio of periods is larger than 1.8.However,it may underestimate member forces if the ratio is close to 1.0.Therefore,a modified approach should be involved in applications.