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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。
For the occasional eccentricity when calculating the one-way horizontal seismic response of tall buildings, this paper discusses two dynamic calculation schemes of mode decomposition response spectrum method and equivalent torque approximation method. After two examples of eccentricity, The results of the calculation with the twisting period ratio curve. The results show that the equivalent torque approximation method has good calculation accuracy when the lateral twist period ratio is greater than 1.8, compared with the vibration mode decomposition response spectrum method. However, when the lateral twist period ratio is close to 1.0, the internal force may be underestimated, The calculation should be amended to ensure structural design safety.