研究缩放速度脉冲型地震动强度水平引起的单自由度(SDOF)体系非线性位移反应的偏差。采用30条速度脉冲地震记录，通过SDOF的体系动力时程分析，分析了速度脉冲型地震动分别缩放到不同目标谱加速度(Sa)、峰值加速度(PGA)、峰值速度(PGV)、峰值位移(PGD)水平时，SDOF体系非线性位移反应偏差随系统自振周期和强度折减系数变化的规律；通过对散点数据的对数线性回归确定了位移反应偏差的变化趋势，并比较了不同地面运动强度表征参数下位移偏差的稳定性。分析结果表明：位移偏差对地震动缩放系数、系统的基阶自振周期和系统的强度有一定的依赖性，合理选用缩放系数和地面运动强度表征参数能有效减小估算结构地震位移响应的偏差。

Nonlinear displacement biases in response of single-degree-freedom-systems (SDOF) are studied, which are resulted from scaling the velocity pulse-like ground motion records. Based on dynamic time (history) analysis of SDOF systems subjected to 30 pulse-like ground motions, this work investigates the variation rules of the nonlinear displacement biases versus structural vibration period (T) and strength reduction factor (R) after scaling the earthquake records to the levels of target spectral acceleration (Sa), peak ground acceleration (PGA), peak ground velocity (PGV), and peak ground displacement (PGD). The variation trends of displacement biases are determined by log-linear regression of scattered points, and the stability of the biases under the condition of scaling different ground motion intensity measures are comparatively analyzed. The results demonstrate that the amount of displacement biases greatly depend on the scaling factor, the first-mode period of vibration, and overall strength of the structure. Reasonable scaling factor and reasonable ground motions intensity measuring parameter of the velocity pulse-like ground motion records can effectively reduce the calculated displacement bias in structural earthquake responses.