论文部分内容阅读
近断层地震动最显著的特点是由方向性效应和滑冲效应引起的脉冲型地面运动。通过建立单自由度体系瞬时输入能计算模型,输入速度脉冲地震记录进行了弹塑性时程分析,计算出地震动对结构的瞬时输入能量,研究了具有速度脉冲型地震动这种荷载形式的瞬时输入能特性及与结构最大位移反应的关系。研究结果表明,对于12次强地震动中109条具有速度脉冲的地震记录,输入结构的最大瞬时输入能总处于速度脉冲发生位置,说明速度脉冲波形对地震动最大瞬时输入能具有决定作用,并由最大瞬时输入能量与结构最大位移反应的对应关系,验证了近断层地震动对结构的破坏作用与速度脉冲有关。此外,与无速度脉冲地震动相比,具有速度脉冲会增大长周期结构的瞬时输入能,并且输入结构的最大瞬时输入能随地面峰值速度(PGV)和峰值加速度(PGA)的比值增大而增大。
The most notable feature of near-fault ground motions is the impulsive ground motions caused by directional effects and skidding effects. Through establishing the model of instantaneous input energy of single-degree-of-freedom system and carrying out the elasto-plastic time-history analysis of the velocity pulse seismic records, the instantaneous input energy of the earthquake to the structure is calculated. The instantaneous moment Input energy characteristics and the relationship between the maximum displacement of the structure. The results show that for the 12 strong earthquakes with 109 velocity pulses, the maximum instantaneous input of the input structure can always be at the location of the velocity pulse, indicating that the velocity pulse waveform is decisive for the maximum instantaneous input of ground motion The corresponding relationship between the maximum instantaneous input energy and the maximum displacement response of the structure shows that the damage of near-fault ground motions to the structure is related to the velocity pulse. In addition, having a speed pulse increases the instantaneous input energy of the long period structure compared to the non-speed pulse ground motion and the maximum instantaneous input energy of the input structure increases with the ratio of the ground peak velocity (PGV) to the peak acceleration (PGA) Increase.