【摘要】 采用有限元对地震荷载作用下的新型分离卸荷式板桩码头动力响应开展研究,分析不同强度、不同类型的地震作用对分离卸荷式板桩码头结构内力的影响。计算结果表明:在不同特性地震荷载作用下,前墙-拉杆-锚碇墙和前桩-后桩-卸荷平台均能分别形成相对独立结构体系,保持整体受荷承载。结构最大值内力出现的时刻与地震加速度时程峰值的时刻是不对应的。随着地震峰值加速度的增大,各码头结构的最大内力值都有不同比例的增大,其中前墙弯矩增幅最大,锚碇墙弯矩和拉杆拉力的增幅次之,前桩和后桩的弯矩增幅最小;当地震峰值加速度相等时,Kobe波作用下的各结构最大内力放大系数总是大于El-Centro波作用时的值,结构的动力响应不仅仅与地震时程峰值大小有关,还需充分考虑频谱特性及波能密度等地震荷载特性的影响。更多还原

【Abstract】 Numerical analysis on dynamic responses of the new kind of sheet-pile wharf with separated relieving platform has been made with FEM method, the influences on seismic wave characteristics on dynamic behavior of the new wharf structure have been analyzed in details. The results showed that with the effect of different seismic loads, front wall-tie rob-anchor wall and front pile-back pile-platform worked as independent structure systems respectively, and they carried the additional loads together. When the peak acceleration of earthquake wave appeared, the corresponding internal forces of each structure component were not the maximum values. With the increase of peak ground acceleration, the internal forces were all increased in different agree, the amplification of front wall bending moment was the largest, those of anchor wall bending moment and tie rob tension force were a bit smaller, and those of front pile and back pile bending moments were the smallest. The amplification of each structure component internal force under the Kobe wave was always larger than that under the El-Centro wave, which indicated that the dynamic responses were also related to other seismic load characteristics, such as wave energy density and spectrum, except for wave peak value.更多还原