黄埔老港区深厚软土地基对场地抗震的影响

Influence of Soft Foundation on Seismic Resistance in Huangpu Port

利用FLAC3D软件模拟黄埔老港区的深厚软土场地,对地下结构进行动力响应的数值模拟,通过监测结构的位移和加速度,定量分析震动荷载对其产生的影响。研究表明:地震荷载作用期间,可以近似认为在地下结构的柱间产生了一对等大反向的力矩,在其正截面产生拉应力或在斜截面产生剪应力,导致柱发生相对位移从而引起开裂、倒塌。在后期的改造工程中应特别注意地下结构中柱的抗震构造措施,合理设计柱的截面尺寸,宜在柱中部加密箍筋,提高配筋率,保障柱有足够的延性。

Use FLAC^3D to simulate the soft foundation of Huangpu Port,calculate the numerical simulation of dynamic response,analyze the impact of vibration load by monitoring the displacement and acceleration of the structure.Study shows that during the seismic load,it can be approximately considered that a pair of equal opposite torques are generated between the columns,which leads to the relative displacement of the columns and causes the cracking and collapse.In the later reconstruction project,the section size of the column should be designed reasonably,and the stirrup should be encrypted in the middle of the columns,to ensure the column has enough ductility.