摘要
针对苏通引桥建设的实际背景和软弱地基的特点,利用二维有限元整体分析法,对其场地进行了地震反应数值分析。采用等效线性化模型描述土的非线性性质,研究了基岩在一致输入及采用不同行波输入下的场地地震反应特点。计算结果表明,不同的行波速度和行波输入方向,对地表加速度以及相对位移的峰值和相位均有不同程度的影响,对于重要结构来说进行多点地震波输入下的地震反应分析,有助于科学合理地确定结构的地震动输入模式。
By considering the characteristics of soft soils under Su-Tong South Ramp bridge, a representative soft foundation is selected to be investigated. The earthquake response of soft foundation is analyzed with a 2D finite element method and the nonlinear behavior of soil is considered by the equivalent linear method. Our results on earthquake response of soft foundation indicate that different velocity and direction of seismic wave is significant to the peak acceleration value and relative displacement. Under multi-supported excitations, the earthquake response analysis is necessary for the importance structure. It is also very important to determine the model of input seismic wave.
出处
《震灾防御技术》
2007年第2期176-186,共11页
Technology for Earthquake Disaster Prevention
基金
江苏省交通科学研究计划项目
关键词
苏通引桥
地震反应
软弱地基
多点地震输入
Su-Tong ramp bridge
Earthquake response
Soft foundation
Multi-supported excitations
