【摘要】 将大跨钢管混凝土拱桥———龙潭河大桥简化为空间动力计算有限元模型,以弹簧作为考虑基础 结构相互作用的边界条件,用空间迭代算法程序计算其自振特性,用Wilson θ程序计算其地震作用下空间几何非线性反应.计算结果表明,基础 结构相互作用对各阶频率、轴力和力矩以及跨中位移均有影响.更多还原

【Abstract】 A longspan concrete filled steel tube (CFST) arch bridge, Longtan river bridge, is simplified into a space FEM model to calculate the dynamic responses to seismic an input. In the model, the boundaries between the foundations and the structure are considered to be connected with springs. The natural vibration frequencies are calculated with a space iteration program compiled by the authors, and threedimensional geometric nonlinear seismic responses are analyzed with Wilsonθ method. Calculating results show that the interaction between founders and the structure influences frequencies of all orders considered, axial forces and moments, and midspan displacements. 更多还原