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研究了某异型钢结构主塔斜拉桥的动力特性及地震响应.结合涡河三桥水滴形钢结构主塔斜拉桥的工程设计实例,采用大型有限元程序ANSYS建立整桥的等效梁索计算模型,研究了整桥的自振动力特性.选用ELCentro地震波输入,采用时程分析法对主塔进行了地震响应分析.结果表明:主梁、主塔的横桥向抗弯刚度较顺桥向小,主塔竖向刚度较大;在三向地震波激励下主塔的横桥向、顺桥向、竖向位移以及钢-混结合处的弯矩均能满足要求.研究结果为其抗震设计与施工提供了参考.
The dynamic characteristics and the seismic response of a profiled steel cable-stayed bridge are studied.Combined with the engineering design example of the drop tower-shaped steel structure main tower cable-stayed bridge of the Third River Bank, a large-scale finite element program ANSYS is used to establish the equivalent beam The seismic response of the main tower is analyzed by using the time history method.The results show that the transverse bridge bending stiffness of main girder and main tower is more than that of the main tower The bridge is small, and the vertical stiffness of the main tower is large; under the excitation of three-direction seismic waves, the transverse bridge, the bridge, the vertical displacement and the bending moment at the steel-concrete hybrid can meet the requirements. The results are Seismic design and construction provides a reference.