上承式钢管混凝土拱桥的时程反应分析

随着钢管混凝土这种组合材料应用于工程实践,拱桥的跨越能力取得了长足的发展,文中以某主跨180m,宽跨比为1/25.7的上承式钢管混凝土拱桥初步设计为例,详细分析了该桥的自振特性和时程反应.结果表明：由于该桥的宽跨比小于1/20,对长周期的地震波的响应较大;桥梁静动力性能可以满足规范要求.

Time-History Analysis of a Steel Pipe Concrete Arch Bridge

With the application of the composition material-concrete-filled-steel tube(CFST) in civil engineering,the crossing ability of arch bridge get advanced development.For long-span and small width-span ratio arch bridge,this paper studies the dynamic characteristics and seismic response of a CFST arch-bridge,which main span is 180 meters,width-span ratio is 1/25.7,also studies the dynamic characteristics of main arch ring and bridge earthquake time-history response.The results indicate that the bridge responses are more violent for long-periodic seismic wave because the width-span ratio is less than 1/20,and the bridge static criterion strength &.dynamic strength is fit to code's standard.