【摘要】 以跨度为180 m、矢跨比为0.2的三心圆钢管拱桁架结构为研究对象,采用有限元分析软件SAP2000对选用Q345、Q390和Q420三种不同强度钢材的拱桁架进行动力弹塑性分析,分析表明,随着钢材强度的提高,钢管拱桁架用钢量逐渐减少,而其弹塑性界限加速度峰值和破坏界限加速度峰值显著增大,说明采用高强度钢材可显著提高结构的抗震水平。更多还原

【Abstract】 Taking the three-center circular steel tube arch truss structure with a span of 180 m and a rise-span ratio of 0.2 as the research object and using the finite element analysis software SAP2000,this paper studies the dynamic elastoplasticity of the structure with three different strength steels:Q345,Q390 and Q420.The results show that with the increase of steel strength,the amount of steel used in the structure decreases gradually,while the peak values of elastoplastic limit acceleration and failure limit acceleration increase significantly,which indicates that the use of high strength steel can significantly improve the seismic level of the structure.更多还原