不同强度钢材对钢管拱桁架动力破坏的影响
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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。
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.
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.
引文
[1] 王伟.120 m跨带下部结构钢管拱桁架的基础隔震性能及失效机理分析[D].太原:太原理工大学,2010.
[2] 沈世钊,陈昕.网壳结构动力稳定性[M].北京:科学出版社,1999.
[3] 郭彦林,郭宇飞,窦超.钢管桁架拱平面内失稳与破坏机理的数值研究[J].工程力学,2010,27(11):46-55,63.
[2] 沈世钊,陈昕.网壳结构动力稳定性[M].北京:科学出版社,1999.
[3] 郭彦林,郭宇飞,窦超.钢管桁架拱平面内失稳与破坏机理的数值研究[J].工程力学,2010,27(11):46-55,63.