考虑结构构造作用的人行天桥自振特性分析

摘要

以某两跨钢结构人行天桥为背景,考虑加劲肋和横隔板对钢箱主梁自振特性的影响,并采用有限元软件建模对钢箱主梁的自振特性进行分析。计算结果表明：考虑加劲肋作用会使结构的自振频率减小;钢箱主梁在大于二倍梁高间距内设置横隔板对提高主梁自振频率有一定的效果。%Based on the background of steel structure passenger foot-bridge with two spans,considering the influence of stiffening rib and diaphragms on natural vibration property of steel box girder,natural vibration property of steel box girder is analyzed through building model by finite element software.The calculation results show that the natural vibration frequency decreases when considering the influence of stiffening rib,the allocation of diaphragm of the steel box main beam in the distance,more than two times of the beam height can have certain effect for improving the self vibration frequency of main beam.