摘要
为评估人行桥人致振动响应,提出一种基于有限元理论的人-桥竖向相互作用有限元分析方法,探究行人不同质量、步频及人行桥不同单位长度质量、刚度、阻尼比下的人行桥人致振动响应变化特点,分析参数敏感性。结果表明:随着所承载人体质量的增大,人行桥跨中1 s均方根加速度a_(1)逐渐增大,与SMD模型相比,MF模型作用下人体质量增大对a_(1)影响更为显著;随着步频逐渐增大,a_(1)先增大后减小;随着人行桥单位长度质量及刚度的不断增大,a_(1)先增大后减小;随着人行桥阻尼比的增大,a_(1)逐渐减小。在行人不同质量、步频及人行桥单位长度质量、刚度变化影响下,人行桥跨中a_(1)对人行桥阻尼比参数变化更为敏感。
This paper aims to evaluate the influence of different parameters on the human-induced vibration response of footbridge and does this by developing a finite element theory-based finite element analysis method for human-bridge vertical interaction.The study investigates the law underlying the variations in human-induced vibration response on a pedestrian bridge subjected to different pedestrian mass,step frequency,different unit length mass,stiffness,and damping ratio of footbridge,and analyzes the sensitivity of parameters.The results show thatm,along with the increasing human body mass comes a gradual increase in the 1 s root mean square acceleration value a_(1)in the midspan of the footbridge and,in which case,the increase of human body mass has a more significant impact on the a_(1)value under the action of the MF model than that of the SMD model;there comes an initial increase and a subsequent decrease in the a_(1)value along with a gradual increase in step frequencies means;an initial increase and a subsequent decrease in the a_(1)value following the continued increase in the mass and stiffness per unit length of the footbridge;and a gradual decrease in the a_(1)value with an increase in damping ratio of the footbridge produces.It follows that when subjected to the influence of varying pedestrian mass,step frequency,mass per unit length,and stiffness of the pedestrian bridge,the midspan a_(1)value of the footbridge is more sensitive to the variations of the pedestrian bridge damping ratio parameter.
作者
王涛
陈丹丹
孟丽岩
郑欢
Wang Tao;Chen Dandan;Meng Liyan;Zheng Huan(School of Architecture & Civil Engineering, Heilongjiang University of Science & Technology, Harbin 150022, China)
出处
《黑龙江科技大学学报》
CAS
2021年第2期209-215,共7页
Journal of Heilongjiang University of Science And Technology
基金
国家自然科学基金项目(51978213,52078398)。
