摘要
以北京市顺义区跨顺白路钢结构人行景观天桥为研究对象,从景观和结构设计两方面对人行天桥进行分析,将其特有的“生态美”造型作为切入点,介绍了其景观设计方案的合理性;在有限元软件中,建立全桥整体模型,通过比较在螺旋梯道与钢箱主梁不同连接形式和结构上、下部不同约束条件和结构主梁梁高不断增大的前提下,结构强度、刚度和基频的变化,从而确定了合理的结构形式,进而采用时程分析,对人行景观天桥整体进行了舒适度评价。研究结果表明:结构梁高1.2m、螺旋梯道与主梁刚性连接和上、下部采用墩梁固接时,人行天桥满足结构安全性和舒适性的要求;随着梁高的不断增高,结构强度与刚度不断增大,结构基频则不断提高;人行天桥在进行舒适度评价设计时,同时需要判断横向1阶频率、竖向1阶和竖向2阶频率是否处于舒适度敏感范围,否则需要进行舒适度分析。
Taking the steel structure landscape pedestrian bridge across Shunbai Road as the researched object,the pedestrian bridge is analyzed from two aspects of landscape and structural design.Started from its unique"ecological beauty"shape,the rationality of its landscape design plan is introduced;An overall bridge model is established by finite element software.Under the premise of different connection forms of the spiral staircase and the steel box main girder,different constraint conditions of the upper and lower parts of the structure,continuous increase of height of the structural main beam,the changes of structural strength,rigidity and fundamental frequency are compared so as to determine the reasonable structure design.The comfort of the pedestrian landscape bridge is evaluated by time history analysis.The results show that the bridge meets the requirements of structural safety and comfort when the structural beam is 1.2 m high,the spiral staircase is rigidly connected to the main beam and the upper and lower parts are fixed by pier beams.With the continuous increase of beam height,structural strength and rigidity and structural fundamental frequency are increasing;During the comfort of pedestrian bridge is evaluated,it is necessary to judge whether the horizontal first-order frequency,vertical first-order and second-order frequency are in the comfort-sensitive range or not.Otherwise,comfort analysis is required.
作者
王犇
程京伟
Wang Ben;Cheng Jingwei(Beijing General Municipal Engineering Design&Research Institute Co.,Ltd.,Beijing 100082,China)
出处
《市政技术》
2021年第5期46-51,共6页
Journal of Municipal Technology
关键词
人行景观天桥
时程分析
约束条件
舒适度分析
landscape pedestrian bridge
time history analysis
constraint condition
comfort analysis
