PDF全文阅读

付志君^{1 , 2}  ,   罗   柱¹  ,  冯    鹏²

 

(1 .  广东省建筑科学研究院集团股份有限公司 ，广东 广州 510500;  2.  清华大学 土木水利学院 ，北京 100084)

摘   要 ：铝合金人行天桥因质量轻 、强度高 、经久耐用等优势而得到广泛应用，传统的天桥结构设计方法 存在分析模型过度简化导致结果偏差较大的问题。基于此，本文给出了一种装配式铝合金人行天桥的结构设计方法 ，用于提高结构设计分析结果的准确性和可靠性。以珠海市某天桥为例，建立该天桥的精细化有限元分析模型 ，并对其强度 、刚度和自振频率进行验算。结果表明：基本组合荷载作用下桁架梁的应力最大，且最大拉应力和最大压应力分别为设计强度的 15. 5% 和 14%, 人群荷载与恒载作用下桁架梁的应力接近；天桥的最大挠 度为最大竖向挠度允许值的28% ,  天桥的宽跨比是最小允许宽跨比的3 . 8 倍；天桥侧向和竖向固有频率分别为最小允许值的 1 . 92 倍和 1 . 87 倍，均满足规范要求。

关键词：装配式 ；铝合金 ；天桥 ；结构设计 ；性能

中图分类号：TU997           

文献标志码：A            

文章编号： 1005- 8249   (2024)  04- 0117- 06 

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.04.021

 

FU Zhijun^{1 , 2}  ,  LUO Zhu¹  ,  FENG Peng²

( 1 . Guangdong Provincial Academy of Building Research Group Co. ，Ltd. ，Guangzhou 510500 ,  China;

2. School of Civil Engineering ,  Tsinghua University ,  Beijing 100084 ,  China)

Abstract: Aluminum alloy pedestrian overpasses have been widely used due to their advantages of light weight, high strength, and durability. However, traditional bridge structure design methods suffer from the problem of excessive simplification of analysis models, leading to significant deviation in results. To this end, this paper introduces a method for the structural design of the prefabricated aluminum pedestrian bridge Taking a certain pedestrian bridge in Zhuhai as an example, a refined finite element analysis model of the bridge was established, and its strength, stiffness, and natural frequency were verified. The results showed that the stress of the truss beam was the highest, and the maximum tensile stress and maximum compressive stress were 15.5% and 14% of the design strength respectively, under the basic combination load. The stress of the truss beam under crowd load and dead load was similar; The maximum deflection of the overpass was 28% of the maximum allowable vertical deflection, and the width to span ratio of the overpass was 3.8 times the minimum allowable width to span ratio; The lateral and vertical natural frequencies of the pedestrian bridge were 1.92 times and 1.87 times the minimum allowable values, respectively, all of which met the requirements of the specifications.

Keywords:  prefabricated; aluminum; bridge; structural design; performance

*基金项目： 国家自然科学基金联合基金项目资助  (U2106219) ;  国家自然科学基金面上项目资助  (51978379) 。

 作者简介：付志君  (1990—) ,  男 ，博士（ 后），研究方向：韧性城市 、智慧水利等。

收稿日期：2023- 12- 02