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付志君^{1 , 2}  ,   羅   柱¹  ,  馮    鵬²

 

(1 .  廣東省建筑科學研究院集團股份有限公司 ，廣東 廣州 510500;  2.  清華大學 土木水利學院 ，北京 100084)

摘   要 ：鋁合金人行天橋因質量輕 、強度高 、經久耐用等優勢而得到廣泛應用，傳統的天橋結構設計方法 存在分析模型過度簡化導致結果偏差較大的問題。基于此，本文給出了一種裝配式鋁合金人行天橋的結構設計方法 ，用于提高結構設計分析結果的準確性和可靠性。以珠海市某天橋為例，建立該天橋的精細化有限元分析模型 ，并對其強度 、剛度和自振頻率進行驗算。結果表明：基本組合荷載作用下桁架梁的應力最大，且最大拉應力和最大壓應力分別為設計強度的 15. 5% 和 14%, 人群荷載與恒載作用下桁架梁的應力接近；天橋的最大撓 度為最大豎向撓度允許值的28% ,  天橋的寬跨比是最小允許寬跨比的3 . 8 倍；天橋側向和豎向固有頻率分別為最小允許值的 1 . 92 倍和 1 . 87 倍，均滿足規范要求。

關鍵詞：裝配式 ；鋁合金 ；天橋 ；結構設計 ；性能

中圖分類號：TU997           

文獻標志碼：A            

文章編號： 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

*基金項目： 國家自然科學基金聯合基金項目資助  (U2106219) ;  國家自然科學基金面上項目資助  (51978379) 。

 作者簡介：付志君  (1990—) ,  男 ，博士（ 后），研究方向：韌性城市 、智慧水利等。

收稿日期：2023- 12- 02