大理某大跨度贯木拱桥仿真分析
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赵聪(1996—),男,昆明理工大学硕士生

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TU366.2

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国家自然科学基金地区项目(51168025);科技支撑计划课题(2013BAK13B01);云南省教育厅科学研究基金项目(2019J0194)


Numerical study on a large span timber arch bridge in Dali city
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    摘要:

    新建的大理某大跨度人行木桥为采用传统榫卯节点连接的三跨贯木拱结构体系,为验证该拱桥的结构安全性和舒适性,利用SAP2000有限元软件对该结构进行了模态分析、静力分析,对最不利荷载组合情况下的主要受压构件进行验算。研究结果表明:在地震荷载和风荷载作用下,人行桥具有良好舒适性,避开了人行荷载谐波的基频范围,不易发生明显的人致共振现象。风荷载不是控制结构安全性的主要因素。加支撑后的拱桥整体强度应力处于安全状态,最大应力发生在拱脚附近区域。最不利荷载组合作用下,主要构件承载能力满足要求。本工程的设计可供同类工程参考。

    Abstract:

    A new large-span timber footbridge located in Dali city was designed by three-span timber arch structure system connected by traditional mortise ten on joints. In order to prove the structural safety and comfortability of the arch bridge,the modal analysis and static analysis of the structure were conducted by using a finite element software SAP2000,the stability of main loaded members under the most unfavorable combined loading condition was checked. The analysis results show that the pedestrian bridge has good comfort under seismic load and wind load and avoids the fundamental frequency range of pedestrian load harmonic,such that the obvious phenomenon of syntony induced by walk hardly occurs. The wind load is not the main factor controlling the structure safety. The overall stress of the supported arch bridge is in a safe state,the maximum stress occurs near the arch foot. Under the worst combined loading condition,the main loaded components meet the safe requirements. The design of this project can provide a reference for similar engineering.

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  • 在线发布日期: 2022-06-06
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