重载与中强地震联合作用下的曲线独柱墩桥梁倾覆性分析

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摘要为探讨移动车辆和中强地震联合作用对曲线梁桥的抗倾覆影响，建立车-桥-地震分析模型，提出考虑地震作用的曲线梁桥车-桥耦合振动分析方法。以多跨曲线连续梁桥为研究对象，对比分析中强地震和重载车辆偏载组合作用下的支座反力和主梁倾覆时整体转角大小。研究地震动类型、峰值、车辆关键参数等因素对曲线梁桥倾覆稳定性的影响。结果表明：不同车辆和地震荷载组合会改变桥梁的受力情况，纵向间隔2米的3辆100t车辆以3m/s速度行驶时，三跨曲线梁桥的倾覆最明显；综合考虑重载及地震联合作用，对抗倾覆性规范中的稳定系数计算公式进行了修正；分析了五跨曲线梁桥中墩支座偏心距对抗倾覆稳定系数的影响，计算结果表明中墩两相邻支座设置偏心时曲线桥最大抗倾覆系数为1.55。

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	殷新锋1
	方亚茹1
	晏万里1
	黄胄1
	李茂侬1
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关键词 ：曲线梁桥, 中强地震, 移动荷载, 有限元动力分析, 抗倾覆稳定系数

Abstract：To explore the combined effect of mobile vehicles and moderate-strong earthquakes on the anti-overturning effect of curved beam bridges, a vehicle bridge seismic analysis model is established, and a vehicle bridge coupling vibration analysis method considering seismic effects is proposed for curved beam bridges. This research focuses on multi-span curved continuous beam bridges and analyzes the support reaction force and overall turning angle of the main beam during overturning caused by a combination of moderate-strong earthquakes and overload from eccentric vehicle loads. The study also investigates the influence of seismic motion type, peak values, and key vehicle parameters on the overturning stability of curved beam bridges. The results indicate that different combinations of vehicles and seismic loads can change the stress situation of the bridge. When three 100t vehicles with a longitudinal spacing of 2m are driving at a speed of 3m/s, the overturning of the three-span curved beam bridge is most obvious; Revise the formula for calculating the stability coefficient in the anti-overturning specification; Analyzed the eccentricity of the pier supports in a five span curved beam bridge and its impact on the anti-overturning stability coefficient. The calculation example shows that the maximum safe anti-overturning coefficient of the curved bridge is 1.55 when the two adjacent supports of the pier are set with eccentricity.

Key words： curved beam bridge moderate-strong earthquake moving load finite element dynamic analysis anti-overturning stability coefficient

收稿日期: 2023-08-21 出版日期: 2024-06-15

引用本文:

殷新锋1，方亚茹1，晏万里1，黄胄1，李茂侬1,2. 重载与中强地震联合作用下的曲线独柱墩桥梁倾覆性分析[J]. 振动与冲击, 2024, 43(11): 31-40.
YIN Xinfeng1, FANG Yaru1, YAN Wanli1, HUANG Zhou1, LI Maonong1,2. Overturning behavior analysis of curved single column pier bridge under combined action of heavy load and moderate-strong earthquake. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(11): 31-40.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I11/31

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