烈度地区拱桥地震响应研究

摘要:

本文以云南省昆明市滇中新区某座5×46上承式钢筋混凝土为研究对象,采用midas civil软件建立其全桥模型,探究了在地震作用下拱桥的地震响应问题,为今后高烈度地区拱桥的设计提供部分工程经验。计算结果表明：高烈度地区的拱桥在地震波作用下的响应较低烈度地区有了极大增强,同静力计算结果相比,主拱圈的弯矩和偏心距变化极大,且随着烈度的增加,偏心距改变结果愈加明显,这对主拱圈的承载能力是一种严峻的挑战。

关键词:拱桥;高烈度地区;地震作用;振型;承载能力

Abstract:

This paper takes a 5×46 deck reinforced concrete in the Dianzhong New District of Kunming City, Yunnan Province as the research object, uses midas civil software to build its full bridge model, and explores the seismic response of arch bridges under earthquake action. The design of the arch bridge provides some engineering experience. The calculation results show that the response of arch bridges in high-intensity areas under the action of seismic waves is greatly enhanced in areas with low-intensity. Compared with the static calculation results, the bending moment and eccentricity of the main arch ring vary greatly. With the increase of the eccentricity, the result of the change of the eccentricity becomes more obvious, which is a severe challenge to the load-bearing capacity of the main arch ring.

Key words:拱桥;高烈度地区;地震作用;振型;承载能力