考虑活载对连续刚构桥长期下挠的影响
首发时间:2013-04-27
摘要:下挠是大跨径预应力混凝土桥最常见的病害之一,在以往对跨中长期下挠的建模计算中主要考虑恒载产生的影响,但国内车流量大、车辆荷载重,使得活载对长期下挠产生一定的影响。本文一方面考虑活载作用的长期性,将部分活载考虑一定系数以恒载的形式加载在桥梁上来考虑活载对长期下挠的影响;另一方面查阅相关文献,考虑重复活载产生的疲劳效应对长期挠度的影响。通过建模计算,结果显示部分按恒载考虑使三十年跨中挠度增大10.3%,而按照不同的公式考虑疲劳分别200万次加卸载后增大42%和19%。
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Impact of live load on deflection of large span pre-stressed continuous rigid frame bridge
Abstract:Deflection is one of the most common problems of long-span prestressed concrete bridge. Previous modeling calculation of deflection mainly considered the influence of constant load. However, the large traffic and heavy vehicle load in our country make a certain impact of live load on the deflection. In this paper, on the one hand, we considered the long-term of the live load influence, evaluating the live load effect on deflection by regarding a certain part of the live load coefficient as dead load on bridge load. On the other hand, we consulted relevant papers and measured the effect of repeated fatigue effect produced by live load on deflection. The results showed that the thirty-year mid-span deflection increased by 10.3% with respect of constant load, while that increased by 42% and 19% with respect of fatigue effect and adding uninstall according to different formulas.
Keywords: continuous rigid frame bridge deflection live load fatigue effect
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