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目前,国内外对拱的地震反应只计算弯曲振动引起的地震内力。但经过对十年来国内几次大地震造成的拱桥震害进行较详细的分析研究后,发现传统的计算方法不能很好的解释拱桥的破坏现象。为了探讨这个问题,本文提出了必须考虑拱的拉压振动引起的地震内力的新观点。计算结果表明,拉压振动引起的地震内力数值很大,不容忽视。因此建议应考虑弯曲和拉压振动引起的地震内力的共同作用,以便使拱的各种震害现象能得到较合理的解释和保证结构的安全。
At present, the seismic response to the arch at home and abroad only calculates the seismic internal force caused by bending vibration. However, after a detailed analysis of the earthquake damage to the arch bridge caused by several major earthquakes over the past 10 years, it has been found that the traditional calculation methods do not explain the destruction of the arch bridge well. In order to explore this problem, this paper presents a new view that we must consider the seismic internal force caused by tension and compression vibration of arch. The calculation results show that the seismic internal force caused by tension and compression vibration is very large and can not be ignored. Therefore, it is suggested that the combined effect of seismic internal forces caused by bending and tension-compression vibrations should be taken into account in order to make the seismic damage phenomena of arch more reasonable and to ensure the safety of structures.