【摘要】 <正> 一、基本原理 当拱桥的拱轴线与拱上荷载的压力线相吻合时,拱轴线称合理拱轴线。此时,主拱圈截面只有轴向压力,而无弯矩作用。事实上,这样的拱轴线是不可能得到的。因为,拱上荷载除恒载之外其他如活载、温度、材料的收缩等,都随时间而变化。当恒载压力线与拱轴线吻合时,由于活载和其他因素的作用,又使之发生偏离。所以,主拱圈不但受压,而且受弯。由于拱桥的恒载占全部荷载的绝大部分,故实际设计中都采用恒载压更多还原

【Abstract】 In this paper, the "Influence Line Method" is used to calculate the internal force caused by dead loads in arch bridges and the "Hand book Method" is still adopted to estimate the additional force and the limi tation of internal force caused by pedestrian loads. The dead-load force consists of those caused by elastic compression of members and the deviation from arch axis. For convenience, the results of calculated internal force of the deviation of arch axis is given seperataly as well as the results of internal force in order to check naked arch.The programme for the calculation was Written in Microcomputer Z—80 Extended BASIC, which has been checked correctly. So it can be taken as reference in teaching, researching and designing.更多还原