拱桥微型机计算程序——恒载内力与附加内力的计算

• 作 者: 余诗泉 刘庆照
• 机 构: 东北林业大学,东北林业大学
• 出 处: 东北林业大学学报
• 发表日期: 1986年S3期
• 关键词: 拱轴线 附加内力 主拱圈 计算程序 压力线 弯矩作用 影响线 无铰拱 轴向压力 半拱

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

First, the basic principle When the arched arch axis and arch pressure load line coincide, the arch axis said the rational arch axis. At this point, the main arch cross-section only axial pressure, but no bending moment. In fact, such an arch axis is impossible to obtain. Because, arch loading in addition to dead load other things such as live load, temperature, material shrinkage, etc., all change over time. When the dead-line pressure line coincides with the arch axis, it deviates again due to the live load and other factors. Therefore, the main arch is not only pressure, but also bending. Due to the constant load of the arch bridge occupy most of the load, so the actual design are used constant load