The frequent short steps saddle pushing principle presented,means that saddle pushing was frequent and that the space of each push.
针对悬索桥施工中塔顶主索鞍的顶推问题,以宜昌长江公路大桥为例,采用三维的实体退化虚拟层合单元建立起全桥的三维有限元模型,对主梁吊装阶段的悬索桥桥塔应力进行了分析,并对索鞍顶推、索鞍自由滑移、索鞍固结这3种假想情况下的桥塔应力计算结果进行了对比,提出了塔顶主索鞍顶推的小步快跑原则,即适当增加顶推次数,减小每次顶推的顶推量。
The method of achieved band-wide and small frequency step were described.
采用DDS+PLL技术实现频率合成器,其特点是宽频带(3~6GHz)、小步进(1kHz)、低相位噪声,频率捷变。