The Chinese Journal of Nonferrous Metals
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|第14卷 第1期 总第82期 2017年1月|
摘 要: 以某(84+160+84)m连续刚构桥为背景,建立考虑主梁-桥墩-桩基-土层的有限元模型,对桥墩高度、桥墩截面、双肢薄壁墩间距等影响因素分析,同时也对典型截面的内力与位移计算分析。研究结果表明:在桥墩高度为60~100 m范围内,中墩顺桥向剪力基本稳定,不再随桥墩高度的增加而递减。桥墩高度为100 m时梁体中跨跨中截面顺桥向与横桥向位移达到139.1和97.5 mm;从抗震角度分析,圆形截面桥墩对位移影响较大,空心矩形桥墩截面与实心矩形桥墩截面形式对墩顶内力的影响不大,故空心墩较节约材料;对于文中连续刚构桥分析,双肢薄壁墩间距为8 m时,梁体位移与桥墩墩顶内力均达到最小,合理的双肢薄壁墩间距能有效降低墩顶受力与梁体位移,能有效提高地震作用下的安全系数。
（Shanxi Traffic Vocational and Technical College,Taiyuan 030031,China）
Abstract:Based on a (84+160+84) m continuous rigid frame bridge, two finite element models are established, which considers the main bridge pier and bridge pier pile foundation. In this paper, the analysis of the factors affecting the pier height, pier, double limb thin-wall pier spacing, and also on the typical section of internal force and displacement calculation and analysis. The results show that: In the 60~65m range of bridge pier height, the bridge to the bridge to the basic shear stability, no longer with the increase of the height of the pier and decrease. At the same time, the increase of pier height increases the beam body falling risk, pier height of 100m beam write cross section along the bridge to cross the bridge and to the displacement reached 139.1, 97.5mm; From the point of view of seismic resistance, the influence of circular section bridge piers on displacement is larger, the effect of hollow rectangular pier section and solid rectangular pier section on the internal force of pier is small, so the hollow pier is more economical; For the analysis of continuous rigid frame bridge in the paper, double limb thin-wall pier spacing is 8m, displacement of girder and pier top force reached minimum, reasonable double limb thin-wall pier spacing can effectively reduce the pier top by force and displacement of girder, can effectively improve the safety factor of the earthquake.
Key words: continuous rigid frame bridge; bridge engineering; response spectrum method; earthquake action