摘要
随着混凝土曲线梁桥的大量建立和长期运营,混凝土曲线梁桥呈现出的爬移问题受到业内外的广泛关注。文章以弯梁桥纯扭转分析理论为基础,从理论上推导了收缩徐变、预应力、温度变化、离心力等荷载作用下混凝土曲线箱梁桥位移的计算方法。在此基础上,针对某一实际工程,采用理论计算与数值分析相结合的方法,对其在外荷载作用下的变形情况进行了分析。结果表明:混凝土收缩和温度变化是引起爬移的主要原因。混凝土徐变及预应力对混凝土曲线箱梁桥径向位移可以忽略不计,同时,当车辆按照设计时速和标准载重条件行驶时,离心力对径向位移的影响可以忽略不计。
As the large establishment and long-term operation of concrete curved box girder bridges,the creeping problem has attracted a wide attention inside and outside the industry. The theoretical calculation method of displacement of concrete curved box girder bridge was derived based on the pure torsion analysis theory,and the analysis loads include shrinkage and creep. prestress,temperature and centrifugal force. On this basis,the displacement of a practical project under external loads was analyzed by the theoretical and finite element method. The results show that the concrete shrinkage and temperature change are the main causes of creep; the concrete creep and prestress are negligible for the radial displacement. Meanwhile,when the vehicle runs according to the designed speed and load conditions,the effect on the radial displacement caused by centrifugal force is negligible.
引文
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