混凝土自锚式悬索桥结构内力分析

为研究混凝土自锚式悬索桥的结构受力特征以及与地锚式悬索桥的差别,通过计算实例,分析比较混凝土自锚式悬索桥结构的力学特性,研究其拱度、矢跨比变化时引起的内力变化规律,混凝土收缩、徐变对内力影响的规律.对于中小跨度的自锚式悬索桥来讲,除了主梁的轴力偏大以外,结构的其余内力与地锚式悬索桥的差别不是很大,差值在10％以内.拱度和混凝土的收缩、徐变的影响比较明显.与相应的水平加劲梁和不考虑收缩、徐变影响的计算结果比较,差值均在20％以上.弹性理论适合干中小跨度的自锚式悬索桥的设计和计算.

Internal force analysis for concrete self-anchored suspension bridge

The mechanic performance of concrete self-anchored suspension bridge is studied and compared with that of the earth-anchored suspension bridge.The variational of internal force of concrete serf-anchored suspension bridge is analyzed when the camber and the rise-span ratio are changed by the computed results, and the influence of creep on the internal force is also analyzed.The main difference between the earth-an- chored suspension bridge and the self-ahchored suspension bridge is the axial force of main girder.Otherwise, there is no less than 10% difference in all other internal forces between the two types of bridges.The effect of arch degree,creep and shrink of concrete is very distinct.Ignoring the effect of these factors,the comparison would arrive at a significant deviation of no less than 20%.Elastic theory is applicable to the design and cal- culation of medium-span self-anchored suspension bridges.