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随着我国交通事业的快速发展,在山区地形偏多的地区,超高墩长联大跨度PC连续刚构应用越来越广泛。本文在已有的研究成果基础上,分析研究收缩徐变作用、合龙温差对超高墩长联大跨度PC连续刚构合龙成桥后及后期运营阶段内力和变形的影响。通过依托实际工程——咸旬高速公路三水河特大桥,在合龙过程中对合龙端箱梁截面施加顶推力,使桥墩获得一定的有利预偏,解决超高墩长联大跨度PC连续刚构在混凝土收缩徐变、合龙温差等影响下产生的问题,以便提高或者改善该种桥型在服役期间的工作性能和耐久性能。
With the rapid development of transportation in our country, the application of continuous rigid frame with long span and long span of ultra-tall piers is more and more widely in the terrain of mountainous areas. Based on the existing research results, this paper analyzes the effect of shrinkage and creep, and the effect of temperature difference on the internal forces and deformation during the operation phase after the continuous rigid-frame PC bridge with ultra-high pier long-span and long-span. By relying on the actual project - the Sanshui River Bridge of Xian-Xun Expressway, thrusting force is applied to the cross-section of the box girder during the closing process so that the pier can obtain a certain favorable pre-deflection to solve the long-span PC long- Structure in the concrete shrinkage and creep, temperature and other effects caused by closure in order to improve or improve the bridge during service performance and durability.