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依据大跨径预应力混凝土梁桥预应力损失机理,针对目前结构设计中影响纵向预应力损失的主要因素,优化大跨径预应力混凝土梁桥长束纵向预应力束为较短束,以减小预应力张拉过程中产生的摩阻损失,提高悬臂施工过程中箱梁根部的预应力储备,改善成桥后的应力状态,增强L/4截面混凝土的抗剪能力。为大跨径预应力混凝土梁桥的纵向预应力束的设计提供一种新的思路。
According to the principle of prestress loss of long-span prestressed concrete beam bridges, aiming at the main factors affecting the loss of longitudinal prestress in the structural design, the long-beam prestressed beams of long-span prestressed concrete beams are optimized to be shorter Small prestress tension friction loss generated during the cantilever construction process to improve the prestressed box root reserves to improve the bridge after the stress state and enhance the shear capacity of concrete L / 4 section. It provides a new idea for the design of longitudinal prestressed beams for long-span prestressed concrete girder bridges.