Zhang Jinyang, Liu Haiqing, Gong Xiangen, Lei Ming, Wang Liang
School of Civil Engineering, Liaoning Technical University, Fuxin, 123000, China.
China Construction Fifth Engineering Division Corp., Ltd., Changsha, 410004, China.
Sci Rep. 2025 Aug 11;15(1):29295. doi: 10.1038/s41598-025-14692-8.
To ensure smooth closure of prestressed concrete continuous girder bridges and compliance of structural geometric alignment/stress with design requirements, this study employs finite element modeling to analyze the impact of variations in key construction control parameters during cantilever construction on bridge alignment and stress states at both the final completed stage and during maximum cantilever conditions. The investigated parameters encompass concrete unit weight, elastic modulus, prestressing loss, concrete shrinkage and creep, and temperature. Coupling effects among critical parameters were analyzed, leading to the establishment of a construction monitoring system that incorporates coupled effects of key control parameters. Results indicate that temperature variations and prestressing loss exert significant influences on girder alignment and stress, whereas concrete elastic modulus and unit weight exhibit relatively minor effects. Consequently, parameters exerting substantial impacts on alignment and stress require priority in monitoring to guarantee successful closure during cantilever construction.
为确保预应力混凝土连续梁桥顺利合拢，以及结构几何线形/应力符合设计要求，本研究采用有限元建模，分析悬臂施工过程中关键施工控制参数的变化对桥梁在最终竣工阶段和最大悬臂状态下的线形及应力状态的影响。所研究的参数包括混凝土容重、弹性模量、预应力损失、混凝土收缩和徐变以及温度。分析了关键参数之间的耦合效应，从而建立了一个纳入关键控制参数耦合效应的施工监测系统。结果表明，温度变化和预应力损失对梁的线形和应力有显著影响，而混凝土弹性模量和容重的影响相对较小。因此，对线形和应力有重大影响的参数在监测中需要优先考虑，以确保悬臂施工期间的顺利合拢。
