大跨度桥梁施工力学理论及其应用

Theory and Application of Construction Mechanics to Big-span Bridge

施工力学是工程力学的拓展,主要研究结构施工过程中结构的力学表现及其特点.桥梁施工力学理论体系的形成极大地促进了施工技术的发展,是大跨度桥梁施工控制的理论依据.桥梁施工力学理论成果主要有:主梁恒载内力计算的叠加算法、挠度计算的叠加算法及挠度与内力不匹配现象、混凝土徐变作用计算、有效预应力作用计算、结构最不利状态的确定及其结构安全性校核、施工过程中温度效应及混凝土早期应力计算、合理施工次序及施工方法的选择等7个方面。以高墩大跨径连续刚构桥为例,介绍了其应用方法。

Construction mechanics which mainly studies behaviour and characters in construction stage is a development on the basis of engineering mechanics. The formation of bridge construction mechanics theroy promotes the development of construction techniques and becomes the basis of construction control techniques in big-span bridges. Bridge construction mechanics theory has many achievements, such as calculation method of superposition of beam dead load endogenous force, calculation method of superposition of deflection, calculation method of creep and effective prestressing force and most dangerous state and temperature influence in construction and thermal stress of cement concrete at an early stage, determination of construction order and methods, and so on. A big-span continuous rigid frame bridge is taken as an example which shows the application of construction mechanics.