四面体单元下预应力等效荷载计算

预应力混凝土结构在桥梁设计中有着广泛的应用,预应力作用转换为等效荷载的方式在桥梁结构分析中应用越来越广。现今预应力等效荷载的方式主要应用于梁单元,很少应用于体单元,这使精确性受到限制。使用体单元对混凝土桥梁进行体系受力分析计算时,预应力等代荷载计算具有一定的特殊性。针对四面体单元提出一种数值计算方法,推导出四面体单元下预应力等效荷载公式,能直接求解四面体单元下预应力钢束的等效荷载。并以某连续刚构桥为实例,检验提出的四面体单元下预应力等效荷载计算的正确性。

Calculation of Equivalent Load of Lower Prestress of Tetrahedron Unit

The prestressed concrete texture attains a widespread application in the design of bridge.Prestress converting to the equivalent load is increasingly widely applied.Nowadays,the way of prestressed equivalent load is principally used in the beam unit but rarely in the hierarchy one,that brings its acction to be restrained.The calculation of prestressed equivalent load possesses a fixed particularity when using the hierarchy unit to calculate load bearing of concrete bridge hierarchy.The paper proposes a numerical computations for tetrahedron unit and derives a formula for equivalent load of tetrahedron unit's lower prestress,moreover could directly solve the equivalent load of lowly prestressed reinforcement tedon of tetrahedron unit.As example with a certain continuous rigid-frame bridge,it puts forward correctness of equivalent load calculation of tetrahedron unit's lower prestress.