预应力砼超静定结构次内力的计算

CALCULATION OF SECONDARY INTERNAL FORCE IN STATICALLY INDETERMINATE PRESTRESSED CONCRETE STRUCTURES

预应力将在超静定结构中产生次内力．本文基于结构分析中的力法原理，对预应力杆单元进行了分析，推导出计算具有任意曲线形状的预应力筋和沿预应力筋纵向具有任意分布的预应力所产生的杆单元固端次内力的积分表达式．推导直接从次内力产生的机理出发，因而力学概念清晰．

Prestress will cause secondary internal force in statically indeterminate structures.Based on the principle of forced-method of structural analysis, an integral formal for calculating the secondary internal force at the fixed ends of prestress-element due to prestressing with any initial shape of prestressing cable and any distribution of prestress along the cable has been developed througy analysis of presress-element. Since the formal is directly developed from the cause of secondary internal force, it has clear concept in mechanics.