基于恒载零弯矩理论的预应力配束方法

Method of Prestressing Layout based on Zero Bending Moment of Load Theory

梁内弯矩和梁体位移称为当前连续梁桥悬臂浇筑、运营维护的关键参数。首先分析了零弯矩理论的原理和力学性能,然后依托于实际工程,对于传统设计理论和零弯矩理论下的梁内弯矩和梁体位移,在不同阶段如一期恒载作用和二期恒载作用下的梁内弯矩和梁体位移进行了对比分析。结果表明,零弯矩理论在连续梁桥配束中具有良好的适用性。

The intra-beam bending moment and beam displacement have been considered as key parameters for cantilevering casting, operation and maintenanceof modern continuous beam bridge.In this paper, the principle and mechanical properties of zero bending moment theory have been analyzed, and then the intra-beam bending moment and beam displacementin different stages such as the first-stage dead load and second-stage dead load between the traditional design theory and the zero bending moment theory have been compared and analyzed.The results have shown that the zero bending moment theory has good applicability in the wire distribution of continuous beam bridge.