预应力混凝土T梁的有限元分析与实验研究

Finite element analysis and experimental study of pre-stressed T-section concrete beam

从理论上探讨了预应力混凝土梁的等效荷载法,此法能够方便地分析多组曲线预应力筋梁,建立不必按力筋曲线剖分网格的等效模型,用于有限元分析方法中的简化分析.同时给出按力筋曲线形成的有限元索模型和施加预应力的温降法,并将等效模型与索模型数值模拟方法进行对比.还给出某工程50m跨混凝土T形截面梁施加预应力的实测结果,等效模型、索模型与实测数据吻合得很好.

Equivalent load method for calculation and analysis of pre-stressed T-section concrete beam is discussed theoretically. No need to take bar shape into account, the method make it easier to establish the numerical model and to analyze the beam, even for muti-pre-stressed-bar beam. Another equivalent method, temperature-dropping method, is also studied. Bar shape can be simulated by this method when pre-stress is loaded. As an example, A piece of 50m-span pre-stressed T-section concrete beam is calculated; and the results are well fit with the experimental results.