超高性能混凝土的损伤力学模型及其在水利工程中的应用

Damage Mechanics Model of Ultra-High Performance Concrete and Its Application in Hydraulic Engineering

超高性能混凝土具有远超常规混凝土的强度和耐久性,本文探讨其在水利工程中的应用情况。为此,基于损伤力学理论,建立了超高性能混凝土的塑性损伤模型。利用该模型对超高性能混凝土简支梁进行了计算分析,计算结果与试验结果较为接近,验证了该损伤模型的合理性。最后将超高性能混凝土的损伤力学模型应用到Koyna重力坝抗震设计中,在大坝易损薄弱部位采用超高性能混凝土进行抗震加固。应用结果表明,超高性能混凝土能够显著降低地震时坝体的损伤程度,提高大坝的抗震性能。该成果为水利工程加固设计提供了新的思路。

Ultra-High Performance Concrete(UHPC)has far more strength and durability than conventional concrete.Its application in hydraulic engineering was discussed in this paper.For this reason,based on the theory of damage mechanics,the plastic damage model of UHPC was established.This model was used to calculate and analyze the simply supported beam of UHPC.The calculated results are close to the experimental results,which verifies the rationality of the damage model.Finally,the damage mechanics model of UHPC was applied to the seismic design of Koyna gravity dam.UHPC was used to reinforce the vulnerable parts of the dam.The application results show that UHPC can significantly reduce the damage degree of the dam during earthquake and improve the seismic performance of the dam.The result provides a new idea for reinforcement design of hydraulic engineering.