熵理论在分析混凝土裂缝扩展过程中的应用探讨

Application of Entropy Theory in the Analysis of Concrete Crack Propagation Process

混凝土裂缝的起裂、稳定扩展及失稳断裂,必然会引起系统内能量分布状态的变化.因而,本文从能量分布状态的角度对混凝土裂缝的扩展过程进行研究.应用耗散结构理论、熵理论等前沿非线性科学研究其稳定问题,在此基础上详细阐述了裂缝扩展过程中的熵变机理及信息熵的计算方法.结合具体试验进行数值模拟.结果表明,信息熵能够较好的描述混凝土裂缝的起裂、稳定扩展等阶段的变化.通过对初始裂缝周围区域的熵变规律研究,为混凝土裂缝的监测及试验方法从理论上提供了一条新的思路.

The energy distribution of concrete will be changed by cracking initiation, stable growth, and unstable propagation. From the point of energy distribution, the concrete crack propagation process is analyzed in this paper. The theories of dissipative structures and entropy are used to study the stability of concrete crack, and then the variation mechanism and computational method of entropy are expatiated in detail. The concrete crack propagation process can be better described by the entropy variation, which was confirmed by experiment and numerical simulation. Based on the study of entropy variation process of the zone around the initial crack, a new method of concrete crack monitoring and experiment is provided in theory.