| 任青文,殷亚娟,顾嘉丰.基于修正耗散能的水工混凝土损伤分析[J].水利学报,2024,55(10):1199-1209 |
| 基于修正耗散能的水工混凝土损伤分析 |
| Damage analysis of hydraulic concrete based on modified dissipated energy |
| 投稿时间：2024-01-02 |
| DOI：10.13243/j.cnki.slxb.20240002 |
| 中文关键词: 损伤变量 耗散能 损伤耗能修正系数 水工混凝土 损伤分析 |
| 英文关键词: damage variable dissipated energy damage energy dissipation correction coefficient hydraulic concrete damage analysis |
| 基金项目:国家自然科学基金项目(51739006);江苏省卓越博士后计划项目(2023ZB678) |
|
| 摘要点击次数: 606 |
| 全文下载次数: 291 |
| 中文摘要: |
| 能量耗散是混凝土变形破坏的本质属性，以能量研究岩体和混凝土等准脆性材料的破坏是一条可行的途径。然而，现有的以能量定义损伤变量的损伤分析结果与混凝土实际的破坏演变过程并不一致。本文通过建立损伤变量与耗散能之间的新关系，认为导致混凝土损伤的并非是全部耗散能，而是其中的一部分。因此，将耗散能分为两部分，一部分是引起混凝土损伤的耗散能，另一部分是混凝土在荷载作用下功-能转化过程中的其他耗散能。通过引入损伤耗能修正系数λ，定义损伤变量，并根据实测试验曲线确定λ值，建立了损伤演化方程。针对实测试验曲线的损伤分析结果表明，采用该方法计算的损伤演化过程与试验曲线更为吻合。将该方法应用于水工混凝土规范给出的应力应变曲线，揭示了水工混凝土损伤演化过程中损伤变量和等效塑性应变的变化规律，可为开展水工混凝土的损伤分析研究提供可行的途径。 |
| 英文摘要: |
| Energy dissipation is the essential property of concrete deformation and failure.It is a feasible way to study the failure of quasi-brittle materials such as rock mass and concrete from the perspective of energy.However，the existing damage analysis results based on the definition of damage variable by energy are not consistent with the actual damage evolution process of concrete.In this study，a new relation between the damage variable and the dissipated energy is established，and it is considered that the damage of concrete is not all caused by the dissipated energy，but by a part of it.Therefore，the dissipative energy is divided into two parts，one is the dissipative energy Ud1 that causes the concrete damage，and the other is other dissipative energy Ud2 in the process of concrete work and energy conversion under loads.By introducing the damage energy dissipation correction coefficient λ，the damage variable is defined.The λ value is determined according to the measured test curve，and the damage evolution equation is established.The damage analysis results of the measured test curve show that the damage evolution process calculated by this method is more consistent with the test curve than by the traditional method.The method is applied to the stress-strain curve given in the hydraulic concrete specification，and the variation law of damage variable and equivalent plastic strain in the damage evolution process of hydraulic concrete are revealed，which provides a feasible way to carry out damage analysis of hydraulic concrete. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |