考虑温度裂缝影响的岩锚梁早期温度应力场仿真研究

Temperature Stress Field Simulation of Rock Bolt Crane Girder Considering Temperature Cracks

鉴于岩锚梁早期温度裂缝的产生和发展对温度应力分布影响很大,基于三维非线性有限元数值计算理论,借助ANSYS通用有限元软件,以某地下厂房岩锚梁为例,模拟了岩锚梁浇筑完成后早期温度场及温度应力场的变化规律,并分别采用Solid45单元和Solid65单元对混凝土单元进行了温度应力分析,通过分析两种方案,推断出裂缝产生部位及温度裂缝的形成对岩锚梁早期应力分布的影响。分析结果为设计施工提出合理温控措施、控制和减少温度裂缝产生提供了有效依据。

Since the emergence and development of temperature cracks at the early stage of the pouring progress of the rock bolt crane girder has a great influence on the distribution of the temperature stress, based on three-dimensional non- linear finite element theory, this paper takes the rock bolt crane girder of an underground powerhouse as the research ob- ject and simulates the change law of temperature field and stress field after the pouring of concrete by using finite element analysis software-ANSYS. In the process of the temperature stress field analysis,Solid45 and Solid65 element is used to simulate the concrete element, respectively. Through comparing two different schemes, the influence of temperature cracking on the stress distribution and cracking positions is obtained. Furthermore, it can provide effective evidence for temperature control measures, controlling and reducing temperature cracks in design and construction process.