温度作用下蜗壳外围混凝土裂缝稳定性分析  

Stability Analysis for Surrounding Concrete Cracks of Spiral Case under Temperature

作　　者：吕克志[1] 吕克金 

机构地区：[1]衢州学院,浙江衢州324000 [2]国核工程有限公司,上海200233

出　　处：《水利与建筑工程学报》2012年第1期73-77,共5页Journal of Water Resources and Architectural Engineering

摘　　要：大型直埋式蜗壳结构在温度作用下,外围混凝土裂缝受力条件复杂。以某水电站蜗壳结构为计算实例,应用ANSYS有限元软件建立了带裂缝的蜗壳管节模型,引入混凝土断裂力学。考虑温度变化作用,计算蜗壳结构在温度荷载作用下外围混凝土裂缝的应力强度因子,根据混凝土复合裂缝判据判断蜗壳外围混凝土裂缝的稳定性。计算结果表明,温度荷载对蜗壳外围混凝土裂缝稳定性影响较大。The stress state of the surrounding concrete cracks of huge complete bearing spiral case is more complex under temperature load.The finite element model of spiral case with cracks is established here with ANSYS software.By using the fracture mechanics of concrete,the stress intensity factor of the surrounding concrete cracks of spiral case is calculated under temperature load.Then the stability of the concrete cracks under different working conditions is analyzed and assessed with the mixed crack＇s criterion of concrete.The results show that the influence of temperature change to the surrounding concrete cracks of spiral case is more great.

关 键 词：直埋式蜗壳 温度荷载 混凝土裂缝 应力强度因子 断裂韧度 

分 类 号：TU37[建筑科学—结构工程]