考虑热传导-蒸汽压耦合作用的混凝土高温破坏行为解析方法研究  

Study of analytical approach on failure behavior of concrete at high temperature considering coupled heat conduction and vapor pressure

作　　者：张永兴[1] Zhang Yongxing(Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学,江苏南京210037

出　　处：《土木工程学报》2022年第8期77-81,共5页China Civil Engineering Journal

摘　　要：针对火灾高温下混凝土处于热传导-蒸汽压耦合作用受力特点,以与物质移动理论相结合的非线性分析方法为研究平台,借鉴既有的基于物质移动理论的杆单元网络模型,研究考虑热传导-蒸汽压耦合作用的混凝土高温破坏行为解析方法并实现程序化。该解析方法采用刚体单元对混凝土连续体进行离散化处理,采用三维杆单元网络表征混凝土内部热传导与开裂前后蒸汽压不同移动规律。所采用的解析方法可以准确反映火灾高温下混凝土开裂直至爆裂的真实破坏形态,以期为混凝土高温破坏行为研究提供了可行方法。In view of the characteristics of concrete subjected to coupled heat conduction and vapor pressure at high temperature,a numerical approach on failure behavior of concrete at high temperature considering the coupled heat conduction and vapor pressure is studied and coded,based on the research platform of nonlinear analysis method for structure damage combined with the mass transfer theory as well as truss element network.In the analytical approach,the rigid body element is adopted to discretize the concrete continuum,and the three-dimensional truss element network is used to characterize the different movement laws of heat conduction and vapor pressure before and after cracking.The analytical approach used can accurately reflect the realistic failure pattern of concrete at high temperature from cracking to spalling,providing a feasible method for studying failure behaviour of concrete at high temperature.

关 键 词：混凝土 高温作用 破坏行为 热传导-蒸汽压耦合 非线性分析 

分 类 号：TU528.59[建筑科学—建筑技术科学]