混凝土结构空间多尺度环境作用研究

在分析混凝土结构所受主要环境作用的基础上,借鉴国外环境作用在空间尺度上的划分方法,针对中国的气候环境,建立了混凝土结构的空间多尺度环境作用模型框架,包括全局环境、地区环境、工程环境、构件表面环境和构件内部环境五个尺度,并得到了空间多尺度环境作用数学模型.以环境作用中的大气温度为例,在考虑各尺度上不同环境条件影响的基础上,由全局环境尺度上的环境作用值开始,通过地区环境、工程环境以及构件表面环境尺度上的逐步调整,最终计算得到混凝土内部的环境作用值,为混凝土结构的耐久性评估和设计提供依据.

Spatial Multi scale Environmental Actions for Concrete Structures

It is an important aspect of durability assessment and design of concrete structures to obtain the values of environmental actions at an arbitrary point in concrete. Based on an analysis of major environmental actions acting on concrete structures, a spatial multi-scale environmental action model framework for Chinese environment was established, with consideration of the spatial scale division method of environmental actions abroad. The framework considers the global, regional, engineering, surface, and internal environments of concrete. Furthermore, a mathematic model was proposed correspondingly. Taking the air temperature, one of the environmental actions as an example, considering the influencing factors of many different environmental conditions, the values of environmental actions in concrete was derived step by step from the values of the global environmental actions to those of the surface environment of concrete. The generated results can be used as reference for durability assessment and design of concrete structures.