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Thermal Analysis of Structures and its Inverse Analysis

结构热分析及其反分析

基本信息

批准号：
09045059
负责人：
MATSUI Kunihito
金额：
$ 0.64万
依托单位：
Tokyo Denki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09045059/
关键词：
meterological phenpmenon solar radiation sky radiation albedo emissivity heat transfer analysis solar cadiation sky radiation thermal analysis thermal stress analysis inverse analysis

项目摘要

Many civil engineering structures are exposed to the natural environment and thus, they are subjected to the change of climate. It is the purpose of this study to investigate the effects of the nature on the structures by modeling the natural phenomenon. In order to achieve the purpose, it is essential to establish an interface model between the structures and the surrounding environment.External factorsthat affecttemperature change in them aremeteorological actions such as air temperature, solar radiation, sky radiation, wind velocity, and water evaporation. Also those which need to be considered are the densities, specific heats and thermal conductivity of a structure and surrounding soil, and a heat source if it exists. The most complicated is the interface condition between sfructural surfre and the surrounding environment. Convective heat transfer, short wave radiation and long wave radiation have to be taken into consideration and further latent heat should be included is the suifaceis watered. Throughthe heat transfer analysis along with the interflice model, thermal change in a body of structure can be estimated.A question here is verification of the interface model. Joint research with a private company is also undertaken and a field expenment has been conducted to observe the interaction between a structure and meteorological factors. The upward and downward solar radiation, the upward and downward sky radiation, dewpoint temperature, wind velocity and body temperature of concrete have been monitored over one year. Through the experiment, it is aimed to establish the interface model that meets the seasonal as well as weather changes. Judging from over all outcomes, it has become apparent that a body temperature of concrete to the environmental effects can be very well estimated except the period of rainy days.

许多土木工程结构暴露在自然环境中，因此，它们会受到气候变化的影响。本研究的目的是通过模拟自然现象来研究自然对结构的影响。为了达到这一目的，必须建立结构与周围环境的界面模型，影响结构内部温度变化的外部因素主要有气温、太阳辐射、天空辐射、风速、水分蒸发等气象因素.还需要考虑的是结构和周围土壤的密度、比热和导热率，以及热源（如果存在）。最复杂的是结构面与周围环境的界面条件。考虑对流换热、短波辐射和长波辐射，如果表面有水，还应考虑潜热。结合界面模型进行沿着传热分析，可以估算出结构体内部的热变化情况，问题在于界面模型的验证。还与一家私营公司进行了联合研究，并进行了实地考察，以观察结构与气象因素之间的相互作用。通过一年多的观测，对混凝土的太阳辐射、天空辐射、露点温度、风速和人体温度进行了观测。通过实验，建立了适应季节和天气变化的界面模型。从所有的结果来看，很明显，除了雨天，混凝土的体温对环境的影响可以很好地估计。