Study on fire performance of high-strength concrete materials and members

高强混凝土材料及构件的防火性能研究

基本信息

批准号：
13650618
负责人：
UESUGI Hideki
金额：
$ 1.98万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650618/
关键词：
Fire High-Strength Concrete Fire Resistance Stress-Strain Curve Creep Transient Strain Thermal Strain Thermal Stress Analysis コンクリート

项目摘要

Three kinds of compressive tests are carried out about high-strength concrete with strength of 60MPa and 100MPa a at ranging from room temperature to 700℃ in order to obtain mechanical properties of high-strength concrete exposed to fire heating. On the basis of these data, thermal stress analyses are conducted about reinforced concrete members.At first, stress-strain curves are obtained by compressive tests under constant temperatures. On the basis of these data, compressive strength ratio at high temperature by one at room temperature, strain at compressive strength and stress-strain curves are formularized as a function of temperature. Secondary, creep data are obtained by creep tests under constant stresses and temperatures. On the basis of these data, creep strains are formularized as functions of time, stress and temperature. Thirdly, total strain data, which involve thermal strain, are obtained by compressive tests under constant stresses and under varying temperature. On the basis of these data, transient strains are formularized as functions of a stress and a thermal strain on referring to Anderberg's formula. Using the data obtained three kinds of compressive tests, thermal stress analyses are carried out for standard fire tests of reinforced concrete columns. The calculated values in the case where transient strain is considered approximately agree with the experimental values.

为了获得高强度的高强度混凝土，在室温到700℃的情况下进行了三种压缩测试，其强度为100MPa A，以获取暴露于火灾加热的高强度混凝土的机械性能。根据这些数据，对钢筋混凝土成员进行了热应力分析。首先，在恒定温度下通过压缩测试获得应力 - 应变曲线。在这些数据的基础上，在室温下，在高温下的抗压强度比在抗压强度和应力 - 应变曲线下的应变作为温度的函数。次要的蠕变数据是在恒定应力和温度下通过蠕变测试获得的。根据这些数据，将蠕变菌株表达为时间，压力和温度的功能。第三，涉及热应变的总应变数据是通过在恒定应力下和温度变化的压缩测试获得的。在这些数据的基础上，瞬态菌株被提出为应力的功能和指参考安德伯格公式的热应变。使用获得三种压缩测试的数据，对钢筋混凝土柱的标准火灾测试进行了热应力分析。在考虑瞬态应变的情况下，计算值大致与实验值一致。