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.

在此基础上，对强度为60MPa和100MPa的高强混凝土在室温至700℃范围内进行了三种压缩试验，以获得高强混凝土受火加热的力学性能。首先，通过恒温压缩试验得到应力-应变曲线，根据这些数据，将高温下的抗压强度比乘以室温下的1，压缩强度应变和应力-应变曲线被公式化为温度的函数。其次，蠕变数据是通过在恒定应力和温度下进行蠕变试验获得的。在这些数据的基础上，蠕变应变被公式化为时间、应力和温度的函数。第三，通过恒定应力和变化温度下的压缩测试获得总应变数据，其中涉及热应变。在这些数据的基础上，参考安德伯格的应力和热应变将瞬态应变公式化。公式.使用三种压缩试验得到的数据，对钢筋混凝土柱的标准耐火试验进行了热应力分析，在考虑瞬态应变的情况下的计算值与实验值大致吻合。