考虑温度变化的钢管混凝土徐变试验研究及预测模型

doi:10.11896/cldb.19050106

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Abstract In order to quantitatively calculate the influence of actual temperature change on the creep of CFST, creep models of the ACI209 are consi-dered, and the temperature parameters are introduced by Arrhenius theory. The formula for calculating the thermal creep of CFST considering temperature changes is derived by the effective modulus method based on age adjustment. The creep test under constant temperature of 20 ℃ and seasonal temperature change is carried out in the laboratory. The test results showed that compared with the creep under the constant temperature of 20 ℃,the growth rate of creep strain is 57.8% when the temperature is raised from 20 ℃ to 40 ℃, and the growth rate of creep strain is 34.1% when the temperature is raised from 40 ℃ to 60 ℃. The temperature change has a great influence on the creep of CFST. The temperature change should be considered when the CFST structure is designed under the actual temperature change environment. The model predictions are in good agreement with the test data by the comparison of the experimental data and the theoretical calculation value. It is indicating that the accuracy of the theoretical prediction of temperature is considered, which can provide reference for the creep design of CFST affected by the actual temperature.

Key words： concrete filled steel tube time-varying temperature creep prediction model test verification

Published: 12 November 2021

CLC number:

TU398

Fund:National Natural Science Foundation of China(51768033, 52068042),Gansu Province Science Fund for Distinguished Young Scholars (21JR7RA344), the Lanzhou Science and Technology Plan Project (2018-4-33).

Corresponding Authors: mogzrlggg@163.com

About author:: Rongling Zhang, professor of Lanzhou Jiaotong University, doctoral supervisor, mainly engaged in material durability and structure life-cycle of dry and cold area in the northwest.

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	ZHANG Rongling
	HAO Zhaofeng
	QI Qiang
	WANG Qicai
	MA Lina
	HUANG Guodong

Cite this article:

ZHANG Rongling,HAO Zhaofeng,QI Qiang, et al. Prediction Model for Creep of Concrete Filled Steel Tube(CFST) Based on Temperature Variation by Experimental Study[J]. Materials Reports, 2021, 35(20): 20028-20034.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19050106 OR http://www.mater-rep.com/EN/Y2021/V35/I20/20028

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