核心混凝土缺陷对钢管混凝土构件徐变影响规律及预测模型研究

doi:10.11896/cldb.19100009

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Abstract In order to reasonably predict the creep law of concrete-filled steel tube members containing defects, creep tests of concrete-filled steel tube under four defect conditions were carried out, and the applicability of different creep prediction models for concrete-filled steel tube members at home and abroad was analyzed. The results show that in the process of compression, the micro-cracks of concrete around the cavity defects constantly occur and expand, causing the dislocation and slippage of concrete and increasing the additional deformation of concrete-filled steel tube. The debonding defect hinders the stress redistribution between the steel tube and the core concrete, weakens the interaction between the steel tube and the concrete, and increases the creep deformation of the core concrete. In the absence of defect and cavity defect, the theoretical value calculated by ACI209 model is closest to the measured value of concrete-filled steel tube creep. In the case of deboning defect, the theoretical value calculated by B3 model is closest to the measured value of concrete-filled steel tube creep. According to different defect types, a modified model is proposed, which greatly improves the accuracy of creep prediction of concrete-filled steel tube (CFST).

Key words： concrete-filled steel tube(CFST) defect creep prediction model

Published: 23 February 2021

CLC number:

TU398.9

Fund:This work was financially supported by the National Natural Science Foundation of China (51768033,52068042), Cheung Kong Scholars and Innovation Team Development Plan Rolling Support (IRT_15R29).

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.
Zhaofeng Hao studied for a master's degree at Lanzhou Jiaotong University from September 2018 till now, mainly engaged in the study of mechanical properties of concrete-filled steel tube structures.

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	ZHANG Rongling
	HAO Zhaofeng
	WANG Qicai
	MA Lina
	LYU Wenda
	LI Wenbo

Cite this article:

ZHANG Rongling,HAO Zhaofeng,WANG Qicai, et al. Research on Influence Law and Prediction Model of Core Concrete Defects on Creep of Concrete-filled Steel Tube Members[J]. Materials Reports, 2021, 35(4): 4099-4104.

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http://www.mater-rep.com/EN/10.11896/cldb.19100009 OR http://www.mater-rep.com/EN/Y2021/V35/I4/4099

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