Early-Age Behavior of Large-Scale Concrete-Filled Steel Tubular Members： Field Measurement， Simulation， and Neural Network Prediction

LIU Xiaofan; WANG Zhangxuan; XIE Hongping; LIU Liang; TONG Teng; LI Xiaobo

doi:10.3724/j.gyjzG24022710

Volume 55 Issue 10

Oct. 2025

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LIU Xiaofan, WANG Zhangxuan, XIE Hongping, LIU Liang, TONG Teng, LI Xiaobo. Early-Age Behavior of Large-Scale Concrete-Filled Steel Tubular Members： Field Measurement， Simulation， and Neural Network Prediction[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(10): 163-170. doi: 10.3724/j.gyjzG24022710

Citation:

LIU Xiaofan, WANG Zhangxuan, XIE Hongping, LIU Liang, TONG Teng, LI Xiaobo. Early-Age Behavior of Large-Scale Concrete-Filled Steel Tubular Members： Field Measurement， Simulation， and Neural Network Prediction[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(10): 163-170. doi: 10.3724/j.gyjzG24022710

Citation:

LIU Xiaofan, WANG Zhangxuan, XIE Hongping, LIU Liang, TONG Teng, LI Xiaobo. Early-Age Behavior of Large-Scale Concrete-Filled Steel Tubular Members： Field Measurement， Simulation， and Neural Network Prediction[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(10): 163-170. doi: 10.3724/j.gyjzG24022710

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Early-Age Behavior of Large-Scale Concrete-Filled Steel Tubular Members： Field Measurement， Simulation， and Neural Network Prediction

doi: 10.3724/j.gyjzG24022710

1. Construction Branch of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210011, China;
2. School of Civil Engineering, Southeast University, Nanjing 211189, China

Received Date: 2024-02-27
Publish Date: 2025-10-31

Abstract

Abstract

For concrete-filled steel tube （CFST） columns with a large diameter， the cracking problems caused by the early-age hydration heat in the internal mass concrete urgently need to be studied. The temperature and strain in the concrete of the tower leg （a 2.1 m diameter CFST member） after pouring were measured. The tower leg is part of the world’s highest transmission tower， which stands 385 meters tall.The results showed that due to the early-age hydration of concrete， the temperature in its core region reached 97.0 ℃， with a maximum temperature difference of up to 30.6 ℃ compared to the steel wall surface. The tensile strain at the core region of the concrete reached 400×10^-6 after 30 hours of pouring， leading to early-age cracking in the concrete. Additionally， to investigate the impact of size on the early-age behavior of CFST members， eight CFST specimens with different diameters were manufactured and measured for temperature and strain. Based on the “hydration-thermal-mechanical” constitutive model， a refined finite element model for CFST members was developed and validated against experimental results. Finally， an early-age hydration heat database considering the diameter of CFST members， ambient temperature， and concrete mix proportions was established. Based on a BP neural network， the early-age behavior of CFST members was predicted. The BP neural network enables accurate prediction of early-age hydration heat in CFST members， thereby helping to reduce the risk of early-age cracking.
- CFST,
- large diameter,
- hydration,
- multi-field coupling,
- neural network

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References(17)

References

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