Experimental and numerical investigation on vertical temperature gradient of concrete-filled steel tubular arch under sunlight

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2024-10-22 DOI:10.1016/j.istruc.2024.107550

Xinkai Yan , Yongjian Liu , Jiang Liu , Yi Lyu , Xiandong Wang , Jinglin Jia

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Abstract

To investigate the effects of diameter and inclination on the vertical temperature gradient (VTG) of concrete-filled steel tubular (CFST) arches, this study conducted temperature field tests on three CFST segment specimens with diameters of 426 mm, 750 mm, and 1000 mm, as well as an arch specimen with inclination angles varying from 48.76° to −48.76°. 2D and 3D numerical simulation models were developed to analyze the impact of diameter, wall thickness, inclination and orientation. The results indicate that as the diameter increases, the internal temperature becomes more uniform, forming a constant temperature zone in the middle of the VTG, with linear increases in temperature differences at the top (T₁) and bottom (T₂). Beyond approximately 600 mm in diameter, the VTG stabilizes. The maximum T₁ of the three segment specimens were 15.37 ℃, 22.40 ℃, and 23.81 ℃, respectively. Inclination affects the solar incidence angle and intensity, causing T₁ to vary along the arch span, proportional to solar intensity. The maximum difference of T₁ in the arch specimen reached 10.87 ℃. Wall thickness showed minimal effect on the VTG. The proposed VTG pattern was applicable to arches with various orientations and can assist in evaluating thermal effects in CFST arches.

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日照下混凝土填充钢管拱垂直温度梯度的实验和数值研究

为研究直径和倾角对混凝土填充钢管拱（CFST）垂直温度梯度（VTG）的影响，本研究对直径分别为 426 毫米、750 毫米和 1000 毫米的三个 CFST 节段试件以及倾角为 48.76° 至 -48.76° 的拱形试件进行了温度现场测试。开发了二维和三维数值模拟模型来分析直径、壁厚、倾角和方向的影响。结果表明，随着直径的增加，内部温度变得更加均匀，在 VTG 中间形成一个恒温区，顶部（T1）和底部（T2）的温差呈线性增加。直径超过约 600 毫米后，VTG 趋于稳定。三段试样的最大 T1 分别为 15.37 ℃、22.40 ℃ 和 23.81 ℃。倾角会影响太阳入射角和强度，导致 T1 沿拱跨变化，与太阳强度成正比。拱形试样中 T1 的最大差异达到 10.87 ℃。壁厚对 VTG 的影响很小。所提出的 VTG 模式适用于不同方向的拱，有助于评估 CFST 拱的热效应。

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.