加压成型钢管混凝土技术及加压混凝土力学性能

王开强; 孟姣; 孙庆; 聂鑫; 杨辉; 林琦; 董耀武

doi:10.3724/j.gyjzG24061105

加压成型钢管混凝土技术及加压混凝土力学性能

doi: 10.3724/j.gyjzG24061105

王开强¹,
孟姣²,
孙庆¹,
聂鑫²,
杨辉¹,
林琦¹,
董耀武¹

1. 中国建筑先进技术研究院, 武汉 430075;
2. 清华大学土木工程系, 北京 100084

基金项目:

国家自然科学基金杰出青年基金(52325802)。

详细信息

作者简介:
王开强,博士,高级工程师,主要从事高强钢结构、施工装备研究。电子信箱:814291651@qq.com

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出版历程
- 收稿日期: 2024-06-11
- 网络出版日期: 2025-03-28

A Pressure Forming Technique for Concrete-Filled Steel Tubes and Mechanical Properties of the Compressed Concrete

1. China Construction Institute of Advanced Technology, Wuhan 430075, China;
2. Department of Civil Engineering, Tsinghua University, Beijing 100084, China

摘要

摘要: 设计了一种加压成型钢管混凝土装置,能够在新拌混凝土上施加一定时间、一定大小的机械压力。采用此装置制作7组不同加压时间、不同压力水平的加压成型混凝土试件,进行轴压破坏试验,研究了加压成型工艺对核心混凝土强度、脆性、应力-应变关系的影响,提出了加压成型混凝土的强度拟合公式。通过数值模拟分析了加压成型构件的钢-混凝土协同受力机理。结果表明:经过加压,混凝土强度可提升12%~42%,且随加压时间和压力大小的增加,混凝土强度增加;加压时间对加压成型混凝土强度的影响更为显著;所提出的加压成型混凝土强度公式能够较好拟合试验结果,大部分试件误差在3%以内,个别试件误差在15%以内;加压成型技术主要通过改良核心混凝土强度来提升加压成型构件的轴压性能,初始环向应力带来的构件轴压强度增长率小于5%。
- 加压成型 /
- 新拌混凝土 /
- 钢管混凝土 /
- 轴压试验 /
- 强度 /
- 有限元
Abstract: A device for pressure forming concrete-filled steel tubes (CFST) was designed, which can apply a certain amount of mechanical pressure on fresh concrete for a certain period of time. Using this device, 7 sets of compressed concrete specimens with different compressing times and pressure levels were fabricated and subjected to axial compression failure tests. The influence of compressing conditions on concrete strength, brittleness, and stress-strain relation was studied, and a strength fitting formula for compressed concrete was proposed. The collaborative mechanism between the steel tube and core concrete in pressure formed components was analyzed through numerical simulations. The results showed that after compressing, the strength of concrete could be increased by 12%-42%, and the strength of concrete increased with the increase of compressing time and pressure magnitude; the effect of compressing time on the strength of compressed concrete was more significant; the proposed formula for compressed concrete strength could fit the test results well, with most specimens having an error of less than 3% and some specimens having an error of less than 15%.The pressure forming technique mainly improved the axial compression performance of pressure formed components by improving the strength of the core concrete. The growth rate of the component’s axial compression strength caused by the initial circumferential stress was less than 5%.
- pressure forming /
- fresh concrete /
- CFST /
- axial compression test /
- strength /
- finite element

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