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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

41卷

期数:

2024年02期

页码:

49-57

栏目:

建筑结构

出版日期:

2024-03-30

文章信息/Info

Title:

Research on restrained shrinkage effect of composite beam stud on high performance concrete

文章编号:

1673-2049(2024)02-0049-09

作者:

占玉林^1,2,王吉坤¹,邵俊虎³,沈 东⁴,荆国强⁵,贾银钧¹

(1. 西南交通大学 土木工程学院,四川 成都 610031; 2.西南交通大学 土木工程材料研究所,四川 成都 610031; 3.成都大学 建筑与土木工程学院,四川 成都 610106; 4.温州市七都大桥北汊桥建设有限公司,浙江 温州 325052; 5. 中铁大桥科学研究院有限公司,湖北 武汉 430034)

Author(s):

ZHAN Yulin^1,2, WANG Jikun¹, SHAO Junhu³, SHEN Dong⁴, JING Guoqiang⁵, JIA Yinjun¹

(1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2.Institute of Civil Engineering Materials, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 3.School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, Sichuan, China; 4.Wenzhou Qidu Bridge North Branch Bridge Construction Co., Ltd, Wenzhou 325052, Zhejiang, China; 5.China Railway Bridge Science Research Institute, Ltd, Wuhan 430034, Hubei, China)

关键词:

钢-混组合梁;  栓钉;  高性能混凝土;  正交试验;  约束收缩;  开裂风险

Keywords:

steel-concrete composite beam;  stud;  high performance concrete;  orthogonal test;  restrained shrinkage;  cracking risk

分类号:

TU528.572

DOI:

10.19815/j.jace.2022.03142

文献标志码:

A

摘要:

为探究高性能混凝土在栓钉约束作用下的收缩特征及开裂行为,制作了钢-混凝土组合构件,通过试验研究了不同栓钉因素对高性能混凝土约束收缩应变、约束度及开裂风险的影响规律,运用正交试验方法研究了栓钉直径、间距、高度对高性能混凝土约束收缩的影响,得到了主要敏感因素。结果表明:高性能混凝土较普通混凝土的约束收缩应变发展趋势更为平滑; 各栓钉因素对约束收缩的敏感性影响的主次顺序依次为直径、间距、高度; 混凝土收缩在组合梁高度方向上呈现出一定的收缩梯度,混凝土约束收缩应变随高度增加而增大,但栓钉高度在30 mm处、间距在75 mm处、直径在150 mm处对高性能混凝土约束收缩几乎没有影响; 栓钉对混凝土的约束作用可定义为3个阶段,即约束增强阶段、约束下降阶段和约束稳定阶段; 组合梁构件最大开裂风险发生在栓钉的根部,当栓钉间距由150 mm减少到75 mm,直径由13 mm增加到22 mm时,最大开裂风险分别增加了20.03%和36.05%,栓钉高度的改变对最大开裂风险没有影响; 采用高性能混凝土以及直径小、高度高的栓钉布置方式可以有效减小混凝土的收缩及开裂风险。

Abstract:

In order to explore the shrinkage characteristics and cracking behavior of high performance concrete under stud restrained, steel-concrete composite components were made, and the effects of different factors of studs on the shrinkage strain, restrained degree and cracking risk of high performance concrete were analyzed through experiments. The effect of stud diameter, spacing and height on restrained shrinkage of high performance concrete was study by orthogonal test, and the main sensitive factors were obtained. The results show that the development trend of restrained shrinkage strain of high performance concrete is smoother than that of ordinary concrete. The sensitivity of each factor to restrained shrinkage is in the order of diameter, spacing and height. The concrete shrinkage presents a certain shrinkage gradient in the height direction, and the restrained shrinkage strain increases with the increase of height. But the stud height changing at 30 mm, spacing changing at 75 mm, diameter changing at 150 mm have little effect on restrained shrinkage. The restrained effect of studs on concrete can be defined as three stages, namely, the restrained enhancement stage, the restrained descent stage and the restrained stability stage. The maximum cracking risk of composite beam members occurs at the root of studs. When the stud spacing decreases from 150 mm to 75 mm, and the diameter increases from 13 mm to 22 mm, the maximum cracking risk increases by 20.03% and 36.05%, respectively. But the change of stud height has no effect on the maximum cracking risk. The shrinkage and cracking risk of concrete can be effectively reduced by using high performance concrete and stud arrangement with small diameter and high height.

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备注/Memo

备注/Memo:

收稿日期:2023-03-29
基金项目:国家自然科学基金项目(51878564); 四川省科技计划项目(2021JDTD0012); 四川省留学回国人员科技活动项目(川人社办发[2021]29号)
作者简介:占玉林(1978-),男,工学博士,教授,博士生导师,E-mail:yulinzhan@swjtu.edu.cn。

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更新日期/Last Update: 2024-03-25