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

卷:

40卷

期数:

2023年05期

页码:

69-77

栏目:

建筑结构

出版日期:

2023-09-15

文章信息/Info

Title:

Experimental study on shear behavior of new partially encased I-steel composite beams

文章编号:

1673-2049(2023)05-0069-09

作者:

辛 力¹,刘 源¹,姚怡帆²,黄 华²,高 悦²

(1. 中国建筑西北设计研究院有限公司,陕西 西安 710018; 2. 长安大学 建筑工程学院,陕西 西安 710061)

Author(s):

XIN Li¹, LIU Yuan¹, YAO Yifan², HUANG Hua², GAO Yue²

(1. China Northwest Architecture Design and Research Institute Co., Ltd, Xi'an 710018, Shaanxi, China; 2. School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China)

关键词:

新型部分填充工字钢组合梁;  受剪性能;  试验测试;  承载力;  计算方法

Keywords:

new partially encased I-steel composite beam;  shear behavior;  experimental test;  bearing capacity;  calculation method

分类号:

TU398

DOI:

10.19815/j.jace.2021.12124

文献标志码:

A

摘要:

为增大钢材利用率,提高组合梁受剪性能,提出了一种新型部分填充工字钢组合梁,并以栓钉排布方式、剪跨比以及混凝土填充量为参变量,采用“力-位移控制”的加载方式,对4根新型组合梁及对比工字钢梁进行了静力荷载作用下的受剪性能试验研究; 对比分析了新型组合梁和对比工字钢梁受力过程中的破坏形态、剪力-转角曲线、剪力-应变曲线以及承载力变化情况。结果表明:剪跨比1.6≤λ≤2.0的组合梁发生剪压破坏,剪跨区有贯通的主斜裂缝; 剪跨比为1.15的组合梁发生斜压破坏,剪跨区形成多个受压短柱,混凝土大面积剥落; 剪跨比从1.6减小至1.15时,极限承载力相应提高了31.8%; 混凝土的存在使新型组合梁的受剪承载力较普通的工字钢梁提高了33.3%; 翼缘栓钉的存在提高了组合梁截面的组合作用,使混凝土能充分发挥其抗压能力,极限受剪承载力相应提高了5.8%～29.1%,组合梁延性和刚度也相应增大; 结合试验实测数据,基于新型部分填充工字钢组合梁的构造特点,采用组合结构设计规范中受剪承载力计算公式,公式计算值与试验值吻合较好,该公式可为实际工程中的结构设计提供一定参考。

Abstract:

In order to increase the utilization rate of steel and improve the shear behavior of composite beams, a new type of partially encased I-steel composite beam was proposed. Experimental study on shear behavior of four new composite beams and a contrast I-steel beam under static load was carried out with stud arrangement, shear span ratio and concrete filling amount as parameters, and “force-displacement control” loading method was adopted. The failure mode, shear-rotation curve, shear-strain curve and bearing capacity of the new composite beam and the contrast I-steel beam in the stress process were compared and analyzed. The results show that the composite beam with shear span ratio 1.6≤λ≤2.0 occurs shear compression failure, and the shear span area has the through main oblique cracks. The composite beam with shear span ratio 1.15 occurs tilting pressure failure. Multiple compression short columns are formed in the shear span area, and the concrete is peeled off in large area. When the shear span ratio is reduced from 1.6 to 1.15, the ultimate bearing capacity is increased by 31.8%. The shear capacity of the new composite beam is 33.3% higher than that of the ordinary I-steel beam due to the existence of concrete. The existence of flange studs improves the combined action of composite beam section, so that the concrete can give full play to its compressive capacity. The ultimate shear capacity is increased by 5.8%-29.2%, and the ductility and stiffness of composite beams are also increased. Based on the experimental data and the structural characteristics of the new partially encased I-steel composite beam, the shear capacity calculation formula in the design specification of composite structures is adopted. The calculated values of the formula are in good agreement with the experimental values. The formula can provide some reference for structural design in practical engineering.

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备注/Memo

备注/Memo:

收稿日期:2021-12-13
基金项目:陕西省青年科技新星项目(2021KJXX-77); 陕西省科技厅重点研发计划项目(2023-YBGY-184); 中国博士后科学基金项目(2022M723005)
作者简介:辛 力(1981-),男,工学博士,高级工程师,E-mail:xinli1129@sina.com。
通信作者:姚怡帆(1995-),男,工学博士研究生,E-mail:yyf30727@163.com。

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更新日期/Last Update: 2023-09-01