西安建筑科技大学学报(自然科学版)

钢箱梁竖向波纹腹板剪力与磁记忆场强关系的试验研究

(1. 西安建筑科技大学土木工程学院,陕西西安 710055; 2. 成都基准方中建筑设计有限公司,四川成都 610021;3. 西安科技大学建筑与土木工程学院,陕西西安 710054)

Experimental research on the relationship between shear force and magnetic memory field strength of vertical corrugated webs of steel box girder

WANG Wei¹, REN Yingzi¹,SU Sanqing¹, MA Xiaoping¹, NIU Xiaobo²,DONG Lining³

(1.School of Civil Engineering, Xi'an Univ. of Arch. & Tech. Xi'an 710055, China;2. Chengdu Benchmark Building Design Co., Ltd., Chengdu 610021, China;3.School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China)

Keywords：bridge steel structure; shear performance; magnetic memory testing; steel box girder; corrugated steel web

DOI: 10.15986j.1006-7930.2019.03.004

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参考文献

金属磁记忆检测技术是一种新型的无损检测技术,其原理是基于铁磁构件表面产生的漏磁场进行检测.通过Q345qC波纹腹板钢箱梁的四点受弯试验,分析了竖向腹板表面的磁记忆信号沿梁高度方向的变化规律,发现在波纹腹板表面磁记忆信号曲线上,竖向集中力加载位置出现磁记忆场强“波峰”极值,且随着荷载的增大,“波峰”幅值越高,应力集中程度增大; 试件失稳时,磁记忆信号发生正负突变,以此可作为试件失稳时的评判特征; 随着检测线离集中力加载位置越远,“波峰”幅值越低; 随着标定高度的增大,磁记忆信号减小; 沿腹板高度方向区域平均磁记忆信号变化率与腹板高度无关,而主要与两个因素有关:其一是纯弯段或弯剪段区域位置,其二是施加的荷载大小; 弯剪段区域的绝对值随荷载的增加先增大后减小,磁记忆信号平均变化速率存在阈值.

Metal magnetic memory testing is a new nondestructive testing technology based on the magnetic flux leakage field of ferromagnetic components. In the four point bending experiment of Q345qC steel box girder, the variation rule of magnetic recording signal along the beam height direction on the vertical web surface were analyzed. And the relationship curve between magnetic memory signal and loading value were obtained. At the vertical concentrated force loading position, magnetic memory signal curve have a “peak” extreme value, and with the loading increasing, the peak amplitude become bigger, at the same time, the stress concentration increased also. When the steel box girder lose the stability state, magnetic memory signal have a mutations, from positive value change to negative value and vice versa, which may be used as a judgment to diagnose the instability situation for the girder. With the detection line farther away from the concentrated loading position, the wave peak amplitude is decreasing. With the increasing of height calibration, magnetic memory signal decreases. There are two main factors that influence the regional average magnetic memory signal change rate along the height direction of web, one is shear bending or pure bending region and the other is the magnitude of the applied loads, which, but no relate with the height value of web. The absolute value of the change rate of the magnetic memory signal increases initial and then decreases with the increasing of the loading.

引言
1 试验概况
2 试件腹板表面磁记忆信号检测
3 基于磁记忆的波纹钢腹板抗剪性能表征
4 结论

图1 波纹钢腹板单元尺寸(单位:mm)<br/>Fig.1 Element dimensions of corrugated steel web(Unit:mm)

图1 波纹钢腹板单元尺寸(单位:mm)
Fig.1 Element dimensions of corrugated steel web(Unit:mm)

图2 波纹腹板钢箱梁截面尺寸(单位:mm)<br/>Fig.2 Cross section size of corrugated web steel box girder(Unit:mm)

图2 波纹腹板钢箱梁截面尺寸(单位:mm)
Fig.2 Cross section size of corrugated web steel box girder(Unit:mm)

图3 波纹腹板钢箱梁三维图<br/>Fig.3 Three-dimensional drawings of corrugated web steel box girder

图3 波纹腹板钢箱梁三维图
Fig.3 Three-dimensional drawings of corrugated web steel box girder

图4 焊接成形的波纹腹板钢箱梁<br/>Fig.4 Welded corrugated steel box girder

图4 焊接成形的波纹腹板钢箱梁
Fig.4 Welded corrugated steel box girder

$表1 Q345qC钢的主要化学成分(质量分数‰)<br/>Tab.1 The main chemical composite of Q345qC steel(Mass fraction ‰)$

表1 Q345qC钢的主要化学成分(质量分数‰)
Tab.1 The main chemical composite of Q345qC steel(Mass fraction ‰)

表2 Q345qC钢的力学性能<br/>Tab.2 Mechanical behavior of Q345qC steel

表2 Q345qC钢的力学性能
Tab.2 Mechanical behavior of Q345qC steel

图5 试件检测线分布图(单位:mm)<br/>Fig.5 Distribution of test line(Unit:mm)

图5 试件检测线分布图(单位:mm)
Fig.5 Distribution of test line(Unit:mm)

图6 受弯试验加载示意图(单位:mm)<br/>Fig.6 Schematic diagram of bending test loading(Unit:mm)

图6 受弯试验加载示意图(单位:mm)
Fig.6 Schematic diagram of bending test loading(Unit:mm)

图7 跨度L=1.5 m试件腹板初始磁记忆信号曲线<br/>Fig.7 Initial magnetic memory signal curve of span L=1.5 m specimen

图7 跨度L=1.5 m试件腹板初始磁记忆信号曲线
Fig.7 Initial magnetic memory signal curve of span L=1.5 m specimen

图8 跨度L=1.5 m试件加载过程中腹板的磁记忆信号曲线<br/>Fig.8 Magnetic memory signal curve of web of L=1.5 m specimen during different loading value stage

图8 跨度L=1.5 m试件加载过程中腹板的磁记忆信号曲线
Fig.8 Magnetic memory signal curve of web of L=1.5 m specimen during different loading value stage

图9 波纹钢腹板沿波高的剪应力分布图<br/>Fig.9 Shear stress distribution of corrugated steel web along wave height direction

图9 波纹钢腹板沿波高的剪应力分布图
Fig.9 Shear stress distribution of corrugated steel web along wave height direction

图10 波纹钢腹板屈曲的三种破坏模式<br/>Fig.10 Three failure modes of corrugated steel webs

图10 波纹钢腹板屈曲的三种破坏模式
Fig.10 Three failure modes of corrugated steel webs

图11 钢箱梁波纹腹板的破坏图<br/>Fig.11 Failure diagram of corrugated web of steel box girder

图11 钢箱梁波纹腹板的破坏图
Fig.11 Failure diagram of corrugated web of steel box girder

图12 钢箱梁横截面及沿竖向腹板的标定高度<br/>Fig.12 Sketch of box girder cross section and calibration height along the vertical web

图12 钢箱梁横截面及沿竖向腹板的标定高度
Fig.12 Sketch of box girder cross section and calibration height along the vertical web

图13 加载过程中跨度L=1.5 m试件沿梁高方向的磁记忆信号<br/>Fig.13 Magnetic memory signals along the height of L=1.5 m girder during loading

图13 加载过程中跨度L=1.5 m试件沿梁高方向的磁记忆信号
Fig.13 Magnetic memory signals along the height of L=1.5 m girder during loading

图14 加载过程中跨度L=1.5 m试件腹板表面Kh-hy图<br/>Fig.14 Kh-hy diagram of web surface of span L=1.5 m specimen during loading

图14 加载过程中跨度L=1.5 m试件腹板表面Kh-hy图
Fig.14 Kh-hy diagram of web surface of span L=1.5 m specimen during loading

图15 加载过程中跨度L=1.5 m试件腹板表面的Kaveh-P曲线<br/>Fig.15 Kaveh-P curve of web surface of span L=1.5 m specimen during loading

图15 加载过程中跨度L=1.5 m试件腹板表面的Kaveh-P曲线
Fig.15 Kaveh-P curve of web surface of span L=1.5 m specimen during loading

图16 加载过程中跨度L=1.5m试件腹板弯剪段Kaveh-P曲线拟合图<br/>Fig.16 Kaveh-P fitting curve of L=1.5 m specimen of web bending section during loading

图16 加载过程中跨度L=1.5m试件腹板弯剪段Kaveh-P曲线拟合图
Fig.16 Kaveh-P fitting curve of L=1.5 m specimen of web bending section during loading

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期刊信息

西安建筑科技大学学报(自然科学版)
（1957年创刊双月刊）

主管单位：陕西省教育厅

主办单位：西安建筑科技大学

主　　编：刘加平（院士）

副主编：史庆轩（常务）张引科张小龙

国内刊号：CN61-1295/TU

I S S N：1006-7930

地　　址：西安市雁塔路中段13号

国内发行：西安建筑科技大学学报编辑部

国外发行：中国出版对外贸易总公司

编辑出版：西安建筑科技大学学报编辑部

备注

引言

1 试验概况

2 试件腹板表面磁记忆信号检测

3 基于磁记忆的波纹钢腹板抗剪性能表征

4 结论

期刊信息