| 苏三庆,杨超颖,王 威,余成龙,韩 松.建筑钢板件三点弯曲试验及磁记忆信号研究[J].电子测量与仪器学报,2021,35(4):136-144 |
| 建筑钢板件三点弯曲试验及磁记忆信号研究 |
| Study on three point bending test and magnetic memorysignal of building steel plate |
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| DOI： |
| 中文关键词: 磁记忆 无损检测 信号 梯度 应力集中 |
| 英文关键词:magnetic memory nondestructive testing signal gradient stress concentration |
| 基金项目:国家自然科学基金（51878548，51578449）、陕西省自然科学基础研究计划重点项目（2018JZ5013）资助 |
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| 中文摘要: |
| 为研究适用于钢结构建筑中以受弯为主的试件的损伤评价,通过对 Q235 钢板试件进行三点受弯试验,采集了试件加
载阶段的磁记忆信号值 Hp(y),引入多个磁记忆信号特征量,进行对钢结构损伤的表征研究。 试验结果表明,通过磁记忆曲线
的“波峰”和“波谷”现象以及磁记忆梯度曲线的“峰-峰值”现象,可以判断试件的应力集中区域。 通过其余相关特征量 ΔHp 曲
线、Sh 和| K| max 曲线可以发现试件的受拉面对试件的屈服比较敏感,用 ΔHp
-F 曲线的“拐点”和| K | max
-F 曲线的“波峰”作为试
件进入屈服的依据。 研究适用于对结构损伤表征的预判,并且用多重参数验证了磁记忆检测在钢结构损伤方面的可行性。 |
| 英文摘要: |
| In order to study the damage evaluation of specimens mainly subject to bending in steel structure buildings, a three-point
bending test was conducted on the Q235 steel plate specimen to collect the magnetic memory signal value Hp(y) during the loading stage
of the specimen, multiple magnetic memory signal characteristics are introduced to characterize the damage of steel structures. The
experimental results show that the stress concentration area can be determined by the phenomenon of “ peak” and “ trough “ of the
magnetic memory curve and the phenomenon of“peak-peak” of the magnetic memory gradient curve. It can be found that the tensile of
the specimen is sensitive to the yield of the specimen through other relevant characteristic quantities ΔHp
curve, Sh
and | K | max
curve.
The “inflection point” of the ΔHp
-F curve and the “ peak” of the | K | max
-F curve are used as the basis for the specimen to enter the
yield. The study is applicable to the prediction of structural damage characterization, and the feasibility of magnetic memory detection in
steel structure damage is verified by multiple parameters. |
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