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投稿时间：2021-08-05 修订日期：2022-01-09
投稿时间：2021-08-05 修订日期：2022-01-09
中文摘要: 为研究地震作用下非膨胀型防火涂料的破损机理，进行一缩尺钢框架模型的地震振动台试验，观测地震作用下，钢梁和钢柱的防火涂料破坏特征和脱落位置，获得钢框架结构在地震作用下的层间位移角、梁端和柱端应变数据，分析层间位移角、应变与防火涂料脱落的关系；基于ABAQUS通用有限元软件，采用弹塑性损伤本构模型，分析在地震作用下，防火涂料的损伤和脱落行为；对钢柱构件和整体钢结构中梁、柱和节点等位置防火涂料脱落行为和机理进行数值分析，并与试验结果进行对比。结果表明：1）梁柱腹板位置总体未发生脱落，防火涂料脱落集中在梁柱节点区域，特别是临近节点区域及梁上翼缘位置；2）由地震作用下结构梁柱应变可知，钢材屈服应变部位几乎与涂料脱落部位一致；钢材应变超过屈服应变或层间位移角超过1/150，涂料开始脱落；3）采用弹塑性损伤本构模型的数值模拟分析方法，能合理地分析防火涂料脱落行为，涂料等效塑性应变分布、脱落位置与钢材等效塑性应变及Mises应力分布基本一致，即钢材等效塑性应变和Mises应力较大的位置，防火涂料易发生脱落；涂料等效塑性应变对涂料脱落有较大影响，非膨胀型防火涂料脱落时，等效塑性破坏应变可取值0.002。研究成果可直接应用于大跨钢框架结构的防火涂料设计。
Abstract:To investigate the damage mechanism of the thick coating in the steel frames under earthquake, one small-scale experiment was conducted. The failure modes and positions of the thick coating in the steel beam and columns were observed in detail. The inter-story displacement angle, beam, and column strain of steel frame structure under earthquake were obtained, and the relationship between inter-story displacement angle, strain, and the failure of the coating was analyzed. Based on the software ABAQUS, the elastoplastic damage model was used to predict the damage and fell-off behavior of the coating. In addition, the fell off and the failure mechanism of the thick coating in one steel column reported by the literature and the beam, column, and connection of the present steel frame were analyzed, and a comparison between the theoretical and experimental results was conducted. Results showed that the coating fell off on the web of the beam and the column did not occur, and it easily occurred on the beam-column connection, particularly near the connection region and the top flange of the beam. According to the strains of beam and column under earthquake, it was found that the position beyond the steel yield strain was corresponding to the part where the coating falls off. The Numerical results showed that the steel strain exceeded the yield strain or the inter-story drift ratio exceeded 1/150, and the coating fell off often occurred. Therefore, the elastoplastic damage model can reasonably predict the thick coating falling off. Meanwhile, the coating equivalent plastic strain distribution, the fell off position and the steel equivalent plastic strain conformed to the Mises stress distribution. In other words, larger steel equivalent strain and the Mises stress easily led to the coating fell off. It was found that the coating equivalent strain has an important effect on its fell off, and the thick coating effective plastic failure strain 0.002 could be used in the numerical analysis. In all, the presented results can be used in the coating design of the large-span steel frame, and thus it has a larger engineering application value.
文章编号：202100768 中图分类号：TU398.5 文献标志码：
基金项目:中国建筑科学研究院有限公司科研基金项目（20190111330730002）
| 作者 | 单位 | |
| 邱仓虎 | 中国建筑科学研究院有限公司，北京 100013 住房和城乡建设部防灾研究中心，北京 100013 | qiuch@vip.sina.com |
| 张耕源 | 中国建筑科学研究院有限公司，北京 100013 | zhagy10@126.com |
| 焦冰 | 中国建筑科学研究院有限公司，北京 100013 | |
| 王勇 | 中国矿业大学 深部岩土力学与地下工程国家重点试验室，江苏 徐州 221008 |
作者简介:第一作者：邱仓虎（1962—），男，教授级高级工程师. 研究方向：防灾减灾与结构设计. E-mail：qiuch@vip.sina.com;通信作者：张耕源, E-mail：zhagy10@126.com
引用文本：
邱仓虎,张耕源,焦冰,王勇.地震作用下缩尺钢框架结构防火涂料损伤试验及数值分析[J].工程科学与技术,2022,54(5):36-50.
QIU Canghu,ZHANG Gengyuan,JIAO Bing,WANG Yong.Experimental and Numerical Analysis on Damage Mechanism of Fire-redardant Coating in Small-scale Steel Frame Under Earthquake[J].Advanced Engineering Sciences,2022,54(5):36-50.
引用文本：
邱仓虎,张耕源,焦冰,王勇.地震作用下缩尺钢框架结构防火涂料损伤试验及数值分析[J].工程科学与技术,2022,54(5):36-50.
QIU Canghu,ZHANG Gengyuan,JIAO Bing,WANG Yong.Experimental and Numerical Analysis on Damage Mechanism of Fire-redardant Coating in Small-scale Steel Frame Under Earthquake[J].Advanced Engineering Sciences,2022,54(5):36-50.