侧向冲击后钢管混凝土柱剩余轴压承载力研究
Residual Axial Bearing Capacity of Concrete-Filled Steel Tubular Columns After Lateral Impact
付朝江 1高颖 1陈华艳 1罗才松 1王碧珍 2林友峰 3张泽群4
作者信息
- 1. 福建理工大学福建省土木工程新技术与信息化重点实验室,福州 350118
- 2. 福建省中霖工程建设有限公司,福建南平 353599
- 3. 福建省富旺建设有限公司,福州 350108
- 4. 侨智建设有限公司,福州 350009
- 折叠
摘要
为研究钢管混凝土柱受侧向冲击后的剩余承载力,进行了冲击后钢管混凝土柱的轴压试验,运用ABAQUS有限元软件对冲击后钢管混凝土柱轴压试验进行了数值模拟,并验证了有限元模型的合理性.分析轴压过程中典型钢管混凝土柱的受力性能,研究混凝土强度等级、冲击质量、冲击高度、钢管强度等级、冲击位置、边界条件和长径比对受冲击后钢管混凝土柱剩余承载力的影响.结果表明:混凝土强度等级对剩余承载力影响较小,当从C50增大C65时,剩余承载力仅提高了 1.44％;当冲击质量从330 kg增大到630 kg时,剩余承载力减小了 10.64％;冲击高度由4 m增大到7 m时,剩余承载力减小了 10.15％;采用Q420钢材的钢管混凝土柱的剩余承载力比采用Q235钢材的钢管混凝土柱的相应值提高了 39.54％;冲击位置越靠近跨中,剩余承载力越小;随着边界条件的自由度增加,剩余承载力减小.给出了冲击后钢管混凝土柱的剩余承载力公式.
Abstract
In order to study the residual bearing capacity of concrete-filled steel tubular(CFST)column after lateral impact,the axial compression test of CFST column after impact was carried out,and a finite element analysis model of CFST column after impact under axial compression was built.The existing test data was used to validate the accuracy of the model.The mechanical performance of typical CFST column under axial compression was analyzed.The influence of parameters such as concrete strength grade,impact mass,impact height,steel pipe strength grade,impact position,boundary condition and length-diameter ratio on the residual bearing capacity of CFST column was studied.The results show that the concrete strength grade has little effect on the residual resistance.When the concrete strength increases from C50 to C65,the residual bearing capacity only increases by 1.44％.The residual bearing capacity decreases by 10.64％when the impact mass increases from 330 kg to 630 kg.When the impact height increases from 4 m to 7 m,the residual bearing capacity decreases by 10.15％.Compared with CFST column using Q235 steel,the residual bearing capacity of CFST column with Q420 steel increases by 39.54％.When the impact position is closer to the middle of the span,the residual bearing capacity gets smaller.With the increase of the degree of freedom in the boundary conditions,the residual bearing capacity decreases.Finally,a residual bearing capacity formula of the CFST column after impact is proposed in this paper.
关键词
钢管混凝土柱/有限元模拟/剩余承载力/冲击作用/轴压试验Key words
concrete-filled steel tubular(CFST)column/finite element simulation/residual bearing capacity/impact action/axial compression test引用本文复制引用
基金项目
福建省自然科学基金(2022J01928)
福建省自然科学基金(2020J01885)
福建省自然科学基金(2020J01940)
出版年
2024
国家科技期刊平台
NSTL
万方数据