CFRP加固受火后预应力混凝土空心板的计算方法和参数分析
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- 英文论文题名：Theoretical Calculation and Parametric Analysis on Post-fire Pre-stressed Concrete Hollow Core Slab Strengthened with CFRP
- 论文作者：胡克旭 ; 董思卫 ; 王玉珏
- 英文论文作者：HU Kexu ; DONG Siwei ; WANG Yujue ; Research Institute of Structural Engineering and Disaster Reduction ; Tongji University
- 年：2016
- 作者机构：同济大学结构工程与防灾研究所;
- 论文关键词：预应力混凝土空心板 ; 碳纤维布加固 ; 受火后 ; 计算方法 ; 参数分析
- 英文论文关键词：PC hollow core slab ; strengthened with CFRP ; post-fire ; theoretical calculation ; parametric analysis
- 会议召开时间：2016-10-27
- 会议录名称：第九届全国防震减灾工程学术研讨会论文集
- 语种：中文
- 分类号：TU378.5
- 学会代码：OGTY
- 会议名称：第九届全国防震减灾工程学术研讨会
- 会议地点：中国安徽合肥
- 主办单位：中国土木工程学会、中国工程院土木、水利与建筑工程学部、中国土木工程学会防震减灾工程技术推广委员会、合肥工业大学、安徽省住房和城乡建设厅
- 学会名称：中国土木工程学会
- 页数：9
- 文件大小：399k
- 原文格式：O
- 会议级别：全国
摘要
基于课题组前期对CFRP加固受火后预应力混凝土空心板的受力性能试验研究,提出了受火加固后的预应力混凝土空心板极限承载力的等效截面计算方法,同时针对影响受火后预应力混凝土空心板加固效果和破坏模式的参数进行了一系列分析。与试验结果对比表明,在考虑受火温度对材料进行强度折减后,提出的等效截面计算方法是可行的;CFRP加固量、CFRP覆盖率和板的前期受火时间对加固构件的承载力和破坏模式都有不同程度的影响。在实际加固工程中,应避免因加固量过大而发生剪切破坏;同时还应尽量增大加固时CFRP覆盖率,以充分利用CFRP材料的抗拉性能。
Based on the early experimental research on post-fire pre-stressed concrete hollow core slab strengthened with Carbon Fiber Reinforced Polymer(CFRP),this paper proposes an equivalent calculation method for ultimate bearing capacity of the strengthened PC hollow core slab,and carries on a series of analysis on different parameters influencing the performances of strengthened PC hollow core slabs.The predictions of ultimate bearing capacity of strengthened slabs were in close agreement with the test results after taking the strength reduction of material into consideration.Parametric analysis results show that the amount ratio and the coverage ratio of CFRP have different influence on the bearing capacity and failure modes of the strengthened members.It is necessary to choose the reasonable amount ratio to avoid the occurrence of shear failure due to excessive reinforcement.The high coverage ratio of CFRP can make full use of its tensile strength.
Based on the early experimental research on post-fire pre-stressed concrete hollow core slab strengthened with Carbon Fiber Reinforced Polymer(CFRP),this paper proposes an equivalent calculation method for ultimate bearing capacity of the strengthened PC hollow core slab,and carries on a series of analysis on different parameters influencing the performances of strengthened PC hollow core slabs.The predictions of ultimate bearing capacity of strengthened slabs were in close agreement with the test results after taking the strength reduction of material into consideration.Parametric analysis results show that the amount ratio and the coverage ratio of CFRP have different influence on the bearing capacity and failure modes of the strengthened members.It is necessary to choose the reasonable amount ratio to avoid the occurrence of shear failure due to excessive reinforcement.The high coverage ratio of CFRP can make full use of its tensile strength.
引文
[1]王玉珏,CFRP及TRM加固受火后预应力混凝土空心板受力性能研究[D].上海:同济大学,2015(Wang Yujue.Study on the Performance of Prestressed Concrete Hollow Core Slabs Strengthened with CFRP and TRM after Fire[D].Shanghai:Tongji University,2015(in Chinese)).
[2]韩重庆,许清风,李向民,等.预制空心板受火后力学性能试验研究[J].建筑结构学报,2012,33(9):112-118(Han Chongqing,Xu Qingfeng,Li Xiangmin,el al.Experimental research on mechanical behavior of PC hollow-core slab exposed to fire[J].Journal of Building Structure,2012,33(9):112-118(in Chinese)).
[3]全威,张富文,许清风,等.预制空心板受火后力学性能的试验研究[J].防灾减灾工程学报,2012,32(增刊):82~86(Quan Wei,Zhang Fuwen,Xu Qingfeng,et al.An experimental study on mechanical behavior of PC hollow-core slab exposed to fire[J].Journal of Disaster Prevention and Mitigation Engineering,2012,32(S):82-86(in Chinese)).
[4]李向民,陈振龙,许清风,等.受火后冷拔低碳钢丝预制空心板受弯性能试验研究[J].结构工程师,2013,29(3):121-126(Li Xiangmin.Chen Zhenlong,Xu Qingfeng,el al.Flexural Behaviors of PC Hollow-core Slab with Cold-drawn Low-carbon Wire after Fire[J].Structural Engineers,2013,29(3):121-126).
[5]纤维增强复合材料建设工程应用技术规范(GB50608-2010)[S].北京:中国计划出版社,2010(GB50608-2010 Technical code for infrastructure application of FRP composites[S].Beijing:China planning press(in Chinese)).
[6]碳纤维片材加固修复混凝土结构技术规程(CECS146:2003)[S].北京:中国建筑工业出版社,2007(CECS146:2003 Technical specification for strengthening concrete structures with carbon fiber reinforced polymer laminate[S].Beijing:China Architecture and Building Press(in Chinese)).
[7]刘宜良,碳纤维及叠合层加固预制空心板受力性能研究[D].上海:同济大学,2014(Liu Yiliang.Study on the performance of prestressed concrete hollow core slabs strengthened with CFRP and composite reinforcement layer[D].Shanghai:Tongji University,2014(in Chinese)).
[8]彭小丽.CFRP加固火灾后钢筋混凝土梁抗剪性能的试验研究[D].厦门:华侨大学,2013(Peng Xiaoli.Experimental Study on Shear Performance of Reinforced Concrete Beams after Fire Damage and Strengthened with CFRP[D].Xiamen:Tongji University,2013(in Chinese)).
[9]混凝土结构设计规范(GB50010-2010)[S].北京:中国建筑工业出版社,2009.6(GB 50010-2010Code for design of concrete structures[S].Beijing:China Architecture and Building Press,201K in Chinese)).
[10]郑文忠,侯晓萌,陈伟宏.火灾后预应力混凝土简支板力学性能试验[J].哈尔滨工业大学学报,2011,02:8-13.(Zheng Wenzhong,Hou Xiaomeng,Chen Weihong.Experiment and analysis on mechanical performance of prestressed concrete simply-supported slab after elevated temperature[J].Journal of Harbin Institute of Technology,2011,02:8-13(in Chinese)).
[2]韩重庆,许清风,李向民,等.预制空心板受火后力学性能试验研究[J].建筑结构学报,2012,33(9):112-118(Han Chongqing,Xu Qingfeng,Li Xiangmin,el al.Experimental research on mechanical behavior of PC hollow-core slab exposed to fire[J].Journal of Building Structure,2012,33(9):112-118(in Chinese)).
[3]全威,张富文,许清风,等.预制空心板受火后力学性能的试验研究[J].防灾减灾工程学报,2012,32(增刊):82~86(Quan Wei,Zhang Fuwen,Xu Qingfeng,et al.An experimental study on mechanical behavior of PC hollow-core slab exposed to fire[J].Journal of Disaster Prevention and Mitigation Engineering,2012,32(S):82-86(in Chinese)).
[4]李向民,陈振龙,许清风,等.受火后冷拔低碳钢丝预制空心板受弯性能试验研究[J].结构工程师,2013,29(3):121-126(Li Xiangmin.Chen Zhenlong,Xu Qingfeng,el al.Flexural Behaviors of PC Hollow-core Slab with Cold-drawn Low-carbon Wire after Fire[J].Structural Engineers,2013,29(3):121-126).
[5]纤维增强复合材料建设工程应用技术规范(GB50608-2010)[S].北京:中国计划出版社,2010(GB50608-2010 Technical code for infrastructure application of FRP composites[S].Beijing:China planning press(in Chinese)).
[6]碳纤维片材加固修复混凝土结构技术规程(CECS146:2003)[S].北京:中国建筑工业出版社,2007(CECS146:2003 Technical specification for strengthening concrete structures with carbon fiber reinforced polymer laminate[S].Beijing:China Architecture and Building Press(in Chinese)).
[7]刘宜良,碳纤维及叠合层加固预制空心板受力性能研究[D].上海:同济大学,2014(Liu Yiliang.Study on the performance of prestressed concrete hollow core slabs strengthened with CFRP and composite reinforcement layer[D].Shanghai:Tongji University,2014(in Chinese)).
[8]彭小丽.CFRP加固火灾后钢筋混凝土梁抗剪性能的试验研究[D].厦门:华侨大学,2013(Peng Xiaoli.Experimental Study on Shear Performance of Reinforced Concrete Beams after Fire Damage and Strengthened with CFRP[D].Xiamen:Tongji University,2013(in Chinese)).
[9]混凝土结构设计规范(GB50010-2010)[S].北京:中国建筑工业出版社,2009.6(GB 50010-2010Code for design of concrete structures[S].Beijing:China Architecture and Building Press,201K in Chinese)).
[10]郑文忠,侯晓萌,陈伟宏.火灾后预应力混凝土简支板力学性能试验[J].哈尔滨工业大学学报,2011,02:8-13.(Zheng Wenzhong,Hou Xiaomeng,Chen Weihong.Experiment and analysis on mechanical performance of prestressed concrete simply-supported slab after elevated temperature[J].Journal of Harbin Institute of Technology,2011,02:8-13(in Chinese)).