复合配筋预应力混凝土管桩抗弯性能试验和数值分析
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摘要
开发研制了复合配筋(GFRP筋)预应力混凝土管桩(以下简称PRC-G桩),并进行了抗弯性能的现场抗弯试验和数值分析。试验研究结果表明,GFRP筋可以明显改善常规管桩的抗弯性能,其开裂荷载和极限荷载均有显著的提高,破坏时PRC-G桩均是受压区混凝土破碎而PRC桩的预应力筋被拉断;数值分析结果表明,PRC桩破坏时,预应力钢筋达到屈服强度1 420 MPa,PRC桩受压区混凝土未达到标准抗压强度,桩身未被破坏; PRC-G桩破坏时,受压区混凝土最大压应力为52.03 MPa,受压区混凝土破碎,管桩破坏。抗弯数值模拟和抗弯试验的结果表明,两者的荷载挠度曲线的规律基本一致。研究成果可为复合配筋(GFRP筋)预应力混凝土管桩在工程中的推广应用提供理论依据。
The flexural capacity of compositely reinforced( GFRP) pre-stressed concrete pipe pile are studied through test and numerical analysis. Glass fiber reinforced polymer( GFRP) has some properties such as lightweight,high tensile strength and strong in corrosion resistance,which can be exerted the high strength properties through joining with concrete by the common power mechanisms. The bending test shows that GFRP evidently improves the flexural properties,the cracking load and the ultimate load of PRC-G piles all increase to different extent. Concrete compression zone of PRC-G piles is broken and tendons of PRC piles are pulled off. In addition,based on the data from numerical analysis,the pre-stressed reinforcement reaches the yield strength( 1 420 MPa) when PRC piles are damaged,and the compressive strength of concrete does not meet the standard compressive strength,while the pile body is not damaged. However,the maximum compressive stress of compressive concrete zone is 52.03 MPa while the pile is damaged. The results of bending numerical simulation and test show that the load deflection curves are consistent. Meanwhile,research results can provide the theory basis for the popularization and application in engineering of composite reinforcement( GFRP) pre-stressed concrete pipe pile.
The flexural capacity of compositely reinforced( GFRP) pre-stressed concrete pipe pile are studied through test and numerical analysis. Glass fiber reinforced polymer( GFRP) has some properties such as lightweight,high tensile strength and strong in corrosion resistance,which can be exerted the high strength properties through joining with concrete by the common power mechanisms. The bending test shows that GFRP evidently improves the flexural properties,the cracking load and the ultimate load of PRC-G piles all increase to different extent. Concrete compression zone of PRC-G piles is broken and tendons of PRC piles are pulled off. In addition,based on the data from numerical analysis,the pre-stressed reinforcement reaches the yield strength( 1 420 MPa) when PRC piles are damaged,and the compressive strength of concrete does not meet the standard compressive strength,while the pile body is not damaged. However,the maximum compressive stress of compressive concrete zone is 52.03 MPa while the pile is damaged. The results of bending numerical simulation and test show that the load deflection curves are consistent. Meanwhile,research results can provide the theory basis for the popularization and application in engineering of composite reinforcement( GFRP) pre-stressed concrete pipe pile.
引文
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[8]张忠苗,刘俊伟,谢志专,等.新型混凝土管桩抗弯剪试验研究[J].岩土工程学报,2011,33(增2):271-276.(Zhang Zhongmiao,Liu Junwei,Xie Zhizhuan,et al.Experimental study on flexural and shearing properties of modified concrete pipe piles[J].Chinese Journal of Geotechnical Engineering,2011,33(Supp.2):271-276.(in Chinese))
[9]张仕,李欢秋,王爱勋.提高PHC管桩在深基坑支护中应用的技术途径[J].地下空间与工程学报,2011,7(增2):271-276.(Zhang Shi,Li Huanqiu,Wang Aixun.Technical approaches to improvement of application of PHC pile in deep foundation pit[J].Chinese Journal of Underground Space and Engineering,2011,7(Supp.2):1643-1647.(in Chinese))
[10]叶列平.土木工程科学前沿[M].北京:清华大学出版社,2006.(Ye Lieping.Frontier and development in civil engineering[M].Beijing:Press of Tsinghua University,2006.(in Chinese))
[11]中华人民共和国住房和城乡建设部.玻璃纤维复合材料建设工程应用技术规程(GB50608-2010)[S].北京:中国计划出版社,2011.(Ministry of Housing and Urban-rural Development of People’s Republic of China.Technical code for infrastructure application of FRP composites(GB50608-2010)[S].Beijing:China Planning Press,2011.(in Chinese))
[12]中国国家标准化管理委员会.先张法预应力混凝土管桩(GB13476-2009)[S].北京:中国标准出版社,2009.(Standardization Administration of China.Pretensioned spun concrete piles(GB13476-2009)[S].Beijing:Standards Press of China,2009.(in Chinses))
[2]张学文,黎夏至,李维涛,等.抗拔预应力管桩地下车库上浮案例检测浅析[J].地下空间与工程学报,2011,7(增1):1409-1414.(Zhang Xuewen,Li Xiazhi,Li Weitao,et al.Site testing and analysis on floating upward case of underground garage using up-lift PHCpiles[J].Chinese Journal of Underground Space and Engineering,2011,7(Suup.1):1409-1414.(in Chinese))
[3]吴彤,许健,钱文君,等.多年冻土区管桩基础抗拔承载性能试验研究[J].地下空间与工程学报,2018,14(1):145-153.(Wu Tong,Xu Jian,Qian Wenjun,et al.Experimental research on uplift mechanism of pipe pile foundation in permafrost area[J].Chinese Journal of Underground Space and Engineering,2018,14(1):145-153.(in Chinese))
[4]郭杨,崔伟.PHC管桩在老黏土地区应用的试验研究[J].岩土工程学报,2011,33(增2):108-115.(Guo Yang,Cui Wei.Experimental study on application of PHC piles in paleo-clay area[J].Chinese Journal of Geotechnical Engineering,2011,33(Supp.2):108-115.(in Chinese))
[5]柳炳康,李建宏,张星宇,等.预应力填芯混凝土管桩抗弯性能与延性特征的试验[J].工业建筑,2007,37(3):46-50.(Liu Bingkang,Li Jianhong,Zhang Xingyu.Test of moment bearing capacity and ductility performance of filled pretressed concrete pipe pile[J].Industrial Constuction,2007,37(3):46-50.(in Chinese))
[6]卓杨,曹进捷,邱松.大直径离心钢管混凝土管桩抗弯承载力研究[J].岩土工程学报,2011,33(增2):135-138.(Zhuo Yang,Cao Jinjie,Qiu Song.Flexural capacity of large-diameter thin-wall steel and spun concrete composite piles[J].Chinese Journal of Geotechnical Engineering,2011,33(Supp.2):135-138.(in Chinese))
[7]张忠苗,刘俊伟,邹健,等.加强型预应力混凝土管桩抗弯剪试验研究[J].浙江大学学报(工学版),2011,45(6):1074-1080.(Zhang Zhongmiao,Liu Junwei,Zou Jian,et al.Experimental study on flexural and shearing property of reinforced prestressed concrete pipe pile[J].Journal of Zhejiang University(Engineering Science Edition),2011,45(6):1074-1080.(in Chinese))
[8]张忠苗,刘俊伟,谢志专,等.新型混凝土管桩抗弯剪试验研究[J].岩土工程学报,2011,33(增2):271-276.(Zhang Zhongmiao,Liu Junwei,Xie Zhizhuan,et al.Experimental study on flexural and shearing properties of modified concrete pipe piles[J].Chinese Journal of Geotechnical Engineering,2011,33(Supp.2):271-276.(in Chinese))
[9]张仕,李欢秋,王爱勋.提高PHC管桩在深基坑支护中应用的技术途径[J].地下空间与工程学报,2011,7(增2):271-276.(Zhang Shi,Li Huanqiu,Wang Aixun.Technical approaches to improvement of application of PHC pile in deep foundation pit[J].Chinese Journal of Underground Space and Engineering,2011,7(Supp.2):1643-1647.(in Chinese))
[10]叶列平.土木工程科学前沿[M].北京:清华大学出版社,2006.(Ye Lieping.Frontier and development in civil engineering[M].Beijing:Press of Tsinghua University,2006.(in Chinese))
[11]中华人民共和国住房和城乡建设部.玻璃纤维复合材料建设工程应用技术规程(GB50608-2010)[S].北京:中国计划出版社,2011.(Ministry of Housing and Urban-rural Development of People’s Republic of China.Technical code for infrastructure application of FRP composites(GB50608-2010)[S].Beijing:China Planning Press,2011.(in Chinese))
[12]中国国家标准化管理委员会.先张法预应力混凝土管桩(GB13476-2009)[S].北京:中国标准出版社,2009.(Standardization Administration of China.Pretensioned spun concrete piles(GB13476-2009)[S].Beijing:Standards Press of China,2009.(in Chinses))