预应力混凝土管桩轴心受压承载力计算
|
摘要
目的为准确考虑预应力钢筋产生的混凝土剩余预压应力的影响,提出预应力混凝土管桩轴心受压承载力计算公式,为编制黑龙江地区桩基础技术规范提供依据.方法考虑成桩工艺系数和预应力钢筋产生的混凝土剩余预压应力的影响,根据混凝土正截面承载力计算的基本假定中应力-应变的关系以及力的平衡和变形协调原则,推导预应力混凝土管桩正截面轴心受压承载力计算公式,并与国标图集《预应力混凝土管桩》(10G 409)进行对比分析.结果采用预应力混凝土管桩轴心受压承载力公式计算时,成桩工艺系数取0.85,对PHC桩和PC桩,混凝土剩余预压应力系数取值分别为0.56和0.60,对于常用的A型和AB型PHC桩,其承载力比采用国标图集《预应力混凝土管桩》(10G 409)的提高8%~12%.结论采用推荐公式和设计建议计算的管桩轴心受压承载力与国标图集《预应力混凝土管桩》(10G 409)相比具有一定的提高,为预应力混凝土管桩在黑龙江地区合理的推广应用提供技术支持.
In order to consider the influence of concrete residual prepressing stress produced by prestressed reinforcement,a calculation formula for bearing capacity of the prestressed concrete pipe pile under axial compression was proposed,which can provide references for compiling the technical code of pile foundation in the Heilongjiang area. Considering influences of the pile construction process coefficient and the concrete residual preloading stress caused by prestressed reinforcement,according to the stress-strain relationship in the basic assumption for calculating normal section bearing capacity of concrete and the principle of force balance and deformation compatibility,a formula for calculating bearing capacity of prestressed concrete pipe pile under normal section axialcompression was derived. Calculated results were compared with the national standard "Prestressed concrete pipe "( 10 G 409). Results show that when the pile construction process coefficient is0. 85,the concrete residual preloading stress coefficient is 0. 56 and 0. 60 for PHC pile and PC pile,respectively,for the commonly used type A and type AB,the bearing capacities calculated by the proposed formula are raised by 8% ~ 12%,compared with the national standard "Prestressed concrete pipe"( 10 G 409). Conclusion is that the calculated bearing capacity for the prestressed concrete pipe pile under axial compression has a certain increase compared with the national standard "Prestressed concrete pipe"( 10 G 409). The obtained formula can provide technical supports for reasonable popularization and application of the prestressed concrete pipe pile in the Heilongjiang area.
In order to consider the influence of concrete residual prepressing stress produced by prestressed reinforcement,a calculation formula for bearing capacity of the prestressed concrete pipe pile under axial compression was proposed,which can provide references for compiling the technical code of pile foundation in the Heilongjiang area. Considering influences of the pile construction process coefficient and the concrete residual preloading stress caused by prestressed reinforcement,according to the stress-strain relationship in the basic assumption for calculating normal section bearing capacity of concrete and the principle of force balance and deformation compatibility,a formula for calculating bearing capacity of prestressed concrete pipe pile under normal section axialcompression was derived. Calculated results were compared with the national standard "Prestressed concrete pipe "( 10 G 409). Results show that when the pile construction process coefficient is0. 85,the concrete residual preloading stress coefficient is 0. 56 and 0. 60 for PHC pile and PC pile,respectively,for the commonly used type A and type AB,the bearing capacities calculated by the proposed formula are raised by 8% ~ 12%,compared with the national standard "Prestressed concrete pipe"( 10 G 409). Conclusion is that the calculated bearing capacity for the prestressed concrete pipe pile under axial compression has a certain increase compared with the national standard "Prestressed concrete pipe"( 10 G 409). The obtained formula can provide technical supports for reasonable popularization and application of the prestressed concrete pipe pile in the Heilongjiang area.
引文
[1]HUANG Jinlin,LI Zhangming,TANG Guihe.Application of the catastrophe theory in ascertainment of vertical bearing capacity of single pile[J].Kybernetes,2008,37(9/10):1383-1392.
[2]CUI Zhendong.Bearing capacity of single pileand in-flight T-bar penetration for centrifuge modeling of land subsidence caused by the interaction of high-rise buildings[J].Bulletin of engineering geology and the environment,2012,71(3):579-586.
[3]左宏亮,刘景云,李国东,等.松花江漫滩地区静压PHC管桩竖向承载力[J].沈阳建筑大学学报(自然科学版),2009(6):1088-1093.(ZUO Hongliang,LIU Jingyun,LI Guodong,et al.Study on vertical bearing capacity of jacked-in PHC pipe pile in Songhua river floodplain areas[J].Journal of shenyang jianzhu university(natural science),2009(6):1088-1093.
[4]周静海,杨永生,焦霞.再生混凝土柱轴心受压承载力研究[J].沈阳建筑大学学报(自然科学版),2008(4):572-576.(ZHOU Jinghai,YANG Yongsheng,JIAO Xia.Study on axial pressure bearing capacity of recycled concrete columns[J].Journal of shenyang jianzhu university(natural science),2014(2):2008(4):572-576.
[5]ZUO Hongliang,WANG Lei,GAO Hongying,et al.Study on vertical bearing capacity and time effect of the Jacked-in PHC pipe pile in the cohesive soil area[J].Advanced materials research,2012,368/373:2706-2710.
[6]SU Erwei.PHC pile bearing capacity and application[J].Advanced materials research,2012,476/477/478:759-762.
[7]CAI Guojun,LIU Songyu,Anand J,et al.Evaluation of pile bearing capacity from piezocone penetration test data in soft Jiangsu quaternary clay deposits[J].M arine georesources&geotechnology,2011,29(3):177-201.
[8]TAM C M,THOMAS K L T,TONY C T L.Diagnosis of prestressed concrete pile defects using probabilistic neural netw orks[J].Engineering structures,2004,26(8):1155-1162.
[9]KANG Jingwen.Vertical bearing capacity of driven PHC piles in the Chengdu gravel foundation[J].Chinese journal of geotechnical engineering,2010,32:107-110.
[10]YANG Yuwen.Estimation of ultimate bearingcapacity of single pile with golden section[J].Chinese journal of rock mechanics and engineering,2009,28:3577-3584.
[11]辽宁省土木建筑学会.预应力混凝土管桩基础技术规程:DB21/T 1565—2007[S].沈阳:辽宁科学技术出版社,2008.(Academy of Architecture and Civil Engineering.Technical regulation for prestressed concrete pipe pile foundation:DB21/T 1565—2007[S].Shenyang:Liaoning Science and Technology Press,2008.)
[12]中国建筑科学研究院,上海建筑设计研究院有限公司.预应力混凝土空心方桩:08SG 360[S].北京:中国计划出版社,2009.(China Academy of Building Research,Shanghai Architectural Design Institute Limited Company.Prestressed concrete hollow square pile:08SG 360[S].Beijing:China Planning Press,2009.)
[13]连云港市建筑设计研究院有限责任公司.预应力混凝土管桩:苏G 03—2012[S].南京:江苏科学技术出版社,2012.(Architectural Design and Research Institute Company with limited liability of Lianyungang City.Prestressed concrete pipe pile:Su G 03—2012[S].Nanjing:Jiangsu Science and Technology Press,2012.)
[14]江苏省住房和城乡建设厅.先张法预应力混凝土管桩基础技术规程:DGJ32/TJ109—2010[S].南京:江苏科学技术出版社,2010.(Department of Housing and Urban-rural Construction of Jiangsu Province.Technical regulation for pretensioning prestressed concrete pipe pile foundation:DGJ32/TJ109—2010[S].Nanjing:Jiangsu Science and Technology Press,2010.)
[15]苏州中材建筑建材设计研究院.预应力混凝土管桩:10G409[S].北京:中国计划出版社,2010.(Suzhou Architecture Design and Research Institute of Building M aterials.Prestressed concrete pipe pile:10G409[S].Beijing:China Planning Press,2010.)
[16]南京华东建筑工程设计有限公司.先张法预应力离心混凝土空心方桩:苏G/T 17—2012[S].南京:江苏科学技术出版社,2012.(Construction Engineering Design Limited Company of East China in Nanjing.Hollow square pile with pretensioning prestressed centrifugal concrete:G/T 17—2012[S].Nanjing:Jiangsu Science and Technology Press,2012.)
[17]广东省建筑设计研究院.锤击式预应力混凝土管桩基础技术规程:DBJ/T 15-22—2008[S].北京:中国建筑工业出版社,2009.(Architectural Design and Research Institute of Guangdong Province.Specification for driven prestressed concrete tube-pile foundation:DBJ/T 15-22—2008[S].Beijing:China Building Industry Press,2009.)
[18]云南省工程质量监督管理站.先张法预应力混凝土管桩基础技术规程:DBJ 53/T-22—2007[S].昆明:云南科技出版社,2008.(Engineering Quality Supervision and Management Station of Yunnan Province.Technical regulation for pretensioning prestressed concrete pipe pile foundation:DBJ 53/T-22—2007[S].Kunming:Yunnan Science Press,2008.)
[19]中华人民共和国建设部.建筑地基基础设计规范:GB50007—2011[S].北京:中国建筑工业出版社,2011.(Ministry of Construction of the People's Republic of China.Design code for building foundation:GB 50007—2011[S].Beijing:China Building Industry Press,2011.)
[20]中华人民共和国建设部.建筑桩基技术规范:JGJ94—2008[S].北京:中国建筑工业出版社,2008.(Ministry of Construction of the People's Republic of China.Technical code for building pile foundation:JGJ94—2008[S].Beijing:China Building Industry Press,2008.)
[2]CUI Zhendong.Bearing capacity of single pileand in-flight T-bar penetration for centrifuge modeling of land subsidence caused by the interaction of high-rise buildings[J].Bulletin of engineering geology and the environment,2012,71(3):579-586.
[3]左宏亮,刘景云,李国东,等.松花江漫滩地区静压PHC管桩竖向承载力[J].沈阳建筑大学学报(自然科学版),2009(6):1088-1093.(ZUO Hongliang,LIU Jingyun,LI Guodong,et al.Study on vertical bearing capacity of jacked-in PHC pipe pile in Songhua river floodplain areas[J].Journal of shenyang jianzhu university(natural science),2009(6):1088-1093.
[4]周静海,杨永生,焦霞.再生混凝土柱轴心受压承载力研究[J].沈阳建筑大学学报(自然科学版),2008(4):572-576.(ZHOU Jinghai,YANG Yongsheng,JIAO Xia.Study on axial pressure bearing capacity of recycled concrete columns[J].Journal of shenyang jianzhu university(natural science),2014(2):2008(4):572-576.
[5]ZUO Hongliang,WANG Lei,GAO Hongying,et al.Study on vertical bearing capacity and time effect of the Jacked-in PHC pipe pile in the cohesive soil area[J].Advanced materials research,2012,368/373:2706-2710.
[6]SU Erwei.PHC pile bearing capacity and application[J].Advanced materials research,2012,476/477/478:759-762.
[7]CAI Guojun,LIU Songyu,Anand J,et al.Evaluation of pile bearing capacity from piezocone penetration test data in soft Jiangsu quaternary clay deposits[J].M arine georesources&geotechnology,2011,29(3):177-201.
[8]TAM C M,THOMAS K L T,TONY C T L.Diagnosis of prestressed concrete pile defects using probabilistic neural netw orks[J].Engineering structures,2004,26(8):1155-1162.
[9]KANG Jingwen.Vertical bearing capacity of driven PHC piles in the Chengdu gravel foundation[J].Chinese journal of geotechnical engineering,2010,32:107-110.
[10]YANG Yuwen.Estimation of ultimate bearingcapacity of single pile with golden section[J].Chinese journal of rock mechanics and engineering,2009,28:3577-3584.
[11]辽宁省土木建筑学会.预应力混凝土管桩基础技术规程:DB21/T 1565—2007[S].沈阳:辽宁科学技术出版社,2008.(Academy of Architecture and Civil Engineering.Technical regulation for prestressed concrete pipe pile foundation:DB21/T 1565—2007[S].Shenyang:Liaoning Science and Technology Press,2008.)
[12]中国建筑科学研究院,上海建筑设计研究院有限公司.预应力混凝土空心方桩:08SG 360[S].北京:中国计划出版社,2009.(China Academy of Building Research,Shanghai Architectural Design Institute Limited Company.Prestressed concrete hollow square pile:08SG 360[S].Beijing:China Planning Press,2009.)
[13]连云港市建筑设计研究院有限责任公司.预应力混凝土管桩:苏G 03—2012[S].南京:江苏科学技术出版社,2012.(Architectural Design and Research Institute Company with limited liability of Lianyungang City.Prestressed concrete pipe pile:Su G 03—2012[S].Nanjing:Jiangsu Science and Technology Press,2012.)
[14]江苏省住房和城乡建设厅.先张法预应力混凝土管桩基础技术规程:DGJ32/TJ109—2010[S].南京:江苏科学技术出版社,2010.(Department of Housing and Urban-rural Construction of Jiangsu Province.Technical regulation for pretensioning prestressed concrete pipe pile foundation:DGJ32/TJ109—2010[S].Nanjing:Jiangsu Science and Technology Press,2010.)
[15]苏州中材建筑建材设计研究院.预应力混凝土管桩:10G409[S].北京:中国计划出版社,2010.(Suzhou Architecture Design and Research Institute of Building M aterials.Prestressed concrete pipe pile:10G409[S].Beijing:China Planning Press,2010.)
[16]南京华东建筑工程设计有限公司.先张法预应力离心混凝土空心方桩:苏G/T 17—2012[S].南京:江苏科学技术出版社,2012.(Construction Engineering Design Limited Company of East China in Nanjing.Hollow square pile with pretensioning prestressed centrifugal concrete:G/T 17—2012[S].Nanjing:Jiangsu Science and Technology Press,2012.)
[17]广东省建筑设计研究院.锤击式预应力混凝土管桩基础技术规程:DBJ/T 15-22—2008[S].北京:中国建筑工业出版社,2009.(Architectural Design and Research Institute of Guangdong Province.Specification for driven prestressed concrete tube-pile foundation:DBJ/T 15-22—2008[S].Beijing:China Building Industry Press,2009.)
[18]云南省工程质量监督管理站.先张法预应力混凝土管桩基础技术规程:DBJ 53/T-22—2007[S].昆明:云南科技出版社,2008.(Engineering Quality Supervision and Management Station of Yunnan Province.Technical regulation for pretensioning prestressed concrete pipe pile foundation:DBJ 53/T-22—2007[S].Kunming:Yunnan Science Press,2008.)
[19]中华人民共和国建设部.建筑地基基础设计规范:GB50007—2011[S].北京:中国建筑工业出版社,2011.(Ministry of Construction of the People's Republic of China.Design code for building foundation:GB 50007—2011[S].Beijing:China Building Industry Press,2011.)
[20]中华人民共和国建设部.建筑桩基技术规范:JGJ94—2008[S].北京:中国建筑工业出版社,2008.(Ministry of Construction of the People's Republic of China.Technical code for building pile foundation:JGJ94—2008[S].Beijing:China Building Industry Press,2008.)