基于长期损失灰色预测的竖向预应力控制
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摘要
基于陕西省某连续刚构桥实桥监测系统采集到的桥梁有效竖向预应力长期变化数据,以实测数据作为初始序建立灰色系统理论预测模型GM(1,1),分析竖向预应力损失随时间的变化规律,进行时间非等步距残差修正,提出竖向预应力长期损失预测模型.采用该模型预测竖向预应力长期损失占控制张拉力的比例为7.92%,与实桥监测的7.8%~8.2%基本吻合,表明若采用公路桥规设计张拉力的0.6倍作为竖向预应力施工控制标准,将导致桥梁后期有效竖向预应力达不到要求.建议施工过程中锚下应力控制应充分考虑长期损失效应影响,压浆前锚下有效应力不小于设计张拉力0.7倍为宜.这为竖向预应力施工及无损检测提供了理论依据和参考,对PC混凝土箱梁竖向预应力体系应用发展具有重要的理论意义及实用价值.
The paper based on the vertical prestress loss data of a concrete continuous rigid frame bridge collected by the real bridge monitoring system in Shaanxi province,establishes the grey theory forecasting model GM(1,1)with the measured data as the initial order,analyzes the law of vertical prestress loss with time,and puts forward long-term vertical prestress loss prediction formula.Using this model to predict the long-term loss of vertical prestress accounted for 7.92% of the control tension;and it is consistent with the 7.8%-8.2% of the actual bridge monitoring basically.The results show that if using the design of the highway bridge gauge,0.6times of the tension forces,as vertical prestress construction control standard,will cause the late effective vertical prestress bridge can not meet the requirements.Based on the research outcomes,effective stress under anchor in vertical prestress construction should be more than 0.7times of the designed stretch-draw force.The results provide a theoretical basis and reference for vertical prestress construction and NDE(nondestructive examination),and are of great importance of practical value for the application and development of vertical prestress system in prestressed concrete box-girder bridge.
The paper based on the vertical prestress loss data of a concrete continuous rigid frame bridge collected by the real bridge monitoring system in Shaanxi province,establishes the grey theory forecasting model GM(1,1)with the measured data as the initial order,analyzes the law of vertical prestress loss with time,and puts forward long-term vertical prestress loss prediction formula.Using this model to predict the long-term loss of vertical prestress accounted for 7.92% of the control tension;and it is consistent with the 7.8%-8.2% of the actual bridge monitoring basically.The results show that if using the design of the highway bridge gauge,0.6times of the tension forces,as vertical prestress construction control standard,will cause the late effective vertical prestress bridge can not meet the requirements.Based on the research outcomes,effective stress under anchor in vertical prestress construction should be more than 0.7times of the designed stretch-draw force.The results provide a theoretical basis and reference for vertical prestress construction and NDE(nondestructive examination),and are of great importance of practical value for the application and development of vertical prestress system in prestressed concrete box-girder bridge.
引文
[1]交通部公路科学研究所.西部交通建设科技项目可行性研究报告:在用预应力连续箱梁、连续刚构桥箱梁开裂成因及处治技术研究[R],2002.Highway Science Research Institute of the Ministry of Communications.The feasibility study report of the western traffic construction science and technology project:In the study of cracking cause and treatment technology for prestressed concrete continuous box girder and rigid frame bridges[R],2002.
[2]施嘉.大跨径预应力混凝土连续刚构桥开裂成因分析研究[D].成都:西南交通大学,2013.Shi Jia.Study on the origin of cracking of long-span PC continuous rigid frame bridge[D].Chengdu:Southwest Jiaotong University,2013.
[3]陈妍如,周水兴,陈湛荣.竖向预应力筋对连续刚构桥受力影响分析[J].重庆交通大学学报:自然科学版,2008,27(2):173-176.Chen Y R,Zhou X S,Chen Z R.Mechanic analysis on vertical prestressing bar to continuous rigid framed bridge[J].Journal of Chongqing Jiaotong University:Natural Science Edition,2008,27(2):173-176.
[4]于天来,姜震.连续刚构箱梁桥腹板开裂原因分析[J].中外公路,2013,33(2):132-136.Yu T L,Jiang Z.Analysis of the causes of cracks in the webs of continuous rigid box girder bridge[J].Journal of China&Foreign Highway,2013,33(2):132-136.
[5]王玮玮.PC箱梁竖向预应力损失测试方法及应用技术研究[D].长沙:长沙理工大学,2013.Wang Weiwei.Research on the test methods of vertical prestressing losses and application technology in PC box girder[D].Changsha:Changsha University of Science&Technology,2013.
[6]周新波.箱梁竖向预应力张拉力无损检测研究[J].山东大学学报(工学版),2013,43(6):77-94.Zhou Xinbo.Non-destructive detection research of the box girder vertical prestressed tensile force[J].Journal of Shandong University(Engineering Science),2013,43(6):77-94.
[7]JTG D62-2004公路钢筋混凝土及预应力混凝土桥涵设计规范[S].JTG D62-2004Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts[S].
[8]Deng J L.Negative power AGO in grey theory[J].Journal of Grey System,2001,13(3):1-6.
[9]Zhang Q S.Difference information entropy in grey theory[J].Journal of Grey System,2001,13(2):21-25.
[10]Song Z M,Wang Z D,Tong X J.Grey generating space on opposite accumulation[J].Journal of Grey System,2001,13(4):305-308.
[11]Song Z M,Xiao X P,Deng J L.The character of opposite direction AGO and class ratio[J].Journal of Grey System,2002,14(1):9-14.
[12]Deng J L.The Primary Methods of Grey Theory[M].Wuhan:Huazhong University of Science and Technology Press,2004:26-34.
[13]刘思峰,谢乃明.灰色系统理论及其应用[M].北京:科学出版社,2013.Liu Sifeng,Xie Naiming.Gray System Theory and Its Application[M].Beijing:Science Press,2013.
[14]邓聚龙.灰色控制系统[M].武汉:华中理工大学出版社,1988.Deng J L.Gray Control System[M].Wuhan:Huazhong University of Science and Technology Press,1988.
[15]黄伟群.竖向预应力长期损失的研究及施工与检测方法探索[D].湘潭:湖南科技大学,2009.Huang Weiqun.Research on the long-term loss and the method of construction&detection of vertical Prestress[D].Xiangtan:Hunan University of Science and Technology,2009.
[16]林鸣.预应力混凝土箱梁桥竖向预应力损失的研究[D].长沙:长沙理工大学,2007.Lin Ming.Research on vertical prestress losses in prestressed concrete box girder bridge[D].Changsha:Changsha University of Science&Technology,2007.
[2]施嘉.大跨径预应力混凝土连续刚构桥开裂成因分析研究[D].成都:西南交通大学,2013.Shi Jia.Study on the origin of cracking of long-span PC continuous rigid frame bridge[D].Chengdu:Southwest Jiaotong University,2013.
[3]陈妍如,周水兴,陈湛荣.竖向预应力筋对连续刚构桥受力影响分析[J].重庆交通大学学报:自然科学版,2008,27(2):173-176.Chen Y R,Zhou X S,Chen Z R.Mechanic analysis on vertical prestressing bar to continuous rigid framed bridge[J].Journal of Chongqing Jiaotong University:Natural Science Edition,2008,27(2):173-176.
[4]于天来,姜震.连续刚构箱梁桥腹板开裂原因分析[J].中外公路,2013,33(2):132-136.Yu T L,Jiang Z.Analysis of the causes of cracks in the webs of continuous rigid box girder bridge[J].Journal of China&Foreign Highway,2013,33(2):132-136.
[5]王玮玮.PC箱梁竖向预应力损失测试方法及应用技术研究[D].长沙:长沙理工大学,2013.Wang Weiwei.Research on the test methods of vertical prestressing losses and application technology in PC box girder[D].Changsha:Changsha University of Science&Technology,2013.
[6]周新波.箱梁竖向预应力张拉力无损检测研究[J].山东大学学报(工学版),2013,43(6):77-94.Zhou Xinbo.Non-destructive detection research of the box girder vertical prestressed tensile force[J].Journal of Shandong University(Engineering Science),2013,43(6):77-94.
[7]JTG D62-2004公路钢筋混凝土及预应力混凝土桥涵设计规范[S].JTG D62-2004Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts[S].
[8]Deng J L.Negative power AGO in grey theory[J].Journal of Grey System,2001,13(3):1-6.
[9]Zhang Q S.Difference information entropy in grey theory[J].Journal of Grey System,2001,13(2):21-25.
[10]Song Z M,Wang Z D,Tong X J.Grey generating space on opposite accumulation[J].Journal of Grey System,2001,13(4):305-308.
[11]Song Z M,Xiao X P,Deng J L.The character of opposite direction AGO and class ratio[J].Journal of Grey System,2002,14(1):9-14.
[12]Deng J L.The Primary Methods of Grey Theory[M].Wuhan:Huazhong University of Science and Technology Press,2004:26-34.
[13]刘思峰,谢乃明.灰色系统理论及其应用[M].北京:科学出版社,2013.Liu Sifeng,Xie Naiming.Gray System Theory and Its Application[M].Beijing:Science Press,2013.
[14]邓聚龙.灰色控制系统[M].武汉:华中理工大学出版社,1988.Deng J L.Gray Control System[M].Wuhan:Huazhong University of Science and Technology Press,1988.
[15]黄伟群.竖向预应力长期损失的研究及施工与检测方法探索[D].湘潭:湖南科技大学,2009.Huang Weiqun.Research on the long-term loss and the method of construction&detection of vertical Prestress[D].Xiangtan:Hunan University of Science and Technology,2009.
[16]林鸣.预应力混凝土箱梁桥竖向预应力损失的研究[D].长沙:长沙理工大学,2007.Lin Ming.Research on vertical prestress losses in prestressed concrete box girder bridge[D].Changsha:Changsha University of Science&Technology,2007.