基于钢束应力测试的预应力混凝土箱梁承载力评估方法
|
摘要
为了解决在役开裂损伤预应力混凝土箱梁桥安全性能的量化评估问题,在局部预应力钢束有效预应力测试的基础上,开展开裂损伤预应力混凝土箱梁桥承载力评估方法研究。首先,基于参数识别与修正思想,将预应力瞬时损失中的摩阻损失和反摩阻损失值用摩阻损失相关参数表示,提出一种基于表层钢束应力推定内层钢束应力的方法,解决预应力混凝土桥梁钢束沿程实际应力分布的量化表达问题。其次,考虑截面受拉区混凝土抗拉强度影响,推导考虑受拉区混凝土开裂影响的截面分析迭代公式,提出迭代求解方法和步骤。最后,开展3片实梁足尺模型试验,采用预应力钢索张力测试仪对开裂损伤的试验梁跨中截面表层钢束进行了应力测试,并将提出的方法应用于钢束有效应力预测,得到了跨中截面所有钢束的应力推定值。进行了桥梁极限承载力试验,得到全过程加载下的结构受力与变形实测值及破坏模式,并将理论算法与试验测试结果进行对比分析。研究结果表明:各级荷载下的试验梁应变理论计算值与试验测试值具有较好的一致性,提出的钢束应力预测方法和截面分析方法能准确反映开裂损伤预应力混凝土箱梁的力学特征,可用于开裂损伤的预应力混凝土箱梁桥运营期间承载能力的量化评估。
In order to perform quantitative assessment on the safety performance of PC box-girder bridges with cracks during service period,the evaluation method for the bearing capacity of a damaged PC box-girder bridge was carried out,based on the partial effective stress test of a tendon in PC box-girder bridge.Firstly,based on the principle of parameter identification and the correction method,the variation in transient prestress loss,including frictional loss and antifriction loss,was represented by the friction loss parameters,and a new method was proposed topredict the effective stress on the inner tendon from the outer tendon.Then,an equilibrium iteration algorithm and a procedure for considering the tensile strength of concrete in the cross section were developed.Finally,a full-scale experiment was carried out for three girders.The stress on the outer tendon at the mid-span section of the girder was measured using a special stress detector.Using the proposed method,the stress of the inner tendon at the mid-span section was predicted.The measured load,deformation,and the failure mode of the structure during the entire loading process was obtained.A comparison was made between the theoretical results proposed in this paper and the experimental results.The results show that calculated strain of the test girder is in good agreement with the experimental results,which illustrate that the stress prediction method of the tendon and equilibrium iteration method can accurately reflect the mechanical characteristics of a damaged PC box girder.It can be used to quantitatively evaluate the bearing capacity of box-girder bridges with damage during service period.3 tabs,9 figs,22 refs.
In order to perform quantitative assessment on the safety performance of PC box-girder bridges with cracks during service period,the evaluation method for the bearing capacity of a damaged PC box-girder bridge was carried out,based on the partial effective stress test of a tendon in PC box-girder bridge.Firstly,based on the principle of parameter identification and the correction method,the variation in transient prestress loss,including frictional loss and antifriction loss,was represented by the friction loss parameters,and a new method was proposed topredict the effective stress on the inner tendon from the outer tendon.Then,an equilibrium iteration algorithm and a procedure for considering the tensile strength of concrete in the cross section were developed.Finally,a full-scale experiment was carried out for three girders.The stress on the outer tendon at the mid-span section of the girder was measured using a special stress detector.Using the proposed method,the stress of the inner tendon at the mid-span section was predicted.The measured load,deformation,and the failure mode of the structure during the entire loading process was obtained.A comparison was made between the theoretical results proposed in this paper and the experimental results.The results show that calculated strain of the test girder is in good agreement with the experimental results,which illustrate that the stress prediction method of the tendon and equilibrium iteration method can accurately reflect the mechanical characteristics of a damaged PC box girder.It can be used to quantitatively evaluate the bearing capacity of box-girder bridges with damage during service period.3 tabs,9 figs,22 refs.
引文
[1]吕志涛,潘钻峰.大跨径预应力混凝土箱梁桥设计中的几个问题[J].土木工程学报,2010,43(1):70-76.LU Zhi-tao,PAN Zuan-feng.Issues in design of longspan prestressed concrete box girder bridges[J].China Civil Engineering Journal,2010,43(1):70-76.
[2]俞先林,叶见曙,吴文清.大跨度预应力混凝土箱梁桥开裂病害[J].哈尔滨工业大学学报,2011,43(6):101-104.YU Xian-lin,YE Jian-shu,WU Wen-qing.Cracking damage of long span prestressed concrete box girder bridges[J].Journal of Harbin Institute of Technology,2011,43(6):101-104.
[3]谢峻,王国亮,郑晓华.大跨径预应力混凝土箱梁桥长期下挠问题的研究现状[J].公路交通科技,2007,24(1):47-50.XIE Jun,WANG Guo-liang,ZHENG Xiao-hua.State of art of long-term deflection for long span prestressed concrete box-girder bridge[J].Journal of Highway and Transportation Research and Development,2007,24(1):47-50.
[4]贺拴海,赵祥模,马建,等.公路桥梁检测及评价技术综述[J].中国公路学报,2017,30(11):63-80.HE Shuan-hai,ZHAO Xiang-mo,MA Jian,et al.Review of highway bridge inspection and condition assessment[J].China Journal of Highway and Transport,2017,30(11):63-80.
[5]王彬,徐秀丽,李雪红,等.基于自适应模糊推理和RBF网络的桥梁安全评估[J].中国安全科学学报,2017,27(5):164-168.WANG Bin,XU Xiu-li,LI Xue-hong,et al.Safety assessment of bridge based on RBF neural network and adaptive fuzzy inference[J].China Safety Science Journal,2017,27(5):164-168.
[6]张一鸣,宋庭新,朱清波,等.基于四层评估模型的桥梁损伤安全评估方法[J].湖北工业大学学报,2016,31(5):30-35.ZHANG Yi-ming,SONG Ting-xin,ZHU Qing-bo,et al.Bridge damage safety evaluation based on fourlayer fuzzy comprehensive evaluation model with its application[J].Journal of Hubei University of Technology,2016,31(5):30-35.
[7]卜建清,王海云.PRC简支梁桥有效预应力识别的BP神经网络方法[J].振动与冲击,2011,30(12):154-159.BU Jian-qing,WANG Hai-yun.Effective prestress identification for a simply-supported PRC beam bridge by BP neural network method[J].Journal of Vibration and Shock,2011,30(12):154-159.
[8]HASANCEBI O,DUMLUPINAR T.Detailed load rating analyses of bridge populations using nonlinear finite element models and artificial neural networks[J].Computers&Structures,2013,128:48-63.
[9]赵煜,任伟,李春风,等.预应力混凝土简支箱梁裂缝损伤参数影响分析[J].长安大学学报:自然科学版,2010,30(2):58-63.ZHAO Yu,REN Wei,LI Chun-feng,et al.Parameter influence analysis of existing simply-supported box girder bridge based on crack feature[J].Journal of Chang'an University:Natural Science Edition,2010,30(2):58-63.
[10]赵煜,贺拴海,李春风,等.在役预应力混凝土箱梁开裂后承载力评估[J].同济大学学报:自然科学版,2010,38(9):1271-1275.ZHAO Yu,HE Shuan-hai,LI Chun-feng,et al.Evaluating system of bearing capacity for existing cracked restressed concrete box girder based on crack feature[J].Journal of Tongji University:Natural Science,2010,38(9):1271-1275.
[11]郭琦,贺拴海.大跨度PC桥梁有效预应力衰变行为监测与评估模型研究[J].公路交通科技,2011,28(5):61-67.GUO Qi,HE Shuan-hai.Research on monitoring and evaluating effective prestress decay behavior of longspan PC bridge[J].Journal of Highway and Transportation Research and Development,2011,28(5):61-67.
[12]郭琦,尹海军.缺陷PC梁式桥刚度退化-预应力损失的耦合评估模型[J].中国公路学报,2016,29(1):75-81.GUO Qi,YIN Hai-jun.Coupling evaluation model of stiffness deterioration&prestress losses for deficit PC beam bridges[J].China Journal of Highway and Transport,2016,29(1):75-81.
[13]郭琦.复杂预应力体系梁式结构有效预应力预测理论与方法研究[D].西安:长安大学,2008.GUO Qi.Theory and methodology of predication on effective prestress for beam structures with complicated prestressing systems[D].Xi'an:Chang'an University,2008.
[14]XU J L,SUN Z.Prestress force identification based on forced vibration tests of eccentrically prestressed concrete beam[J].Advanced Materials Research,2012,479:733-738.
[15]KIM B H,KIM S J,YEO K S,et al.Estimating effective prestress force on grouted tendon by impact responses[M].New York:Dynamics of Civil Structures,2011.
[16]CHENG S Y,YAN D J,LI Y Z,et al.Experimental study on PC beams dynamic performance with the itial effective prestress[J].Applied Mechanics and Materials,2013,268:749-752.
[17]PARK J H,KIM J T,HONG D S,et al.Autonomous smart sensor nodes for global and local damage detection of prestressed concrete bridges based on accelerations and impedance measurements[J].Smart Structures and Systems,2010,6(5/6):711-730.
[18]ZHAO Y M,LI H X,WANG X W.Estimation method for prestress loss of externally prestressed composite girder bridges[J].Advanced Materials Research,2014,919:547-550.
[19]周勇军,韩智强,赵煜,等.基于横张法有效预应力测试仪的计算方法[J].合肥工业大学学报:自然科学版,2013,36(2):248-252.ZHOU Yong-jun,HAN Zhi-qiang,ZHAO Yu,et al.Computing method for effective pre-stress tester based on transverse tensioning method[J].Journal of Hefei University of Technology:Natural Science Edition,2013,36(2):248-252.
[20]李世安,贺拴海,娄诚,等.基于横张增量法的PC梁桥现存应力测试与评估[J].长安大学学报:自然科学版,2012,32(2):70-73.LI Shi-an,HE Shuan-hai,LOU Cheng,et al.Detection and assessment on existing stress of PC girder bridge based on horizontal tension-increment method[J].Journal of Chang'an University:Natural Science Edition,2012,32(2):70-73.
[21]黄颖,房贞政.在役预应力混凝土简支梁现存预应力的有限元模拟研究[J].福州大学学报:自然科学版,2013,41(6):1110-1114.HUANG Ying,FANG Zhen-zheng.The finite element simulation analysis of the extant prestressed force of in-service prestress concrete simply-supported beam[J].Journal of Fuzhou University:Natural Science Edition,2013,41(6):1110-1114.
[22]赵煜,周博,贺拴海,等.基于裂缝特征的PC简支梁损伤刚度评估方法[J].长安大学学报:自然科学版,2011,31(4):39-44.ZHAO Yu,ZHOU Bo,HE Shuan-hai,et al.Damage stiffness assessment method based on fracture characteristics of PC simply-supported beam[J].Journal of Chang'an University:Natural Science Edition,2011,31(4):39-44.
[2]俞先林,叶见曙,吴文清.大跨度预应力混凝土箱梁桥开裂病害[J].哈尔滨工业大学学报,2011,43(6):101-104.YU Xian-lin,YE Jian-shu,WU Wen-qing.Cracking damage of long span prestressed concrete box girder bridges[J].Journal of Harbin Institute of Technology,2011,43(6):101-104.
[3]谢峻,王国亮,郑晓华.大跨径预应力混凝土箱梁桥长期下挠问题的研究现状[J].公路交通科技,2007,24(1):47-50.XIE Jun,WANG Guo-liang,ZHENG Xiao-hua.State of art of long-term deflection for long span prestressed concrete box-girder bridge[J].Journal of Highway and Transportation Research and Development,2007,24(1):47-50.
[4]贺拴海,赵祥模,马建,等.公路桥梁检测及评价技术综述[J].中国公路学报,2017,30(11):63-80.HE Shuan-hai,ZHAO Xiang-mo,MA Jian,et al.Review of highway bridge inspection and condition assessment[J].China Journal of Highway and Transport,2017,30(11):63-80.
[5]王彬,徐秀丽,李雪红,等.基于自适应模糊推理和RBF网络的桥梁安全评估[J].中国安全科学学报,2017,27(5):164-168.WANG Bin,XU Xiu-li,LI Xue-hong,et al.Safety assessment of bridge based on RBF neural network and adaptive fuzzy inference[J].China Safety Science Journal,2017,27(5):164-168.
[6]张一鸣,宋庭新,朱清波,等.基于四层评估模型的桥梁损伤安全评估方法[J].湖北工业大学学报,2016,31(5):30-35.ZHANG Yi-ming,SONG Ting-xin,ZHU Qing-bo,et al.Bridge damage safety evaluation based on fourlayer fuzzy comprehensive evaluation model with its application[J].Journal of Hubei University of Technology,2016,31(5):30-35.
[7]卜建清,王海云.PRC简支梁桥有效预应力识别的BP神经网络方法[J].振动与冲击,2011,30(12):154-159.BU Jian-qing,WANG Hai-yun.Effective prestress identification for a simply-supported PRC beam bridge by BP neural network method[J].Journal of Vibration and Shock,2011,30(12):154-159.
[8]HASANCEBI O,DUMLUPINAR T.Detailed load rating analyses of bridge populations using nonlinear finite element models and artificial neural networks[J].Computers&Structures,2013,128:48-63.
[9]赵煜,任伟,李春风,等.预应力混凝土简支箱梁裂缝损伤参数影响分析[J].长安大学学报:自然科学版,2010,30(2):58-63.ZHAO Yu,REN Wei,LI Chun-feng,et al.Parameter influence analysis of existing simply-supported box girder bridge based on crack feature[J].Journal of Chang'an University:Natural Science Edition,2010,30(2):58-63.
[10]赵煜,贺拴海,李春风,等.在役预应力混凝土箱梁开裂后承载力评估[J].同济大学学报:自然科学版,2010,38(9):1271-1275.ZHAO Yu,HE Shuan-hai,LI Chun-feng,et al.Evaluating system of bearing capacity for existing cracked restressed concrete box girder based on crack feature[J].Journal of Tongji University:Natural Science,2010,38(9):1271-1275.
[11]郭琦,贺拴海.大跨度PC桥梁有效预应力衰变行为监测与评估模型研究[J].公路交通科技,2011,28(5):61-67.GUO Qi,HE Shuan-hai.Research on monitoring and evaluating effective prestress decay behavior of longspan PC bridge[J].Journal of Highway and Transportation Research and Development,2011,28(5):61-67.
[12]郭琦,尹海军.缺陷PC梁式桥刚度退化-预应力损失的耦合评估模型[J].中国公路学报,2016,29(1):75-81.GUO Qi,YIN Hai-jun.Coupling evaluation model of stiffness deterioration&prestress losses for deficit PC beam bridges[J].China Journal of Highway and Transport,2016,29(1):75-81.
[13]郭琦.复杂预应力体系梁式结构有效预应力预测理论与方法研究[D].西安:长安大学,2008.GUO Qi.Theory and methodology of predication on effective prestress for beam structures with complicated prestressing systems[D].Xi'an:Chang'an University,2008.
[14]XU J L,SUN Z.Prestress force identification based on forced vibration tests of eccentrically prestressed concrete beam[J].Advanced Materials Research,2012,479:733-738.
[15]KIM B H,KIM S J,YEO K S,et al.Estimating effective prestress force on grouted tendon by impact responses[M].New York:Dynamics of Civil Structures,2011.
[16]CHENG S Y,YAN D J,LI Y Z,et al.Experimental study on PC beams dynamic performance with the itial effective prestress[J].Applied Mechanics and Materials,2013,268:749-752.
[17]PARK J H,KIM J T,HONG D S,et al.Autonomous smart sensor nodes for global and local damage detection of prestressed concrete bridges based on accelerations and impedance measurements[J].Smart Structures and Systems,2010,6(5/6):711-730.
[18]ZHAO Y M,LI H X,WANG X W.Estimation method for prestress loss of externally prestressed composite girder bridges[J].Advanced Materials Research,2014,919:547-550.
[19]周勇军,韩智强,赵煜,等.基于横张法有效预应力测试仪的计算方法[J].合肥工业大学学报:自然科学版,2013,36(2):248-252.ZHOU Yong-jun,HAN Zhi-qiang,ZHAO Yu,et al.Computing method for effective pre-stress tester based on transverse tensioning method[J].Journal of Hefei University of Technology:Natural Science Edition,2013,36(2):248-252.
[20]李世安,贺拴海,娄诚,等.基于横张增量法的PC梁桥现存应力测试与评估[J].长安大学学报:自然科学版,2012,32(2):70-73.LI Shi-an,HE Shuan-hai,LOU Cheng,et al.Detection and assessment on existing stress of PC girder bridge based on horizontal tension-increment method[J].Journal of Chang'an University:Natural Science Edition,2012,32(2):70-73.
[21]黄颖,房贞政.在役预应力混凝土简支梁现存预应力的有限元模拟研究[J].福州大学学报:自然科学版,2013,41(6):1110-1114.HUANG Ying,FANG Zhen-zheng.The finite element simulation analysis of the extant prestressed force of in-service prestress concrete simply-supported beam[J].Journal of Fuzhou University:Natural Science Edition,2013,41(6):1110-1114.
[22]赵煜,周博,贺拴海,等.基于裂缝特征的PC简支梁损伤刚度评估方法[J].长安大学学报:自然科学版,2011,31(4):39-44.ZHAO Yu,ZHOU Bo,HE Shuan-hai,et al.Damage stiffness assessment method based on fracture characteristics of PC simply-supported beam[J].Journal of Chang'an University:Natural Science Edition,2011,31(4):39-44.