预应力夹片锚钢筋回缩量概率分布模型
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摘要
钢筋回缩量超标是后张法预应力钢筋混凝土梁预应力损失的重要原因。提出钢筋回缩量的简化和准确方法,对233组测试数据进行了概率分布统计,提出了3种钢筋回缩量概率模型分布假设,使用柯尔莫哥洛夫检验法分别对各种分布假设进行检验。研究表明:夹片回缩量小于钢绞线回缩量,夹片和钢绞线发生相对位移,通过夹片回缩量来简易计算钢筋回缩量会导致测试结果偏小;实际工程中存在钢筋回缩量超标的情况,限位板槽深过大是钢筋回缩量超标的重要原因;钢筋回缩量服从正态分布,据此提出的钢筋回缩量正态分布概率模型为实际工程钢筋回缩量以及其导致的预应力损失评估提供了有利依据。钢筋回缩量简化方法和准确方法关联模型可用于实际工程钢筋回缩量的定量评估。
Excessive rebar retraction is an important reason for the loss of prestressing force in post-tensioned reinforced concrete beams.The simplified method and accurate method of rebar retraction were put forward. The probability distribution statistics of 233 groups of test data were carried out,and the distribution hypotheses of probability model of 3 kinds of rebar retraction were put forward. The various distribution hypotheses were tested by Kolmogorov test method respectively. The results show that the retraction of clip is less than that of strand,and the relative displacement of clip and strand occurs.Simply calculating the retraction of steel bar through the retraction of clip will result in smaller test results.In practical engineering,the rebar retraction exceeds the standard,and the excessive depth of groove of limit plate is an important reason for the excessive rebar retraction. The rebar retraction obeys normal distribution. Based on this,the proposed normal distribution probability model of rebar retraction provides a favorable basis for the evaluation of actual rebar retraction and prestress loss caused by rebar retraction. The associated model of the simplified method and accurate method of rebar retraction can be used for quantitative assessment of rebar retraction amount in practical engineering.
Excessive rebar retraction is an important reason for the loss of prestressing force in post-tensioned reinforced concrete beams.The simplified method and accurate method of rebar retraction were put forward. The probability distribution statistics of 233 groups of test data were carried out,and the distribution hypotheses of probability model of 3 kinds of rebar retraction were put forward. The various distribution hypotheses were tested by Kolmogorov test method respectively. The results show that the retraction of clip is less than that of strand,and the relative displacement of clip and strand occurs.Simply calculating the retraction of steel bar through the retraction of clip will result in smaller test results.In practical engineering,the rebar retraction exceeds the standard,and the excessive depth of groove of limit plate is an important reason for the excessive rebar retraction. The rebar retraction obeys normal distribution. Based on this,the proposed normal distribution probability model of rebar retraction provides a favorable basis for the evaluation of actual rebar retraction and prestress loss caused by rebar retraction. The associated model of the simplified method and accurate method of rebar retraction can be used for quantitative assessment of rebar retraction amount in practical engineering.
引文
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[6]闫燕红,邓鸣,何立忠,等.先张预应力混凝土板梁梁端横裂病害原因分析及处治对策研究[J].重庆交通大学学报(自然科学版),2018,37(2):15-23.YAN Yanhong,DENG Ming,HE Lizhong,et al.Diseases cause and Countermeasures of beam transverse crack of pre-tensioning prestressed concrete slab beam[J].Journal of Chongqing Jiaotong University(Natural Science),2018,37(2):15-23.
[7]BARR P J,KUKAY B M,HALLING M W.Comparison of prestress losses for a prestress concrete bridge made with high-performance concrete[J].Journal of Bridge Engineering,2008,13(5):468-475.
[8]NATIO C,SAUSE R,THOMPSON B.Investigation of damaged 12year old prestressed concrete box beams[J].Journal of Bridge Engineering,2008,13(2):139-148.
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[10]BURGOYNE C,SCANTLEBURY R.“Why did Palau bridge collapse?”[J].Journal of Structural Engineering,2006,84(11):30-37.
[11]彭凯,于丛丛.非均匀预应力筋束非线性松弛损失研究[J].重庆交通大学学报(自然科学版),2014,33(3):1-5.PENG Kai,YU Congcong.Non-linear relaxation loss of nonuniform prestressing steel bundles[J].Journal of Chongqing Jiaotong University(Natural Science),2014,33(3):1-5.
[12]秦延召,杨肖肖,张士彩.锚具变形、钢筋回缩和接缝压缩引起的预应力损失数值模拟与试验研究[J].国防交通工程与技术,2014,12(3):32-36.QIN Yanzhao,YANG Xiaoxiao,ZHANG Shicai.Numerical simulation and test study of the stress loss resulting from the deformation of the anchoring device,the contraction of reinforcing steel bars and the compressure of the juncture[J].Traffic Engineering&Technology for National Defense,2014,12(3):32-36.
[13]丁兆峰,马红绛.预应力混凝土连续钢绞线张拉力施工控制计算分析[J].城市道桥与防洪,2016(8):192-194.DING Zhaofeng,MA Hongjiang.Analysis and calculation of construction control for tension of prestressed concrete continuous steel strand[J].Urban Roads Bridges&Flood Control,2016(8):192-194.
[14]王景华.预应力钢绞线张拉伸长值量测方法的探讨[J].铁道工程学报,2008,25(5):46-48.WANG Jinghua.Discussion on the measurement method of tensile value of prestressed steel strand[J].Journal of Railway Engineering Society,2008,25(5):46-48.
[15]梁晓东.钢绞线回缩值的测定方法及应用研究[J].城市道桥与防洪,2015(1):142-144.LIANG Xiaodong.Study on the determination method and application of steel strand retraction value[J].Urban Roads Bridges&Flood Control,2015(1):142-144.
[16]张运涛,孟少平.基于响应面法的大跨连续刚构桥长期变形预测[J].土木工程学报,2011,44(8):102-106.[16]ZHANG Yuntao,MENG Shaoping.Prediction of long-term deformation of long-span continuous rigid-frame bridges using the response surface method[J].China Civil Engineering Journal,2011,44(8):102-106.
[17]GUO Tong,CHEN Zheheng.Deflection control of long-span PSC boxgirder bridge based on field monitoring and probabilistic FEA[J].Journal of Performance of Construction Facility,2016,30(6):1-10.
[18]YANG In-Hwan.Uncertainty and sensitivity analysis of time-dependent effects in concrete structures[J].Engineering Structures,2007,29:1366-1374.
[19]盛骤,谢式千,潘承毅.概率论与数理统计[M].4版.北京:高等教育出版社,2008.SHENG Zhou,XIE Shiqian,PAN Chengyi.Probability Theory and Mathematical Statistics[M].4th ed.Beijing:Higher Education Press,2008.
[2]邹惠琼.大跨预应力混凝土连续刚构桥施工期开裂控制研究[D].长沙:湖南大学,2016.ZOU Huiqiong.Study on Crack Control of Long-Span a Prestressed Concrete Continuous Rigid Frame Bridge During Construction Period[D].Changsha:Hunan University,2016.
[3]郑中华.后张法预应力张拉控制难点应对措施[J].公路交通科技(应用技术版),2014(4):281-283.ZHENG Zhonghua.Counter measures of control difficulties of post tensioning method[J].Journal of Highway and Transportation Research and Development(Applied Technology Edition),2014(4):281-283.
[4]梁勇旗,张文胜,门小雄,等.钢绞线预应力张拉中有关问题探讨[J].公路交通科技(应用技术版),2006(6):127-129.LIANG Yongqi,ZHANG Wensheng,MEN Xiaoxiong,et al.Discussion on the problems of prestressed tension of steel strand[J].Journal of Highway and Transportation Research and Development(Applied Technology Edition),2006(6):127-129.
[5]仇帅,郝永亮.浅谈回缩量对预应力施工的影响[C]//河南省土木建筑学会2010年学术大会论文集.郑州:[出版者不详],2010:392-393.QIU Shuai,HAO Yongliang.Influence of shrinkage of prestressed[C]//Construction Proceedings of the 2010 Academic Conference of Henan Society of Civil Engineering and Architecture.Zhengzhou:[s.n.],2010:392-393.
[6]闫燕红,邓鸣,何立忠,等.先张预应力混凝土板梁梁端横裂病害原因分析及处治对策研究[J].重庆交通大学学报(自然科学版),2018,37(2):15-23.YAN Yanhong,DENG Ming,HE Lizhong,et al.Diseases cause and Countermeasures of beam transverse crack of pre-tensioning prestressed concrete slab beam[J].Journal of Chongqing Jiaotong University(Natural Science),2018,37(2):15-23.
[7]BARR P J,KUKAY B M,HALLING M W.Comparison of prestress losses for a prestress concrete bridge made with high-performance concrete[J].Journal of Bridge Engineering,2008,13(5):468-475.
[8]NATIO C,SAUSE R,THOMPSON B.Investigation of damaged 12year old prestressed concrete box beams[J].Journal of Bridge Engineering,2008,13(2):139-148.
[9]NATIO C J,SAUSE R,HODGSON I,et al.Forensic Evaluation of Prestressed Box Beams from the Lake View Drive Over I-70 Bridge[R].Bethlehem,PA,U.S.A.:Advanced Technology for Large Structural Systems,2006.
[10]BURGOYNE C,SCANTLEBURY R.“Why did Palau bridge collapse?”[J].Journal of Structural Engineering,2006,84(11):30-37.
[11]彭凯,于丛丛.非均匀预应力筋束非线性松弛损失研究[J].重庆交通大学学报(自然科学版),2014,33(3):1-5.PENG Kai,YU Congcong.Non-linear relaxation loss of nonuniform prestressing steel bundles[J].Journal of Chongqing Jiaotong University(Natural Science),2014,33(3):1-5.
[12]秦延召,杨肖肖,张士彩.锚具变形、钢筋回缩和接缝压缩引起的预应力损失数值模拟与试验研究[J].国防交通工程与技术,2014,12(3):32-36.QIN Yanzhao,YANG Xiaoxiao,ZHANG Shicai.Numerical simulation and test study of the stress loss resulting from the deformation of the anchoring device,the contraction of reinforcing steel bars and the compressure of the juncture[J].Traffic Engineering&Technology for National Defense,2014,12(3):32-36.
[13]丁兆峰,马红绛.预应力混凝土连续钢绞线张拉力施工控制计算分析[J].城市道桥与防洪,2016(8):192-194.DING Zhaofeng,MA Hongjiang.Analysis and calculation of construction control for tension of prestressed concrete continuous steel strand[J].Urban Roads Bridges&Flood Control,2016(8):192-194.
[14]王景华.预应力钢绞线张拉伸长值量测方法的探讨[J].铁道工程学报,2008,25(5):46-48.WANG Jinghua.Discussion on the measurement method of tensile value of prestressed steel strand[J].Journal of Railway Engineering Society,2008,25(5):46-48.
[15]梁晓东.钢绞线回缩值的测定方法及应用研究[J].城市道桥与防洪,2015(1):142-144.LIANG Xiaodong.Study on the determination method and application of steel strand retraction value[J].Urban Roads Bridges&Flood Control,2015(1):142-144.
[16]张运涛,孟少平.基于响应面法的大跨连续刚构桥长期变形预测[J].土木工程学报,2011,44(8):102-106.[16]ZHANG Yuntao,MENG Shaoping.Prediction of long-term deformation of long-span continuous rigid-frame bridges using the response surface method[J].China Civil Engineering Journal,2011,44(8):102-106.
[17]GUO Tong,CHEN Zheheng.Deflection control of long-span PSC boxgirder bridge based on field monitoring and probabilistic FEA[J].Journal of Performance of Construction Facility,2016,30(6):1-10.
[18]YANG In-Hwan.Uncertainty and sensitivity analysis of time-dependent effects in concrete structures[J].Engineering Structures,2007,29:1366-1374.
[19]盛骤,谢式千,潘承毅.概率论与数理统计[M].4版.北京:高等教育出版社,2008.SHENG Zhou,XIE Shiqian,PAN Chengyi.Probability Theory and Mathematical Statistics[M].4th ed.Beijing:Higher Education Press,2008.