预应力钢绞线应急加固混凝土柱试验研究
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摘要
为了实现对震损桥梁墩柱的加固,快速恢复震后受损桥梁的通行能力,制作了4个混凝土柱,用"夹钳法"设计的锚具进行了加固,对加固构件进行了拟静力试验,分析了钢绞线预应力水平与钢绞线间距对位移、钢筋应力、构件延性的影响,研究结果表明:钢绞线预加应力与拧紧螺母所需扭矩呈线性关系;施加环向预应力钢绞线对震损柱的抗震性能有良好的修复提升作用,增大钢绞线的预应力水平、减少钢绞线间距均可提升试件的抗剪承载力与耗能能力。
In order to strengthen the pier column of damaged bridge and restore the capacity of damaged bridge after earthquake rapidly,four concrete columns are made with anchorage reinforcement.It is designed by clamp method,and the quasi-static test of strengthened members is carried out. In this experiment,the influence of the prestressing level of steel strand on the distance between strand and displacement,and also the influence on the reinforcement stress and member ductility are analyzed results show that there is a linear relationship between the steel strand prestressing and the torque required to tighten the nut; the application of prestressed steel strand with ring has a good effect on improving the seismic performance of the damaged columns. Increasing the prestress level of the steel strand and reducing the distance between the steel strand can improve the shear capacity and energy dissipation capacity of the specimen.
In order to strengthen the pier column of damaged bridge and restore the capacity of damaged bridge after earthquake rapidly,four concrete columns are made with anchorage reinforcement.It is designed by clamp method,and the quasi-static test of strengthened members is carried out. In this experiment,the influence of the prestressing level of steel strand on the distance between strand and displacement,and also the influence on the reinforcement stress and member ductility are analyzed results show that there is a linear relationship between the steel strand prestressing and the torque required to tighten the nut; the application of prestressed steel strand with ring has a good effect on improving the seismic performance of the damaged columns. Increasing the prestress level of the steel strand and reducing the distance between the steel strand can improve the shear capacity and energy dissipation capacity of the specimen.
引文
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[9]易贤仁.钢绞线偏轴应变测量方法及实验研究[J].土木工程与管理学报,2008(3):211-213Yi Xian-Ren. Measurement and experimental study of steel strand partial axis strain[J]. Journal of Civil Engineering and Management,2008(3):211-213(in Chinese)
[10] Park Y J,Ang H S. Mechanistic seismic damage model for reinforced concrete[J]. Journal of Structural Engineering,1985,111(4):722-739
[11]何政,欧进萍.钢筋混凝土结构基于改进能力谱法的地震损伤性能设计[J].地震工程与工程振动,2000,(2):31-38He Zheng,Ou Jin-Ping. Seismic damage performance design of reinforced concrete structures based on improved capacity spectrum method[J]. Earthquake Engineering and Engineering Vibration,2000,(2):31-38(in Chinese)
[2] Watanabe F. Behavior of reinforced concrete buildings during the Hyougoken-Nanbu earthquake[J].Cement&Concrete Composites,1997,19(3):203-211
[3]王东升,郭迅,孙治国,等.汶川大地震公路桥梁震害初步调查[J].地震工程与工程振动,2009,(3):84-94Wang Dong-sheng,Guo Xun,Sun Zhi-guo,et al. Damage to highway bridge during wenchuan earthquake[J].Earthquake Engineering and Engineering Dynamics,2009,(3):84-94(in Chinese)
[4] Saatcioglu M,Yalcin C. External prestressing concrete columns for improved shear resistance[J]. Journal of Structure Engineering,ASCE,2003,129(8):1057-1070
[5] Yamakawa T,Kamogawa S,Kurashige M. Seismic performance and design of RC columns retrofitted by PC bar prestressing as external hoops[J]. Journal of Structural&Construction Engineering,2000,65(537):107-113
[6]郭子雄,曾建宇,黄群贤,等.预应力钢板箍加固RC柱轴压性能试验研究[J].建筑结构学报,2012,33(11):124-131Guo Zi-Xiong,Zeng Jian-Yu,Huang Qun-Xian,et al.Experimental study on axial compression behavior of RC columns retrofitted by prestressed steel jackets[J].Journal of Building Structures,2012,33(11):124-131(in Chinese)
[7]周长东,张艾荣,赵锋.预应力FRP片材加固混凝土墩柱的研究进展[J].结构工程师,2010,26(1):151-155Zhou Chang-Dong,Zhang Ai-Rong,Zhao Feng. Research progress on concrete columns strengthened with lateral prestressed FRP sheets[J]. Structural Engineers,2010,26(1):151-155(in Chinese)
[8]周长东,李季,朱万旭,等.纤维复合材料自锁式锚具设计及力学性能研究[J].建筑结构学报,2013,34(2):141-148Zhou Chang-Dong,Li Ji,Zhu Wan-Xu,et al. Design of self-locking anchor system of FRP and research on mechanical properities[J]. Journal of Building Structures,2013,34(2):141-148(in Chinese)
[9]易贤仁.钢绞线偏轴应变测量方法及实验研究[J].土木工程与管理学报,2008(3):211-213Yi Xian-Ren. Measurement and experimental study of steel strand partial axis strain[J]. Journal of Civil Engineering and Management,2008(3):211-213(in Chinese)
[10] Park Y J,Ang H S. Mechanistic seismic damage model for reinforced concrete[J]. Journal of Structural Engineering,1985,111(4):722-739
[11]何政,欧进萍.钢筋混凝土结构基于改进能力谱法的地震损伤性能设计[J].地震工程与工程振动,2000,(2):31-38He Zheng,Ou Jin-Ping. Seismic damage performance design of reinforced concrete structures based on improved capacity spectrum method[J]. Earthquake Engineering and Engineering Vibration,2000,(2):31-38(in Chinese)