预应力钢带加固火灾后钢筋混凝土T型梁抗剪性能研究
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
为研究预应力钢带加固受火后钢筋混凝土T型梁的抗剪性能,共完成了11根火灾后加固混凝土T型梁试件和1根未受火对比梁试件的试验研究,其中火灾试验在火灾试验炉中按ISO 834标准升温曲线进行。通过试验研究,着重考察预应力钢带间距、预应力钢带层数、火灾试验受火时间等关键参数对火灾后加固混凝土梁受剪破坏形态和受剪承载能力的影响规律。试验研究结果表明:不同加固度的火灾后加固试件抗剪承载能力比未受火未加固试件抗剪承载能力提高20%~50%,有效提高了火灾后混凝土梁抗剪承载能力,同时预应力钢带加固还能有效改善试件剪切破坏开裂性能和变形性能,有效提高加固试件的延性性能。
To study the shear performance of prestressed steel strip strengthened after-fire concrete T-shaped beam,eleven after-fire reinforced concrete T-shaped beam specimens retrofitted with prestressed steel strips and one normal temperature control beam were tested,eleven beam specimens included in fire test were heated under ISO 834 curve.It was examined the effects of layer numbers of steel strip,the spacing of steel strip and fire exposure time on the shearing failure mode and shearing capacity. Through analysis of static load test,it was found that the shear capacity retrofitted beam with different strengthening degree could be increased by 20% ~ 50% as compared with normal temperature control beam,this skill could improve the shear capacity of the concrete beam efficiently. It could also improve cracking resistance and deformation properties of the specimens under shear failure,and the ductility of the strengthened beams could be significantly increased.
引文
[1]Fletcher I,Carvel R,Welch S,et al.The Behavior of Concrete Structures in Fire[J].Thermal Science,2007,11(2):33-57.
    [2]Saatcioglu M,Yalcin C.External Prestressing Concrete Columns for Improved Seismic Shear Resistance[J].Journal of Structural Engineering,ASCE,2003,129(8):1057-1070.
    [3]Munawar A H,Robert G D.Experimental Study on the Seismic Performance of Externally Confined Reinforced Concrete Columns[C]//Proc.13th WCEE.Perper No.578.Vancouver BC,Canada:Canadian Association of Earthquake Engineering,2004.
    [4]Yamakawa T,Banazadeh M,Fujikawa S.Emergency Retrofit of Shear Damaged Extremely Short RC Columns Using Pre-Tensioned Aramid Fiber Belts[J].Journal of Advanced Concrete Technology,2005,3(1):95-106.
    [5]杨军民,郭子雄,黄群贤.预应力钢丝绳箍加固钢筋混凝土梁抗剪承载力计算方法[J].华侨大学学报:自然科学版,2011,32(4):422-426.
    [6]刘敏,关建光,徐福泉,等.预应力包钢法加固钢筋混凝土梁抗剪性能的试验研究[J].工程抗震与加固改造,2006,28(5):49-54.
    [7]吴波,刘灿,徐凯燕.横向预应力混凝土梁的抗剪性能试验研究[J].地震工程与工程振动,2007,27(2):58-62.
    [8]曾银枝,徐福泉,霍达,等.角钢和打包带加固低强度砖墙的抗震性能试验研究[J].工程抗震与加固改造,2011,33(6):58-62.
    [9]姚新强.规则平面西藏单层砌体打包带加固抗震试验与有限元模拟分析[D].哈尔滨:中国地震局工程力学研究所,2011.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心