碳纤维增强塑料在п梁中的时变特性分析
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摘要
以混凝土п梁为研究对象,根据加固梁结构的位移组成特征,建立了梁上端荷载作用下的非线性蠕变模型,通过添加的M-C塑性元件来反映蠕变模型的非线性加速变化特征,通过理论推导进一步获得了蠕变加速破坏时间的解析式,并重点分析了在竖向荷载作用下,梁上端加载支点的竖向位移、梁跨中挠度、梁下端优势裂纹延伸位移时效变化特征及其数值比较,并得到优势裂纹在蠕变过程中最先破坏而加载支点位置蠕变位移最小的结论。
Taking the concrete beam as the research object,according to the displacement composition of the reinforced beam structure,the non-linear creep model under the load of the upper end of the beam is established,and the nonlinear acceleration change characteristics of the creep model are reflected by the added M-C plastic element.The analysis of creep acceleration failure time is further obtained through theoretical derivation,and the analysis of vertical load is emphasized.The vertical displacement,mid-deflection of the girder span,the extended displacement of the dominant crack at the underside of the girder and its numerical comparison are obtained.The conclusion is that the creep displacement of the dominant crack in the creep process first destroys and the loading of the fulcrum position is minimal.
Taking the concrete beam as the research object,according to the displacement composition of the reinforced beam structure,the non-linear creep model under the load of the upper end of the beam is established,and the nonlinear acceleration change characteristics of the creep model are reflected by the added M-C plastic element.The analysis of creep acceleration failure time is further obtained through theoretical derivation,and the analysis of vertical load is emphasized.The vertical displacement,mid-deflection of the girder span,the extended displacement of the dominant crack at the underside of the girder and its numerical comparison are obtained.The conclusion is that the creep displacement of the dominant crack in the creep process first destroys and the loading of the fulcrum position is minimal.
引文
[1]邓宗才,李建辉.混杂纤维布加固钢筋混凝土梁抗弯性能实验及理论研究[J].工程力学,2009,26(2):115-124.
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[3]刘翔,伍文.纤维增强塑料筋在土木工程中的应用[J].塑料工业,2018,46(2):50-53.
[4]王芝银,李云鹏.岩体流变理论及其数值模拟[M].北京:科学出版社,2008.
[5]王军,曹平,李江腾,等.降雨入渗对流变介质隧道边坡稳定性的分析[J].岩土力学,2009,30(7):2 158-2 162.
[6]任振华,曾宪桃,熊山铭,等.外贴CFRP板加固混凝土梁桥界面特性研究的宽缺口梁法[J].中国公路学报,2015,28(1):71-79.
[2]陈茜,杜向琴,娄宗科,等.碳纤维混凝土断裂能研究[J].人民长江,2008,39(16):79-81.
[3]刘翔,伍文.纤维增强塑料筋在土木工程中的应用[J].塑料工业,2018,46(2):50-53.
[4]王芝银,李云鹏.岩体流变理论及其数值模拟[M].北京:科学出版社,2008.
[5]王军,曹平,李江腾,等.降雨入渗对流变介质隧道边坡稳定性的分析[J].岩土力学,2009,30(7):2 158-2 162.
[6]任振华,曾宪桃,熊山铭,等.外贴CFRP板加固混凝土梁桥界面特性研究的宽缺口梁法[J].中国公路学报,2015,28(1):71-79.