现浇框架结构柱端CFRP加固强柱弱梁效果分析

为研究柱端碳纤维增强复合材料(CFRP)加固对框架结构强柱弱梁效果的影响,利用有限元软件ANSYS对一栋三层现浇钢筋混凝土框架结构做了拟静力数值分析,考虑了现浇楼板对梁抗弯承载力的影响,对框架结构普通梁板柱节点和柱端用碳纤维加固节点的计算结果进行了对比。分析结果表明,梁肋附近楼板钢筋应力随梁端弯矩加大而明显增加,现浇楼板内钢筋对梁抗弯承载力提高的影响不容忽视。在节点处采用外包碳纤维布加固,可以提高框架柱的抗弯能力及延性,使塑性铰首先出现在梁端,使钢筋混凝土框架结构在地震作用下,破坏时更接近"强柱弱梁"的特点。

Research on the efficiency of strong column and weak beam design for reinforced concrete frame retrofitted with hybridized CFRP

In order to study the strong column and weak beam effect of the column ends reinforced with carbon fiber reinforced polymer(CFRP),a numerical quasi-static model was established with ANSYS software for a three-storey reinforced concrete frame structure.The results for traditional joints specified in the design code and for the joints retrofitted with CFRP were compared.It was found that the stress in the reinforce bars for slab close to the beam increases significantly with the applied top displacement of the structure in horizontal direction,but increases slightly for slab far from the beam.For the joints retrofitted with CFRP,the yielding of column reinforce bars will be delayed,while the number of cracks on beams increases,which tend to exhibit a failure type closer to the beam-pivot or ductile mode.