- 付 莹1，孔祥清2，于 洋2，高红军3
引用本文摘 要：通过抗弯性能试验，分析了玄武岩纤维增强筋（BFRP筋）/钢筋混合配筋混凝土梁的承载力、破坏形态、挠度及裂缝发展情况。在试验基础上利用ANSYS软件建立了BFRP筋/钢筋混合配筋混凝土梁的三维有限元数值分析模型，并与试验结果进行了对比。在数值分析模型基础上研究了FRP筋类型及其布置方式对混合配筋混凝土梁抗弯性能的影响。结果表明：BFRP筋/钢筋混合配筋混凝土梁的破坏形式均为钢筋屈服后受压区混凝土被压碎；配筋面积比Af /As越大，初裂荷载越小，裂缝总数越少，挠度逐渐增加；建立的数值分析模型能较准确地模拟BFRP筋/钢筋混合配筋混凝土梁的抗弯性能；BFRP筋、AFRP筋（芳纶纤维增强筋）及GFRP筋（玻璃纤维增强筋）与钢筋混合配筋混凝土梁的荷载-挠度曲线比较接近；与BFRP筋相比，CFRP筋（碳纤维增强筋）/钢筋混合配筋混凝土梁的开裂荷载和极限荷载分别高14.2%和9.3%，最大挠度小35%左右；BFRP筋的布置方式（单层或双层）对混合配筋混凝土梁抗弯性能的影响不大。 Abstract: Through flexural test, the flexural capacity, failure mode, flexibility deformation and crack distribution of basalt fiber reinforced bars (BFRP bars) and steel hybrid reinforced concrete beams were analyzed. Based on the test datas, a 3D finite element model of BFRP bars/steel hybrid reinforced concrete beams was established by using ANSYS software, and compared with the experimental results. Based on the numerical analysis model, the influence of FRP bar types and their arrangement on flexural performance of hybrid reinforced concrete beams was studied. The results show that the failure mode of BFRP bars/steel hybrid reinforced concrete beams is that the concrete in the compression zone is crushed after the steel bars yield. The larger the Af /As, the smaller the initial crack load, the smaller the total number of cracks, and the deflection is increased gradually. The established numerical analysis model can more accurately simulate the flexural performance of BFRP bars/steel hybrid reinforced concrete beams. The load-deflection curves of BFRP bars, AFRP bars, and GFRP bars and steel hybrid reinforced concrete beams are close. Compared with BFRP bars, the cracking load and ultimate load of CFRP bars/rebar hybrid reinforced concrete beams are 14.2% and 9.3% higher, respectively, and the maximum deflection is about 35% smaller. The arrangement of BFRP bars (single layer or double layer) has little effect on the flexural performance of hybrid reinforced concrete beams.
付莹,孔祥清,于洋,等.BFRP筋/钢筋混合配筋混凝土梁抗弯试验与有限元分析[J].混凝土与水泥制品,2020(10):45-50. FU Y,KONG X Q,YU Y,et al.Flexural Test and Finite Element Analysis of BFRP Bars/steel Hybrid Reinforced Concrete Beams[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(10):45-50.