高速磁浮倒T形梁模型试验与有限元分析

为降低传统钢筋混凝土结构中钢筋网骨架在磁场作用下对磁浮列车产生的影响,减小能耗,试验采用玻璃纤维、不锈钢纤维、玄武岩纤维、玄武岩纤维+土工格栅、玻璃纤维+土工格栅五种非金属加强筋作为骨架,浇筑加强筋混凝土倒T形梁模型,通过横向抗弯静载试验分析不同材料加强筋骨架对混凝土结构力学性能的影响;采用有限元方法建立倒T形梁混凝土损伤塑性模型研究其损伤特性,并与试验结果对比验证。结果表明:在最不利位置施加30 kN试验设计荷载,五种倒T形梁均无结构损伤、开裂等现象产生,满足设计标准;五种倒T形梁开裂荷载接近,超过设计荷载的2.8倍;考虑加强筋力学性能、工程造价等多种因素,玻璃纤维加强筋骨架较优。

Model Test and Finite Element Analysis of High Speed Maglev Inverted T-girder

In order to reduce the influence of the reinforcement mesh skeleton in the traditional reinforced concrete structure on the maglev train under the action of magnetic field and reduce energy consumption,five kinds of nonmetallic stiffeners such as glass fiber,stainless steel fiber,basalt fiber,basalt fiber+geogrid and glass fiber+geogrid were used as the skeleton,and the reinforced concrete inverted T-girder model was poured.Through the transverse bending static load test,the influence of stiffener skeleton of different materials on the mechanical properties of concrete structure was analyzed.The damage plastic model of inverted T-girder concrete was established by finite element method,and its damage characteristics were studied and compared with the experimental results.The results show that when 30 k N experimental design load is applied at the most unfavorable position,the five inverted T-girders have no structural damage and cracking,which meet the design standard.The cracking load of inverted T-girders of five materials is close to 2.8 times that of the design load.Considering the mechanical properties of stiffeners and project cost and other factors,glass fiber reinforcement is better as skeleton.