HPFL加固预制空心板的数值模拟与试验研究

Numerical Simulation and Experimental Investigation on Precast Hollow-core Slabs Strengthened with HPFL

对HPFL加固预制混凝土空心板抗弯性能和抗剪性能进行了试验研究,以此为基础利用ANSYS有限元计算软件对HPFL加固预制空心板进行了数值模拟.与试验结果进行比较分析,研究加固构件的抗弯性能和抗剪性能.通过有限元建模进一步研究了HPFL加固层砂浆强度、HPFL加固层钢筋网尺寸、HPFL加固条带宽度和预制空心板板体拼装方向等因素对HPFL加固预制空心板抗剪性能的影响.结果表明,有限元计算结果与试验结果基本一致,用HPFL加固预制空心板是一种提高预制空心板抗弯性能和抗剪性能的有效加固方法.HPFL加固层砂浆强度和HPFL加固条带宽度对预制空心板抗剪性能影响最大,随着HPFL加固层砂浆强度提高和HPFL加固条带宽度增大,预制空心板抗剪极限承载力显著提高;HPFL加固层钢筋网尺寸对预制空心板抗剪性能影响不明显;HPFL能同时提高预制空心板平面内横、竖两个方向的抗剪极限承载力.

Based on the experimental study of the flexural performance and shear performance of precast hollow-core slabs strengthened with HPFL, the ANSYS was applied to build the spatial finite element model to analyze the precast hollow-core slabs strengthened with HPFL. Further analysis was conducted for the HPFL strengthening surface mortar strength, HPFL reinforcement layer steel bar mesh size, HPFL reinforcement stripe width and the direction of precast hollow slabs and other factors on the preeast hollow slabs shear performance strengthened with HPFL. The results demonstrate that finite element analysis results and the experimental results are basically identical and the effectiveness of HPFL as a kind of improved precast hollow slabs flexural resistance and shear resistance. The HPFL stripe width and the strengthening surface mortar strength have the most important influence on the strengthening effects. The ultimate capacity increases with their enlargement. The ultimate capacity increases slightly with the steel bar mesh size. HPFL can also improve the precast hollow slabs＂ shear bearing capacity of horizontal and vertical directions.