玻璃纤维加固混凝土柱屈服应力应变及位移分析

Calculation of Yielding Stresses,Strains and Displacements of GRP-confined Concrete Cylinders

本文先通过理论推导,提出了有角度玻璃纤维加固纯混凝土柱的屈服应力应变和屈服时柱轴向、径向位移的计算公式。然后采用有限元分析软件ABAQUS对受荷全过程进行数值模拟,旨在分析纤维的存在对混凝土柱的承载力及三向应力应变(环向、径向、受压方向)的加固机理及效果,证明玻璃纤维布有助于混凝土受压柱承载能力和屈服应力应变的提高。最后为证明公式实用性及有限元方法的可行性,取典型的两种不同纤维粘贴角度及无纤维加固的柱模型作受压试验。通过公式计算、数值分析与试验数据三者结果比较,得出玻璃纤维的缠绕角度对混凝土柱承载能力和屈服应力应变的提高程度有较大的影响。

Through the study,the calculation formulas of the displacements of confined concrete column,yielding stresses,yielding strains are proposed.ABAQUS software is used to do the numerical simulation.The purpose of the modeling is to investigate the mechanism and behavior of columns confined with GRP.Two glass fiber reinforced polymers （GRP） confined concrete cylinders with different fiber orientation and one unconfined concrete cylinder are set up.In order to verify practicability of formula and feasibility of the finite element method,same models are tested in the experiment.According to theoretical,numerical and experimental results,the effect of fiber orientation which influence on the improvement of load carrying capacity,yielding stresses and strains of columns is obtained.