FRP约束混凝土轴心受压短柱承载力计算分析

本文通过采用混凝土三轴应力Ottosen破坏准则及本构关系对FRP约束混凝土柱受压过程进行计算及分析,发现当组合构件应力超过混凝土抗压强度不多时核心混凝土已达到破坏条件.但由于FRP的约束作用整体承载力仍可有很大提高,此时混凝土主动承载力对组合承载力的贡献应小于fc,故引入混凝土抗压强度折减系数k1,并根据大量试验数据对k1进行了回归分析.

ANALYSIS AND CALCULATION OF LOAD-BEARING CAPACITY OFFRP CONFINED CONCRETE COLUMNS UNDER AXIAL COMPRESSION

The process of FRP confined concrete columns is calculated and analyzed by Ottosen failure criterion and stress strain relationship of concrete in the triaxial state. It is found that the concrete reaches its filed condition not long after the concrete bearing capacity are little passed. But with the confinement of FRP sheet, the stress of the composite member can still increase. Accordingly the contribution of concrete stress is less than f c for the whole member. A decreasing coefficient k 1 is introduced. And a great deal of test data is analyzed to consider the effect.