复合加固矩形木柱受压应力应变模型

Compressive Stress Strain Model of Combined Strengthening Rectangular Timber Columns

摘要:

为了研究钢筋加固量、碳纤维布包裹方式等对内嵌钢筋外包碳纤维布复合加固矩形木柱受压应力应变关系的影响，基于27根方木柱和9根矩形木柱的轴心受压试验结果，提出了碳纤维布约束矩形木柱的强度计算方法，推导了复合加固矩形木柱的承载力计算公式，并在此基础上提出了复合加固矩形木柱受压三折线应力应变本构关系模型.基于这种模型计算得到的木柱受压应力应变曲线与试验值吻合较好，从而验证了内嵌钢筋外包碳纤维布复合加固矩形木柱受压三折线应力应变模型的适用性.

Abstract:

In order to study the effect of the amount of steel bars and the wrapping method of carbon fiber reinforced plastic(CFRP) sheets on compressive stress strain relationship of rectangular timber columns, based on the test results of 27square and 9 rectangular timber columns under axial compression, the strength calculation method of rectangular timber columns confined by CFRP sheets was proposed, calculation formulas of the bearing capacity for combined strengthening rectangular timber columns were obtaind. Then a trilinear compressive stress strain model of rectangular timber columns strengthened with combination of near surface mounted steel bars and lateral CFRP sheets was recommended. The calculated stress strain curves based on this recommended model are in good agreement with the test values of timber columns, which verifies the applicability of the trilinear compressive stress strain model of rectangular timber columns strengthened with combination of near surface mounted steel bars and lateral CFRP sheets.