粘钢加固H形截面压弯钢柱受力性能试验研究

为研究粘贴钢板厚度和荷载偏心距对粘钢加固后的压弯钢柱受力性能的影响,对4个加固后的压弯钢柱以及1个作对比的未加固压弯钢柱进行静力试验,采用Q235B热轧中翼缘H形截面。加固方式为型钢翼缘外侧对称粘贴钢板并全长加固。柱两端采用圆柱铰以实现试件平面内偏心受压。分析了各试件柱中的位移变化、腹板的应变分布、翼缘与钢板之间应变关系、破坏模式以及极限承载力,并将承载力的试验分析值与理论计算值进行对比。结果表明:翼缘外粘钢板加固压弯柱能有效提高其平面外稳定承载力;加固后的压弯钢柱腹板截面塑性发展更明显;偏心距是影响加固后压弯钢柱稳定承载力的主要因素,较小的偏心距有利于钢板与型钢之间通过胶层黏结形成整体共同工作。

Experimental Study on Load-carrying Behavior of H Section Steel Beam-columns Strengthened by Steel Plates

In order to study the influence of the thickness of the steel plate and the eccentricity on load-carrying behavior of the steel beam-column after strengthening by the steel plates, the static test of four strengthened steel beam-column and one comparative unreinforced steel beam-column was conducted. The Q235B hot-rolled middle flange H section is used. The reinforcement method is that the flange was symmetrically bonded to the outside of the flange and was fully reinforced. Cylindrical hinges were used at both ends of the column to achieve eccentric compression in the plane of the steel column. The displacement variation, the strain distribution of the web, the strain change between the steel flange and the steel plate, as well as the buckling mode and the ultimate bearing capacity were discussed. In addition, the test results were compared with the theoretical calculation results. The experimental results show that the reinforcement method of sticking steel plates on the flange can effectively improve the out-plane stability bearing capacity of the steel beam-column. The plasticity of the the web section of the steel beam-column after reinforcement is more obvious. the eccentricity is the main factor affecting the stability bearing capacity of the steel beam-column after reinforcement. Besides, the smaller eccentricity is beneficial to the joint work between the steel plate and the section steel through the bond layer.