框架梁负弯矩区粘钢加固锚固方法试验研究

Experimental Study of Anchoring Methods on Negative Moment Area of RC Beam Strengthened by Gluing Steel Plates

为研究L型钢板在转角处不同锚固措施以及柱上箍板下边缘距梁顶不同距离时对梁端负弯矩区的加固效果,设计制作了三榀H型框架梁,对2个梁端配筋不足的梁采用4种不同的锚固方法进行粘钢加固,并将加固梁与全配筋的对比梁进行对比,分析了在静载作用下采用4种不同锚固方式粘钢加固的梁端负弯矩区的受拉钢筋应变、钢板应变以及跨中挠度的发展规律.试验结果表明,钢板转角处的刚度和梁、柱在转角处箍板的锚固强度是影响锚固效果的主要因素,增强钢板转角处的刚度能更好地发挥钢板的能力,实际加固效果也更能接近设计要求.

Based on the results of the static loading test on the four RC Beam - column＇ s Joints Strengthened by gluing steel plates and the two RC Beam - column＇ s Joints without being strengthened by gluing steel Plates, the strain of the tensile steel and the strain of steel plates in the negative moment region of the girder ends and the deflection of midspan with four different kinds of anchoring methods under the action of the static load are analyzed. The results show that the corner stiffness of the steel plate and beams and the strength of the Hoop board in the corner of columns are the main factors leading to different anchor effect in the test, and in- creasing the corner stiffness of the steel plate can fulfill to the ability of the steel plate better, and the actual reinforcement effect can also better satisfy the design requirement of reinforcement effect.