性能增强再生混凝土梁受弯性能试验研究

Flexural Performance Experimental study on the Enhanced Performance Recycled Concrete Beams

设计并完成了6根再生混凝土梁试件,其中1根普通再生混凝土梁,3根不同硅粉掺量再生混凝土梁,2根子午线钢纤维与尼龙纤维组成的混杂纤维再生混凝土梁。对该6根梁进行了抗弯性能试验,探讨了普通及性能增强再生混凝土梁受力变形机理及破坏特征。试验结果表明:普通及性能增强再生混凝土梁受力过程仍具有较为明显的弹性、开裂、屈服、极限四个过程;其受力过程基本符合平截面假定,能够按照混凝土结构设计规范(GB50010-2010)进行结构设计;相较于普通再生混凝土,性能增强再生混凝土梁在抗开裂及极限承载力等性能方面更为优异,能够应用于工程实际。最后利用ABAQUS有限元软件对试验梁试件进行了有限元分析,结果表明有限元分析所获得的受弯过程与试验过程吻合较好,验证了试验的正确性。

Six recycled concrete beams were designed and completed. One of them was an ordinary recycled concrete beam, 3 of them were the beams with different content of silica fume, and the others were hybrid beams in which the doping fibers were composed of radial steel fibers and nylon fibers. The flexural behaviors of all the beams were investigated, and the deformation mechanism and failure characteristics were explored in the ordinary and enhanced performance recycled concrete. Based on the experimental results, the following conclusions are drawn, both the ordinary and enhanced performance recycled concrete beams have elastic, cracking, yield, and ultimate point~ Their force process basically obliges to the plane section assumption so that the ordinary and enhanced performance recycled concrete structure could be designed through Code for design of concrete structure （GB50010- 2010）. In comparison to the ordinary recycled concrete, the enhanced performance recycled concrete beams were superior in cracking-resistant and ultimate bearing capacity, which enable them to be applied in practice engineering. Finally, the beam specimens were further analyzed by finite element analysis with ABAQUS software. The bending process obtained by finite element analysis agreed well with the testing results, which also verify the correctness of the test.