高强再生混凝土T形截面梁受弯性能

为研究高强再生混凝土T形截面梁的受弯性能,对6个高强再生混凝土梁进行了受弯性能试验研究.试件分为2组:第1组为3个矩形截面梁试件,其中,1个为普通高强混凝土梁,1个为粗骨料取代率为50%的高强再生混凝土梁,1个为粗骨料取代率为100%的高强再生混凝土梁;第2组为3个T形截面梁试件,其中,1个为普通高强混凝土T形梁,1个为粗骨料取代率为50%的高强再生混凝土T形梁,1个为粗骨料取代率为100%的高强再生混凝土T形梁.基于试验,对比分析了各试件的承载力、延性、损伤破坏全过程.研究表明:高强再生混凝土梁仍具有较为明显的弹性、开裂、屈服、极限4个过程;其应力应变分布近似符合平截面假定,可按照混凝土结构设计规范(GB50010—2010)进行结构设计.

Flexural Performance of High Strength RAC T-shape Beam

In order to study the flexural performance of high strength recycled aggregates concrete ( HSRAC) beam, experiments of six high strength RAC beam models were conducted. The test models were divided into two groups. The first group included three rectangular section beam models with the same size, strength of concrete and reinforcement, the recycled coarse aggregate replacement rate of the models was 0%, 50% and 100%. And, the second group included three T-shaped cross-section beam models with the same size, strength of concrete and reinforcement, the recycled coarse aggregate replacement rate of models was 0%, 50% and 100%. The load-bearing capacity, ductility, and failure characteristics of the models were comparatively analyzed according to the test. The results show that HSRAC beams still has obvious four processes of elasticity, cracking, yield, ultimate, and the stress and strain distributions were in line plane assumption. Therefore, the HSRAC beams can be designed according to the Design of Concrete Structures ( GB50010—2010 ) .