新型防护框架梁M-φ曲线及延性分析

为了有效提高防护框架梁的受弯性能,增强防护结构延性,将高强细晶粒钢筋和纤维增强水泥基复合材料组合形成一种新型防护框架梁。应用MATLAB编程计算和构件试验研究其截面M-φ曲线,并与普通防护框架梁对比。计算和试验结果表明:在弯矩值接近的前提下,新型防护框架梁的曲率值要大于普通防护框架梁,曲率值愈大,其构件弯曲性能愈好。对比2类防护框架梁的曲率延性比可以看出:新型防护框架梁延性比可达5.78,高于同等承载力条件下普通防护框架梁的延性比。

Bending moment-curvature and ductility of new protective framework beams

To improve the flexural behaviors of protective framework beams to meet the requirement of ductility, hot rolled bars of fine grains 500(HRBF500)and fiber reinforced cementitious composite(FRCC)were combined to form high-performance reinforcement cementitious protective framework beams. Bending moment-curvature(M-φ)relationship was studied by MATLAB software calculation and specimens test, and it was compared with that of the common frames. The result shows that in the same flexural capacity conditions, the curvature of new protective beams is greater than that of the common protective framework beams. The larger the curvature, the larger the flexural capacity. Comparing the two curvature ductility ratios, the ratio of the new protective framework beams is 5.78, which is higher than that of the common one.