新型预制钢-混凝土组合梁受力性能分析

Analysis of Mechanical Properties of New Precast Steel-Concrete Composite Beam

为降低预制钢-混凝土组合梁在安装施工过程中的经济成本,推动装配式建筑的发展,提出一种新型预制钢-混凝土组合梁。基于有限元软件ABAQUS建立了预制钢-混凝土组合梁试件非线性模型,研究其在单调载荷作用下不同参数对试件的破坏过程、承载性能和变形性能的影响规律。结果表明:新型预制组合梁的承载性能和变形性能均优于传统截面形式的预制组合梁;各个试件的破坏过程基本相似,均表现为典型的受弯破坏;悬臂段钢梁外伸长度和钢接头埋置长度的增加可以明显提升试件的变形性能,但对其承载性能的影响较小;增加梁内纵向钢筋配筋率明显提高了试件的承载力,但使得延性降低,在设计时新型预制钢-混凝土组合梁内纵向配筋率不宜超过1.5%。

In order to reduce the economic cost of precast steel-concrete composite beams during installation and promote the development of prefabricated buildings,a new type of precast steel-concrete composite beams was proposed based on the existing research results.Based on the finite element software ABAQUS,a nonlinear model of precast steel-concrete composite beam specimens was established to study the influence of different parameters on the failure process,bearing capacity and deformation performance of specimens under monotonic loading.The results show that the load-bearing and deformation properties of the new precast composite beam were better than those of the traditional precast composite beam.The failure process of each specimen was basically similar,and all of them showed typical bending failure.The increase of the cantilever beam extension length and the embedded length of the steel joint could significantly improve the deformation performance of the specimen,but had little effect on its bearing performance.Increasing the ratio of longitudinal reinforcement in the beam obviously improved the bearing capacity of the specimen,but reduced the ductility.The ratio of longitudinal reinforcement in the new precast steel-concrete composite beam should not exceed 1.5%.