Li Chunbao, Cao Hui, Guan Di, Li Shen, Wang Xukai, Soloveva Valentina Y, Dalerjon Hojiboev, Fan Zhiguang, Qin Pengju, Liu Xiaohui
College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao 266580, China.
Construction Project Management Branch of China National Petroleum Pipeline Network Group Co., Ltd., Langfang 065001, China.
Materials (Basel). 2022 Jul 13;15(14):4882. doi: 10.3390/ma15144882.
This paper proposes a new form of composite beam: a multi-cavity steel-concrete composite beam. This composite beam uses internal perforated steel plate to connect the concrete with the steel structure, and shear connectors are no longer required, which is more suitable for industrial production. The mechanical properties of a multi-cavity steel-concrete composite beam in industrial applications are studied to avoid failures. In this paper, two multi-cavity steel-concrete composite beams with a size of 2500 mm × 200 mm × 300 mm were prepared, in which the angle of internal porous steel plate was set as 60° and 75°, respectively. A full-scale static load test was conducted on the beams to research its deformation and failure modes. The finite element software ANSYS was used to perform finite element modeling of multi-cavity steel-concrete composite beams and to analyze the influence of concrete strength, steel strength, porosity, and the angle of internal porous steel plate on the mechanical properties of composite beams. The results are as follows: before the composite beam reaches its serviceability limit state, its deformation basically shows a linear change; with the increase of load, the plastic deformation is gradually obvious, which can still provide a certain bearing capacity in the failure stage; the bearing capacity of the composite beam is positively correlated with the strength of concrete and steel, while negatively correlated with the porosity and the angle of internal porous steel plate; composite beams have large bearing capacity, good ductility and integrity.
多腔钢-混凝土组合梁。这种组合梁采用内部穿孔钢板连接混凝土与钢结构，不再需要抗剪连接件，更适合工业化生产。研究了多腔钢-混凝土组合梁在工业应用中的力学性能，以避免失效。本文制备了两根尺寸为2500 mm×200 mm×300 mm的多腔钢-混凝土组合梁，其中内部多孔钢板的角度分别设置为60°和75°。对梁进行了足尺静载试验，研究其变形和破坏模式。采用有限元软件ANSYS对多腔钢-混凝土组合梁进行有限元建模，分析混凝土强度、钢材强度、孔隙率和内部多孔钢板角度对组合梁力学性能的影响。结果如下：组合梁在达到正常使用极限状态之前，其变形基本呈线性变化；随着荷载的增加，塑性变形逐渐明显，在破坏阶段仍能提供一定的承载力；组合梁的承载力与混凝土和钢材的强度呈正相关，与孔隙率和内部多孔钢板的角度呈负相关；组合梁具有较大的承载力、良好的延性和整体性。
