型钢连接节点装配式混凝土梁力学性能研究

Study on Mechanical Properties of Fabricated Concrete Beams with Steel Section Joints

目的提出一种新型型钢节点连接方法,研究该节点对装配式混凝土梁力学性能的影响.方法设计制作4根试验梁,完成试验梁两点加载试验,分析型钢连接节点位置对试验梁承载力、挠度、钢筋及混凝土应力变化的影响;在试验基础上,利用ABAQUS软件建立了型钢连接节点装配式混凝土梁有限元模型,并验证了模型的准确性.结果型钢连接节点装配式混凝土梁的承载力随着节点连接部位距支座距离的增加而逐渐降低,当型钢连接位置距梁端距离超过310 mm时,承载力降低约10%;试验梁达到极限承载力时,纵筋和型钢均未屈服,且纵筋应变随着型钢连接位置距支座距离的增加而减小.结论型钢节点连接装配式梁的受弯、受剪性能良好;工程设计中,型钢连接位置距梁端距离不宜超过310 mm,即l_c/h>0.89.

In order to propose a new type of steel joint,and to study the influence of this joint on the mechanical properties of assembled concrete beams.Four test beams were designed,manufactured,and tested under two-point load patterns,then the influence of the location of the steel connection node on the bearing capacity,deflection,steel bar and concrete stress of the test beam was analyzed;Based on the experiment,the ABAQUS was used to establish a finite element model of the assembled concrete beam with steel connection nodes,and the accuracy of the model was verified.The bearing capacity of assembled concrete beams with steel connection nodes gradually decreases as the distance between the connection position of the node and the support increases,when the distance between the connection point of the node and the end of the beam exceeds 310 mm,the bearing capacity of the test beam is reduced by about 10%;When the load of the test beam reaches the ultimate bearing capacity,neither the longitudinal reinforcement nor the section steel yields,and the longitudinal reinforcement strain decreases as the distance between the joint connection position and the support increases.The bending and shearing performance of the assembled steel beam connected with the steel joint is good;When performing structural design,the distance between the node connection position and the beam end should not exceed 310 mm,that is,l_c/h>0.89.