Study On Mechanical Behavior Of The Broken Column Wood Structure Beam-column Connection Joints

In the construction of wooden structures,the design of nodes is the more critical part.According to the analysis of statistical data,when the wooden structures are affected by earthquakes,typhoons,etc.The main cause of the destruction of the entire structure is often the improper design of the nodes.In addition,the overall strength and stability of the wood structure mainly depends on the strength and stiffness of the joints in the node area.Therefore,the node design has a very important position in the design of wood structures.The traditional wooden structure buildings built columns before beams,usually built with layers of upper and lower columns,but the construction is difficult and inefficient.Most of the modern wooden structures are connected by metal parts.Although the connection between the beams and columns can be solved commendably,the whole column is used,which can not solve the problem of layered assembly.For the multi-rise wooden structures,the whole column can guarantee the vertical continuity of the structure,but it is difficult to transport and hoist.Therefore,this paper designs a broken column beam-column connection node,which adopts the upper and lower column sections to realize the layered construction of wood structure building,which makes it more suitable for modem assembly requirements and improves construction efficiency.In this paper,the combination of experiment,simulation and theory will be used to study the mechanical behavior of the joints of the broken column beam-column joints.The main research work is as follows:1.The mechanical properties of the joints of wood structures are related to the material properties of the wood used.Therefore,the material properties of the glued wood are tested at first in this paper,which provides data indicators for the simulation analysis of the finite element and the calculation of the bearing capacity of the joints.2.Perform monotonic loading tests on two types of broken column beam-column connection joints.It mainly studies the failure mode of the joints,the load-displacement curve of the beam end loading point and the displacement of the upper and lower columns,the load-displacement curve of the wooden beam and the upper and lower column measurement points.Then the influence of the height of the beam section on the deformation of the joint and the strain of each component is analyzed.3.Perform cyclic and repeated loading tests on two types of broken column beam-column connection joints.It mainly studies the failure modes of joints,the hysteresis curve,skeleton curve,stiffness degradation and energy dissipation capacity of the joints,and then analyzes the influence of the height variation of the beam section on the dynamic performance of the broken column beam-column joints.4.Through the ABAQUS finite element analysis software,the force variation of the two joints under monotonic loading is numerically simulated.The final deformation and load-displacement curves of the joints obtained by the simulation are roughly consistent with the experimental results.5.According to the relevant references,the calculation method of bearing capacity of broken column beam-column joints is studied,and the theoretical analysis results are compared with the experimental results,which shows that the consistency is good.