Mechanical Performance Of A New Hanger Joints Connecting Primary And Secondary Beams In Timber Structure

Curling and wheelchair curling competitions will be held in the Water Cube during the 2022 Winter Olympics and Winter Paralympics.In order to meet the requirements of the Winter Olympic Stadium,the water cube interior venue will be renovated to temporarily convert the indoor swimming venue into an ice-cold venue.Imagine building an ice support system above the swimming pool of the original conventional venue.The upper support plane is made of wooden box.In order to meet the requirements of shear capacity of the joints of the primary and secondary beams of the wooden box,we designed a new type of hanger joints for the primary and secondary beam of wood structure.This paper conducts an experimental study on the new hanger joints.The mechanical properties of the joints of the hanger are explored through the combination of finite element numerical simulation and theoretical analysis.The failure mode and force mechanism of the new hanger member are analyzed.The effects and rules of different parameters on the ultimate bearing capacity of the hanger are summarized.The main contents are as follows:(1)The vertical loading test of the hanger joints of 9 different parameters was designed and completed.The variation parameters of the test were the thickness of the hanger piece,the thickness of the main beam,the number of back nails and the thickness of the secondary beam.The effects of different parameters on the failure mode,bearing capacity and stiffness of the hanger member are analyzed.The test determined that the new hanger joint section has better ultimate bearing capacity,and determined two failure modes of the hanger member joint: the flange of the hanger member is broken,and the back nail of the hanger member is broken.(2)The finite element analysis software ABAQUS is used to simulate the hanger nodes of the experiment.An accurate and effective modeling method is proposed.The experimental results and experimental phenomena of vertical loading are compared and analyzed,verify the accuracy of finite element modeling(3)A lot of parametric analysis is carried out on the connection joints of the new wooden structure hanger.The effects of the thickness of the hanger,the thickness of the primary and secondary beams,the number of nails and the strength on the ultimate bearing capacity of the joints of the hanger are considered.The influence of the degree of constraint of the main beam on the mechanical performance of the joints of the hanger is summarized.Compared with the traditional hanger member node,the superiority of the new hanger member node in the force mode is verified.(4)The detailed mechanical performance and failure mode analysis of the hanger are carried out,and the simplified force model and the ultimate bearing capacity formula of the hanger member are proposed.