在加载初期，节点的木枋榫头、木柱卯口和木销钉之间逐渐挤压密实，并伴随木

In the initial stage of loading, the joints between the mortise and tenon, the mouth of the wooden column and the wooden dowels are gradually squeezed and compacted, and the wood makes a slight noise. At this time, there is no obvious damage to the tenon and tenon joints and the dowels. <br>As the load continues to increase, and the deformation and displacement of the wooden beam increases, for the open-pin straight tenon joints, the wooden beam cannot move due to the limitation of the pin, but the top and bottom sides of the wooden beam gradually draw out the tenon As it increases, the squeezing action between the tenon and the mouth gradually intensifies, and the noise of the joint due to the squeezing is also getting louder. <br><br>As the load is further increased, the deformation of the straight tenon joint becomes more obvious, the tenon and the mouth of the tenon are partially compressed and split, cracks appear on the wooden beam and the pin, and the sound becomes a strong cracking sound. At this time, the straight tenon joint Entering the overturning state, the loading force of the wooden beam end drops, and the loading test ends, as shown in Figure 3.

In the early stage of loading, the node's wooden hoe, wooden column mouth and wooden pin nails gradually squeeze dense, and accompanied by a slight sound from the wood, when the node and pin are not obviously damaged.<br>With the increasing load, as well as the increase of the deformation displacement of the wood molyblin, for the open-pin direct slug node, the wood molyblin due to the restriction of pins, can not occur axis movement, but the top and bottom surface of the wood molybder pull volume gradually increased, the squeeze between the hoe and the mouth gradually intensified, the node due to the squeeze produced a louder and louder.<br><br>As the load increases further, the deformation of the straight molybsen node becomes more obvious, the partial compression cracking phenomenon appears on the hoe and the crucifixion, cracks appear on the wooden crucifixion and pin nails, and the sound becomes a strong cracking and destruction sound, when the straight moth node enters the overturning state, the loading force of the wood crucifixion end drops, the loading test ends, see Figure 3.

At the initial stage of loading, the joints and pins of the joints are compressed and compacted gradually, and the wood makes a slight noise. At this time, there is no obvious damage to the tenon mortise joint and the pin.<br>With the increasing of loading and the increase of deformation and displacement of the wood brace, for the straight tenon joint with open pin, the wood beam can not move its axis due to the limitation of the pin, but the amount of tenon pulling on the top and bottom surface of the wooden brace increases gradually, the extrusion effect between the tenon and the mortise is gradually intensified, and the noise of the joint due to extrusion is also increasing.<br>With the further increase of load, the deformation of straight tenon joint is more obvious, the local compression and splitting phenomenon appears between tenon and mortise, cracks appear on the wooden beam and pin, and the sound becomes strong splitting damage sound. At this time, the straight tenon joint enters the overturning state, and the loading force at the end of wooden beam decreases. The loading test is finished, as shown in Fig. 3.<br>