随着荷载进一步加大，直榫节点变形更加明显。挤压劈裂现象出现在榫头与卯口

As the load increases further, the deformation of the straight tenon joint becomes more obvious. The phenomenon of squeezing and splitting occurs in the part of the tenon and the mouth. The cracks can be seen on the wooden beams and pins. The sound becomes a strong cracking sound. At this time, the straight tenon joint enters the overturning state, and the loading force of the wooden beam end decreases. The loading test is over, see Figure 3.

As the load increases further, the deformation of the straight node becomes more obvious. Squeeze cracking occurs in the part of the hoe and the crucifixion, cracks can be seen on the wooden crucifixion and pins, the sound becomes a strong cracking and destruction sound, when the straight node enters the overturning state, the loading force of the wood crucifixion end drops, the loading test is over, see Figure 3.

With the further increase of load, the deformation of straight tenon joint is more obvious. The compression splitting phenomenon appears in the part of tenon and mortise opening. The crack can be seen on the wooden brace 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 the wooden beam decreases. The loading test is finished, as shown in Fig. 3.<br>