Effect of Joint Gaps and Partial Plastic Deformation on Stiffness in Timber Construction and its Probability Evaluation

木结构在连接处的孔与紧固件之间有间隙和空隙。本文对带间隙节点和框架结构的性能进行了试验和理论分析。结果表明：1）间隙分布较宽时，节点刚度变化较大。随着节点单元数的增加，单元刚度的平均值减小，但方差趋于减小。2）压敏胶节点梁的弹性模量较小，但其动弹性与间苯二酚胶节点和钉节点梁的动弹性相当。梁节点的阻尼常数和冲击吸收能比其它节点的阻尼常数和冲击吸收能稍大。3）对带支撑的木结构承重墙进行了水平荷载和动力试验，并对节点采用弹性弹簧和转动弹簧的模型进行了分析。结果表明，节点变形对墙体总变形的贡献较大。4）对采用球节点的桁架结构进行了静、动水平荷载作用下的模态分析。计算结果表明，该方法可以应用于含间隙桁架结构的分析。

Timber construction has clearance and gap between holes and fastener in the joint. In this project the behavior of joint with gaps and structural frame were experimentally and theoritically evaluated. The results obtained were as follows.1) A wide distribution of gaps leads to a large variance in the stiffness of joints. When the number of units which compose joint increases, the average of stiffness per unit decreases, but the variance tends to be small.2) The modulus of elasticity of beam with pressure sensitive adhesive is small, but its dynamic elasticity is equal to those with resorcinol adhesive and nail joints. The damping constant and impact absorptive energy to failure of beam is a little larger than those of other joints.3) Horizontal load and dynamic test for wood bearing wall with braces was carried out and analyzed by models using elastic spring and rotation spring for joint. It shows that deformation of joint could strongly contribute to the total deformation of wall.4) Truss construction using ball-joint was applied to static and dynamic horizontal load and was analyzed by modal analysis method. Data indicated that this method could be applied in the analysis for struss construction with gaps.