胶合木钢填板-螺栓节点抗弯刚度研究

Research of bending stiffness of glulam bolted joints with slotted-in steel plates

为明确胶合木钢填板-螺栓节点的半刚性特征,进行了考虑螺栓行距、列距、列数和胶合木截面高度等参数变化的胶合木钢填板-螺栓节点抗弯试验。得到节点抗弯刚度后与欧洲木结构设计规范((BSEN 1995-1:2004))、日本木质构造接合部设计手册里节点抗弯刚度公式计算结果进行对比,结果表明规范公式计算的节点抗弯刚度均小于试验值,通过修正规范公式可以得到更加准确的计算结果。针对日本木质构造接合部设计手册的公式引入了滑移系数修正值和顺纹嵌入刚度修正值,修正后的公式准确度高,在胶合木结构设计的过程中可以用于计算节点的抗弯刚度并得到节点抗弯刚度折减系数。

In order to clarify the semi-rigid characters of glulam bolted joints with slotted-in steel plates,bending experiments were conducted considering the variation of bolt row spacing,column spacing,column number and section height of glulam.Compared with experimental results of bending stiffness,the calculate results of bending stiffness formula in Design of timber structures(BSEN 1995-1􀏑2004)and Design Manual for Engineered Timber Joints were conservative.The results show that the bending stiffness calculated by the standard formula is less than the test value,and more accurate calculation results can be obtained by modifying the standard formula.The modified value of slip coefficient and parallel-to-grain embedded stiffness were introduced to modify the calculate formula in Design Manual for Engineered Timber Joints.This modified formula provides high accurate results,which could be used to calculate the bending stiffness of joints and obtain the reduction coefficient of bending stiffness of joints in the design of glulam structure.