钢夹板螺栓连接胶合木梁抗弯性能研究

Study on bending behavior of glued wood beams connected with steel splints and bolts

为探讨钢夹板螺栓连接胶合木梁的抗弯性能,针对采用钢夹板螺栓连接进行接长的胶合木梁的构造特点,考虑拼接的两段梁是否来源于同一根胶合木、螺栓顺纹间距及螺栓并列、错列布置3个影响因素,设计制作13组共39根试验梁,进行抗弯性能试验。采用有限元数值模拟方法,探讨钢夹板螺栓连接胶合木梁的破坏机理及螺栓端距和直径、钢夹板和胶合木厚度等影响参数对其抗弯性能和承载力的影响规律。试验与计算结果表明:螺栓顺纹间距对钢夹板螺栓连接胶合木梁的抗弯性能影响显著,而螺栓并、错列布置方式与拼接的两段梁是否来源于同一根胶合木对钢夹板螺栓连接胶合木梁的抗弯性能影响较小。随着螺栓顺纹间距的增大,试件的初始抗弯刚度和抗弯承载力明显提高。采用钢夹板螺栓连接方式可以实现胶合木梁的接长,在一定范围内增大螺栓端距和直径、钢夹板和胶合木的厚度还能提高钢夹板螺栓连接胶合木梁的抗弯承载力。装配式木结构中可以采用钢夹板螺栓连接方式对胶合木梁进行接长,其抗弯性能受螺栓顺纹间距的影响较大。对螺栓端距、螺栓直径、钢夹板厚度、胶合木厚度的参数研究可为装配式木结构的设计与应用提供参考。

In order to study the flexural performance of glulam beams connected with steel splints-bolts,according to the structural characteristics of glulam beams which are extended by steel splint bolt connection,three influencing factors were considered,i.e.,whether the two spliced beams come from the same glulam beam,the bolts spacing along the grain of glulam beams,and the parallel or staggered arrangement of bolts.13 groups of 39 test beams were designed and manufactured.Then the flexural performance tests were carried out,the finite element numerical simulation method was used to explore the failure mechanism of glulam beams connected with steel splints-bolts,and certain influencing parameters such as the bolts end distances,the blots diameter,the steel splint and the glulam beams thickness were explored for their influence lawson the bending capacity and bearing capacity.Both the experimental and numerical simulation results showthat the bolts spacing along the glulam grain significantly affects the flexural performance of glulam beams connected with steel splints-bolts.However,the parallel and staggered arrangement of bolts and whether the two spliced beams are from the same glulam beams have little effect on the flexural performance of glulam beams connected with steel splints-bolts.With the increase of the bolts spacing along the glulam grain,the initial flexural rigidity and ultimate bearing capacity of the test beams are improved tremendously.The extension of the glulam beams can be realized by the adoption of the steel splint bolt connection method.Increasing the end distance,diameter of bolts and the thickness of steel splints and glulam beams within a specific range can also improve the ultimate bearing capacity of glulam beams connected with steel splints-bolts.In the prefabricated wooden structure,the glulam beams can be extended by the connection of steel splint-bolts,its flexural performance is mainly affected by the bolts spacing along the grain of glulam beams.The parameter research of bolts end distance,bolts diameter,the thickness of steel splints,and glulam thickness provide references for the design and application of prefabricated wooden structures.