Mechanical properties of bamboo scrimber under bolted connections with steel splints

Taking the bolt edge distance and spacing of bolts as the influencing factors, the tensile test of 8 groups (5 repeated groups in each group) was designed by connecting the parallel-to-grain specimens of bamboo scrimber with steel splint bolts. Based on the 5%D offset method of the American code, the key mechanical properties such as yield load and ultimate load are obtained. The test results show that the change of the bolt edge distance has little effect on the mechanical properties of the tensile specimen under the design size of the specification. The change of pitch of bolts has a significant effect on the yield load of the specimen. With the increase of spacing, the yield load and ultimate load increase gradually, reaching the maximum at 6D, and then decreasing slightly. Four typical failure modes and typical load-displacement curves of all specimen groups were analyzed. The difference between the predicted value and the experimental value in different standard calculation methods was compared. Based on the failure mode IV of double shear connection in Johansen and the cable effect and group bolt effect, the calculation formula of shear bearing capacity of steel splint bolt connection suitable for bamboo scrimber was proposed.