Performance of Withdrawal Capacity for Mengkulang Glulam Perpendicular to the Glue Line for 14mm and 20mm Bolt Diameter

Abstract

Withdrawal capacity is defined as the amount of resistance to withdrawal force in a plane normal to the surface panel. It is caused by density and internal bonding of the panel. Withdrawal capacity is one of the factors that affect the load carrying capacity of the timber connection apart from embedment strength and fastener yield moment. The European Yield Model (EYM) theory is used to predict the load capacity of the timber connection under lateral load. The sample panel is made of Glued Laminated Timber (Glulam) using Mengkulang timber species. Although Mengkulang Glulam has a good weight to strength ratio as compared to typical concrete material but it is still not widely used in Malaysia. This is mainly due to a very limited exposure on the Mengkulang Glulam usage. Withdrawal capacity is determined according to the ASTM D1761-12 using one-hole test method. Also, the ASTM D1761-12, EC5:2008 is used to determine the withdrawal capacity output. In this experiment a mechanical fastener, bolt; 14mm and 20mm were used to fix the sample panels onto the test jig. The bolt diameter influenced the withdrawal capacity. It was observed that the withdrawal capacity of 20mm bolt diameter was better than the 14mm diameter with an increment of 48.6%.