Investigation On Mechanical Properties Of GluBam I-Joists

Under the concept of green building, we are increasingly chasing in some natural and renewable building materials instead of the traditional reinforced concrete material which is of high energy consumption and low efficiency. This is the direction of the reform and innovation and the facing challenge for the traditional field of civil engineering in the 21 st century. Under the basic state of the Chinese forest resources, some experts and scholars put forward to developing new environmental protection materials, modern bamboo structure arised at the historic moment. With reference to the development of modern wood structure, the author put forward a new type of bearing component——Glu Bam I-shaped Joists.In the second chapter in this paper, firstly, the author discussed the failure criteria of Glu Bam and described some research on the bamboo beam at home and abroad. Then due to the current lack of domestic theoretical study of Glu Bam I-shaped Joists, the author drew on relevant theory of the prefabricated wood I-Joists. The author introduced the prefabricated wood I-Joists which had developed rapidly abroad, mainly about their development, processing technology and design principles. At the same time, this chapter expounded related research theories about the prefabricated wood I-Joists which were put forward by some experts and scholars at home and abroad, finally the author indicated the prefabricated wood I-Joists would have a certain development prospects in our country.In the third chapter in this paper, firstly, the author studied the density and moisture content of the Glu Bam bamboo whose fiber ratio were 4: 1 and 1: 1. The experimental results showed that Glu Bam bamboo hasd relatively high density and good stability, and it was the material of suitable moisture, could be widely used in the production of Glu Bam I-shaped joists. Then, taking into account the immaturity of Chinese current lengthening technology, the author chose the Glu Bam I-shaped joists which were of the largest span in the case of no lengthening. The loading experiments of the fourteen Glu Bam I-shaped joist specimens were carried out by using four-point loading method. The failure process, mechanism and load carrying capacity were investigated. The testing results indicated that the Glu Bam I-shaped joists behaved well and exhibited excellent mechanical properties. The strain measurements indicated that the plane assumption could be applied to the Glu Bam I-shaped joists, and the stiffness could be calculated based on conventional beam theory. The ultimate strength of the Glu Bam I-shaped joists could be calculated based on the theoretical equation of lateral torsional buckling.In the fourth chapter in this paper, using ABAQUS/CAE finite element software, the author analyzed the Glu Bam I-shaped joists. Through the establishment of model, the stress contours and deformation maps were obtained. C omparing the finite element simulation and experimental results, the author found ABAQUS c ould simulate the stress and strain situation of Glu Bam I-shaped joists.