PERILAKU BALOK BETON SANDWICH DALAM MENERIMA BEBAN LENTUR

• Main Author: , Firdaus
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/4911
• Institution: Institut Teknologi Bandung

<b>Abstrack</b><p align=\"justify\"> <br /> Beams are structural members carrying bending moments due to transverse external loads. Theoretically, it is assummed that at the stage when concrete cracks, all tension on concrete are neglected. Bending moment at the cross section of the crack location is held by a couple of forces ; compressive force comes from the compression part and tensile force contributed by the reinforcement. Such a flexural response, implies that, the middle part of the cross section arround the neutral axis does not carry any stress. This assumption leads to the idea to compose a sandwich beam consisting of a skin of strong normal concrete and a core of light weight concrete of less strength. <br /> The main investigation was undertaken to study experimentally the flexural behaviour of normal lighweight sandwich beams and the shear mechanism at the interface zone between the different layers as well. All specimens consisted of three layers. Middle layers were made of 30 MPa lightweight concrete held between the others two layers of 50 MPa normal concrete. Four reinforced concrete bending beams and eightteen shear specimens with four different types of shear connectors were tested. The bending beams were 100 mm wide, 200 nun deep and 2100 mm long. They were tested under static and cyclic loading condition. The shear specimens of 100 mm x 200 mm x 200 mm dimensions, were tested just under static loading conditions. <br /> It may be observed from the load-deflection curves obtained, that, flexural capacity is much influenced by loading system, composite condition due to the connectors and the properties of the middle layer concrete. It was also found from the firctional testing that bonding strength tends to the increase significantly if cross sections consisted of a core of lightweight concrete.