Effect of longitudinal joint on the shear-key of hollow core slab which function as an rigid diaphragm

Various types of reinforced concrete floors can be applied to building construction. The floor of the building can be made of cast in place or precast concrete. The floors should function as a rigid diaphragm, in order to distribute the lateral forces on the building frame. While the floor is made of precast concrete, especially those without overtopping, should be arranged in such a way to function as a diaphragm. In order for the precast slab can function as a diaphragm, the components must be connected to the building frame and between the component itself . Some of them are drag strut, boundary element (chord), transverse joint, collector and longitudinal joint. This paper will discuss the influence of the longitudinal joint shear key with some types. The test specimen is modeled as two HCS are mounted parallel to each other , then the both of HCS are combined with perimeter beams to obtain the same model with the actual conditions and simplify to execute. All models of the test specimen are made to represent the three types of shear key. The test specimen is loaded the shear force and observed the structure behavior and crack patterns

Effect of longitudinal joint on the shear-key of hollow core slab which function as an rigid diaphragm

Various types of reinforced concrete floors can be applied to building construction. The floor of the building can be made of cast in place or precast concrete. The floors should function as a rigid diaphragm, in order to distribute the lateral forces on the building frame. While the floor is made of precast concrete, especially those without overtopping, should be arranged in such a way to function as a diaphragm. In order for the precast slab can function as a diaphragm, the components must be connected to the building frame and between the component itself . Some of them are drag strut, boundary element (chord), transverse joint, collector and longitudinal joint. This paper will discuss the influence of the longitudinal joint shear key with some types. The test specimen is modeled as two HCS are mounted parallel to each other , then the both of HCS are combined with perimeter beams to obtain the same model with the actual conditions and simplify to execute. All models of the test specimen are made to represent the three types of shear key. The test specimen is loaded the shear force and observed the structure behavior and crack patterns

Increasing the Displacement Ductility Factor of Spun Pile Using Concrete Infill

Displacement ductility is one of the parameters used to measure the seismic performance of a structure. This study experimentally determines the increase in displacement ductility of the spun pile with 400 mm of outer diameter and 100 mm of wall thickness using concrete infill cast inside the hollow of the pile. The spun pile and concrete infill's concrete compressive strength was 54.4 MPa and 33.0 MPa, respectively. Loading was conducted with constant axial and reversed lateral flexural loads. A total of six samples were tested with different axial loads of 392 kN (0.08fc'Ag) for S-DB-1, S-DB-2, S-DB-5, and 784 kN (0.16fc'Ag) for S-DB-3, S-DB-4, S-DB-6 with the reverse flexure load applied in the middle span of the pile. The results showed spun piles with concrete infill could resist the flexural load combined with axial loads until the displacement ductility 5.8 for P0 = 0.08fc'Ag, and 3.7 for P0 = 0.16fc'Ag, respectively. Compared with the ordinary spun piles, which had a hollow section, the presence of concrete infill due to the presence of the concrete infill the displacement ductility increased by 18% when loaded with 0.08f'cAg and 42% at 0.16f'cAg of axial loads. In conclusion, according to seismic codes, displacement ductility evaluation showed that tested piles for plastic concept design applications are appropriate for moderate seismic risks category state under axial loads of 0.08fc'Ag. The increasing of the axial load becomes 0.16fc'Ag decreasing the displacement ductility to become less than 4, applicable for low seismic risks category state