DEVELOPMENT OF EARTHQUAKE RESISTANT 3D CONCRETE PRINTING (3DCP) WALLS USING NUMERICAL SIMULATION WITH LS-DYNA

• Main Author: Ferlin Kwannandar, Fritz
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/86895
• Institution: Institut Teknologi Bandung

House construction processes still utilize conventional approaches despite the availability of contemporary construction technologies such as 3D Concrete Printing (3DCP). The advantages of using 3DCP in the construction process varies, it accelerates the construction process, minimize work-related accidents, reduce construction costs especially in the use of formwork, provides a higher degree of flexibility in generating building shapes, and has a higher extent of precision. Regardless of its advantages, this tehcnology also has limitations that need to be adressed. Several aspects that need to be adressed are pumpability and printability. In 3DCP, the concrete mixture must be delivered through a hose to the nozzle for printing (pumpability) while maintaining a certain stiffness to ensure that the printed layers could retain their shape (printability). Another pressing concern to be adressed is the weakening of interlayer connection as the printing process occurs at different times on different layers (an indication that it is not monolith). This research aims to study the behavior of the 3DCP wall and its usability for single-story house buildings in Indonesia, considering the weakening that occurs within its interlayer connections. The elemental structure under review is a 3DCP wall which was given a tie element such as confined masonry. An analysis to justify that this wall structure is applicable in Indonesian house buildings is necessary as Indonesia is an earthquake-prone area. Considering the wall’s applications for a single-story house, which implies high rigidity, the approach in the acceptance criteria is based on strength, as plastic deformation int he structure is not expected. LS-DYNA software is used to study the behavior of this wall and to generate wall capacity which will be compared with the demand of maximum earthquake occurring in Indonesia. The load applied to the analyzed wall is using pushover. Modeling is divided into two models : the first model uses interlayer strength parameters based on brick standards, while the second model uses test results from ITB laboratory. The results of this study indicate that the aforementioned wall has a structural capacity above the maximum earthquake demand occurring in Indonesia based on the current seismic map. Additionally, the failure behaviour of this wall is initiated by flexural failure, followed by sliding shear failure. From the results, it can be concluded that the 3DCP wall structure that was analyzed can be used for single-story house buildings in Indonesia.