International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 07 | July 2023
p-ISSN: 2395-0072
www.irjet.net
Numerical Modeling of Prefabricated Large Panels Build in Albania from 1960 to 1970: Considerations and simple F.E.M. Simulations Flogerta Krosi[1]*, Nikolla Vesho[2]* [1*] Ass. Lecturer | Department of Architecture and Civil Engineering | POLIS University, Tiranë 1051, AL [2*] Lecturer | Department of Architecture and Civil Engineering | POLIS University, Tiranë 1051, AL
--------------------------------------------------------------------------***---------------------------------------------------------------------------Abstract: This study presents an analysis of different approaches and simplifying theoretical principles regarding the numerical calculations of connecting nodes and interaction of prefabricated elements, in buildings with large panels located in Albania, in areas with moderate seismicity using SAP2000 software that apply FEM for static linear models. Taking into account the large stock of buildings with prefabricated large-panels in Albania, built between 1960 and 1970, this study aims to make a current contribution to this category of existing structures. This research focuses on the analysis and modeling of large prefabricated panels, and connecting joints between them. The main purpose is the study of the local plan of the building including 2 panels, the connecting nodes, the support on the ground and the connection with the basement. Numerical models will be used for the study using finite element approach. The target is to create simple functional models of panels and their interaction against horizontal forces. The numerical models generated can help structural engineers in further studies, when the focus extends to the entire building under combinations of seismic actions.
Keywords: finite element; numerical model; prefabricated large panel; load simulation; joint connection 1. Introduction This research examines F.E.M. numerical modeling & techniques, challenges faced today and a site investigation of existing prefabricated large panels used in Albania between 1970 and 1990. These buildings were constructed using the old Albanian KTP-63 code. Accurate structural modeling is necessary to evaluate a building's seismic behavior. This entails developing digital representations of the building's geometry, components, and linkages. The reaction of the structure to seismic loads is simulated using finite element analysis (FEM) and other numerical simulations. The context of the Russian design code and the partial use of the Albanian KTP-63 code introduce specific considerations for the existing prefabricated large panels. Understanding the design principles, material properties and connection details specified in these codes is crucial for accurately modeling the behavior of these panels. Today's challenges associated with the existing prefabricated RC panels include their aging, potential deterioration, and compatibility with current seismic design standards (Eurocodes). A thorough site review of these buildings is essential to assess their current condition, identify any structural deficiencies, and evaluate the extent to which they comply with current seismic design requirements. The numerical modeling approach for these existing prefabricated large panels should consider accurate geometric representation, appropriate material properties, and the specific site conditions in Albania. Material properties can be obtained or reliable data sources, considering the age and condition of the panels. The modeling should also accurately represent the connections between panels, as they significantly influence the overall structural response. Connections can be explicitly modeled or approximated based on available information and the understanding of the original construction details. To conduct a comprehensive analysis, static and dynamic load conditions should be defined based on the specific conditions in Albania, including KTP-89/2. Local seismic hazard maps, historical earthquake data, or ground motion records can be utilized further as input for the numerical model. The analysis should encompass both global and local behavior, evaluating the response of individual panels and the overall structural system. Various analysis techniques, including linear and nonlinear static or dynamic analyses, should be employed to assess the structural response and identify potential retrofitting or strengthening requirements.
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