http://103.99.128.19:8080/xmlui/handle/123456789/465 IEER all digital contents Sun, 19 Apr 2026 10:37:08 GMT 2026-04-19T10:37:08Z http://103.99.128.19:8080/xmlui/handle/123456789/518 Title: PERFORMANCE BASED SEISMIC DESIGN OF REINFORCED CONCRETE BUILDING FRAMES Authors: Rana, Sohel Abstract: Buildings and other structures must be designed to perform satisfactorily to withstand earthquake, provide safety to human lives, and to minimize the economic losses from the damages, if any. Current code-prescriptive forcebased design intends to provide strength and ductility to structures for life safety, but actual performance is never assessed. Structures designed with a code-based approach experienced extensive damage leading to enormous economic loss and high repairing costs in the past earthquakes (e.g., 1994 Northridge and 1995 Kobe earthquake). With a view to enhancing safety and reducing damage, i.e., emphasizing the performance of structures accelerated the development of performance-based seismic design. This study aims at designing reinforced concrete building frames following performance-based earthquake engineering approach. An archetype eight storied RC building has been selected and a frame has been analyzed and designed following the seismic design approach of the BNBC 2020. Nonlinear time history analyses using suitable earthquake ground motion records have been performed to assess the performance of the code designed building frame. The selected ground motions have been matched with acceleration response spectra of required earthquake hazard levels to check the selected performance objectives. Story drift, an indicator of damage, has been selected as an engineering demand parameter to quantify performance. Then, the frame has been designed using the performance based seismic design approach meeting the selected performance objectives. Finally, the effects of base flexibility on the responses of the building in force-based and performance-based design approaches have also been assessed. The present study will help designers, owners, and stakeholders to make intelligent decisions in designing new or strengthening existing buildings to achieve the required performance of the structures. Description: A Master of Engineering Thesis from the Institute of Earthquake Engineering Research. Thu, 21 Mar 2024 00:00:00 GMT http://103.99.128.19:8080/xmlui/handle/123456789/518 2024-03-21T00:00:00Z http://103.99.128.19:8080/xmlui/handle/123456789/477 Title: Structural Performance of Inclined Shear Key in Steel- Concrete Composite Construction Authors: Dey, Rony Abstract: The use of steel-concrete composite structures is growing in popularity within the construction sector. In steel-concrete composite structure full composite action between steel and concrete is developed using shear connector. Shear connector transfer the transverse shear developed at the interface of steel and concrete. Headed shear stud is the most common type of shear connector which is conventionally welded perpendicularly to the flange surface of the steel beam with zero inclination. Some of the shear connectors unconsciously get welded at an inclined angle during this process. Design equations are not available for inclined shear key in the current design codes like Eurocode 4, CSA S4-14, BNBC- 2020, AASHTO LRFD. Here an attempt has been made to investigate the structural performance of inclined shear key in steel-concrete composite construction. A numerical finite element model of push out test of steel-concrete composite structure as per Eurocode is developed using FEA software ANSYS. The developed FE push-out test model for a 19 mm perpendicularly placed headed shear stud is validated and its results are compared with the previous experimental test. The ultimate shear resistance of a perpendicularly welded headed shear stud obtained from FE analysis is found to be very close to that calculated using the BNBC-2020 & AASHTO LRFD recommended design equations. The ultimate shear resistance of 15, 30 & 45-degree inclined headed shear stud is found to be increased by 15 %, 17.33 % & 24 % respectively for the inclination of headed shear stud along the direction of loading and decreased by 56 %, 42.57 % & 46.93 % respectively for inclination opposite to the direction of loading. For inclination along the direction of loading, 15-degree & 30-degree inclined Headed shear stud exhibits ductile behaviour with maximum slip value 10.79 mm & 7.97 mm respectively but for 45-degree inclination headed shear stud is found to be brittle with maximum slip value 3.95 mm. Headed shear studs are vi found to be brittle for all the angles of inclination opposite to the direction of loading having maximum slip less than 6 mm, which is the Eurocode 4 recommended minimum threshold for ductile behaviour. Hence, headed shear stud shall be welded to the flange surface very carefully in steel-concrete composite construction. Only if the direction of loading is known, inclined shear keys may be a better choice for enhanced composite action of steel concrete composite structures. Description: M. Eng. in Earthquake Eng. Wed, 26 Jun 2024 00:00:00 GMT http://103.99.128.19:8080/xmlui/handle/123456789/477 2024-06-26T00:00:00Z http://103.99.128.19:8080/xmlui/handle/123456789/472 Title: EFFECTS OF PLAN ASPECT RATIO ON SEISMIC RESPONSES OF RC BUILDINGS BY TIME HISTORY ANALYSIS Authors: SAJED, TOFIQ BIN Abstract: Seismic analysis is one of the major developments in the field of civil engineering. Among many seismic analysis methods, nonlinear time history method is undoubtedly the most realistic method as it directly applies the earthquake load on the structure. Selection of ground motion history is important in time history analysis as it should be compatible with the existing building code of the country. Meanwhile, seismic responses of the structure are greatly influenced by its shape, size and geometry. In this study, nonlinear time history analysis has been used to evaluate the seismic responses of three buildings in both X and Y directions with three different plan aspect ratio (length to width ratio) having same area and height. The selected ground motion history is used in the analysis after matching with the design response spectrum of Bangladesh National Building Code (BNBC). Finally, the effects of plan aspect ratio on seismic responses of the buildings are evaluated in terms of displacements and story drifts. Although, all three building models consist of same plan area, story displacements increase in both X and Y directions with the increase of plan aspect ratios. However, maximum story displacements and story drifts are largely increased in Y direction compared to that in X direction as building models become less stiff in Y direction with the increase of aspect ratios. Description: A Post Graduate Diploma Thesis from the Institute of Earthquake Engineering Research (IEER) Wed, 15 May 2024 00:00:00 GMT http://103.99.128.19:8080/xmlui/handle/123456789/472 2024-05-15T00:00:00Z