الفهرس | Only 14 pages are availabe for public view |
Abstract According to most current design codes, it is stated that individual footings of a building shall be interconnected in two directions, generally at right angles, by ground beams. Those ground beams should be designed for a minimum downward load of q1 (10 kN/m recommended value) according to Eurocode 2 (EN I-1992-2004), should have a design strength in tension or compression at least equal to a force equal to 10% of SDS times the larger pile cap or column factored dead plus factored live load according to American Society of Civil Engineers (ASCE 7-16) or should be capable of carrying, in tension or compression, a force equal to the lesser of the product of the larger footing design gravity load times the seismic coefficient, SDS divided by 10 and 25 percent of the smaller footing design gravity load according to the International Building Code (IBC 2009), SDS depends on soil type and seismic ground motion. It can be observed from the previously mentioned codes’ values that some important parameters were not taken into consideration (building structural system, number of stories and ground beam location and cross-section). This study employs the direct analysis approach for soil-structure interaction and the equivalent linear local site response method, as well as the 3D viscous spring artificial boundary developed by Liu Jingbo and Du Yixin (2006) to investigate the effects of dynamic soilstructure interaction using SAP 2000. The fundamental objectives of this research study can be summarized as follows: Preparing a numerical model capable of representing the seismic response of framed structures under the effect of time history motion at the bedrock layer, Studying the soil filtration effect and wave propagation through soil layers and theireffect on structure behavior and determine the straining actions generated on the ground beams due to the earthquake and comparing it with the corresponding values from the international codes. Two earthquakes, El-Centrro and Kobe, are simulated using SAP2000 software on a 15-story framed building situated on clay soil in order to examine the viability of the finite element method used in this study and the result obtained from the finite element model is compared with the result obtained from shaking table test conducted by Xiaofeng Zhang and Harry Far (2021). The obtained results throughout the tables and graphs in this study conclude that, the minimum recommended design values by the American Society of Civil Engineers (ASCE 7-16), Eurocode 2 (EN I-1992-2004) and the International Building Code (IBC 2009) for tensile axial force in tie beams to the maximum axial compressive force in columns are very conservative for the most studied cases and higher than all studied cases. |