Seismic Evaluation of Steel Moment Resisting Frames (MRFs)—Supported by Loose Granular Soil

2020

QUESTRJ

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Seismic excitations and other lateral dynamic distress cause the structure’s foundation to interact with the superstructure’s response. Consequently, the surplus stress distribution takes place. This disturbance in the lateral stiffness of the system can cause un-satisfaction with the adopted code provisions. In the above scenario, soil structure interaction of the Moment Resisting Frames (MRFs) becomes very crucial. This article deals with soil stiffness on the long-span MRFs designed with two modern building codes, namely Saudi Building Code (based on American Standards) and Eurocodes. High and medium ductility with parameter and spatial frame configurations are considered in this study. Each frame is analysed considering the foundation stiffness, calculated based on FEMA recommendations. Hence, a total of 18 cases are examined, conducting a modal response spectrum analysis. The period, top displacements, reactions, and damageability criterion for the analyzed frames are compared. It is shown that the consideration of SSI (Soil Structure Interaction) is paramount for frames with such spans, especially when subjected to high seismic forces.

Section: Considered Casesmentioning

confidence: 99%

Effects of Soil on the Seismic Design of Long Span Steel Frames Using Contemporary Building Codes

Naqash

2020

QUESTRJ

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“…The numerical investigations on shallow building foundations in Al Madinah province of Saudi Arabia reveal higher settlement with rainfall infiltration [8]. The seismic analysis of steel buildings performed, considering Saudi building code provisions and loose granular soil shows the effect of soil-structure interaction on fundamental period and top building displacement [9]. Experimental investigations on cohesive soils of north Jeddah show a higher possibility of settlement swell potential [10].…”

Section: Introductionmentioning

confidence: 99%

Sustainability of Heavily Loaded Raft Foundations on Granular Soils of Arabian Peninsula with Soft Clay Layer

Qureshi

2022

KEM

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Sandy soil formations are widespread around the globe, particularly in the Arabian Peninsula. The Sandy formations were created as a result of long-term geological activities including but not limited to alluvial and wind deposition. Since the alluvial deposits contain fine soils, the clay layers are often intercepted in the foundation supporting strata. The geotechnical foundation design based on field and lab investigations usually relies on the average response of the layered strata and can satisfy both shear and settlement criteria. However, the enduring sustainability of the heavily loaded foundations is required to be investigated in detail. In this study FEM based numerical investigations have been carried out on a thin raft foundation resting on granular soil, with a soft clay layer in the influence zone. The COMSOL Multi-physics platform has been used for the analysis. The study cases are planned based on the thickness of the clay layer and building load. The analysis results predict the risk involved in the sustainability of rafts in terms of the settlement. The field engineers and designers are recommended to consider the risk and plan accordingly

“…The shallow foundations supported by weak soil may cause undesirable distress in the building structure. The circumstances can become worse if there is a seismic activity [6].…”

Section: Introductionmentioning

confidence: 99%

The Appraisal of Hybrid Foundations on Loose Granular Soil of Western Saudi Arabia

Proc. eng. technol. innov.

Shaath

2020

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Western Saudi Arabia is the most important geographic location for the Islamic world. Millions of pilgrims annually visit the region. To accommodate this huge number of pilgrims, various tall buildings are constructed, yet there is a need for many more. The demolition of old buildings is also in progress. The soil supporting of the foundations mostly comprises sand with varying relative density. Most of the buildings are supported by conventional foundations, which require deep excavation for low relative densities. The combinations of pile and raft or hybrid foundations have been effectively used in tall buildings around the globe. In this research, COMSOL Multiphysics FEM analysis has been adopted to investigate the performance of a hybrid foundations with different pile combinations supported on loose granular soil. The results reflect the effective utilization of the hybrid foundation on loose sand. The arrangement of piles in the foundation system can affect the economy and safety of the structure.