Response of Cylindrical Elevated Wheat Storage Silos to Seismic Loading

el-Rahim, Abd; Hamdy, H A

doi:10.21608/jesaun.2013.114948

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Moreover, a mathematical expression was implemented to predict the lateral and hoop pressures of a flat-bottomed silo exposed to sustained horizontal and vertical accelerations [10]. The seismic behavior of elevated type reinforced concrete silos was evaluated in the initial conditions [11,12] and while silo discharging [13]. Nevertheless, the silo wall rigidity is inspected for silos subjected to ground motions [14] and the response of the ensiled material under earthquakes [15].…”

Section: Nomenclature Cmentioning

confidence: 99%

Seismic Analysis of Reinforced Concrete Silos under Far-Field and Near-Fault Earthquakes

Hussein¹,

Risan²

2022

Structural Durability &Amp; Health Monitoring

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Silos are strategical structures used to stockpile various types of granular materials. They are highly vulnerable to earthquake excitation and have been frequently reported to fail at a higher rate than any other industrial structure. The seismic response of silos within the near-fault region will suffer a complex combination of loadings due to the unique characteristics of the near-fault ground motions; which are usually associated with a large amplitude pulse at the beginning of either the velocity or the displacement time histories. This study aims to numerically evaluate the seismic response of reinforced concrete cylindrical silos under near-fault ground motions (NFGM) and farfield ground motions (FFGM). The assessment investigates the impact of the slenderness ratio and the parameters' influence on the seismic behavior of reinforced concrete silos. The validity of the Eurocode provisions in the structural safety of silos will also be inspected. The nonlinear time history analysis is carried out through the finite element approach by examining four silos with different slenderness ratios. The concrete damage plasticity model is assigned to the silo wall to simulate the nonlinear behavior of concrete in the plastic zone; while, the behavior of the stored material is represented by the Drucker-Prager plastic model. The wall-granular material interaction is considered and defined by coulomb's friction theory. The results of the near-fault records reveal a growth up to 72.8% in the hoop stress and 160.4% in the vertical stress compared to the far-field earthquakes. Consequently, the seismic response of reinforced concrete silos is highly sensitive to the type of ground motion, and slender silos tend to impose greater structural demand under the NFGM. Additionally, The Eurocode-8 seismic provisions were adequate in the conventional far-field ground motions and less effective in the near-fault zone.

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Section: Nomenclature Cmentioning

confidence: 99%

Seismic Analysis of Reinforced Concrete Silos under Far-Field and Near-Fault Earthquakes

Hussein¹,

Risan²

2022

Structural Durability &Amp; Health Monitoring

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Seismic Analysis of RC Clinker Silos

Sharaf¹,

Hassan²,

Ramadan³

2023

EJSE

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This research addresses the nonlinear analysis of flat bottom clinker silos that are typically used to store granular materials. Most of silos’ failure is due to the inefficiency to resist seismic forces. One of the silo failure reasons is that filled granular material is usually treated as a water pressure which is not realistic. Water pressure is linearly distributed, while granular material has a nonlinear distribution along silo height. The main investigated variables were silo width, height, reinforcement ratio, and the existence of opening in the bottom part of the silo wall. Effects of these variables on silos’ dynamic properties - modal periods and mode shapes - as well as seismic response, base shear, base overturning moment, and the least number of modes needed to satisfy mass participation of 90%, were examined. Extensive numerical analyses were conducted to examine these parameters using different types of analyses such as free vibration, response spectrum, and pushover analysis. It was found that increasing height on time-period has a great effect when compared to the effect of diameter increase. Reinforcement ratio in silo without openings has a minor effect in small diameters while it has a major effect in case of silos with large diameters.

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Response the Cylindrical Elevated Wheat Storage Silos to Seismic Loading

Abd-el-rahim¹

2014

IOSRJEN

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The elevated cylindrical storage silos are lifeline structures and strategically very important, since they have vital use in industries. Silos are special structures subjected to many different unconventional loading conditions, which result in unusual failure modes. In addition silos are cantilever structures with the material stacked up very high vertically. The earthquake response of silo structures for the storage of bulk solids differs for elevated silos and silos supported directly on the ground. The walls of different type of silos are subject to earthquake loads from the stored mass, and these may substantially exceed the pressures from filling and discharge. The assessment of horizontal action of ensiled material due to seismic vent seems to be particular interest. This paper is concerned with the earthquake response of these structures, which has received little attention to date. A cylindrical silo wall and bulk solid is modeled by three dimensional finite solid l elements. The interaction effect between the silo wall and bulk solid is taking account by using the nonlinear approach proposed by Duncan and Chang. A then interface layer proposed by Desia is applied to describe the phenomena taking place on the surface between the granular material and silo wall. Coulomb's friction low was used for modeling of wall friction. An incremental iterative finite element technique is applied for dynamic analysis of wheat silos using SAP2000 structural software package. In this research seven reinforced concrete silo models with different height to diameter ratios were studied and analyzed in time history by using earthquake acceleration 0.5g applied to silos models. The resulting finite element silo pressures as the silo is full with and without earthquake excitation are compared with theoretical filling and discharging pressure. The result obtained revealed that the elevated silos response is highly influenced by the earthquake characteristics and is depending on the height to diameter ratio. Also the findings indicate that the squat silo (large diameter and height) are more resistance to the earthquake and more economical. The seismic responses of the elevated wheat silo such as top displacement, normal forces, shearing forces and bending moments in silo support have been assessed for earthquake records.

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Response of Cylindrical Elevated Wheat Storage Silos to Seismic Loading

Cited by 3 publications

References 9 publications

Seismic Analysis of Reinforced Concrete Silos under Far-Field and Near-Fault Earthquakes

Seismic Analysis of Reinforced Concrete Silos under Far-Field and Near-Fault Earthquakes

Seismic Analysis of RC Clinker Silos

Response the Cylindrical Elevated Wheat Storage Silos to Seismic Loading

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