scholarly journals Analysis and Design of Transmission Tower with Isolated Footing

2020 ◽  
pp. 35-42
Keyword(s):  
Soil Structure ◽  
Geographical Location ◽  
Soil Structure Interaction ◽  
Transmission Tower ◽  
Electrical Transmission ◽  
Total Load ◽  
Analysis And Design ◽  
Structure Interaction ◽  
Economical Design ◽  
Interaction Modeling

A transmission tower is a tall structure, usually a steel lattice tower used to support an overhead power line. They are used in high voltage AC and DC systems. Steel tower structure resting on footings are currently becoming popular in any geographical location for electrical transmission, microwave transmission etc. It is necessary to have an understudy of the behavior of such structures and provide an economical design. To understand the performance of such high rise structures, it is necessary to know their behavior considering the soil structure interaction. Modeling of Transmission tower for the validation purpose is done. The basic soil properties of laterite were also found accordingly. Here the entire transmission tower with the isolated footing is modeled and analyzed in STAAD Pro V8i and STAAD Foundation software. The total load transmitted to each tower leg is found using STAAAD Pro and the size of isolated footing under each tower leg is determined using the STAAD Foundation software respectively. If required the soil structure interaction effects (SSI) can also be found easily

scholarly journals Effect of Lateral Loads and Soil Structure Interface on Structural Performance of RCC Chimney

2019 ◽  
Vol 9 (1) ◽  
pp. 2804-2809
Keyword(s):  
Soil Structure ◽  
Soft Soil ◽  
Technical Information ◽  
Regular Structure ◽  
Soil Structure Interaction ◽  
Lateral Loads ◽  
Chemical Waste ◽  
Analysis And Design ◽  
Structure Interaction ◽  
Combustion Gases

Chimneys are distinguished requirements for Power generation and other Manufacturing areas which are vital to be constructed vertically to discharge combustion gases and chemical waste gases to the environment. Due to the hasty growth of mechanization and escalating the requirement to control of Air pollution, the construction of tall Chimneys becomes a regular structure in contemporary circumstances. Tall chimney shells generally designed to resist vertical and lateral loads especially due to the effect of Wind and Earthquake. RCC Chimney shell will transfer these vertical and lateral loads to its foundation system. Soil Structure Interaction (SSI) is the response of soil which impacts the behavior of the structure or behavior of the structure which affects on response of soil. Soil Structure Interaction is essential for tall structures which especially resting on soft soil strata. This review work presents a widespread appraisal of the research presented in the area of RCC chimney and communicates most recent enlightenments and improvements happened in the analysis and design. This paper makes an attempt on focusing the modeling features of RCC chimneys which contains analysis, design aspects and several case studies, with the help of various software programs with the effects of lateral loads and soil structure interaction. The present review paper also corresponds to a complete anthology of the research accomplished on RCC chimney and will gives rationalized technical information for the researchers.

scholarly journals Soil-fluid-structure interaction applied to the Oued Taht dam (taking into account the membrane effect).

2018 ◽  
Vol 149 ◽  
pp. 02037
Author(s):  
Krenich Nasreddine ◽  
Tahar Berrrabah Amina ◽  
Houmadi Youcef ◽  
Belharizi Mohamed ◽  
Mehdeli Mohamed ◽  
...  
Keyword(s):  
Soil Structure ◽  
Fluid Structure Interaction ◽  
Arch Dam ◽  
Soil Structure Interaction ◽  
Constant Thickness ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Membrane Effect ◽  
Interaction Modeling ◽  
Interaction Phenomenon

The objective of this work is to analyze the dynamic behavior (modal behavior) of the "Oued Taht" arch dam located at MASCARA, taking into consideration the effect of soil-fluid-structure interaction. The finite element code "Ansys" was chosen for the dynamic modeling of the dam that is the subject of this study. Three hypotheses were used for soil-structure interaction modeling; model with embedded base which corresponds to the case where the phenomenon of interactions soil-structure is neglected, model with ground of foundation without mass which consists in taking into account the kinematic component of interaction soil structure and neglecting the inertial component and the model with foundation soil with mass where the two components of soil-structure interaction are taken into account. For the fluid, the model of added masses (equivalent to the westergaard approach) using the SURF element available in the Ansys code library was used. A comparison between the different models of the "Oued Taht" dam was made; it has been found that the taking into account of the soil-fluid-structure interaction phenomenon modifies the period of the system and that the modeling of the dam with and without fluid gives a very important difference of the periods. The results obtained were compared with those of the "Brezina" dam, which is a gravity dam located in BAYADH. The work has shown that the periods of the "Oued Taht" dam with soil-fluid-structure interaction modeling are very out of phase with the periods without fluid modeling (taking into account only the soilstructure interaction phenomenon). which is not the case for the Brezina dam where the periods for the two models are getting closer. The periods between the two models mentioned before are close to the dam of Brézina because the latter is a dam which participates much more by its own weight than by its vault (thickness of the vault varies between 36.3 m at the base and 5m in crest) which is the opposite for the dam "Oued Taht" which participates by its vault (constant thickness of 7 m) thus the membrane effect is present, which is translated by the shift of the periods between the empty case and the filled case.

scholarly journals Simplified formulations for the determination of rotational spring constants in rigid spread footings resting on tensionless soil

2017 ◽  
Vol 23 (4) ◽  
pp. 464-474
Author(s):  
Konuralp GİRGİN
Keyword(s):  
Soil Structure ◽  
Soil Structure Interaction ◽  
Biaxial Bending ◽  
Rotational Spring ◽  
Analysis And Design ◽  
Structure Interaction ◽  
Spread Footings ◽  
Spring Constants ◽  
Manual Calculation

In spread footings, the rotational spring constants, which represent the soil-structure interaction, play an important role in the structural analysis and design. To assign the behaviour of soil, which is generally represented via Winkler-type tensionless springs, necessitates time consuming iterative computing procedures in practice. In this study, a straightfor­ward approach is proposed for the soil-structure interaction of rigid spread footings especially subjected to excessive eccentric loading. By considering the uplift of footing, the rotational spring constants of those type footings under axial load and biaxial bending are easily attained through the proposed simplified formulations. Since these formulations enable manual calculation, iterative computer efforts are not required. The formulations under consideration can be applicable to sym­metric and non-symmetric rigid spread footings. The numerical results of this study are verified with SAP2000.

Development of Acceptance Criteria for Soil-Structure Interaction Solutions Using Linear SSI Techniques

2016 ◽  
Author(s):  
Michael C. Costantino ◽  
Thomas W. Houston ◽  
Andrew S. Maham
Keyword(s):  
Peer Review ◽  
Soil Structure ◽  
Large Scale ◽  
Soil Structure Interaction ◽  
Analysis And Design ◽  
Structure Interaction ◽  
Review Team ◽  
High Hazard ◽  
Parametric Analyses ◽  
Benchmark Solutions

Seismic analysis and design of high-hazard nuclear facilities requires evaluation of soil-structure interaction (SSI) effects on structure and soil response due to earthquake ground motions. The industry-wide methodology of computing SSI response of buildings is through linear SSI techniques using the computer code SASSI. Technical issues were identified by users and regulators (Ref. 1) resulting in the U.S. Department of Energy (DOE) commissioning a large scale, multi-year Validation and Verification (V&V) Project for SASSI (Ref. 2). The project was a highly peer reviewed process that included an esteemed Participatory Peer Review Team, DOE oversight, as well as regulatory and stakeholder input. The project goal was to develop benchmark SSI solutions for the range of SSI problems associated with high-hazard facilities within the DOE complex. As per industry software quality control requirements, an acceptance limit for the benchmark solutions must be provided to define the acceptable accuracy of the results produced by SASSI relative to the benchmark. In order to define this limit, variation in the solution of foundation impedance must be related to an expected level of accuracy in structural design quantities of interest (e.g., response spectra, base shear, etc.). Therefore, extensive parametric analyses were performed for coupled soil-structure systems having a broad range of SSI parameters defined by foundation size, soil properties, building stiffness and mass properties, building height, etc. Based on the results of the parametric analyses, ASCE 4 code guidance, and engineering judgment of CJC&A and the peer review team, an acceptable level of accuracy in computed foundation impedance was determined for SASSI solutions. This supported the successful qualification of SASSI for use in two large-scale DOE projects.

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