MIT-World Peace University (MIT-WPU) is a top educational institute located in Pune, India. It is recognized within&nbsp;UGC under Government of Maharashtra Act No. XXXV 2017.&nbsp;

It is part of the MIT group of institutions (established in 1983) which covers 10+ campuses across India and has more than 50,000+ students enrolled across various disciplines at a given point of time. The institute houses 15 schools ranging from Engineering &amp; Technology, Design, Pharmacy, Commerce, Governance among others. It offers undergraduate, postgraduate and PhD programs among different disciplines.&nbsp;

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MIT World Peace University

School of Civil Engineering

Engineering and Technology

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Innovative infrastructure solutions

Performance of linear and nonlinear damper connected buildings under blast and seismic excitations

Post-earthquake utilities of liquid storage tanks do not need any over emphasis. Liquid storage tanks used in public water distribution system provide water for firefighting and also for drinking and household purposes. Tanks used in industry are equally critical as they contain hazardous liquids and their leakage may lead to catastrophic situation. Thus, seismic safety of liquid storage tanks, which are life line structures, is very important. The prime aim of the present work is to review the sloshing phenomenon studied by various researchers in the past. The study is broadly divided into two parts namely tanks without obstruction and tanks with obstruction and its effects on sloshing parameters. A brief review on sloshing problem in complex tank geometries in form of Intze, elliptical and conical tanks is also presented. The study also presents an overview and development of mathematical formulations to predict the sloshing parameters in form of sloshing frequency, convective mass excited and hydrodynamic pressure profiles which enable present structural engineers in designing earthquake-resistant storage structures. A brief review on modeling circular and rectangular liquid storage tanks using ANSYS software is also presented along with the assumptions and suitable element for modeling. The study also investigates the advantages and disadvantages of the different analysis methods available in the finite element program (ANSYS) to obtain the sloshing parameters. The study concludes that an optimum mesh size as detailed in the present study must be evaluated to determine slosh parameters. An arbitrary fine mesh results in a limited number of modes extracted from the finite element analysis and further gives inaccurate solutions. © 2021, Springer Nature Switzerland AG.

Innovative Infrastructure Solutions

An approach to finite element modeling of liquid storage tanks in ANSYS: A review

PurposeThe paper is an attempt to evaluate the efficiency of passive control techniques such as base isolation system (e.g. Lead/Rubber Bearing) and fluid viscous dampers subjected to earthquake ground motions and underground blast-induced vibrations. Two moment-resisting steel frame buildings are analyzed to evaluate the structural responses under dynamic excitations. The effect of vertical irregularity on the performance of passive control techniques in mitigating the responses of the building is also studied.MethodsNon-linear dynamic analysis has been conducted on regular and irregular steel structures. The study investigates the effect of isolation period on the structural responses. The isolators are designed based on the design procedures developed by various researchers. The technical specifications of fluid viscous dampers have been selected from M/s Taylor Devices, USA.ResultsThe structural responses and energy dissipated by these control techniques is evaluated and a comparative study is also carried out amongst control techniques under blast and seismic excitations.ConclusionsBoth the selected passive control techniques have proved to be very effective in reducing the structural responses and forces induced in the building owing to ground-induced vibration.

Journal of Vibration Engineering & Technologies

Performance Evaluation of Moment-Resisting Steel Frame Buildings Under Seismic and Blast-Induced Vibrations

The response reduction efficiency of passive control viscous dampers installed between adjacent structures subjected to blast-induced vibrations was investigated. The blast-induced vibrations studied were mainly due to mining activities along with the accidental explosions in underground storage chambers. Equations of motion formulated by different researchers in examining the performance of damper-connected structures were reviewed. Two different types of structures (similar and dissimilar buildings) were selected to analyse the effectiveness of damper-connected buildings. A parametric study was also conducted to determine the optimum damper placement locations along with optimum damper properties for the similar buildings connected with viscous dampers. The results showed the efficiency of viscous dampers for the case of similar buildings. For dissimilar buildings, the peak responses were found to be almost equivalent for both connected and unconnected structures. Therefore, the root mean square responses were evaluated to compare the effect of blast vibrations beyond the initial impulse for the case of connected dissimilar buildings. In addition, the performance of similar structures connected with the same damping was compared with the responses obtained from different damping conditions to minimise the damping coefficient of dampers.

Proceedings of the Institution of Civil Engineers-Structures and Buildings

Response control of adjacent structuressubjected to blast-induced vibrations

The last few decades have shown a dramatic increase in the number of man-made disaster activities resulting in extensive life loss and structural failures. The explosive devices used in these heinous acts result in blast wave loading. Therefore, the present structural engineers require comprehensive expertise to analyze and design blast-resistant structures. The present study aims to develop blast load time history based on the previous research works and demonstrates the effectiveness of base isolation technique such as lead rubber bearings in mitigating the structural responses under the effect of blast loading. Two base-isolated building models systems are analyzed to examine the role of structural control strategies subjected to blast loading. Various isolation parameters are also incorporated in the present investigation in improving the structural performance subjected to this extreme dynamic loading. The study concludes that base isolation is an efficient technique in reducing structural output parameters such as peak storey displacement, storey drift and root mean square absolute acceleration values due to post-blast effects. Energy-based equations are also examined in the study to evaluate the hysteretic energy dissipated by the system subjected to blast loading.

Arabian Journal for Science and Engineering

Positive-Phase Blast Effects on Base-Isolated Structures

In the present paper, the effect of a centrally placed circular obstruction on sloshing frequency and sloshing mass is studied for annular tanks. Finite element approach (ANSYS software) is used to model the liquid. For circular tanks without obstruction, sloshing frequency and sloshing mass at first three modes are obtained using finite element analysis which compare well with the available analytical results. Next, a rigid circular obstruction at the center of tank is modeled and sloshing frequency and modal mass in the first three modes are obtained. It is observed that with the increase in the diameter of the circular obstruction, the sloshing frequency and the percentage of liquid in sloshing mode decrease in first mode. The behavior of these sloshing parameters in higher modes is also discussed. A detailed study over wide range of circular tank geometries is performed. Charts for obtaining sloshing parameters for various tank geometries are plotted.

Recent Advances in Structural Engineering

Sloshing in Liquid Storage Tanks with Internal Obstructions

In the present paper, passive control technique such as base isolation system is studied under earthquake ground motions and underground blast-induced vibrations. The performance of the lead rubber bearing (LRB), idealized as Bouc–Wen model in mitigating the structural responses of a five-storey building model, is investigated. The earthquake ground motions are selected from ground motion database available on the portal COSMOS Virtual Data Centre, whereas the underground blast is modeled as an exponential decaying function as prescribed by Carvalho and Battista (Proc Inst Civ Eng Struct Build 156(3):243–253, 2003). The aim of the study is to analyze the effect of isolation parameters such as damping ratio, yield strength, post-yield stiffness ratio and yield displacement on the structural responses of the base-isolated building. Newmark’s step-by-step integration method is adopted to evaluate the structural responses of the building. It is observed that the LRB is very effective in reducing the structural accelerations and storey drifts induced in the building due to ground-induced vibration. The comparison of results show that high value of yield strength harvests low bearing displacement and low percentage reduction in the top floor absolute acceleration. In addition, the study also evaluates the energy dissipated by the isolated structure. The energy dissipated by the base-isolated (LRB) building subjected to blast-induced vibrations, show that an optimum value of yield strength is found to be in the range of 10–20% of the total weight of the structure.

Arab J Sci Eng

The Effect of LRB Parameters on Structural Responses for Blastand Seismic Loads

In the present paper, effect of height of building on base shear, lateral forces and storey drift is evaluated by using STAAD software and the results are compared with IS1893 (Part1:2002). For these purpose seismic coefficient method (SCM) specified in IS1893 (Part1:2002) is taken into consideration and results are obtained in STAAD by SCM. The study includes the modeling of two buildings having plan areas 15 m x9 m and 25mx15m and the height is varied from 3m, 6m, 9m and 12m. The study is conducted by varying the geometrical properties of the structure but the seismic properties are kept constant. The buildings are located in zone II region. The results obtained for base shear and other design parameters obtained from STAAD software match with IS1893:2002. Spring mass model with the lateral forces are also plotted for the different buildings. Percentage change in storey shear for the different buildings is also evaluated. It can be observed that as the height and area of building increases the base shear and storey drift increases.