The main purpose of this present work is to study the seismic performance of empty elevated tanks as a framed rectangular and a framed circular tanks structures subjected to 11 earthquake ground motions, soil type as site class B, considering the effect of lateral or earthquake forces. Non-linear dynamic (Time History) analysis was conducted to estimate the earthquake responses of the systems. The seismic response of the elevated rectangular and elevated circular tank models with the same number of stories and height and with the same tank plan areas, considering the same 11 real earthquake records from the Pacific Earthquake Engineering Research (PEER) ground motion database canter, are discussed in the paper. The analyses of elevated rectangular and elevated circular tanks are carried out with the help of finite element software ETABS, V19. Dead load, live load, wind load and seismic loads are applied based on ASCE-7-16 and ACI-318-19 codes.
Table of Contents
1. INTRODUCTION
2. OBJECTIVES OF THE STUDY
3. METHODOLOGY
4. RESULTS AND DISCUSSION
5. CONCLUSIONS
Research Objectives and Topics
The academic paper evaluates and compares the seismic performance of empty rectangular and circular elevated reinforced concrete water tanks. By utilizing ETABS software, the study investigates structural behavior under 11 different earthquake ground motions, specifically focusing on lateral force effects, displacement, and stiffness characteristics to determine which tank geometry offers superior structural reliability during seismic events.
- Finite element modeling and design of rectangular and circular elevated water tanks.
- Comparative analysis of seismic performance using Nonlinear Dynamic (Time History) analysis.
- Assessment of critical structural parameters including story drift, base shear, and structural stiffness.
- Evaluation of hydrodynamic response using ASCE-7-16 and ACI-318-19 regulatory standards.
Excerpt from the Book
3. METHODOLOGY
The present work is carried out to study the earthquake performance of rectangular and circular elevated concrete buildings tanks models. The buildings are designed and analysed in ETABS software. The models considered are:
1) Rectangular water tank
2) Circular water tank
The Nonlinear dynamic (Time History) analysis is adopted for seismic evaluation of the tanks, as per the ASCE-7-16, and ACI-318-19 codes. The following is a description of the steps involved in modelling and analysing evaluation of both elevated water tanks.
Modelling
ETABS software is used to model and analyse water tanks, both rectangular and circular. The following tables and figures demonstrate the plan dimension and properties for the rectangular and circular elevated water tanks respectively. The succeeding steps have been considered.
Step -1: Defining the material and section properties
The material properties and section properties should be defined for the water tank modelling. Table 2.0 and Table 3.0 shows the details of the material properties.
Step-2: Assigning the material and section property
After defining the both properties, the properties are assigned for the structures.
Step-3: Defining load patterns
The various loads acting on structure are dead load, live load, wind load, earthquake load or seismic load and water pressure these loads are defined.
Summary of Chapters
1. INTRODUCTION: Discusses the necessity of elevated water tanks for urban infrastructure and the imperative requirement for these structures to remain functional during and after seismic activity.
2. OBJECTIVES OF THE STUDY: Defines the research intent, specifically the comparative simulation of rectangular and circular tanks using finite element analysis to identify differences in seismic responsiveness.
3. METHODOLOGY: Outlines the technical workflow, including structural modeling in ETABS, implementation of load patterns, and the application of non-linear dynamic analysis according to international building codes.
4. RESULTS AND DISCUSSION: Details the empirical data gathered from the analysis, covering base shear, story drift, displacement, stiffness, and internal forces (bending, shear, and axial).
5. CONCLUSIONS: Summarizes the comparative findings, concluding that rectangular tanks exhibit higher stiffness while circular tanks display specific variations in internal force distribution and flexibility.
Keywords
Elevated water tank, rectangular tank, circular tank, nonlinear dynamic analysis, time history analysis, seismic performance, base shear, seismic weight, story drift, structural stiffness, displacement, concrete reinforcement, ETABS, earthquake ground motions, structural modeling.
Frequently Asked Questions
What is the fundamental scope of this research paper?
This paper examines the seismic resilience and structural behavior of elevated rectangular and circular reinforced concrete water tanks when subjected to real earthquake ground motion data.
What are the primary thematic areas covered?
The study covers structural design, finite element modeling, seismic load integration, and the comparative analysis of geometric influences on tank safety during tremors.
What is the central research question?
The study aims to determine how different tank shapes (rectangular vs. circular) impact the overall seismic performance and structural stability of elevated water storage systems.
Which scientific methodology is employed?
The researchers utilized Non-linear dynamic (Time History) analysis within the ETABS software environment, adhering to ASCE-7-16 and ACI-318-19 design standards.
What topics are addressed in the main analysis section?
The main part analyzes structural parameters such as base shear, story displacement, drift ratios, natural period, modal shapes, and the resulting shear and bending moments.
Which keywords define this work?
Key identifiers include elevated water tanks, seismic performance, nonlinear dynamic analysis, base shear, and structural stiffness.
Did the study conclude that one tank design is superior in terms of stiffness?
Yes, the study indicates that the rectangular water tank structure exhibits higher base shear, making it stiffer compared to the circular water tank model.
How did the axial force results differ between the two designs?
The analysis revealed that the axial force is greater in circular elevated water tanks compared to their rectangular counterparts.
- Quote paper
- Anonym (Author), 2023, Study of RC Elevated Tanks Subjected to Earthquake Ground Motions, Munich, GRIN Verlag, https://www.hausarbeiten.de/document/1458864
