Rehabilitation of a high-rise coupled shear wall system in a 56-storey residential reinforced concrete building (Tehran Tower), based on nonlinear dynamic time-history analyses (original) (raw)
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The Structural Design of Tall and Special Buildings, 2012
In recent decades, shear walls and tube structures have been the most appropriate structural forms for the construction of high-rise concrete buildings. Thus, recent Reinforced Concrete (RC) tall buildings have more complicated structural behaviour than before. Therefore, studying the structural systems and associated behaviour of these types of structures is very important. The main objective of this paper is to study the linear and nonlinear behaviour of one of the tallest RC buildings, a 56-storey structure, located in a high seismic zone in Iran. In this tower, shear wall systems with irregular openings are utilized under both gravity and lateral loads and may result in some especial issues in the behaviour of structural elements such as shear walls and coupling beams. The analytical methodologies and the results obtained in the evaluation of life-safety and collapse prevention of the building are also discussed. The weak zones of the structure based on the results are introduced, and a detailed discussion of some important structural aspects of the high-rise shear wall system with consideration of the concrete time dependency and constructional sequence effects is also included.
Tehran tower is a 56 story reinforced concrete tall building consisting of three wings with identical plan dimensions each approximately 48 meters by 22 meters. The three wings are at 120 degree from each other and have no expansions/seismic Joints. This paper contains the consideration of the retrofitting of the Tehran tower based on the findings of an exhaustive investigation of the nonlinear performance evaluation efforts. It has tried to show the procedure followed, methodologies utilized, and the results obtained for life-safety and collapse-prevention evaluation of the building. More over the weak zones of the structure due to analyses results are introduced and appropriate retrofit techniques for satisfaction related life-safety and collapse-prevention criteria are also presented.
Shock and Vibration, 2010
Inadequate attention during design and construction of some of reinforced concrete (RC) buildings in Cyprus has raised questions about the performance level of these existing buildings under future earthquakes. This study aimed to assess the seismic structural response of a four story existing RC building. For this purpose, first, the weak structural elements (e.g.\ the not safety column-beam joints and weak columns) were detected using linear static procedure (LSP) analyses on the basis of Turkish earthquake code. Then, two different strengthening methods were examined. In the first method which is common in Cyprus, the existing building was strengthened based on LSP, using column jacketing to satisfy seismic code requirements to remove the weak elements. The second strengthening method was carried out using nonlinear static procedures (NSP) to achieve the basic safety objective (BSO) performance level described in FEMA 356. For existing and both strengthened structures, pushover c...
Comparison of Static and Dynamic Analysis of Multi-Storied Building
IJRASET, 2021
Vibration of ground is the main cause of earthquake damage to building structures. There are many factors responsible for the strength of earthquake shaking at a site including the earthquake's magnitude, the site's proximity to the fault, the local geology, and the soil type. The natural disasters have been fast recurring all over the world causing great concern and damage to man and their properties. Among these disasters Earthquake is an endogenous natural disaster, which occurs suddenly without any warning. The vast devastation of engineering systems and facilities during the past earthquakes has exposed serious deficiencies in the prevalent design and construction. Shear wall is one of the most commonly used lateral load resisting in high rise buildings. Shear wall can be used to simultaneously resist large horizontal load and support gravity load. In the study, one tall RCC building of 13 stories is assumed to be situated in seismic zone V is analysed using two methods (Static and Dynamic Analysis). The share walls are taken at different position of building. The comparison of the different shear wall models is studied in this work against the different parameters like time period, bending moment, shear force, storey drift,
Analysis of Multi-Storey Building by Using Coupled Shear Walls
The growth of population and shortage of land in town areas are two major problems for all developing countries. In order to mitigate these two problems, the designer's choice to high-rise buildings, which are rapidly increasing in number, with various architectural configurations and use of structural materials. Due to frequent earthquakes occurring around the world, cause considerable damage to the large number of RCC high-rise buildings. This particular incident has shown that designers and structural engineers should ensure to offer adequate earthquake resistant provisions with regard to planning, design, and detailing in high rise buildings to withstand the effect of an earthquake. As an earthquake resistant system, the use of Coupled shear walls is one of the possible options. Coupled shear walls consist of two shear walls interconnected by beams along their height. In this project natural period base shear, deflection, stiffness, for both static and dynamic analysis is be...
Non-Linear Dynamic Analysis of Earthquake Resistant Reinforced Concrete Building
Ground motion due to earthquake can cause severe damage to the structures thus a threatening to the mankind. In order to take protection against the damage of structures due to strong ground motion, it is important to know its characteristics. The most important and useful dynamic characteristics of an earthquake are peak ground acceleration, frequency and duration. These characteristics play an important role in studying the behavior of buildings under the earthquake ground motion. There are different methods of seismic analysis of building. Among the different methods of seismic analysis of structure time history analysis method is one of the most important method for structural seismic analysis generally when the estimated structural response is nonlinear in nature. In this project I am doing nonlinear dynamic analysis on RC buildings with and without shear wall with different codes. As the IS 1893-2016 is latest revision so to know new provisions this code is taken into consideration. Also, to know the other countries codal provision Eurocode 8 -1998 is also taken into consideration. It is commonly recognized that nonlinear time-history analysis method is the most correct way for simulating response and behavior of structures exposed to strong levels of seismic excitation. There are two methods of analysis one is linear method and second is nonlinear method. In linear and nonlinear analysis there are sub types one is static and another is dynamic. "Nonlinear time history analysis is known for simulating a building behavior under severe earthquake more proper than other methods" .
Bulletin of Earthquake Engineering
Seismic performance of a 253 m tall reinforced concrete core wall building in Istanbul, designed according to performance-based seismic design principles, is assessed for determining the response parameters that control the serviceability, safety and collapse performance limit states. Serviceability performance is evaluated under the 50year wind and 43-year earthquake whereas safety performance is assessed under the 2475-year earthquake. Collapse performance is elaborated through incremental dynamic analysis. Our study revealed that the service performance is controlled by the maximum interstory drift limits specified for wind loads, and safety performance is controlled by the flexural steel strain limits of coupling beams. Collapse occurs in two consecutive stages: flexural collapse of coupling beams, followed by crushing of concrete at critical shear wall segments. Collapse spectra are defined for these two collapse limit states. Collapse spectra can be extrapolated from the 2475-year maximum considered earthquake (MCE) spectrum provided that the prevailing inelastic mechanisms are similar under the MCE and collapse ground motions. The building displays a significantly higher seismic performance at all performance levels, which is primarily attributed to the overstrength due to the limitation of axial stresses on vertical members under design earthquake load combination. The annual frequency of the mean earthquake ground motions that leads to incipient collapse is determined as 8•10-5 , which is significantly lower than the annual frequency of 2475-year ground motions.
Engineering Structures, 2010
This paper is focused on a proposed seismic retrofitting system (PRS) configured to upgrade the performance of seismically vulnerable reinforced concrete (RC) buildings. The PRS is composed of a rectangular steel housing frame with chevron braces and a yielding shear link connected between the braces and the frame. The retrofitting system is installed within the bays of an RC building frame to enhance the stiffness, strength and ductility of the structure. The PRS and a conventional retrofitting system using squat infill shear panels (SISPs) are used in an existing school and an office building. Nonlinear time history analyses of the buildings in the original and retrofitted conditions are conducted for three different seismic performance levels (PLs) to assess the efficiency of the PRS. The analyses results revealed that the building retrofitted with the PRS has a more stable lateral force-deformation behavior with enhanced energy dissipation capability than that of the one retrofitted with SISPs. For immediate occupancy PL, the maximum inter-storey drift of the building retrofitted with the PRS is comparable to that of the one retrofitted with SISPs. But for life safety and collapse prevention PLs, the maximum interstorey drift of the building retrofitted with the PRS is considerably smaller than that of the one retrofitted with SISPs. Furthermore, compared with the building retrofitted with SISPs, the building retrofitted with the PRS experiences significantly less damage due to the more ductile behavior of the system at the life safety and collapse prevention PLs.
Performance Based Seismic Design of Reinforced Concrete Building By Non-Linear Static Analysis
Journal of Advances and Scholarly Researches in Allied Education
Recent earthquake disasters in the world have shown that significant damage can occur even when the buildings are designed to satisfy the codal provisions, thus exposing the inability of the codes to ensure minimum safety of the structures under an earthquake. The displacement-based approach known as the performance-based seismic design (PBSD), which evaluates how building systems are likely to perform under a variety of conditions associated with potential hazard events, is becoming very popular now. In contrast to force-based approaches, PBSD provides a systematic methodology for assessing the seismic performance of a building, thus ensuring life safety and minimum economic losses. PBSD demands the use of non-linear analysis procedures to evaluate the response of structures under lateral loads. The non-linear time history analysis is the most accurate, but requires much computational effort, time and cost. Thus, the use of nonlinear static analysis procedure known as the pushover analysis has been proposed. In pushover analysis, the magnitude of the lateral loads is incrementally increased, maintaining a predefined distribution pattern along the height of the building. It gives an insight on the progressive mode of failure of the structure, thus making it more performancebased. The scope of the present study aims at evaluation of RC buildings designed according to IS 456:2000. The non-linear static pushover analysis procedure has been used in this regard. The non-linear methods can give an Idea regarding the pattern of the plastic hinge formations and thus aid in the performance based seismic design of the structure. The pushover analysis has been carried out using ETABS Softwere. The results of analysis have been compared in terms of base shear, storey drift, storey displacements and plastic hinge rotations. An existing five storeyed residential building was analysed for seismic performance using the dual requirement of life safety under design basis earthquake (DBE) and collapse prevention under maximum considered earthquake (MCE).
Rehabilitation of RC Buildings Using Structural Walls
2000
A developed macroscopic model is applied to the analysis of an example structure to demonstrate the use and advantages of the model. The lateral capacity of a three storeys reinforced concrete (RC) building before and after rehabilitation was assessed using pushover analysis and nonlinear dynamic analysis. The nonlinear dynamic time history analysis was conducted using El Centro record during the Imperial Valley earthquake scaled to different peak ground accelerations (PGA). A rehabilitation technique using structural walls was designed and tested using pushover analysis and nonlinear dynamic analysis with the El Centro record as the ground motion time history input.