Assessment of three-dimensional RC moment-resisting frames under repeated earthquakes

Oggu, Praveen; Gopikrishna, K.

doi:10.1016/j.istruc.2020.03.039

Cited by 23 publications

(4 citation statements)

References 29 publications

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“…The weaknesses in the structural system and deficiencies in the structural steel reinforcement of existing RC buildings have a potential influence on the failure modes, which directly influences the RC building's ability to withstand the loads and remain stable. Seismic vulnerability of a structure is usually expressed as a relationship between intensity measure (spectral displacement, spectral velocity or spectral acceleration) and damage measure (various damage states, viz., slight, moderate, extensive and collapse) [5][6][7][8][9]. The overall methodology for seismic resistance assessment evaluation of existing RC building adopted in this work to withstand seismic loads pertaining to zone III requirements is depicted in Fig.…”

Section: Seismic Resistance Assessment Methodologymentioning

confidence: 99%

Seismic assessment of existing gravity load-designed RC framed building: a case study from Warangal, India

2020

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Most of the existing reinforced concrete (RC) buildings in India are either designed before the existence of seismic design codes or without proper provisions to resist lateral loads. These structures generally possess low strength and limited ductility, thereby always prone to global failure and are a primary reason for causalities during an earthquake. Hence, seismic evaluation of these structures and strengthening, if necessary, is essential to prevent a disaster during its serviceable lifetime. In this investigation, a four-storied (G+3) RC building structure in Warangal city, Telangana State, India, has been selected as a case study. Furthermore, the structure is to be extended vertically by two stories above the existing configuration. The structural and material inputs to the analytical model are updated from visual inspection and nondestructive tests, followed by an analytical study. From the analytical study, the seismic capacity of the existing gravity load-designed structure itself is found to be inadequate for seismic requirements. Since the structure is to be extended vertically, the existing building needs to be strengthened appropriately to withstand additional loads and remain functional throughout its lifetime. The outcome of the seismic analysis is checked for conformity using demand and capacity requirement of the structural components of the six-storied (G+5) structure. This behavior mimics the current scenario of existing RC buildings in this locality, which needs to be appropriately strengthened. It has been observed from the analysis that the RC building was vulnerable to the seismic forces and needed retrofitting to remain functional during its service life.

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Section: Seismic Resistance Assessment Methodologymentioning

confidence: 99%

Seismic assessment of existing gravity load-designed RC framed building: a case study from Warangal, India

2020

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“…Stiffness irregularity-soft storey: Checked when there are variations of stiffness from one floor to another, resulting in a weak floor, which may give rise to mechanisms such as soft storey [17]. The lateral stiffness of buildings is also strongly affected by the presence of setbacks [13,18,19].…”

Section: Structural Irregularities In Elevationmentioning

confidence: 99%

Code Requirements for the Seismic Design of Irregular Elevation RC Structures

Santos,

Melo,

Varum

2024

Buildings

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The recent seismic activity highlights the crucial need to enhance seismic design and safety assessment methods, particularly for irregular structures, in both new and existing constructions. The present study focuses on structural irregularities in elevation for buildings, as the design of structural systems involves multiple variables that often result in irregularities in many buildings. This work aims to perform a comparative assessment of the criteria adopted for the evaluation of the structural irregularities in elevation present in European and international seismic codes. This paper is structured as follows: Firtsly, it discusses structural irregularities and more specifically the most common types of structural damage due to seismic events. Then, it shows the documented experiences of structural damages in seismic events associated with structural irregularities in China, Italy, Spain, Nepal and Mexico. Additionaly, it discusses the requirements of the standards on irregularities and their limitation in that matter. At the end of this section, the different approaches of each code in irregularities in elevation are compared. All assessed seismic codes addresses the structural irregularity issue, attributing the desired characteristics of a seismic-resistant structure. However, there are considerable development differences between norms, demonstrated on ambiguity of few codes on criteria of vertical irregularies.

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“…A study was conducted to investigate the behaviour of ductile RC frames strengthened by introducing partial in lls under cyclic lateral loading (Anıl 2007). The results of this investigation conclude that the collapse capacity of threedimensional RC moment-resisting frames under repeated earthquakes is signi cantly lower than that of the most severe single earthquake (Oggu 2020). A brief review of reinforced concrete buildings' seismic performance evaluation procedure is presented (Taliakula 2015).…”

Section: Introductionmentioning

confidence: 96%

The Behaviours of Square Section Columns Under Earthquake Effect

Kap

2024

Preprint

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92% of Turkey is in the earthquake zone, and 95% of the population lives under earthquake risk. Laws and regulations determine the design and implementation of earthquake-resistant structures. The first earthquake regulation in Turkey was published in 1940. After 1940, a new earthquake regulation was published in 1944, 1949, 1953, 1962, 1968, 1975, 1998, 2007, and finally, in 2018. One of the most important problems seen in reinforced concrete buildings exposed to earthquake effects is the displacement of the floors. The drifts in the buildings vary depending on the stiffness, height, and elasticity modules of the load-bearing elements. In this study, a five-storey reinforced concrete building model was designed using five different column sections according to the 2018 earthquake code. C-30 concrete and S-420 steel were used in the designed building models, and the behaviours of these structures under the influence of earthquakes were analysed. In the analysis, the results of the building model with 35x35 cm columns were taken as a reference. It has been observed that the buildings designed with 40x40, 45x45, 50x50, and 55x55 section columns can carry more earthquake loads at the rates of approximately 104, 113, 128, and 141 tons respectively. At the same time, the displacements on the floors decrease by approximately 31, 47, 55, and 61%, respectively. However, changes in other building models were compared and tested with multiple comparison tests at a 95% confidence interval, and the test results were given in tables.

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Assessment of three-dimensional RC moment-resisting frames under repeated earthquakes

Cited by 23 publications

References 29 publications

Seismic assessment of existing gravity load-designed RC framed building: a case study from Warangal, India

Seismic assessment of existing gravity load-designed RC framed building: a case study from Warangal, India

Code Requirements for the Seismic Design of Irregular Elevation RC Structures

The Behaviours of Square Section Columns Under Earthquake Effect

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