http://localhost:8081/jspui/handle/123456789/113 Tue, 18 Aug 2026 15:56:39 GMT 2026-08-18T15:56:39Z http://localhost:8081/jspui/handle/123456789/21327 Title: Strain-based Damage Classification of Slender Reinforced Concrete Shear Walls Authors: Sanapureddy, Sudharma Raja Reddy Abstract: This study investigated the behaviour of Reinforced Concrete (RC) shear walls under quasi-cyclic loading. The study's main objective was to comprehend the mechanics of load transfer and the progression of damage in slender, intermediate, and squat shear walls. It aimed to develop equations that relate strain to sectional properties of walls and propose strain limits for different damage states, such as rebar yielding, onset of concrete spalling, and core concrete crushing. Currently, the focus of the work is primarily on slender shear walls. Displacements of slender shear walls under lateral loading is mainly governed by flexural deformations. The fundamental stages of damage in slender shear walls are studied from mechanics of load transfer. The critical damage states of slender shear walls are identified based on residual lateral capacity of wall. For slender RC shear walls, the identified critical damage states are yielding of rebar, spalling of cover concrete, crushing of core concrete, and buckling of longitudinal rebars. Extreme fibre compressive strain is chosen as Engineering Response Parameter (ERP) for unambiguous identification of critical damage states. Available published details of quasi-cyclic experimental testing of slender RC shear walls are used to determine values of compressive strains at critical damage states. The published literature reported displacement values at occurrence of some of the critical damage states. Extensive literature survey is done to gather the experimental data of shear walls under cyclic loads. Experimental data of twenty-four planar slender RC shear walls is reported displacement corresponding at least one of the critical damage states. These published experimental force-displacement relationships are analytically reproduced to determine extreme fiber compressive strains at critical damage states. Thu, 01 Jun 2023 00:00:00 GMT http://localhost:8081/jspui/handle/123456789/21327 2023-06-01T00:00:00Z http://localhost:8081/jspui/handle/123456789/21105 Title: Time-Frequency Analysis Of Accelerogram Authors: Maitra, Satyajit Abstract: In signal processing, time-frequency analysis consists of studying a signal in time and frequency domains simultaneously. Rather than viewing a 1-dimensional signal (a function, real or complex-valued, whose domain is the real line) and some transform (another function whose domain is the real line, obtained from the original via some transform), time-frequency analysis studies a two-dimensional signal– a function whose domain is the two-dimensional real plane, obtained from the signal via a time-frequency transform. These high-level representations such as time-frequency maps convey a wealth of useful information, but they involve a large number of parameters that make statistical investigations of many signals difficult at present. In this paper, we will describe a method that performs a drastic reduction in the complexity of time-frequency representations through modeling of the maps by elementary functions, Artificial Intelligence, and Machine learning. The method is validated on artificial signals and subsequently applied to signals recorded at original stations. We will show different methods of doing Time-frequency analysis using techniques like FFT(Fast Fourier Transform), wavelet methods, and how by applying Artificial neural networks, deep learning can significantly reduce the complexity of time-frequency analysis with more return in result. We will try to validate the advanced technological improvement in this field to show the potential and promise of technology in this area. Tue, 01 Jun 2021 00:00:00 GMT http://localhost:8081/jspui/handle/123456789/21105 2021-06-01T00:00:00Z http://localhost:8081/jspui/handle/123456789/21104 Title: Risk Targeted Seismic Design of RC Frame Buildings Authors: Singh, Devendra Abstract: The Design criteria specified in Seismic codes implicitly explains the performance objectives and non-linear response of buildings through response. The Response reduction factor is used to reduce the design forces in structure to incorporate non-linear behaviour and capacity in post yield region. The focus of present study is to determine values of performance factors and compare these values with the suggested values from different seismic codes. Risk targeted seismic design utilizes the probabilistic framework to acquire risk levels within the desired limits iteratively. The methodology of probabilistic framework to quantify the seismic performance factor of RC moment-resisting frame is adopted. The non-linear analyses are performed using 22 ground motion sets on 3 RC frame buildings located in seismic zone IV of IS 1893 (2016). The detailed modelling of low and mid-rise buildings is done as per the Indian seismic standards. Validation of analytical modelling at member and global response level are carried out to eliminate propagation of modelling errors in the total uncertainty. The effects of timer period on available response reduction factor, conditional probability of collapse and the annual rate of collapse exceedance have been studied. It has been found that designing RC moment-resisting frame building for the higher time period does not reduce available response reduction neither increases the annual rate of collapse exceedance when other codal provisions, such as capacity design, and Strong column weak beam are followed. Tue, 01 Jun 2021 00:00:00 GMT http://localhost:8081/jspui/handle/123456789/21104 2021-06-01T00:00:00Z http://localhost:8081/jspui/handle/123456789/21103 Title: Seismic Evaluation of Existing Buildings Authors: Thakuria, Alakesh Abstract: Open ground storey buildings are commonly provided in India since they provide much-needed parking space in an urban environment. These buildings are observed to be the most vulnerable type of vertically irregular buildings. NCT Delhi has been chosen as the area of study due to availability of microzonation study. Most of the buildings in Delhi are open ground storey. The Model Building Bye-Laws 2016 of Delhi direct plot owners to accommodate all vehicles inside the plot area in order to avoid traffic congestion on the road. FAR norms are relaxed for buildings with stilt parking. So owners opt for it. Again some buildings are designed for only gravity loads. Delhi lies in Seismic Zone IV of the Seismic Zoning Map of India. But as per microzonation study conducted, different parts are assigned different zones from III, IV, V based on their PGA values. Few sites have even more PGA than that assigned to zone V. Delhi lies in a region liable to moderate damages. Earthquake occurring in Himalayas also affect Delhi. The project aims to find the vulnerability of various types of buildings with different storeys, bays, etc. in various parts of Delhi. Vulnerability assessment of two G+4 storied buildings having different plan dimensions, both located in Wazirabad, have been taken up. Fragility curve of the buildings are obtained using Incremental Dynamic Analysis. Hazard curve is plotted for the selected site in Delhi. Collapse risk is estimated for the buildings by convoluting fragility curves and site specific hazard curve. Tue, 01 Jun 2021 00:00:00 GMT http://localhost:8081/jspui/handle/123456789/21103 2021-06-01T00:00:00Z