Experimental Study of Shear Failure of Damaged RC Beam Strengthened with GFRP
Antecedents of Variations in Construction Contracts - A Statistical Correlational Study
Dynamic Response of Footbridge Decks
Urban Green Spaces and their Role in Enhancing Quality of Life
Parametric Study on Structural Behaviour of RCC Box Culvert
Study on Strength Properties of Lightweight Expanded Clay Aggregate Concrete
A Step By Step Illustrative Procedure to Perform Isogeometric Analysis and Find the Nodal Displacements for a Two Dimensional Plate Structure
Lateral - Torsional Buckling of Various Steel Trusses
Comparative Study on Methodology of Neo-Deterministic Seismic Hazard Analysis Over DSHA and PSHA
A Step by Step Procedure to Perform Isogeometric Analysis of Beam and Bar Problems in Civil Engineering Including Sizing Optimisation of a Beam
Investigation on the Properties of Non Conventional Bricks
Analysis on Strength and Fly Ash Effect of Roller Compacted Concrete Pavement using M-Sand
Investigation on Pozzolanic Effect of Mineral Admixtures in Roller Compacted Concrete Pavement
Effect of Symmetrical Floor Plan Shapes with Re-Entrant Corners on Seismic Behavior of RC Buildings
Effect of Relative Stiffness of Beam and Column on the Shear Lag Phenomenon in Tubular Buildings
It is essential to inspect and assess any fatigue damage to the components of a structure in order to determine how long it will last. This is necessary for constructions such as concrete bridges, which are subjected to fluctuating loads with high intensity and frequency. This study presents a computer application method for calculating the fatigue life of the Durga flyover (reinforced concrete) bridge. The damage to bridge components can be evaluated based on the dynamics of the interaction between the bridge and vehicles caused by actual traffic. The computer code initially calculates the fluctuation of stresses caused by the passage of various types of vehicles in a given segment of a bridge. The other module has a continuous set of loads to measure the strains and calculate the stress variations across the section components. The rainflow method is used to count stress cycles owing to the fact that the peak intensities of the stress cycles are not steady, and the appropriate S-N curves are utilized to determine the damage caused by each cycle. In this analysis, the stress range amplitude waveform and fatigue toughness characteristics of bridge elements were employed to systematically detect continuous bridge girder fatigue damage. The most severe flexural stresses induced by vehicles were detected, and a stress-range frequency waveform was created while accounting for the total traffic volume. Linear damage accumulation theory was used to calculate the cumulative damage index and bridge fatigue life. The Miner's rule was used to calculate the overall damage caused by the passage of the vehicles. The major factors affecting the fatigue life are the effects of the span, pavement quality, increase in the speed of operation, weight, and suspension characteristics of the bridge.
The selection criteria for outsourcing to execute any specialized work through tenders/bids by any executing agency have been used for the development of public infrastructure projects. The procurement procedures for road development throughout India for public infrastructure and selection were performed by the Lowest-Cost Bidder (LCB). The cost factor is a popularly used bidder selection method, in which the one who quotes the least cost will obtain the project. Various studies have been conducted to determine the causes of failure, delay, substandard work, poor quality, etc., on the performance of selected lowest-bidder-executed projects. To enhance the existing bidding selection procedure and eliminate the causes of failure caused by the existing bid selection procedures, a revised and improved procurement procedure known as Quality and Cost-Based Selection (QCBS) is currently being adopted. This study analyzes the bid selection procedure under various contract modes to reduce the risk of failure and improve the work quality of the road infrastructure in India. New guidelines in public procurement process over existing rules and procedures are emphasized by the Government of India by involving stakeholders, regulating authority, financing institutions, Ministry and Departments considering work quality.
Several materials are being used in concrete as a replacement to coarse aggregates. The present study focuses on experimenting with using Coconut Shell Aggregates (CSA) as replacement to coarse aggregates partially. The high strength and modulus of the coconut shell make it a suitable coarse aggregate for concrete applications. The replacement levels were set at 10%, 15%, and 20%. The experimental results revealed that CSA, when replaced with conventional coarse aggregates, gave satisfactory compressive strength up to 15% replacement, beyond which the strength dropped below the required value. In addition, the use of CSA in concrete significantly reduces the self-weight of concrete, thus contributing to the economy of construction.
Seismic resilience is of paramount importance for the design and construction of structures in earthquake-prone regions. This study aims to provide a comprehensive analysis of the seismic performance of steel-concrete composite and Reinforced Cement Concrete (RCC) structures under dynamic loading, facilitating a comparative assessment of their respective behaviors. The behavior of cement-concrete composite structures, emphasizing the interactions between steel and concrete components, their energy dissipation mechanisms, and their contributions to seismic resistance are explored. This review contributes to the advancement of seismic design guidelines, aiding architects, engineers, and policymakers in making informed decisions regarding safer and more resilient structures.
Road construction projects are complex and dynamic management processes that face many challenges, leading to delays, mainly owing to cost overruns and schedule extensions during the construction phase. Forensic analysis of past project data was examined, and construction project performance was reviewed. This paper presents an analysis of delays in Indian road construction projects under different contract modes. Each contract mode has distinct contractual relationships, risk allocation, and projection-building approaches that influence project execution. To identify the cause of the delay, allocating responsibilities among all project participants' duties and roles under the contract obligation is crucial. Numerous factors can lead to delays, including weather conditions, unforeseen ground conditions, design changes, permit issues, and contractor performance. These delays have a significant impact on project timelines, budgets, and overall project success. This study aims to explore the major factors resulting in project delays and their potential improvements.
