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
Laminated composites are one of the evolving materials in the field of civil engineering construction materials. The main focus of this study is to perform free vibrational analysis of laminated composite conoidal shells. The formulation is done using six node linear strain triangle elements. Finite element coding is done using ForTran to form the global stiffness matrix and global mass matrix. The non-dimensional fundamental frequencies and corresponding mode shapes are determined using Matlab®. Several problem cases with different boundary conditions, varying the geometry curvature ratios' and several types of laminae were used to conduct this study. The results are then compared with those given in the literature. The non-dimensional fundamental frequencies obtained using six node linear strain triangle element are in good agreement with those given in the literature using eight node quadrilateral elements. The fundamental frequency increases with the increase in the number of constraints and the case of lamina 45/-45/45/-45 gave the highest frequency for most of the boundary conditions.
Base isolation is a broadly accepted and used technique to protect structures against ground motions. In this research, TFPS (Triple Friction Pendulum System) is used to isolate Cable Stayed Bridge with length of 2000 ft. The aim of this research is to find out behaviour of cable stayed bridge under triaxial ground motions. Generally, effect of only uniaxial earthquakes are considered, but structures should also be stable when triaxial earthquakes hits the structure. If structure is stable in triaxial motions then it must be stable in uniaxial and biaxial ground motions. Uniaxial, biaxial, and triaxial Earthquake ground motions are applied to the bridge and time history analysis of two different ground motions is carried out. The behaviour of bridge undertriaxial ground motions are evaluated in SAP2000 software. Results of base-shear, bearing displacement, hysteresis behaviour, top of pylon displacement, and deck acceleration are compared after carrying out the analysis. Base shear was found highest in triaxial ground motions than uniaxial and biaxial ground motions.
Self-Compacting Concrete (SCC) has been used widely nowadays and it is more prone to plastic and drying shrinkage cracks. Under impact loading, the micro-cracks present in the concrete may propagate, widen and lead to failure of concrete structures. Researches on Fibre Reinforced Concrete (FRC) has been proven to be effective in improving the impact strength of concrete. So, in this study, an attempt has been made to study the behaviour of Quaternary Blended Self-Compacting Concrete (QBSCC) under impact, with crimped steel fibres. The binder comprises of 40% cement, 10% microsilica, 25% flyash, and 25% GGBFS. Two w/b ratios of 0.3 and 0.4 with super-plasticiser of 1.8% and 1.6% by weight of binder, respectively were used. Crimped steel fibre content of 0, 0.5, 1, 1.5% by weight of binder was used. The impact strength in terms of number of blows were determined using pendulum type impact testing machine for QBSCC beams at 28, 90, and 180 days. QBSCC with crimped steel fibres exhibited better impact resistance than reference concrete without steel. Also, impact strength of QBSCC increased as percentage of steel fibres increased. Maximum impact strength of QBSCC was obtained with 1.5% of steel fibres.
Carbon Dioxide (CO2) is a byproduct of cement manufacturing process. It is produced in huge quantities while manufacturing Ordinary Portland Cement (OPC). Production of Ordinary Portland Cement Concrete (OPCC) utilizes large quantities of energy and natural resources. Geopolymer Concrete (GPC) came as an alternative to Ordinary Portland Cement Concrete (OPCC). In the present work, silica fume has been used as a replacement to Ground Granulated Blast Furnace Slag (GGBS). This study mainly presents the mix design steps and the mechanical properties of the GPC. The mix design proportions for the GPC were based on trial and error. GGBS from the mix proportions was replaced with Silica Fume in the percentages of 20%, 40%, 50%, 60%, 80%, and 100%. The mechanical properties like compressive strength, split tensile strength, flexural rigidity, and modulus of elasticity were studied for all the replacements. It was shown that the specimens with only GGBS as source material are high in strength. It was observed that the properties like compressive strength, split tensile strength, flexural strength showed a significant reduction with the increase in silica fume quantity. A delay in the setting time of GPC was observed with the increase in Silica Fume content.
In a view of increasing vehicular bomb explosion of any kind, nearby buildings results in dynamic loads, which may be greater than originally designed loads. However, accidental events such as explosions in storage facilities, gas explosions, or explosion at quarries also occur from time to time. An explosion may lead to catastrophic damage on the buildings’ external and internal frames depending on the occurrence of the blast (within or immediately nearby buildings). Hence efforts have been made during the last few years for developing the analysis and design of blast resistant structure. Hence for adequacy of blast loading, IS 4991-1968 is used for calculating scaled distances. The studies were conducted on the behaviour of columns subjected to blast loads using Carbon Fibre Reinforced polymer wraps. The column of size 300 mm X 300 mm with 3000 mm long, and 25 mm diameter longitudinal bars of 8 numbers along with 10 mm diameter transverse bars has been considered in the study. The LS-Dyna software tool has been used to evaluate the outcomes of Carbon Fiber Reinforced Polymer (CFRP) wraps on columns performance of the building towards the explosion. It is found that increasing the number of layers of CFRP wraps increase the shear resistance beneath blast load. The CFRP wraps confirmed more resistance to blasting by decreasing the cracks, deflection, and also surface damage of column.
Self-Compacting Concrete (SCC) is a form of special concrete that offers economic and technical benefits over normal concrete. In recent years, application of SCC is increasing in various precast and ready-mix industry. SCC in fresh state, consolidated by its own weight even in the presence of congestion of reinforcement while maintaining homogeneity. Most of the mix proportioning methods suggest a robust mix-design method, which is different from the mix design of normal concrete. In the present study, an experimental work was carried out in order to develop 6 different SCC mixes, three each by using modified Indian Standard (IS:10262-2009) method and volume fraction method. Three different volumes of paste (Vp) (0.33, 0.35, and 0.37) with water contents (195, 205, and 215 lt/m3) and different cement contents along with GGBS as filler was used. The results indicate that the compressive strength of SCC increases with paste content for the same w/c ratio in both mix design methods. The existence of optimal value of Vp was observed, which was independent of the water content, indicating the importance of Vp along with w/c ratio in the mix design. The SCC mixes developed by volume fraction method showed better performance when compared to mix design developed by modified IS method.
Black cotton soil that occupies nearly 20% of the area in India is a problematic soil. It is also called expansive soil or swelling soil, which have the tendency to increase in volume when water is present and decrease in volume when water is removed. The volume change may cause many problems in under construction structures. In India, the area covering the expansive soil is nearly 20% of the total area and includes almost the western Madhya Pradesh, parts of Rajasthan, Bundelkhand region in Uttar Pradesh and parts of Andhra Pradesh, Telangana and Karnataka. The swelling soil of India are commonly known by the name black cotton soil because of their color and for growing cotton. Annually waste of million tons are produced across the country, which leads to disposal problem as well as adds to health risks. Utilization of such industrial wastes and their subsidiary products as alternatives to construction materials may contribute to preservation of environmental and minimize their adverse effects on environment. In this present study, crumb rubber is used as the waste to combine with the soil so that the properties of black cotton soil were investigated in with addition of alccofine. The physical and index properties of soil which were already measured were compared with those of the experimental specimens (crumb rubber and alccofine).
