Free Vibration Analysis of Laminated Composite Conoidal Shells Using Six Node Linear Strain Triangle Elements
Seismic Response of Cable Stayed Bridge Isolated with TFPS under Triaxial Earthquake Ground Motions
Impact Strength of Quaternary Blended Self-Compacting Concrete (QBSCC)
Study on the Mechanical Properties of GGBS Based Geopolymer Concrete Using Silica Fume as a Partial Replacement
Behaviour of Carbon Fiber Reinforced Polymer Wraps to Explosion Loading
Comparative Studies on Fresh and Compressive Strength Properties of Self- Compacting Concrete (SCC) by Modified is 10262-2009 Method and Volume Fraction Method
Effect of Crumb Rubber Powder and Alccofine on Properties of Regur Soil
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
A Step by Step Procedure to Perform Isogeometric Analysis of Beam and Bar Problems in Civil Engineering Including Sizing Optimisation of a Beam
Effect of Suspension to Main Span Ratio on the Behaviour of Cable-Stayed Suspension Hybrid Bridge
Influence of VSI Aggregates on Properties of Pervious Concrete
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 Relative Stiffness of Beam and Column on the Shear Lag Phenomenon in Tubular Buildings
Effect of Symmetrical Floor Plan Shapes with Re-Entrant Corners on Seismic Behavior of RC Buildings
In any structure, beam column joints are the most critical element, when it is subjected to earthquake loading, but in most of the construction works beam column joints are not designed. Therefore, in earthquake prone area the failure of structure occurred due to beam column joint effect. Hence, it is very essential to design any structure by considering the effect of beam column joint. The aim of this work is to improve the strength of beam column joint and its ductile behavior. In this research work, seismic behavior of various types of joints like exterior, interior and corner were studied by using finite element software ANSYS. Numerical analysis is carried out using ANSYS software. Beam column joints are designed as per IS 13920- 2016. The most important factors affecting the shear capacity of exterior RC beam-column joints are concrete compressive strength, the joint aspect ratio of the joints and number of lateral ties inside the joint. Behaviour of beam column joint with beam weak in flexure and observed stresses in joints also studied. It is observed that exterior joints are more affected as compared to other type of joint by considering the effect of stress.
In the last few years, the tall, proportioned and irregular structure exhibits more risks during earthquakes. This happens mainly due to seismic influence and local field response, which get transfer to the structure and vice versa. This can be clarified by the soil structure interaction and infill strut panel analysis. In this paper, G+3 and G+7 storey buildings with the isolated foundation system are considered for analysis. The soil model assumed homogenous three diverse soil strata. The reaction of the structure in terms of Soil Structure Interaction (SSI) parameters underneath dynamic loading for wellknown foundation systems and provided infill strut panel to the structure has been considered and evaluated the soil structure interaction. A relative and parametric study is conceded out with the help of joint displacement, axial force, maximum bending moment, shear force, fundamental time period, etc.
Pile foundations are the most popular form of deep foundations used for onshore and offshore structures. They are often used to transfer large loads from superstructures in to deeper competent soil layers, particularly when the structure is to be located on shallow weak soil layers. The main objective of this investigation is to study the pile model behavior under lateral load in homogeneous soils and investigate the results using Finite Element Analysis (FEA). A Finite Element Analysis based on mathematical code developed in commercial software MATLAB to find out the maximum deflection and bending moment of pile under different operating conditions. The heavy duty PVC pipe material is considered for the model pile while different soils viz. sand and Black Cotton (BC) soil are used with different subgrade modulus present within the range. A single hollow pile of 24 mm outside diameter with thickness of 2.3 mm is considered for the analysis. The length of the pile varies between 720 mm to 912 mm with an eccentricity of 61 mm from the ground level. Afterwards, the study is further extended with the parametric study under different operating conditions. Effect of length of the pile, diameter of the pile, lateral load and the soil subgrade reaction has been analyzed. The results found that, there is the increase in deflection for lower diameter, lower length, and lower subgrade reaction, whereas the increase in bending moment for higher diameter, higher length and lower subgrade reaction of the soil, respectively.
In the present study, an attempt has been made to investigate compressive strength of Pervious Concrete (PC) made with different combinations of aggregate sizes (20 mm, 12.5 mm and 10 mm) and fly-ash (class-F). Four combinations of aggregate namely A1 (50% of 20 mm, 20% of 12.5 mm and 30% of 10 mm); A2 (60% of 20 mm, 20% of 12.5 mm and 20% of 10 mm); A3 (40% of 20mm, 30% of 12.5 mm and 30% of 10 mm) and A4 (20% of 20 mm, 40% of 12.5 mm and 40% of 10 mm) are considered where as fly-ash for replacement of cement by weight is considered as FC1 (10% of flyash); FC2 (20% of fly ash); FC3 (25% fly ash); FC4 (30% fly ash). The basic physical properties of the various ingredients of PC are determined in the laboratory and they are within the limits as per Indian Standard code of practice. The water binder ratio is considered as 0.35. The maximum cement content is considered as 450 kg/m3 . Standard cube specimens (150 mm x 150 mm x 150 mm) are used for determining compressive strength. The total number of cubes casted for all combinations are 48. The compressive strength values obtained for various combinations are in the range of 3.7 MPa to 11.11 MPa. A1 combination of aggregate is showing higher rates of strength when compared to other combinations and at 30% of fly-ash replacement have higher strength of the magnitude 11.11 MPa.
Laminated composite shells are used as roofing units in Civil Engineering applications and hypar shells are most popular because of their ease of construction and aesthetic elegance. The aim of the present study is to analyse higher mode free vibration of composite hypar shells. The purpose is to obtain some design guidelines for the practising engineers dealing with such structures. The methodology adopted here is the finite element method based on first order shear deformation theory. Effect of cross curvature is included in the formulation. The isoparametric finite element consists of eight nodes with five degrees of freedom per node is considered. Three noded beam elements with four degrees of freedom per node are used for stiffeners. The generalised Eigen value solution is chosen for the un-damped free vibration analysis. The formulation is validated first by solving standard problems from literature and then new results are obtained for varying boundary conditions, ply orientation and curvature of the shell. The first five modes of natural frequency are presented. In general, it is observed that fundamental frequency increases with the increase in the number of support constraints. There are, however, few departures from this general tendency when two shells of different laminations are compared. Sometimes lamination order may influence the frequency of stiffened composite shell with cut-out more significantly than its boundary conditions. Symmetric lamination exhibits reasonably good performance and may be adopted for all practical purposes.
The trends and demands of lighter and slenderer high-rise building structures are subjected to p-delta effects, most of the existing high-rise buildings damaged due to the past severe earthquakes. To keep these things into consideration, it is necessary to analyse the structures with some advanced analysis procedures and to develop the new methods of analysis to protect the structures from future severe earthquakes. The objective of this research work is to analyse the structure critically and make them stronger during earthquake and it should result in less damage even during the strong earthquake. In the present work the analysis of G+30 building is being done by adopting the various approach of p-delta analysis. In this research work a symmetrical regular reinforced concrete building frame is analyzed statically and dynamically as per IS 1893:2002 (BIS, 2002). The structure is analysed for seismic zone III and V. Seismic Evaluation is performed on same modal for including P-Delta effects. In the first part, analysis is done without considering the P-Delta effect and in the second part P-Delta effect is considered. The results are compared for Static, Dynamic, and P-Delta analysis.