Informatics Publishing Limited

N. Parthasarathi ¹, B. M. Ramalinga Reddy ², K. S. Satyanarayanan ¹

Affiliations
1 Department of Civil Engineering, SRM University, Chennai - 603203, Tamil Nadu, IN
2 Structural Engineering, SRM University, Chennai - 603203, Tamil Nadu, IN

Abstract

Objective: Availability of fine aggregates in its natural form is becoming very scarce. It is becoming a challenging task to meet the demand for fine aggregates in its natural form without exploiting the natural resources. To sustain the construction activity, it becomes very essential to explore the possibility of utilizing alternative materials for fine aggregates. Large quantity of inorganic industrial waste is generated annually. Coal mine wastes, blast furnaces lag, iron ore tailings, red mud, zinc tailings, goldmine tailings etc., are some of the inorganic waste products that are generated. Methods/Statistical Analysis: In this investigation, an attempt is made to replace partially naturals and with gold mine tailings and study the behavior of concrete in the green state. Mix proportion for M25 concrete was obtained as per IS: 10262 guidelines, for normal concrete and concrete containing gold mine tailings as fine aggregates. Findings: Natural fine aggregates were replaced with 10%, 20% and 30% goldmine tailings on weight basis. In all five mixes were obtained and workability studies in the form of slump and compaction factor test were carried out. The slump for normal concrete was 84.33 mm and that for concrete containing gold mine tailings was 16.33 mm. The low slump for concrete containing gold mine tailings alone may be attributed to the presence of fine particles. The slump values for 10%, 20% and 30% replacement levels are 63.6 mm, 44.33 mm and 22.6mm respectively. Similar behavior is observed in the case of compaction factor test also. The decrease in the workability of concrete may be attributed to the increase in the fineness of resulting fine aggregates. Applications/ Improvements: The application of the gold mine tailing in the high scale structures and reduce cement by GMT.

Keywords

Compaction Factor, Concrete Mix, Gold Mine Tailings, Slump.

Full Text

   

N. Parthasarathi ¹, K. S. Satyanarayanan ¹, M. Prakash ¹, Sunumol Sulaiman ¹

Affiliations
1 Department of Civil Engineering, SRM University, Kattankulanthur, Tamil Nadu, IN

Abstract

Objective: To study and compare the behaviour of half-cuboctahedron grid and hexagonal grid tensegrity system. Methods/ Statistical Analysis: Ever since the discovery of tensegrity, most works have been concentrated on the classification and form finding techniques but very less on the mechanics of these structures. This study focus on the behaviour of two basic tensegrity modules, the half-cuboctahedron and hexagonal. Findings: Later, the study has been extended to tensegrity grids of spans 2x2, 4x4 and 8x8 of both the configurations (hexagonal modules and half-cuboctahedron modules) which were developed using an FEM based software. The grids were compared on the basis of nodal displacements and member forces, resulting in the half-cuboctahedron grid to be a more feasible configuration for large span roof structures. Applications/ Improvements: The application of the tensegrity structure is to applied in the large span roof structures.

Keywords

Form Finding, Half-cuboctahedron, Hexagonal, Member Forces, Nodal Displacements, Tensegrity.

Full Text

   

Sunumol Sulaiman ¹, N. Parthasarathi ¹, B. Geetha ¹, K. S. Satyanarayanan ¹

Affiliations
1 Department of Civil Engineering, SRM University, Kattankulanthur, Kancheepuram - 603203, Tamil Nadu, IN

Abstract

Background/Objectives: Sustainability in the use of material and economy are the watchwords of the modern engineering fraternity. Many structural systems have been evolved for this purpose. At present, the qualities of the tensegrity structures, which make the technology attractive for human use, are their resilience and ability to use the material in a very economical way. Thus, the construction of the structures using tensegrity principle will make them highly resilient and reasonably economical at the same time. Methods: Though a lot of research has been carried out on the behaviour of tensegrity systems, the area requires further research for a complete understanding. Hence, this project is aimed at analysis of a tensegrity based roof structure. The prototype module used is half-cuboctahedron. Findings: First, a single module measuring 1 m x 1 m in size, is modelled and analysed using an FEM based software. The investigations are then extended to a 2 x 2 grid, measuring 2 m x 2 m in size. The behavior of the grid is studied under the application of external loads varying the prestressing forces on the members. Later, a 4 x 4 grid, measuring 4 m x 4 m in size and an 8 x 8 grid, measuring 8 m x 8 m in size are modelled and analysed based on the 2 x 2 grid system. From the analysis, it is found that the displacements of the system satisfy the permissible limits as per previous research values. The member forces have also been analysed. Applications/Improvements: The performance of the half-cuboctahedron tensegrity grid structure proves to be more suitable for larger span structures.

Keywords

Displacements, Half-Cuboctahedron, Hexagonal, Tensegrity.

Full Text

   

M. Sakthi Seethalakshmi ¹, M. Prakash ¹, K. S. Satyanarayanan ¹, V. Thamilarasu ¹

Affiliations
1 Department of Civil Engineering, SRM University, Chennai – 603203, Tamil Nadu, IN

Abstract

Background/Objectives: Progressive collapse occurs when primary structural element fails due to many reasons such as impact, bomb blast, earthquake, abnormal loading etc., resulting in the failure of adjoining structural elements, which in turn causes partial or total collapse of the structure consequently. It is studied widely in Reinforced Concrete (RC) framed structure. Methods/Statistical Analysis: The present study investigates the comparative behaviour of four bay, five storey RC bare frame, infilled frame and infilled frame with openings and to assess the effect of infill to resist the progressive collapse. A linear static analysis is carried out using finite element software using SAP 2000 and maximum moment (M), shear force (V), axial force (P), deflection (U) for both beams and columns generated before and after middle column removal are studied and compared. Findings: There is an average of 30% and 34% decrease in moments for infilled frames when compared to a bare frame. The percentage of decrease in moments increases to an average of 71% when the column is removed. Similarly, the deflection for infilled frames decreases by35% when compared with bare frame and only 17% increase when infills are provided with openings on removal of column there is average of 88% decrease in deflection for infilled frames when compared with bare frame. It shows that the presence of infilled frames will delay the progressive collapse when compared to bare frames. Application/Improvements: The study can be extended to the non-linear range and also to find its dynamic response.

Keywords

Infilled Frame and Infilled Frame with Openings, Progressive Collapse, RCC Frame

Full Text

   

V. Thirumurugan ¹, S. Anjali ², S. Muthu Kumar ¹, K. S. Satyanarayanan ¹, T. P. Ganesan ³

Affiliations
1 Department of Civil Engineering, SRM University,Kattankulathur, Chennai - 603203, Tamil Nadu, IN
2 Department of Structural Engineering, SRM University,Kattankulathur, Chennai - 603203, Tamil Nadu, IN
3 SRM University, Kattankulathur, Chennai - 603203, Tamil Nadu, IN

Abstract

Objective: The aim of this work is to study about the behavior of seven storey single bay infilled frame with pneumatic interface under various levels of pressures with lateral loads.Method: Linear analysis was carried out using a finite element based software by modeling various 2D frames. The dimension and reinforcement details for the frames are chosen based on the experimental study. For infilled frame with pneumatic interface different pressure configuration at different levels shall be considered in the study. Findings: The study of behavior includes stiffness, bending moment, axial force and shear force. The analysis of infilled frame with cement mortar interface and bare frame was also carried out to compare the frame stiffness and member forces of these frames.Interface characteristics have also influence the structural behavior of infilled frame. It has effect on overall stiffness and of the in-plane moment of inertia of composite frame and modifies energy dissipation. Applications: The research idea can be implemented in construction field so that the structural failure during earthquake will be minimized. The research work has been done relevant to study the behavior of infilled frame and to adopt new technique which can improve its performance. This study can be the basis of further studies which can increase the number of parameters under various conditions.

Keywords

Bare Frame, Cement Mortar, Infilled Frame, Interface, Pneumatic Interface, Stiffness

Full Text

   

S. SindhuNachiar ¹, K. S. Satyanarayanan ¹, M. Lakshmipathy ¹

Affiliations
1 Department of Civil Engineering, SRMIST, Kattankulathur, Kanchipuram Dt, TN, IN

Abstract

Biomimicry is the concept of mimicking nature and is efficient in terms of its performance, sustainable and innovative in terms of solving a problem in a unique way rather than the conventional method and has future scope. In the field of architecture, the concept can be used to improve the design of the structure, its construction techniques and to reduce its impact on the environment. This knowledge makes us think in an innovative way for creating improved civil engineering and architectural structures. Human Skeleton is the highest evolving species. The human leg bone (Femur) carries the total weight of the body and the human hand bone (Humerus) acts as a tension member. Similar to the natural human skeletal elements, the column which is a structural element plays the major role in the building by transferring the total weight of the body to the earth surface. This key idea of nature is mimicking to the composite columns of the framed structures, which should withstand both vertical and horizontal loading of structure. Research is carried out to model a column similar to the stress pattern of the human leg bone and a tie member similar to the stress pattern of human hand bone. By which the human skeletal system is being mimicked to form a structural system for building construction. In this paper some of the bio inspired structures and the literatures related to biomimics and the femur and humerus bone analysiswere discussed.

Keywords

Biomimics, Skeletal System, Structural Systems, Literature, Femur, Humerus.

Full Text