Comparison of Two Similar Buildings with and Without Base Isolation
Reinforced concrete is a major construction material for civil infrastructure in current society. Construction design has always preceded the development of structural design methodology. Dramatic collapse of buildings has been observed after each disastrous earthquake, resulting in loss of life. To prevent such a loss Base isolation is used which enables a building to survive potentially devastating seismic impact by providing flexibility into the connection between the building and the foundation. The mechanism of the base isolator increases the natural period of the overall structure, and decreases its acceleration response to earthquake/seismic motion. A reinforced concrete building with lead rubber bearing is used. The study analysis performed to check for the adequacy of the base isolation against earthquake damage when compared to the conventional earthquake resistant design. A building was analyzed using the equivalent lateral force method and response spectrum analysis as fixed base (FB) and as isolated base (IB) with lead rubber bearing. The analysis represents a case study for reinforced concrete to show the ultimate capacity of the selected bearing system, and to make a comparison for the difference between the isolated base and the fixed base buildings. Results show that the presence of the lead rubber bearing reduces significantly the displacement, moment and shear generated for the same mode and hence the reinforcement required is also lesser when compared to the traditional fixed based structure.
Published by: Syed Ahmed Kabeer K I, Sanjeev Kumar K.S
Author: Syed Ahmed Kabeer K I
Paper ID: M1P1-1140
Paper Status: published
Published: October 20, 2014
Mechanical Properties of Alkali Treated Agave Americana (Rambaans) Fibre Reinforced Epoxy Composite
Composite based on short Agave Americana (Rambaans) fiber (untreated and alkali treated) reinforced epoxy resin using three different fiber length (3 mm, 5 mm, and 10 mm length) are prepared by using open mould technique. The composite thus prepared were subjected to the evaluation of different mechanical properties such as tensile and impact strength. The results obtained suggest that composites reinforced with Agave Americana fiber exhibited better mechanical properties than neat epoxy. All mechanical test showed that alkali treated fiber filled composites withstand more fracture strain than untreated fiber composites. Keywords: Composite; Agave Americana fiber; Alkali treatment; Epoxy Polymer; Tensile and Impact strength.
Published by: Bhupendra Kumar Saraswat, P. C. Gope
Author: Bhupendra Kumar Saraswat
Paper ID: M1P1-1141
Paper Status: published
Published: October 20, 2014
Uncertainty in Improving Durability Aspects and Mechanical Properties of Bamboo Reinforced Concrete
The construction industry uses the most of clean energy and also produces most of the carbon dioxide in the present global world. The production of one ton of steel and concrete emits more than two tonne and one tonne respectively of carbon dioxide whereas production of one tonne of bamboo consumes more than one tonne of carbon dioxide from the atmosphere. In SAARC countries like India where about two-third of the population live below poverty line, there is a great need of some other suitable construction material in terms of cost, availability and environment friendly. Towards this, many researchers in the past has emphasized on the use of Bamboo as reinforcement. Bamboo offers competitive strength to mass ratio, compared to re-bars. Since it is a natural material,the necessity to understand their long term behaviour regarding its acceptance as a suitable construction material in general is important. Due to the advantageous characteristics of bamboo, efforts should be made to popularize the use of bamboo. In this study, a review of the existing research work on Bamboo Reinforced Concrete with the emphasis on the various factors, which are considered as demerits in making bamboo reinforced concrete construction, as a tool is presented. This uncertainty study may serve the goal of making the dream of common people, to have their own home, come true. Keywords: Bamboo Reinforced Concrete, Durability, Mechanical Properties, Economic and Environmental Friendly Reinforcement.
Published by: Dhanendra Kumar, Dr. S. Mandal
Author: Dhanendra Kumar
Paper ID: M1P1-1142
Paper Status: published
Published: October 20, 2014
Human Factor Considerations in Sewing Machine for Workstation Design
There is a need of ergonomically fit sewing machine workstation so that sewing machine operators can perform their tasks comfortably. The present study was initiated where worker’s perceptions were measured by preparing questionnaire to find out difficulties during sewing machine work. Questionnaires were filled up by 100 sewing machine operators from different parts of the region. Questionnaire included the different modules which are Perceived posture, localized postural discomfort and estimated endurance time. Worker’s perceptions were analyzed by finding their critical values. Criticality index of questionnaire was calculated for concluding the most critical areas. Based on the criticality index, recommended parameters were performed on selected operators. Nine sewing machine operators performed experiments at twelve different combinations of table height, desk slope and pedal position. ANOVA technique was used to analyze the data obtained from nine selected sewing machine operators after performing experiments and the dimensional adjustment of sewing machine workstation was made, in relation to desk height, desk slope and pedal position. The recommendations were formulated in order to minimize the load on the musculoskeletal system during operation in terms of anthropometric dimensions with respect to sewing desk height, desk slope and pedal position. Statistical methods were used to find out the significance of the parameters considered in the study. So sewing machine workstation is said to be best fitted; only if it will have desk height +10 cms (above elbow height), desk slope 10° and pedal position -4 cms.
Published by: Gurbhej Singh
Author: Gurbhej Singh
Paper ID: M1P1-1143
Paper Status: published
Published: October 20, 2014
