Design of reinforced concrete beams using euorocode 2 and bs 8110

• Main Author: Lee, Yuanmin
• Other Authors: Chuang Poon Hwei
• Format: Final Year Project
• Language: English
• Published: 2014
• Subjects: DRNTU::Engineering
• Online Access: http://hdl.handle.net/10356/61231
• Institution: Nanyang Technological University

Eurocodes will become mandatory under the Singapore prescribed building codes for structural design of buildings and civil engineering works with effect on 1st April 2015. This signifies a need for the people in Singapore that are related to civil engineering works to comprehend the phase of transition from British Standards to Eurocodes. Thus, this report aims to analyse and evaluate the comparison of shear capacity of reinforced concrete beams without shear reinforcement against experimental beam data using Eurocode 2 and BS 8110. In addition, the present study will focus on normal strength concrete and high strength concrete beams without shear reinforcement with shear-span to depth ratio of 2.5 to 7. Furthermore, 4 major parameters will be evaluated for the effect of shear strength on reinforced concrete beams. The 4 parameters have been proven by previous research to have noteworthy influence on the shear behaviour of concrete beams, namely: concrete compressive strength, shear-span to depth ratio, effective depth and longitudinal reinforcement ratio. A total of 163 experimental beam specimens comprising of 91 normal-strength concrete beams and 72 high-strength concrete beams were extracted to compare with the predicted shear capacity using Eurocode 2 and BS 8110. In order to determine the predicted shear capacity values of Eurocode 2 and BS 8110, the development of an excel spreadsheet was essential to calculate the shear capacity based on the design criteria from the two design codes. These calculated shear values were used in comparison with the experimental values provided in previous respective journals to evaluate BS 8110 and Eurocode 2. From the analysis of general statistical comparison, Eurocode 2 and BS 8110 display similar results for normal strength and high strength concrete beams. Further investigation, the results also illustrate the influence of concrete compressive strength, shear-span to depth ratio, effective depth and longitudinal reinforcement ratio on the shear strength of normal strength and high strength concrete beams. In conclusion, Eurocode 2 appears to be highly accurate and should possess the ability to produce normal-strength concrete beams that are more economical. However, except for longitudinal reinforcement ratio, both Eurocode 2 and BS 8110 show a down trend in safety margin for the design of shear capacity for high-strength concrete beams. Thus, more research has to be done for high strength concrete beams as the design codes appear to be not conservative for the effect of increasing concrete compressive strength, longer shear-span to depth ratio and larger effective depth.