International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 05 Issue: 06 | June-2018
p-ISSN: 2395-0072
www.irjet.net
RELIABILITY ANALYSIS OF COMPOSITE BRIDGES Karthik. C R1, Mr. A.R Pradeep2 1M.Tech
student, civil Engineering Department, Sri Siddhartha institute of technology-Tumkur Civil Engineering Department Sri Siddhartha institute of technology-Tumkur ---------------------------------------------------------------------***--------------------------------------------------------------------2proffessor,
Abstract - The prediction of the ultimate load capacity of composite bridges of slab on I steel girder construction is necessary. This is dictated by design requirements for the ultimate limit states of such bridges. In this paper, the prediction of the most probable yield line patterns of failure for relatively wide composite bridges is presented. The prediction is based on a parametric study as well as on laboratory test results on composite bridge models. The degree of fixity between the transverse steel diaphragms and the longitudinal steel girders is considered with respect to influence on the ultimate load capacity of the bridge. Good agreement is shown between the theoretical and experimental results. A method of relating IRC truck loading to the collapse load is presented. The derived equations can be used either to predict the ultimate load capacity or the required ultimate moments of resistance for design of simple-span and of continuous-span composite bridges. An illustrated design example is presented.
ability of a component of system to function at a specified moment of interval of time. 1.2 First order reliability method There are various sources of uncertainties present in the structure should be considered in engineering design. Reliability analysis methods provide a framework to account for these uncertainties in a sensible manner. In this reliability analysis there are two types. First Order Reliability Method (FORM) and the Second Order Reliability Method (SORM).These methods are used to design and analysis of composite bridge structure with academic examples. Engineering design purposes to provide minimum levels of serviceability and safety during the structural lifespan. 2. OBJECTIVE OF STUDY The main objective of this paper to about determine the girder and web structural system can be applied to design the bridge structure. While using efficient methods with ensuring safety measures. In order to fulfil the above purposes, a procedure is developed to evaluate redundancy of any given bridge structure as part of the broader concept of toughness.
Key Words: Reliability index, probability failure, CSI BRIDGE software, Three span bridge, weided plate girder. 1. INTRODUCTION Highway and railway bridges show a significant role in transportation systems. The vibrations happen due to the passage of vehicles have become an important consideration in the project of bridges. In particular, the collaboration problem between the moving vehicles and the bridge structures has involved much consideration throughout the last three decades. This is in part due to the fast growth in the proportion of heavy vehicles and high-speed vehicles in the highway and railway traffic and the trend to use high quality materials and therefore more slender sections for the bridges.
Based on the above discussion, the two major objectives of this thesis are:
Composite' means that the steel structure of a bridge is fixed to the concrete structure of the deck so that the steel and concrete act together, so reducing deflections and increasing strength. River bridges are unique steel concrete composite deck slab bridges they are use T-shaped steels with a satisfying projection on the outside surface of the flange as a shear connector.
Procedure Main procedures used to design bridges are: Three-span composite bridge upto 45m. Concrete slab with I girder at a interval of 15m span. Analyse the bridge model and find out the design properties for the bridges. Find out reliability index of a structure by using first order reliability method.
1.1 Structural reliability theory Reliability methods are useful tool for describes the ability of a system or component to function under stated conditions for a specified period of time. Reliability is closely related to availability, which is typically described as the © 2018, IRJET
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To improve a working definition and mathematical formulation for the reliability analysis of the bridges at the system level in probabilistic design. The developed procedure will be used to measure the redundancy level of vehicle interact and damaged bridges in case of an accident. The expected traffic loads on interact and damaged bridges are Modelled and an acceptable level of failure probability for the structure should be determined.
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