Model elastomeric bearing in midas civil

#Model elastomeric bearing in midas civil free#

They had studied Shrinkage and daily atmospheric temperature variation in structural concrete and long-term deflection in Pre-stressed concrete girders. Also the expansion joint to be adopted for various numbers of spans depending on the amount of longitudinal expansion caused due to uniform temperature in the structure has also been attended to.Д«ehaviour of pre-stressed concrete bridge girders due to time dependent variables and temperature effects was investigated by S.R. In this paper it is discussed about the effect of temperature gradient for continuous beams of various spans and the flexural moment developed in the structure due to positive and negative temperature gradient using MIDAS Civil analysis software. Among these three variables the effect of temperature is more than creep and shrinkage which are directly depending on the effect of temperature.

The variables like creep, shrinkage and temperature act only in service stage. Needless to say the stresses developed in service stage should be within the permissible limit. Bridge structures are designed for strength case and the stresses during service stage need to be checked to ensure the safety of the structure in terms of deformation, vibration and aesthetics.

Presently predominant codal requirement calls for Limit State method of design due to quality controlled construction environment. In modern construction practice PSC bridge structures are preferred over conventional Reinforced Cement Concrete (RCC) bridge structures for the construction of major bridges. Bridge structures can be constructed either as simply supported or continuous depending on the feasibility of the structure. Key words: PSC Bridge, Temperature gradient, Continuous Structure, Straight and Curved Bridge, Expansion joint.ДЄ bridge structure plays a vital role in the development of countries infrastructure domain by facilitating the connection between two inaccessible points and also carries traffic or other moving loads over a depression or obstruction such as channel, road or railway. It is also intended to know the variation of temperature gradient as the number of continuous span increases and the amount of flexural moment developed due to temperature gradient.

#Model elastomeric bearing in midas civil free#

It is preferable to adopt expansion joints for the free movement of the structural member due to variation in temperature and also to provide the required steel or pre-stressing force to encounter the bending deformation due to temperature gradient. If the longitudinal expansion due to uniform temperature is prevented the girder may experience considerable axial forces which could lead to damage of the structure and cracks may appear in the structure. The uniform temperature change only causes change in axial length of the member while the temperature gradient causes bending deformations. Variation in temperature distribution in bridge structure can be described in terms of i) Effective bridge temperature or uniform temperature and ii) Temperature difference or temperature gradient. Among these three variables the effect of temperature is predominant compared to creep and shrinkage, which in turn, are directly depending on the effect of temperature. These causes decrease in service life of bridge and in the long run require strengthening with external pre-stressing to secure its original load bearing capacity. Bengaluru,ДЈ PG Student, Department of Civil Engineering, The National Institute of Engineering,ДЄbstract: There is a long term deflection in continuous Pre-stressed Concrete Girders (PSC) due to creep, shrinkage and daily atmospheric temperature variation, inhibiting lower load bearing capacity. Effect of Temperature Gradient on Continuous PSC Bridge for Straight and Curved ProfileДЎProfessor, Department of Civil Engineering, The National Institute of Engineering, Mysore, Karnataka, IndiaДўAdvisor, Department of Structural Engineering, SECON Pvt.