model elastomeric bearing in midas civil

P A ± M L Z L ± M T Z T In order to assure no tension at the bottom, the dimensions of footing are fixed based on the base pressure.Ģ7 Stability Checks: FOS >1. safety factors) have to be used for the analysis of elastomeric bearings according to EN 1337-3. They were designed complying with EN1337-3. The elastomeric-bearing dimensions are presented in Table 1.

This hybrid Elastomeric/Sliding Bearing provides a stainless-steel-on-PTFE slip plane on top of a conventional Elastomeric Bearing. Vertical and horizontal reactions from the superstructure. The elastomeric-bearing pads are used as bearings in one row to connect deck to piers and abutments. A particularly common variation is shown in Fig.

The dimensions of the footing are based on the base pressure check : Forces due to lateral earth pressure.

The ability of elastomer to carry large vertical loads is because of reinforcement provision that prevents lateral bulging of elastomer. Shear Strength The nominal shear strength provided by concrete subjected to flexure and axial compression should be computed by Vn = Vc + Vs + Vp 0.25 f c ' bvdv + Vp Here Vc = shear resistance due to concrete = b fc bvdv where f c ' = concrete compressive strength bv = effective web width dv = effective shear depth taken as the distance, between tensile and compressive forces due to flexure, it should not be taken less than the greater of 0.9de or 0.72D b = factor indicating ability of diagonally cracked concrete to transmit tension as specified in S, taken as 2 for non-prestressed members And Vs = shear resistance due to steel = /s where: s = spacing of stirrups q = angle of inclination of diagonal compressive stresses as determined in S (deg) = 45 deg for nonprestressed members a = angle of inclination of transverse reinforcement to longitudinal axis (deg) = 90 deg for vertical stirrups Av = area of shear reinforcementĢ5 Design of Abutment Design loads Dead loads Live loads and impact from the superstructure Wind loads on the structure and the live loads Centrifugal force from the superstructure Longitudinal force from live loads (braking and traction) Drag forces due to the friction at bearings Ice pressure Earthquake forces Thermal and shrinkage forces Forces due to settlement of foundations Vehicle Collision LoadsĢ6 Design of a Cantilever Abutment with Shallow Footing The Abutment comprises of 3 components, heel, stem and toe. Elastomeric Bearings for Bridge Structures It consists of elastomer manufactured from synthetic or natural rubber and can take both translation and rotation movements through elastomer deformation.

Model elastomeric bearing in midas civil