Model elastomeric bearing in midas civil

#Model elastomeric bearing in midas civil verification#

Maximum bearing dimensions depends on space available on bearing shelf. Longitudinal loading- braking, skidding to temperature-induced expansion and contraction (to BD37/01 or BS EN 1991-5)ДЄ detailed analysis should be carried out in midas civil to determine the maximum design load in accordance with the above-mentioned design standards.Дisplacement of the bearing is calculated from the point of fixity.Д¬oefficient of thermal expansion and contraction as per BS 5400-2, cl 5.4.6 Transverse loading- skidding loading (to BD 37/01 or BS EN 1991-2) Minimum vertical is normally permanent loading added to negative loading because of uplift. Maximum vertical load is the sum of all vertical loading applied to the support. The design load section establishes a spectrum of loading from minimum to maximum. Similarly, other types of bearing (pot PTFE, Pin-roller) can also be defined for analysis using elastic/general links.

Below shown is the part of a typical bearing schedule from BS EN 1337- 1 : This design should satisfy all the parameters mentioned in the bearing schedule. Detailed design of the bearing is carried out by the manufacturer. Once this document is completed, it is forwarded to the bearing manufacturer involved in the project. The table contains information such as design load, displacements, rotations, maximum bearing dimensions, etc. This table needs to be filled by the designer. The bearing schedule contains all the information about the new bearings. Part 10 and 11 of the standards are inspection and maintenance, storage and installation of bearing respectively. Part 9 specifies the measures to protect bearing from the effects of the environment which could reduce the working life of the bearings. Part 3-8 deals with the quality and design standards of different types of bearings. Part 2 is related to the sliding and de sliding elements of a bearing. Part 1 is related to general design rules and bearing schedule template. Structures with loaded length less than 2mД¬S454 is used for the assessment of the deck and BD37/01 is used for bearing design.Д«earings are designed to BS EN 1337.Structures with longitudinal members at the centers of 2.5m or less with low transverse distribution.Structures with transversely spanning trough decks.Not suitable for certain situations (cl.5.6).Based on real vehicle with authorized weight.Assessment live loads to be considered are ALL Model 1 and ALL Model 2:

#Model elastomeric bearing in midas civil verification#

Detailed assessment verification reports can also be generated in midas Civil. Assessment of the PSC bridge can be performed in midas Civil asper CS 454. The basic assessment process for CS 454 is shown below. It also has traffic load models for loaded lengths greater than 50 m, previously in BD 50. CS 454 includes wind, thermal, and HB load models in the new appendix, previously in BD 37. However, BD 21/01 was superseded by CS 454, which was released in June 2019 and revised in March 2020. Even though the cost of installing the bearings in good conditions may be high, it excessively small compared to the cost of failure of a bridge structure.ДЇor PSC bridges, BD 21/01 was used earlier for the assessment of the deck during jacking. Failure of the bridge bearings could lead to catastrophic failures of the bridge. There can be inconsistencies during the installation, which can cause the failure of the bearings even before their life span. In most cases, the life span of the bridge bearings is less than that of bridges. Inspection and Maintenance Needs of Bridge Bearings

Bearings also reduce shear demand on the head of the piers or abutments.

Bearings play an important role in the adjustment of the dynamic properties of bridges (eg.Allow translational and rotational movement of the superstructure and avoid the generation of secondary stresses in the structure.Help in dissipation and transfer of dynamic forces to the substructure without causing any wear or damage.Some of the most important functions of bridge bearings are listed below. The main purpose of bridge bearings is to connect the deck to the substructure. Bridge bearings are important structural components of bridges.