Week 5 Challenge
- What is difference between free and fix pier and how it impacts the foundation size. Also add the calculation of loading in both the cases.
Bridge bearings are structural equipment or devices installed between bridge substructure and superstructure to transfer the applied load including earthquake loads; wind loads; traffic loads; and superstructure self-weight. Bridge bearings also makes rooms for relative movements between superstructure and substructure, for instance, rotation movements and translational movements in horizontal and transverse direction. Bearing used in the construction of bridge structure is divided into two major categories namely expansion bearings and fixed bearings. The former permits both translational and rotational movements whereas the latter allow rotational and limited translational movements. There are several types of bridge bearings which have been employed in bridge construction.
Loading difference as per IRC is as follows:
- To list all RCC design checks to be done in the ultimate state and serviceability state for a cracked section as per IRC codes and mention clauses.
IRC 6 Table B.1,Table B.2, Table B.3 & Table B.4
|
A |
Ultimate Limit State (For verification of Equilibrium) |
|
A-1 |
Basic Combination (Overturning /Sliding) |
|
B |
Ultimate Limit State (For verification of structural strength) |
|
B-1 |
Basic Combination |
|
C |
Serviceability Limit State |
|
C-1 |
Rare Combination (For checking stress limits) |
|
C-2 |
Quasi-permanent Combination (For checking crack width in RCC structures) |
|
D |
Combination for Design of Foundation |
|
D-1 |
Combination 1 |
|
D-2 |
Combination 2 |
Stress check & Crack width Check as per IRC 112 CL.12
Overturning Stability IRC 78 Cl.706.3.3
Open Foundation design IRC 78 Cl.707