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  1. bridgeman8

    Bridge Pier/Bent Design - temperature/shrinkage internal forces

    When designing rigid frame bridge bents, is it appropriate to account for substructure member length changes (bent cap) due to temperature and shrinkage? RCPier allows you to input strain loads to model temperature and shrinkage effects of the bent. When the bent cap gets shorter in length due...
  2. bridgeman8

    Differential Deflections and Intermediate Diaphragms

    VOD, Skewing the diaphragms is a good option. AASHTO limits this to 20 degrees however. For skews larger than 20 degrees, the diaphragms must be normal to the main members. Another option would be to stagger the intermediate diaphragms. Could you give me a little more detail about doing...
  3. bridgeman8

    Differential Deflections and Intermediate Diaphragms

    One of my reference books states that for skew angles not exceeding 30 degrees for slab-on-beam bridges, bridges can be safely designed as right or normal bridges by simplified methods. However, for larger skew angles, the torsional moments, which are not calculated directly in simplified...
  4. bridgeman8

    Differential Deflections and Intermediate Diaphragms

    I have a question about designing intermediate diaphragms when there are differential deflections of adjacent steel girders. Typically, intermedate diaphragms are designed to transfer wind loads and to meet all applicable slenderness and minimum material thickness requirements. This is...
  5. bridgeman8

    Elastomeric Bearing Rotatons

    Thanks for your responses. I agree with maxmozo. The AASHTO LRFD Commentary section C14.4.2 allows for temporary overstress during construction. I do not have to consider the case of temporary uplift caused by light load and large rotations immediately after the girder is placed on the bearings.
  6. bridgeman8

    Expansion/fixed bearing locations for single span bridge

    I'm designing a single span bridge with elastomeric bearings. End bent 1 is higher in elevation than end bent 2. Which end bent should use expansion bearings and which end bent should use fixed bearings? I think I remember reading that there was an advantage to using fixed bearings at the...
  7. bridgeman8

    Elastomeric Bearing Rotatons

    I have a question about elastomeric bearing rotations. I'm designing steel reinforced elastomeric bearings for a single span steel railroad bridge (transit). I'm using AREMA and AASHTO Standard Specifications to check the rotation requirements. Do I need to check bearing rotations during...

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