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  1. AK4S

    Structure behaves as an arch or flexural member?

    I am working on load rating of an existing bridge structure; a reinforced concrete arch built in 1902. The structure has a short 7ft clear span with concrete profile, with 16” thick arch ring which encases 10” deep rolled steel beams spaced at 2ft on center spacing. See attached sections of...
  2. AK4S

    embedment/development length for drilled and grouted reinforcement using cementitious grout

    thread507-500937 I am running into the same query posted in the linked thread mentioned above. Bridge Project. Application: Embed Vertical rebar for a new concrete barrier into existing concrete below. Concrete barrier can see lateral load from vehicular collision. so rebar will see shear and...
  3. AK4S

    Live Load notes on Existing Building Drawings (different values for Beam and Slab)

    I am working on some rehabs in an existing building and trying to make sense of the Notes provided in the Structural Drawings for Live Load. See below extracts of the Structural Drawings dated 1960. Educational Building located in Massachusetts. Design Live Load = 100psf on beams, 150psf on...
  4. AK4S

    Canopy support to brick veneer

    Looking for suggestions to figure out how to resolve a canopy support issue. I designed a canopy support at the Overhead garage door openings at a building for the configuration proposed by the architect. The structural framing is primarily HSS tubes supporting the canopy deck with HSS members...
  5. AK4S

    Bolted Web Splice Joint behavior

    I am involved in a discussion regarding the behavior of a Bolted Web Splice Joint and looking for some clarity to understand the true behavior of the connection. In an existing bridge(several simple spans), one of supports appears to have been constructed incorrectly (shifted by 3ft, whereas all...
  6. AK4S

    Starter wall and Upturn Key at Wall-to-Mat/footing - ACI 350 recommendations

    Looking for opinion regarding ACI350 recommendations for (1)Starter wall and (2)Upturn Key at Wall-to-Mat/footing interface in concrete water tanks. Especially if someone is involved in the code committee or is aware of the upcoming revision to ACI350 which references this item. I have been...
  7. AK4S

    Stair support

    I am looking at a new/proposed stair on an existing building which goes from a low roof to a High roof along a sloped roof portion. Its a maintenance stair (~3ft wide), so live load is limited (60psf snow load governs) The stringer is lifted about 12" above the roof surface using a vertical...
  8. AK4S

    Railings: IPE Top rail Connection to Post

    I am working on the connection detail of a Guardrail system and not able to figure out how a commonly seen system works! Railing system: Aluminium post with IPE top rail (no other sub rail). This appears to be a common system as I could find several fabricators online (See attachment for...
  9. AK4S

    American Aluminum sections - Capacity tables available per ADM?

    Similar to the steel manual, Are there capacity tables available for American Aluminum sections? I am trying to explore multiple configurations and currently using section properties and procedure from the Aluminum Design Manual (ADM), proceeding with hand calculations. But with the level of...
  10. AK4S

    Concrete-filled steel pipe piles (Non-composite): query

    I am working on the Structural Design of a Concrete-filled steel pipe pile (Non-composite)and was looking for some clarifications. Sorry about the long post. I couldnt find a reference which goes through the analysis and so wanted to list it here to confirm my understanding. SDC-A seismic...
  11. AK4S

    Dimension "k1" of Historic Steel Sections: 27WF102, 33WF130, 33WF141 (year of fabrication

    I am trying to find the value k1 (Detailing distance from center of web to flange toe of fillet, in.) for the Historic Steel Sections: 27WF102, 33WF130, 33WF141 (year of fabrication 1959). I need the dimension to estimate the width of fillet weld at the Web-Flange interface in order to...
  12. AK4S

    Load distribution on a Pile Cap

    Wanted to confirm the methodology to Analyze a pile cap to distribute the axial and lateral loads to individual piles. Refer to the below sketch, which shows an elevated platform area with walkways connected at two locations. The platform area is to be supported by two pile caps as shown...
  13. AK4S

    Repair of Corroded Beam Web

    For an existing Highway Bridge we are reviewing, there is significant loss of section in the beam webs at the bearing location. I have attached some sample photos (these locations are not too bad, some others are worse). The current proposal is to reinforce the beam web by bolting on new...
  14. AK4S

    Rehab work: Responsibility of checking loads from Scaffolding supports: EOR vs Contractor’s engineer

    This is regarding a Rehab Project where the contractor is performing some work on the roof of a multi-story building. The Contractor needs to install Scaffolding & Shoring for his work. Typically what I have seen on Projects: The Contractor's engineer is responsible for the load of the...
  15. AK4S

    AASHTOWare query:Service Load Rating of Precast Prestressed Concrete members

    Hi All, Looking for guidance from Bridge Engineers using AASHTOWare for Rating. I am looking into the Rating of a Bridge with Precast Prestressed Concrete Deck beams. I am interested in calculating the Inventory level serviceability ratings per the attached extract of the MBE. How do I navigate...
  16. AK4S

    AISC Design Example: Query on flexural strength of connection plate

    I am looking at the AISC Design example (EXAMPLE II.A-20 ALL-BOLTED SINGLE-PLATE SHEAR SPLICE) attached with this post. On Page 3 of the PDF, to calculate the Flexural Yielding of Plate, the equation Mn =Fy*Z is used. Per AISC Manual (14th Ed) Chap 9, for Connecting elements subject to...
  17. AK4S

    Rating a Shear Connection using Allowable Stress

    Need some advice from any Bridge Rating Engineers. I am rating an existing bridge (4 Simple spans,rolled steel beams with a noncomposite concrete deck) which has a Shear connection (Web Splice plate only. No splice connection on the flanges) on the beams of one of the interior spans. It looks to...
  18. AK4S

    Cracks in Existing Concrete slab with PT beams

    I was looking at the roof of an existing Building which has Post Tensioned Concrete Beams with 5" thick concrete slab spanning between the beams. I see cracks at the bottom of the slab. The attached sketch shows the crack pattern observed. I am trying to find the cause of the crack before I...
  19. AK4S

    Seismic analysis and design of liquid storage structures-query

    I am working on the seismic analysis and design of partially buried / ground-supported liquid storage tanks and I am looking for some guidance regarding the analysis and design approach. • ASCE 7-05,Section 15.7.6 covers ground-supported storage tanks and provides equations for calculation of...

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