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Recent content by fish1

  1. fish1

    Scour Potential near a Spillway

    Hello All, I would like to determine the potential scour depth at the entrance to a fish ladder located near a small dam's spillway. The fishway protrudes into the path of the spillway flow about 9 ft. The structure extends from the abutment (about 2 ft downstream of the spillway) at a 45 deg...
  2. fish1

    Wave forces on a barrier net

    Hello, I am looking for advice in how to address forces due to waves acting on a net suspended in the open water. The net would be located in front of a cooling water intake. I have calculated the forces acting on the net due to intake velocity headlosses, but i have not considered wave...
  3. fish1

    Vibration Monitoring

    Your responses have been a great help. The historic structure has a stone masonry foundation and is located about 100 ft from where the piles will be driven. i found a good article from the ASCE Construction Congress 6, Orlando, Florida, Feb 22, 2000. The title is "Construction Vibrations and...
  4. fish1

    Vibration Monitoring

    Thank you for your response. i would be interested in reading those articles. you can email them to me at gallen@aldenlab.com. For residential buildings i have found that the most common value used for maximum particle velocity is 2 in/sec. I will probably write this into the specifications...
  5. fish1

    Vibration Monitoring

    Hello everyone, I am looking for criteria regarding acceptable vibration limits at the foundations of historic buildings due to near by pile driving (construction activities). We are considering requiring vibration monitoring at an old building near the construction site. Is there a standard...
  6. fish1

    High Volume Low Head Pump

    Sure, I am guessing it would be a special order, which should not be a problem, but would it be as efficient? Currently i am leaning towards the bow thruster option based on costs. but a bow thruster can not produce much head, and i would like to measure the flow using a venturi meter which...
  7. fish1

    High Volume Low Head Pump

    I am considering pump options for a new hydraulic test facility i am designing. The pump requirements are 150 cfs at 10 ft of head. The only options i am aware of for this application are a bow thruster or a horizontal turbine pump by peerless. Does anyone know of any other options? Thank you,
  8. fish1

    RISA 3D analysis

    Thanks for your help ctmfab. I revised my model by converting the longer member into multiple from node to node. The results were reasonable with the new model without error messages.
  9. fish1

    RISA 3D analysis

    Hello, I am hoping someone can help me out with a truss analysis I did using RISA 3-d. I have not used RISA in a few years, and i have designed a wooden truss for a friend building a house. I decided to check my hand calcs with RISA to get more familar with the program. I set up the model...
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