I need to cut an existing masonry wall and put a 6 foot door in the wall. What construction sequence should be followed? How will the shoring and lintel placement be handled?
I am looking at the plans for a steel frame and masonry building from 1964. Several of the beams use a notation as follows: 10 B 11.5. Is that a Wide flange section?
Hariharan, I have worked with several DOT's on Bridge design. North Carolina only uses epoxy coated bars in the top of the deck while in Virginia epoxy coated bars are used in everything including the substructure. I did do some work with Florida, but can not remember their policy.
I have...
Antennas have been mounted to the walls of the penthouse of a masonry building. There is a crack in the mortor joint about four courses down from the roof. The antenna mounts consist of an angle at the top with two bolts and the same about 3' to 4' below the top. The crack is between these...
I am looking for reference material on Bridge Widening. Is there a reference that discusses common problems encountered and solutions that were involved. Or does anyone have any personal experiences with widening projects that they could share with me.
Thanks.
Thank you Qshake, you are right the structure is a noncomposite W-section superstructure which is in good shape. It was replaced in 1990. So you are saying that it will be necessary to remove the superstructure to place the interior bent? The opening is large enough, hydraulically to allow...
I need to increase the capacity of an existing structure by adding an interior bent. The bridge is small, only a 27' span over a creek. How would the contractor add an interior bent without affecting the superstructure? Is it even possible? What design details would help with construction...
Actually, the coefficients were developed using SAP90. "Results are provided from finite element analyses of two-dimensional plates subject to out-of-plane loads using SAP90. Convergence analysis was made to ensure the quality of the results." It goes on to say that the slab was...
I am trying to compare results from the finite analysis program RISA-3D to the plate coefficients in "Rectangular Concrete Tanks" published by PCA. All of the results from the RISA run seems to be lower than those listed in the PCA charts. Does anyone have any suggestions about how...
I am wanting to get some opinions on the use of shear keys to increase sliding resistance of retaining walls. <br><br>Does anyone have an opinion on shear key effectiveness.
A tank foundation was poured and the 28 day compressive strength of some of the test cylinders was less than specified. 4000psi concrete was specified and the test cylinder strengths ranged from 2300 psi to 3500psi. How concerned should the owner be? What action...
I have two W8x18 beams that are approx. 14.5' in length. The beams are bearing in a brick wall at one end and are sitting on a 8"x8" bearing pad on a column at the other end. The beams are 21' apart. A 12x24 enclosure has been placed on the two...
Ron, Everything you said makes sense to me. However, I have several sets of structural drawings from different firms and all have slab thicknesses of 12" up 24". And they are reinforced using Fig 2.5 from ACI 350. What are they doing? Could...
How is the tank slab thickness determined? The reinforcing is typically based on the thickness of the slab and I have been able to find references on designing reinforcing for slabs on grade, but nothing on the selection of thickness for the uniform hydraulic loading in a tank.<br>
Can anyone offer any advise on wall type selection? Is there a book on the market that discusses the pros and cons of the various wall types and when one type would be used over the other. When do you rule out cast in place walls?
