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Hi, I'm designing a wall for a tank and would like to know if anyone has a copy of "Moments and Reactions for Rectangular Plates" from the Bureau Reclamation. The relevant sheet would be the one with the triagular distributed load. Much appreciated.

Hi, I need to get some reference material quickly on the design of water retaining structures. I'm designing a small water tank. Can anyone direct me to online sources? ACI 350 or any publications etc. More specifically, are there limitations for crack widths by limiting reinforcing spacing...

Hi, A contractor damaged a r/c retaining wall and had to have to wall demolished and repaired. In order to save time he cut the rebard but cut it about 1 foot above the footing and as such the required lap lenghts can no longer be satisfied. I've already checked As provided versus As required...

Hi, I have a surveyor who is doing a topographic survey of about 200 acres of land. The land is not flat and has several undulations. The surveyor has generated a topographic map with 1m contour survey using a grid of spot heights of at 10-15 meter spacings. My question is whether this...

Hi Just a few questions on compaction. Is there any correlation between Impact Value (determined by site testing using a Clegg Hammer) and Density? What are the methods used to determine whether compaction has attained 95% or 100% modified density. What is the best way of determining if the...

Hi, I have a short timber bridge which is 10'0" long x 8'-0" wide. The architect wants a concrete abutment at one end and diagonal braces from the bottom of the concrete abutment to support the other end of the bridge. We would like to keep the bridge independent from the existing structure...

Hi I'm working with an architect who wants to design a canopy over a pool deck to provide shade. The canopy which will be made out of a canvas type material will span about 13m between steel poles which will act a support. The canopy will have a slight slope to allow water to sheet off but we...

Hi, Does anybody use, as a rule of thumb, a maximum slenderness ratio for concrete columns even though structurally a slender column can work? Thanks

Hi, I have a three storey structure with the primary load resisting system being a reinforced concrete frame. I do have masonry infill and herein lies the question. At exterior wall locations, how do I detail the masonry wall connection to the R/C beams such that it can transfer wind loads to...

Hi, Would just like to get some feedback on the plumbness tolerances that are generally accepted for driven piles. Thanks.

Hi, I did a detail for a structure which requires piles. I believe I did the conventional detail which has the grade beams sitting on the top of the pile cap. Due to certain site constraints, the contractor has asked be to consider a detail with the grade beam framing into the pile cap. Any...

Hi I have a situation with a house being constructed on a hillside. The front foundation wall will be 10 feet above the ground and we will be filling behind this wall. The fill is not to be compacted and will serve as the formwork for the floor slab which will restrain the top of the wall. My...

Hi I have a situation where a recently poured suspended slab has some severe cracking in my opinion. The cracks are fairly long and straigt and generally intersect perpendicular to each other. There are however some cracks which are random is length and direction. Some of the larger cracks I...

Hi, I have a situation where a concrete beam has been poured without the specified cover for reinforcing steel stirrups on one side. I have checked shear and torsion and one leg of the ties would be sufficient. Can one consider rendering the beam with a 3:1 sand:concrete mortar to provide the...

Hi, I have a situation with a structure which has three bays of one way spanning structural slabs. One of the end bays has received consistently low compressive strengths based on results (12 MPa) and as such we have instructed the contractor to demolish the slab. The contractor has confirmed...

Hi I have a detail where a concrete beam supports a slab on either side. On one side, the slab sits on top the beam (conventional) and on the other side site at the bottom of the beam (like an upstand beam). The difference is slab levels is about 18" so I don't think that the contractor can...

Hi, I keep seeing essentially the same detail for a stepped strip footing which indicates for a vertical step of x, there needs to be a horizontal component of 2x. Shouldn't there be a limit how much of a step you can have. And having said that, how would you treat a strip footing on a hillside...

Hi, Can anyone give me some assistance in designing a slab on three sides? I have a 7'-0"x15'-0" balcony and the architect does not want to have a front edge beam. I can either design as a cantilevered slab however I would like to keep the slab thickness to 6". I was considering cantilevering...

Hi Are there any rules of thumb for the design of switchbacks (some may know it as hairpin bends) up steep slopes. I have a road which has a gradient of 17% and need to design a switchback. What would be the recommended minimum/maximum for the following 1. Radius 2. Road cross section...

Hi Are there any rules of thumb for the design of switchbacks (some may know it as hairpin bends) up steep slopes. I have a road which has a gradient of 17% and need to design a switchback. What would be the recommended minimum for the following 1. Radius 2. Road cross section gradient...