If you have a BRAB slab on grade design that is poured monolithically with some of the grade beam exposed on the exterior and the slab exposed on the interior, do you use air-entrained concrete or not? My thought is not to because patching an exterior spall is less of a problem than...
I am reinforcing and an 13' tall unreinforced CMU wall built in the early 60's. The wall was 8" CMU with a flemish course of brick that tied the brick veneer to the wall making the effective depth of the wall 12". We have removed the brick veneer and I have to reinforce the block. I am...
Please see the attached picture and let me know if you recognize the deck profile. This is a roof deck on an approximately 60 year old bulding with foam insulation on top. The deck depth is 1 1/2", center to center of the ribs is 6 1/2", bottom of flute width is 1/2". It looks similar to an...
I have drawings of a building from 1968 that show a girder with designation 24BL55. It is a wide flange beam. The other beams on the project have designations such as 16WF40 which I can find. AISC design guide 15 doesn't show this designation either that I can find. Does anyone have any...
I have a renovation that will use members about 20" long holding up roof loads. I have 3x12 timber as the joists. Does anyone know if using comparable glulam members is more or less expensive? The project is in the southern US.
Does anyone know where I can get historical information for wood to wood face mount hangers? The hangers I am looking at were installed in the late 60's.
I have a simple design of a safety rail being mounted on a roof next to a piece of equipment. The posts of the rail penetrate the roof and will be mounted to the inside face of the masonry bearing wall below. The moment on the rail post will be taken by a masonry anchor at the bottom of the...
I am doing some light structural modifications to steel supporting a roof in a terrarium. Very high humidity. The existing steel is showing surface rust. Nothing that is drastically degrading the steel. I am going to have them clean the visible rust and paint all of the members. Does anyone...
I have a building from the early 60's that has steel joist with metal form deck covered in a light weight concrete used for roof slope with the consistency of masonry grout. In looking at the available capacity of the joist, the current system seems to be overloading the joist capacity. I...
I am looking at a building that has drawings dated in 1960. Some of the framing has designations for "L" joists from the 50's. There are some joist framing members that span about 16'-0" that appear to be designated "12-1056" and "8-1256" spaced at 4'-0". Does anyone know what this framing...
What is the difference between metallic and non-metallic non-shrink grout. I have always seen non-metallic specified. Can anyone give examples of where you would prefer either?
I have a one story building in the Houston area where the geotechnical engineer is telling me that they don't want void forms under the grade beams supporting the building because they don't want water to get in the voids. He says to instead to design the grade beams for 1" of uplift.
I have...
I have a job site where the welder was welding the steel (joist seat welds, joist bottom chord to columns) with E7024 mild steel electrodes. We specify E7018 low hydrogen electrodes. I don't have enough of a background in welding knowledge to tell if this is a problem or not. The E7018 are...
I have a job where I specified a 4000 psi concrete for a truck dock slab with slump limits from 5"-7" and 4.5% air entrainment. The testing lab technician is telling me that some of the concrete was placed with a 9 3/4" slump and some was placed with 9% air entrainment. If no superplasticizers...
I have a job that has grout tests at 61% of required strength. I need to have a section of the parapet tested to see if this is the strength of the wall above the roof. Does anyone know if there is an ASTM standard that covers this? I have looked at ASTM C1019 and it does not give specific...
