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Hi Im trying to understand the statics of how this possibly works. 5 axle truck trailer 30m long overall on the show room floor. Self weight of trailer is 25 tonnes. All 5 axle rows (1.8m apart) are hydraulically linked so the centre of reaction is theoretically under the third axle. Trailer...

Hi all I am a not a hvac engineer, but would appreciate some help in understanding something This is in regard to a typical Brisbane 20 storey building with AHU on every floor (each floor has a small mech plant zone and the AHU is inside that room) My question: Are the AHU cooling coils meant...

Hi all. I am reviewing some office AC ducting drawings and had a query regarding the return grille that are typically shown in plan. The office is a mulitstory building with drop-in ceiling tiles. On the plans, i see all the supply air ducts and the direction of airflow feom the AHU. But...

Hi. Hoping for a bit of advice regarding dust sizing for filter selection. It seems as though most specs and literature think of dust as roughly spherical in shape. But In regard to fibrous dust (eg wool batts etc or husk factories) the fibres can be 0.1 micron diameter but the length can be 5...

[img https://res.cloudinary.com/engineering-com/image/upload/v1667631708/tips/PNG_image_ujra7k Hi. I have an issue with a single storey timber framed brick veneer home. No structural issues anywhere. However, There is a random horizontal hairline crack mid height of 1 wall..unexplainable! The...

HI ALL Just a topic of conversation in the office recently, but is anyone able to shed light on what filter standards were applicable for fine filters througout 1980s in Australia?? We dont think a Mserv rating code was used as we think ASHRAE developed it just befor 1990. Any advice...

hi. i have a situation where i need to determine the pressure under a square footprint load applied at the surface of the soil. I am interested in the vertical pressure at roughly 1 to 1.5m beneath the square pad. (using boussinesq soil theory). The square pad is susecptible to vertical load...

Hi All. In regard to a simply supported pretensioned beam (with straight horizontal and fully bonded strands for the purposes of this discussion)...this does appear to be a fundamental question, but is in fact a little more complex…with an understanding of strand strain and concrete strain at...

Hi. For the AS100 steel code, it requires that the ends of compression elements be restrained inplane and restrained out of plane....which is understandable. Normally, the ends of the column are checked to see if there is a load path to resist 2.5% of N* in the out of plane or inplane...

Hi . My apologies for the seemingly silly query, but I have a borelog that identifies traces of "Ash" at around 2 meters depth. The log does not state the strata is fill. In terms of understanding the term..."Ash", is this meant to be a soil geological term , OR, is it literally meaning ash...

hi All I am not a mechanical engineer and work in an office building in Queen street, brisbane. i have a couple of novice questions for my own education... so forgive my ingorance. My questions are related to air handling units (which are located in a plant room, on each floor of the office...

HI all I have an issue i can not resolve in my head regarding AS3700 unreinforced horizontal bending. I have been thru the Thinkbrick manuals and the National Masonry manuals...and whilst they prescribe what to do for designers, they do not provide insight into the origin of the section...

Hi There A concrete suspended ground floor slab (commercial building) is being poured on 150mm cardboard void-formed. The slab has top and bottom reo. So the slab (even though it is a ground slab) is going to be suspended 150mm above the ground once the concrete cures and the cardboard decays...

hi In regard to. cl 10.4.4 of AS3600 and prestressed columns, can anyone provide advice on whether or not the calculation of the real buckling load Nc should have the prestressing force deducted from its value. Afterall, doesn't the prestressing contribute to buckling? thus:'real' Nc = Nc from...

HI - Can anyone assist with copies of Australian standards AS1310-1972 and AS1311-1972. In particular the pagees on Tensile force, area testing Elongation etc... Much appreciated Geopat

hi all. I have an existing waffle slab with 385mm deep x 110mm wide internal ribs. The existing ribs have 1Y16 Top and Bottom. The existing slab is 85mm thick. The drawings show that there is F72 mesh in this slab with 20mm top cover. The edge beam is exactly the same as the internal ribs...

Hi all I have a new warehouse to design. Its about 40m x 40m and is going to have either tilt up walls or block walls. Its going to have steel rafters and purlins also. Its essentially a common plain 4-sided warehouse!! There is an existing nearby building and it is about 2 to 3m away. The...

Hi all I have an issue regarding soil movement and the treatment of new raft slabs that will abutt existing waffle pod (essentially another raft). I have attached a plan. The waffle has an edge detail with only 150mm high nib. The main question is how treat the differential movements. i.e If...

Hi. Just wanted to get some views on a basic suspended reinforced concrete deck that has a high degree of restraint. I have designed the flexure reo to As3600 for service stresses. Then I checked checked this same amount of reo assuming my structure has a high degree of restraint (ie using 0.6%...

Hi I have a query regarding concrete cover, bar chairs and spacer bars made from reo bar. My slab design requires 60mm cover to the bottom main reo. The steel fixer has placed 40mm bar chairs and placed 20mm spacer bar on top of the chair (spacer bar was not part of my design and is non...