Recent content by m63

Would anybody have PCA 'Circular Concrete Tanks Without Prestressing' publication handy to give me a formula for wall thickness calkulation?? Thanks.

Thank you all for your input. Seems there is no widely accepted role for floor joist orientation.

Hi, Is there a role of thumb for orientation of wood joists in tree storey building? I am thinking that floor joists oriented parallel with roof trusses makes sense from a lateral load resisting point and this orientation usually requires less load bearing walls but usually see them oriented...

I've had this thread in 'structural engineering other topics', but no replies. I hope for better response in this forum: Am I right thinking that one place in Canada belongs to two different seismic zones if it has different Za and Zv values? And than, how and when would you differentiate in...

Am I right thinking that one place in Canada can be in two different seismic zones according to Za/Zv values? And than how and when would you differentiate in practice, what seismic zone would you assign to Ottawa for example(Za=4, Zv=2)?

I'm looking for screw fastener to be used in non-structural application of 3/4" plywood on top of 1-1/2", 20 gauge steel deck. A brand name, designation and other info would be appreciated.

What would be the best way to reinforce existing 2x12@16 c/c roof joists for additional point loads since only way to double the joist would be to install second ply in two shorter lengths (installation of full length joist is space restricted)? Could it be still considered as a built-up beam...

I was checking an old concrete slab for a heavier loading and found that the slab was well over designed at the time and very suitable for new loads. This’s got me thinking of the new limit state designs that structural engineers perform nowadays. What are margins of safety that you guys allow...

Thank you all for grate inputs. I’ll do it in staad but will probably get the book too.

thank you both for your inputs. jike, would STAAD be a good FEM program? jec67, is book helpful enough so I wouldn't need to use FEM program, does it have examples, aids or it is theoretical only?

What is acceptable method to design two way slab for a concentrated load? Slab is 12'x15' continuous, with reinforced concrete walls along 12' span and concrete beams along 15' span. Does anybody have a good method of distributing a point load to two spans and any other suggestions would be...

How can existence of pressure relieve valves in floor of underground concrete tank be taken into account to lessen influence of high water table on walls of a tank? Should walls be designed for hydrostatic pressure of max WT anyway?

Makes good sense since even 3" or more of rebar cover would be lost mostly to depressed key itself and wouldn't allow for waterstop placement. But, how do you build curb monolithically with slab? I'm thinking that it would be the way to build raised key too. Thanks for your input.

PCA publication 'Rectangular Concrete Tanks' calls for 'Upturned Key' between slab and wall as well as at construction joints. Can someone comment on reasoning for raised keys, could it be for better location of waterstop (higher above the plane of actual joint) or there are other reasons? Is it...

You can go to http://www.peo.on.ca/ to find out more about licensing and registration in Ontario for your particular case. Also here are some of the Canadian codes that you should get familiar with if you are going to practice structural engineering: A23.3 -Design of Concrete Structures...