First of all, I do not have a permanent address at Toyota so I use
the e-mail of my partner, Francis Ang.
Anyway, I know Stella Sabiniano and Rannie Ison. Rannie and Boss
Nick have left EHSEC for good. The last time I saw Rannie in EHSEC, that was
his last day I think. Stella left for US a few months ago. The combination
of Rannie, EHS and Nick was good. But that was then. I used to work at
EHSEC, with Rannie, Stella and Nick.
With regards to the building that I'm designing, I could be a little
confused with the tie spacing. I checked it against the actual shear that is
accompanying it and the results were pretty safe / conservative.
Don't worry with the application of EQ forces. I really design for
EQ running in both directions. When I was in EHSEC before, I used to design
lateral load acting in both directions but with a factor (say x 0.5 y 0.5).
With regards to the bar size, is there a structural implication
between 20mm and 25 mm bar size ? I know that using 25-mm bars would limit
the number of bars in the column and would provide an ample amount of rebar
spacing. What is your comment on this ? Using similar sizes for the column
rebars is a good thing for construction purposes. Sometimes, in ordering,
installation and splicing, they would provide economy.
I just need a little confirmation on things. Sometimes, other's
small opinion could be a big help. Thanks very much.
> From: Jerome.Tan(--nospam--at)fluordaniel.com[SMTP:Jerome.Tan(--nospam--at)fluordaniel.com]
> Sent: Thursday, June 10, 1999 4:12 AM
> To: Francis.Ang(--nospam--at)toyota.com.ph
> Subject: Re: 4-storey design
> I both know Apeng and Mayo. You might be familiar with Rannie and
> Stella, too.
> See yor ACI 318-95 Chapter 21. That should help you.
> And where in the code did you see the 150 mm limitation? Even if it
> does says so, this is only limited to where shear reinforcement is
> required. Where shear is effectively resisted by concrete you can go
> beyond the limit. For your girders and columns which are collectors
> follow ACI 318-95 ch. 21. Remember, read the codes and see what
> particular regions the limitations are required.
> See ch. 21.3.3 to 220.127.116.11 and 21.4.4 to 18.104.22.168.
> As for your column, I believe it looks Ok. but I would prefer having
> square. Who says eqk comes in the E-W direction only? A 400 x 400 or
> 450 x 450 looks fine. check your reinforcements. I would expect 25's
> there not 20's. If you like 20's, provide so from 2nd floor level
> upwards, not on the footing to 2ndf levels.
> I was at Parsons before when i communicated with you earlier. Now I
> with Fluor Daniel.
> Hope this helps.
> ______________________________ Reply Separator
> Subject: 4-storey design
> Author: Francis.Ang(--nospam--at)toyota.com.ph at fdinet
> Date: 6/9/99 7:50 AM
> Dear Sir,
> Right now, I'm involve in a design of a 4-storey residential
> structure. The east-west bays are in 3.2-2.5-3.2m center to center column
> dist. and the north-south are in 5-4.24m spacing. The design was done in a
> fast manner with due care. I got a column of 500 x 350mm for the center
> p-ost with 12-20mm. The architect said this was really large. I tried to
> argue that the large column size was due to the large load it would carry
> (like the water tank @ the rooftop, stairs with 125mm thick slab) and it
> would carry much of the EQ forces since the 500mm dimension is along the
> east-west direction. They said that for a seven storey building, they were
> only getting a 500x500 column.
> I tried to review my loadings. I computed the weight W with
> accuracy. I also assumed that the 800 gallons of water located at the
> rooftop would add to the earthquake force.
> Am I right on my assumptions? Also, I computed the tie spacing as
> per ACI / NSCP Seismic provision. For the confinement region, I'm getting
> 50-mm tie spacing (10-mm bar). I am confused on the spacing of the ties /
> hoops outside the confinement region. Code provision says it should not be
> greater than 150 mm. Don't you think this is to conservative? I specified
> 200mm spacing of ties.
> I hope you could guide me on this. An EQ struck my country
> at Agusan in Mindanao. I don't want my designs to fail in anyway even if
> lives are lost.
> By the way, I lost much of guidance from my bosses since Nick and
> Boss Apeng have parted ways. I feel like it's all by myself now not like
> before when I was in the consultancy office.
> Allan Yango