## Reduce Negative Coefficient 10%

## Reduce Negative Coefficient 10%

(OP)

If a negative coefficient is reduced 10%, does the number become larger or smaller. For example, if -1.0 is reduced 10%, does it become -1.1 or -0.9? In other words, is the magnitude reduced or numeric value reduced?

The context is a footnote in ASCE 7-10 Minimum Design Loads for Buildings and Other Structures figure 30.4-1 (or ASCE 7-05 figure 6-11A) that states: "Values of GC

Figure 30.4-1 is used to calculate wind loads and the coefficient can be positive or negative.

The context is a footnote in ASCE 7-10 Minimum Design Loads for Buildings and Other Structures figure 30.4-1 (or ASCE 7-05 figure 6-11A) that states: "Values of GC

_{p}for walls shall be reduced by 10% when θ ≤ 10°"Figure 30.4-1 is used to calculate wind loads and the coefficient can be positive or negative.

## RE: Reduce Negative Coefficient 10%

NX 7.5.5.4 with Teamcenter 8 on win7 64

Intel Xeon @3.2GHz

8GB RAM

Nvidia Quadro 2000

## RE: Reduce Negative Coefficient 10%

And the answer: “"Values of GCp for walls shall be reduced by 10%”

## RE: Reduce Negative Coefficient 10%

f-d

¡papá gordo ain’t no madre flaca!

## RE: Reduce Negative Coefficient 10%

How much to subtract? 10%

10% --> 0.1

-1.0*0.1=-0.1

-1.0 reduced by -0.1

-1.0 - (-0.1) = -0.9

Having gone through that exercise, codes need to be clear, precise and unambiguous. This language is not.

## RE: Reduce Negative Coefficient 10%

Technically, 'reduced' means 'made smaller', not lower.

A large negative number is still large.

A small number is closer to 0, either positive or negative.

That said, in the original, the coefficient itself is not negative, and the language refers to making the coefficient smaller.

## RE: Reduce Negative Coefficient 10%

## RE: Reduce Negative Coefficient 10%

1) does it refer to the magnitude ? (ie get closer to zero)

2) does it refer the numerical value (so a -ve number would get more negative)

if you're dealing with a code, then i'd ask around for the generally accepted interpretation.

Quando Omni Flunkus Moritati

## RE: Reduce Negative Coefficient 10%

David Simpson, PE

MuleShoe Engineering

"Belief" is the acceptance of an hypotheses in the absence of data.

"Prejudice" is having an opinion not supported by the preponderance of the data.

"Knowledge" is only found through the accumulation and analysis of data.

The plural of anecdote is not "data"

## RE: Reduce Negative Coefficient 10%

by10%".If a negative coefficient is reduced 10% ==> NC - 10%

If a negative coefficient is reduced by 10% ==> NC * 0.9

Good Luck

--------------

As a circle of light increases so does the circumference of darkness around it. - Albert Einstein## RE: Reduce Negative Coefficient 10%

No there isn't.

If a negative coefficient is reduced 10% ==> NC - 10% Expressed properly is NC - (NC * 0.1) --> NC * (1-0.1) --> NC * 0.9

## RE: Reduce Negative Coefficient 10%

So if negative coefficient is "reduced" by 10%, it should be NC x 0.9.

## RE: Reduce Negative Coefficient 10%

f-d

¡papá gordo ain’t no madre flaca!

## RE: Reduce Negative Coefficient 10%