The frame shown in Figure 5 is unbraced, and bending is about the strong axis of the members. All beams are W18x65 and all columns are W12×65. (a) Determine the effective length factor. Kr. for column AB. Do not use the stiffness reduction factor. (b) Determine the effective length factor, Kx. for column BC. Do not use the stiffness reduction factor. (c) If F, = 50 ksi, is the stiffness reduction factor applicable to these columns?

The frame shown in Figure 5 is unbraced, and bending is about the strong axis of the members. All beams are W18x65 and all columns are W12×65. (a) Determine the effective length factor. Kr. for column AB. Do not use the stiffness reduction factor. (b) Determine the effective length factor, Kx. for column BC. Do not use the stiffness reduction factor. (c) If F, = 50 ksi, is the stiffness reduction factor applicable to these columns?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Methods to Determine Vertical Stress

The load applied to the soil is transferred to the underground. The presence of water at soil pores and solid grains above the soil are the primary components that are responsible for the effective load transfer. Due to the load acting, the internal component of the soil or the underground formations undergoes deformations or a tectonic shift. The amount of deformation depends upon the amount of load acting on the soil surface, which indeed, depends on the weight of everything present above the soil. Due to this, the underground soil element develops internal stresses which try to resist the tectonic changes.

Question

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The frame shown in Figure 5 is unbraced, and bending is about the strong axis of the
members. All beams are W18×65 and all columns are W12x65.
Determine the effective length factor. Kr. for column AB. Do not use the stiffness reduction
factor.
(b) Determine the effective length factor, Kx. for column BC. Do not use the stiffness reduction
factor.
(c) If F, = 50 ksi, is the stiffness reduction factor applicable to these columns?
|++
T
12"
12'
-20'
C
B
Figure 5
20'

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Step 2: Column stiffness equation:

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Step 3: Effective length factor:

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Step 4: Effective length factor:

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Step 5: Slenderness ratio:

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Step 6: The stiffness reduction factor

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