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OBJECTIVESAs a result of this session, you should be able
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APRIL 2010
Instructors Workbook Module M4/S1
Description of Building Plan an
Elevation of selected building f
Anal sis
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I n s t r u c t o r s W o r k b o o k
Description of Floor plans and elevation/Discussion of
prevailing Practices Module M4
DESCRIPTION OF FLOOR PLANS ANDELEVATION/ DISCUSSION OF
PREVAILINGPRACTICES
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Description of Floor plans and elevation/Discussion of
prevailing Practices Module M4
CONTENTS
1. Introduction
......................................................................................................
12. The Project
........................................................................................................
13. The Selected Plan of the Building (Prevailing Practices)
............................. 14. Structural Problem with the
Selected Plan ....................................................
65. Modification of plan to make it regular
......................................................... 86.
Structural Benefits after modification of Plan
............................................ 12
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1. INTRODUCTION
This chapter provides you the detail of the selected building
under study. The building
initially selected was with improper configuration and it was
made proper with leastchange in its utilities.
2. THE PROJECT
The sample project is a four and half storey building with three
bays in direction, shorter
and longer dimension of the building in plan are 9.6m and
11.475m respectively. The
supports are fixed at plinth level. The dimensions of beams are
230mmX350mm for the
first trial and Columns are 300mmX300mm.The slab will be a
concrete slab 125mm thick.
3. THE SELECTED PLAN OF THE BUILDING (PREVAILINGPRACTICES)
The plan of the building selected is shown below. Due to its
improper location of column,
it is named as improper configuration building
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4. STRUCTURAL PROBLEM WITH THE SELECTED PLAN
Fig: Grid plan
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There are 4 major discontinuities in frame along grid C, D, E
and 2.
Since the frames along those grids are incomplete, the beam has
to resist the expected
lateral load resulting from the absence of column there.
The beam has to resist biaxial bending moment (torsion).
The ductility in this region cannot be expected and it must be
designed for the R
(response reduction factor) times the incoming forces.
Such joint must be in elastic for extreme lateral loading.
Overall ductility of the structure will be reduced which causes
to decrease the overall
performance of structure.
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5. MODIFICATION OF PLAN TO MAKE IT REGULAR
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6. STRUCTURAL BENEFITS AFTER MODIFICATION OF PLAN
There are no any discontinuities in frame.
The overall ductility of the structure can be insured.
The span is not regular so there will be some torsion in the
structure and must be checked
for the safety.
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UNIT TEST
1) The Ductility of the structure for the irregular building
is
a) Greater b) Lesser c) No change
Ans: b) Lesser
2) The Configuration of the building should be . For best
performance
during Earthquake.
a) Regular b) irregular
Ans: a) Regular
3) Why load path should be complete?
Ans: Load path should be complete so that the all the inertial
forces in the
building is transferred to the foundation properly.
