Download The Analysis of Irregular Shaped Structures Diaphragms and Shear Walls PDF

TitleThe Analysis of Irregular Shaped Structures Diaphragms and Shear Walls
PublisherMcGraw-Hill Professional
ISBN 139780071763837
Author
LanguageEnglish
File Size48.4 MB
Total Pages577
Table of Contents
                            Contents
Preface
Nomenclature
1 Code Sections and Analysis
	1.1 Introduction
	1.2 IBC 2009 Code Sections Referencing Wind and Seismic
	1.3 ASCE 7-05 Sections Referencing Seismic
	1.4 AF&PA-SDPWS 2008 Sections Referencing Wind and Seismic
	1.5 Complete Load Paths
	1.6 Methods of Analysis
	1.7 References Containing Analysis Methods for Complex Diaphragms and Shear Walls
	1.8 References
2 Diaphragm Basics
	2.1 Introduction
	2.2 The Basic Lateral-Force-Resisting System
	2.3 Load Distribution into a Diaphragm
	2.4 Diaphragm Boundary Elements
	2.5 Drag Struts and Collectors
	2.6 Chord and Strut Discontinuities
	2.7 Subdiaphragms
	2.8 Introduction to Transfer Diaphragms
	2.9 References
3 Diaphragms With End Horizontal Offsets
	3.1 Introduction
	3.2 Method of Analysis
	3.3 Diaphragm Deflection
	3.4 Single Offset Diaphragms
	3.5 Double Offset Diaphragms
	3.6 References
4 Diaphragms With Intermediate Offsets
	4.1 Introduction
	4.2 Intermediate Offset, Transverse Loading
	4.3 Optional Layouts
	4.4 Diaphragm Deflections
	4.5 Intermediate Offset, Longitudinal Loading
	4.6 Diaphragms With Offsets at the End Wall
	4.7 References
5 Diaphragms With Openings
	5.1 Introduction
	5.2 Method of Analysis
	5.3 Single Opening in Diaphragm
	5.4 Diaphragm Deflection
	5.5 References
6 Open Front and Cantilever Diaphragms
	6.1 Introduction
	6.2 Open Front One Side
	6.3 Diaphragm Deflection
	6.4 Open Front Both Sides
	6.5 Cantilever Diaphragm One Side
	6.6 References
7 Diaphragms With Vertical Offsets
	7.1 Introduction
	7.2 Method of Analysis
	7.3 Single Vertical Offset in Diaphragm
	7.4 Multiple Vertical Offsets in Diaphragm
	7.5 Alternate Configurations
	7.6 References
8 Complex Diaphragms With Combined Openings and Offsets
	8.1 Introduction
	8.2 Loads and Load Paths
	8.3 Analysis in the Transverse Direction
	8.4 Analysis in the Longitudinal Direction
	8.5 Alternate Layouts
9 Standard Shear Walls
	9.1 Introduction
	9.2 Shear Wall Basics—Standard and Sloped Walls
	9.3 Hold-Down Anchors and Boundary Members
	9.4 Shear Wall Sheathing Combinations
	9.5 Shear Wall Aspect Ratios
	9.6 Shear Wall Rigidity
	9.7 Multistory Shear Wall Analysis
	9.8 Interior Shear Walls
	9.9 Shear Wall and Foundation Issues
	9.10 References
10 Shear Walls With Openings
	10.1 Introduction
	10.2 Perforated Shear Walls
	10.3 Shear Walls With Force Transfer Around an Opening
	10.4 Shear Walls With Openings—The Cantilever Method
	10.5 References
11 Discontinuous Shear Walls
	11.1 Introduction
	11.2 In-Plane Offset Shear Walls
	11.3 Vertically Discontinuous Shear Walls
	11.4 References
12 Horizontally Offset Shear Walls
	12.1 Introduction
	12.2 In-Line, Out-of-Line Shear Wall Layouts
	12.3 Offset Walls in the Same Line of Resistance
	12.4 Offset Walls Not in the Same Line of Resistance
13 The Portal Frame
	13.1 Introduction
	13.2 Testing and Research
	13.3 Foundation Issues and Inflection Points
	13.4 Force Transfer Around an Opening Method
	13.5 Alternate Frame Systems
	13.6 References
14 Rigid Moment-Resisting Frame Walls: The Frame Method of Analysis
	14.1 Introduction
	14.2 Method of Analysis
	14.3 Composite Glued Sections
	14.4 Design of Wall Members
	14.5 Nailed-Only Partially Composite Sections
	14.6 The Portal Frame Wall
	14.7 Frames Utilizing Glu-lam Beam Members
	14.8 Special Wall Configurations
	14.9 References
Bibliography
Index
	A
	B
	C
	D
	E
	F
	G
	H
	I
	K
	L
	M
	N
	O
	P
	R
	S
	T
	U
	V
	W
                        
Document Text Contents
Page 2

The Analysis of
Irregular Shaped

Structures

Page 288

D i a p h r a g m s W i t h V e r t i c a l O f f s e t s

attention should be paid to the two-story columns and the connections of the low roof
to the columns.

Example 7.3: Vertical Offset Diaphragm, Raised Center Section
The structure shown in Fig. 7.30 has a vertically offset section located in the center of
the diaphragm, offset horizontally to the left. The configuration allows for a clerestory
on each side of the pop-up section. The structure is 280 ft long by 80 ft wide. The

Figure 7.29 Mode 4—diaphragms rotate in the opposite direction.

Figure 7.30 Vertically offset diaphragm, raised center section.

Page 289

264 C h a p t e r S e v e n

Figure 7.31 Building section.

exterior walls are constructed with full-height studs, which produce higher uniform
loads to the diaphragm at the center section than at the sections with lower walls.
Figures 7.31 and 7.32 show ordinary concentric braced frames (OCBFs) located in the
longitudinal direction between grid lines 2 and 3, which also serve as transfer frames
for the disrupted diaphragm chords. Chord and drag strut configurations and locations
can also be seen in Figs. 7.31 and 7.32. Even though the low roof sections meet allowable
aspect ratios for open front diaphragms, longitudinal walls or frames do not exist in
either of the low roof sections that can resist rotation. Therefore, the diaphragm must
be designed as a single-span diaphragm with multiple disruptions in the chords. The
low roof drag or chord elements consist of wood or steel beams. The high roof drag or
chord members are the top beams of the frames plus a preengineered steel truss. The
maximum drag or chord force applied to this truss must be called out on the drawings
for the truss manufacturer. Construction of the shear diagram can be seen in Fig. 7.32,
which is determined as follows:

R1 0 15 50 25 0 2 200 150 0 15 30 265= + +[ . ( )( ) . ( )( ) . ( )( ))] .
1

280
26 357= k

v
R
D1

1 26 357
80

329 5= = = +
,

. plf diaphragm shear aat grid line 1

R4 0 15 30 15 0 2 200 130 0 15 50 255= + +[ . ( )( ) . ( )( ) . ( )( ))] .
1

280
25 643= k

v
R
D4

4 25 643
80

325= =


= −
,

plf diaphragm shear att grid line 4

V R
wx

2 1

2

2
26 375 0 15 30 21 857= − = − =. . ( ) . k shear att grid line 2

v
V
D2

2 21 857
80

273 2= = = +
,

. plf diaphragm shear aat grid line 2

Similer Documents