Seismology committee
Structural Enginers Association of California

TENTATIVE
LATERAL FORCE REQUIREMENTS
October, 1985

SEAOC

CONTENTS
OCTOBER 2, 1985

TABLE OF CONTENTS
RECOMMENDED LATERAL FORCE REQUIREMENTS
OF THE SEAOC SEISMOLOGY COMMITTEE
Page No.
CHAPTER    1-GENERAL REQUIREMENTS FOR THE DESIGN AND   
CONSTRUCTION OF EARTHQUAKE RESISTIVE STRUCTURES   
A.    General    1-1
B.    Definitions    1-2
C.    Symbols and Notations    1-4
D.    Criteria Selection    1-5
    1.    Basis for Design    1-5
    2.    Seismic Zones    1-6
    3.    Site Geology and Soil Characteristics    1-6
    4.    Occupancy Categories    1-6
    5.    Configuration Requirements    1-6
    6.    Structural Systems    1-7
    7.    Height Limits    1-7
    8.    Selection of Lateral Force Procedure    1-8
    9.    Alternate Procedures    1-9
E.    Minimum Design Lateral Forces and   
    Related Effects    1-9
    1.    General    1-9
    2.    Static Force Procedure    1-10
    3.    Combinations of Structural Systems    1-12
    4.    Vertical Distribution of Force    1-13
    5.    Horizontal Distribution of Shear    1-14
    6.    Horizontal Torsional Moments    1-14
    7.    Overturning    1-15
    8.    Story Drift Limitation    1-16
    9.    P-Delta Effects    1-16
    10. Vertical Component of Seismic Forces    1-16
F.    Dynamic Lateral Force Procedure    1-16
    1.    General    1-16
    2.    Ground Motion    1-17
    3.    Mathematical Model    1-17
    4.    Description of Analysis Procedures    1-17
    5.    Response Spectrum Analysis    1-18
    6.    Time History Analysis    1-19
G.    Lateral Force on Elements of Structures and Non-   
    Structural Components Supported By Structures    1-19
H.    Detailed Systems Design Requirements    1-22
    1.    General    1-22
    2.    Structural Framing Systems    1-23
I.    Non-Building Structures    1-28


Page No.
1-31 1-31 1-31 1-31 1-32 1-34
1-35 1-36
J. Foundations
1. General
2. Soil Capacities
3. Structural Materials
4. Detailing Requirements
K. Design and Construction Review
FIGURES
1-A Seismic Zone Map
1-B Response Spectra Shapes
TABLES
1-A Seismic Zone Factor Z
1-B Site Coefficients
1-C Occupancy Categories
1-D Occupancy Requirements
1-E Vertical Structural Irregularities
1-F Plan Structural Irregularities'
1-G Structural Systems
1-H Horizontal Force Factor Cp
1-I R~, Factors for Non-Building Structures
CHAPTER 2 - REINFORCED MASONRY
A. General Requirements
B. Construction Limitations
C. Design Requirements - Reinforcement
1. Reinforced Masonry
2. Reinforced Stacked Bond Construction
D. Design Requirements - Reinforcement Development, Anchorage, and Splices
E. Shear Wall Requirements
CHAPTER 3 - REINFORCED CONCRETE
A. General Requirements
1. Scope
2. Use of Chapter
3. Definitions
B. Modifications to Appendix. A,
General Requirements
C. Flexural Members of Frames
D. Frame Members Subjected to Bending and Axial Loads
E. Structural Walls, Diaphragms, and Trusses
F. Joints of Frames
G. Shear Strength Requirements
H. Frame Members Not Part of the Lateral Force Resisting System
I. Inspection
1-37 1-38 1-39 1-40 1-41 1-42 1-43 1-44 1-45
2-1 2-1 2-1 2-1 2-1
2-1 2-2`
3-1 3-1 3-1 3-1
3-1 3-2
3-2 3-4 3-5 3-5
3-6 3-6
-2-
Page No.
CHAPTER 4 - STEEL CONSTRUCTION
A.    Reference Standards    4-1
B.    Definitions    4-1
C.    Material Specifications    4-2
D.    Strength of Columns    4-2
E.    Ordinary Moment Frame Requirements    4-3
F.    Special Moment-Resisting Space Frame (SMRSF)   
    Requirements    4-3
G.    Requirements for Braced Frames    4-7
H.    Eccentrically Braced Frame (EBF) Requirements    4-10
I.    Inspection    4-12
CHAPTER    5 - WOOD CONSTRUCTION   
A.    General    5-1
B.    Definitions    5-1
C.    Requirements for Wood Design - Seismic Zones   
    3 and 4    5-1
    1.    Requirements for All Wood Shear Walls and   
    and Diaphragms    5-1
    2.    Plywood - Diaphragms and Shear Walls    5-2
    3.    Wood Diaphragms    5-2
    4.    Heavy Wood Panels    5-2
D.    Special Inspection of Wood Construction    5-3
CHAPTER 6 - OTHER MATERIAL
A. General Material Property Requirements    6-1
B. Method of Establishing Design Values for
Materials, Connections, Assemblages, Systems,
Etc.    6-1
C. Other Sheathing    6-2
D. Nonengineered Use of Materials    6-2
-3-

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