Structures: Part 2, Commentary To Asce/sei 7-05 ...................................................................... 101

2009 NEHRP RECOMMENDED SEISMIC PROVISIONS FOR NEW BUILDINGS AND OTHER
STRUCTURES: PART 2, COMMENTARY TO ASCE/SEI 7-05 ...................................................................... 101
Commentary to Chapter 11, Seismic Design Criteria

C11.1 General ..................................................................................................................................................... 103
C11.1.1 Purpose ......................................................................................................................................... 103
C11.1.2 Scope ............................................................................................................................................ 103
C11.1.4 Alternate Materials and Alternate Means and Methods of Construction ...................................... 103
C11.4 Seismic Ground Motion Values .................................................................................................................. 104
C11.4.1 Mapped Acceleration Parameters ................................................................................................. 104
C11.4.3 and C11.4.4 Site Coefficient and Adjusted Acceleration Parameters ........................................... 104
C11.4.5 Design Response Spectrum .......................................................................................................... 105
C11.4.7 Site-Specific Ground Motion Procedures ..................................................................................... 105
C11.5 Importance Factor and Occupancy Category .............................................................................................. 105
C11.5.1 Importance Factor ......................................................................................................................... 106
C11.5.2 Protected Access for Category IV Structures ............................................................................... 106
C11.6 Seismic Design Categories .......................................................................................................................... 107
C11.7 Design Requirements for Seismic Design Category A................................................................................ 108
C11.8 Geologic Hazards and Geotechnical Investigation ...................................................................................... 109
C11.8.1 Site Limitation for Seismic Design Categories E And F ............................................................... 109
C11.8.3 Additional Geotechnical Investigation Report Requirements for123
Seismic Design Categories D through F ...................................................................................... 109
References ..................................................................................................................................................... 109
Commentary to Chapter 12, Seismic Design Requirements for Building Structures

C12.1 Structural Design Basis ............................................................................................................................... 111
C12.1.1 Basic Requirements...................................................................................................................... 111
C12.1.2 Member Design, Connection Design, and Deformation Limit ..................................................... 113
C12.1.3 Continuous Load Path and Interconnection .................................................................................. 114
C12.1.4 Connection to Supports ................................................................................................................. 114
C12.1.5 Foundation Design ........................................................................................................................ 114
C12.1.6 Material Design and Detailing Requirements ............................................................................... 114
C12.2 Structural System Selection......................................................................................................................... 114
C12.2.1 Selection and Limitations ............................................................................................................. 114
C12.2.2 Combinations of Framing Systems in Different Directions .......................................................... 116
C12.2.3 Combinations of Framing Systems in the Same Direction ........................................................... 116
C12.2.4 Combination of Framing Detailing Requirements ........................................................................ 116
C12.2.5 System Specific Requirements ..................................................................................................... 116
C12.3 Diaphragm Flexibility, Configuration Irregularities, and Redundancy ....................................................... 117
C12.3.1 Diaphragm Flexibility ................................................................................................................... 117
C12.3.2 Irregular and Regular Classification ............................................................................................. 118
C12.3.3 Limitations and Additional Requirements for Systems with Structural Irregularities .................. 119
C12.3.4 Redundancy .................................................................................................................................. 121
C12.4 Seismic Load Effects and Combinations ..................................................................................................... 123
C12.4.1 Applicability ................................................................................................................................. 123
C12.4.2 Seismic Load Effect ...................................................................................................................... 123
C12.4.3 Seismic Load Effect Including Overstrength Factor ..................................................................... 123
C12.4.4 Minimum Upward Force For Horizontal Cantilevers for
Seismic Design Categories D Through F .................................................................................... 123
C12.5 Direction of Loading ................................................................................................................................... 124
C12.6 Analysis Selection Procedure ...................................................................................................................... 124
C12.7 Modeling Criteria ........................................................................................................................................ 124
C12.7.1 Foundation Modeling.................................................................................................................... 124
ix

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Structures: Part 2, Commentary To Asce/sei 7-05 ...................................................................... 101

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2009 NEHRP RECOMMENDED SEISMIC PROVISIONS FOR NEW BUILDINGS AND OTHER

STRUCTURES: PART 2, COMMENTARY TO ASCE/SEI 7-05 ...................................................................... 101

Commentary to Chapter 11, Seismic Design Criteria

Commentary to Chapter 12, Seismic Design Requirements for Building Structures

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