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Research 5 - About Earthquake Proposals
BS in Civil Engineering (BSCE 2002)
Jose Maria College
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Michael Angelo D. Belarma CES 411S – Earthquake Engineering Research 5
Earthquake Load Analysis:
Introduction to NSCP 2010 Specifications – Design Basis
208.4 Basis for Design
The procedures and the limitations for the design of structures shall be determined considering seismic zoning, site characteristics, occupancy, configuration, structural system and height in accordance with this section. Structures shall be designed with adequate strength to withstand the lateral displacements induced by the Design Basis Ground Motion, considering the inelastic response of the structure and the inherent redundancy, overstrength and ductility of the lateral force-resisting system.
The minimum design strength shall be based on the Design Seismic Forces determined in accordance with the static lateral force procedure of Section 208, except as modified by Section 208.6.
Where strength design is used, the load combinations of Section 203 shall apply. Where Allowable Stress Design is used, the load combinations of Section 203. shall apply.
Allowable Stress Design may be used to evaluate sliding or overturning at the soil-structure interface regardless of the design approach used in the design of the structure, provided load combinations of Section 203 are utilized.
SECTION 502 DESIGN REQUIREMENTS
502 Design Basis
502.3 Required Strength
The required strength of structural members and connections shall be determined by structural analysis for the appropriate load combinations as stipulated in Section 502.
Design by elastic, inelastic or plastic analysis is permitted. Provisions for inelastic and plastic analysis are as stipulated in Appendix 1, Inelastic Analysis and Design. The provisions for moment redistribution in continuous beams in Appendix A, Section A-1. are permitted for elastic analysis only.
502.3 Limit States
Design shall be based on the principle that no applicable strength or serviceability limit state shall be exceeded when the structure is subjected to all appropriate load combinations.
502.3 Design for Strength Using Load and Resistance Factor Design (LRFD)
Design according to the provisions for Load and Resistance Factor Design (LRFD) satisfies the requirements of this Specification when the design strength of each structural component equals or exceeds the required strength determined on the basis of the LRFD load combinations. All provisions of this Specification, except for those in Section 502.3, shall apply.
502.3 Design for Strength Using Allowable Strength Design (ASD)
Design according to the provisions for Allowable Strength Design (ASD) satisfies the requirements of this Specification when the allowable strength of each structural component equals or exceeds the required strength determined on the basis of the ASD load combinations. All provisions of this Specification, except those of Section 502.3, shall apply.
502.3 Design for Ponding
The roof system shall be investigated through structural analysis to assure adequate strength and stability under ponding conditions, unless the roof surface is provided with a slope of 20 mm per meter or greater toward points of free drainage or an adequate system of drainage is provided to prevent the accumulation of water.
502.3 Design for Fatigue
Fatigue shall be considered in accordance with Appendix A-3, Design for Fatigue, for members and their connections subject to repeated loading. Fatigue need not be considered for seismic effects or for the effects of wind loading on normal building lateral load resisting systems and building enclosure components.
502.3 Design for Fire Conditions
Two methods of design for fire conditions are provided in Appendix A-4, Structural Design for Fire Conditions: Qualification Testing and Engineering Analysis. Compliance with the fire protection requirements in this code shall be deemed to satisfy the requirements of this section and Appendix A-4.
Nothing in this section is intended to create or imply a contractual requirement for the engineer-of-record responsible for the structural design or any other member of the design team.
502.3 Design for Corrosion Effects
Where corrosion may impair the strength or serviceability of a structure, structural components shall be designed to tolerate corrosion or shall be protected against corrosion.
502.3 Design Wall Thickness for HSS
The design wall thickness, t, shall be used in calculations involving the wall thickness of hollow structural sections (HSS). The design wall thickness, t, shall be taken equal to 0 times the nominal wall thickness for electricresistancewelded (ERW) HSS and equal to the nominal thickness for submerged-arc-welded (SAW) HSS.
502.3 Gross and Net Area Determination
- Overstrength and strain hardening or softening,
- Strength and stiffness degradation,
- Energy dissipation characteristics,
- System ductility, and
- Redundancy.
208.4.9 Irregular Features
All structures having irregular features described in Table 208-9 or 208-10 shall be designed to meet the additional requirements of those sections referenced in the tables.
208 Site Categorization Procedure
208.10 Scope
This section describes the procedure for determining Soil Profile Types SA through SF as defined in Table 208-2.
Research 5 - About Earthquake Proposals
Course: BS in Civil Engineering (BSCE 2002)
University: Jose Maria College
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