Seismic Code Provisions and Structural Design

These flashcards cover key vocabulary terms and concepts related to seismic code provisions and structural design philosophies.

Seismic Code Provisions

Design standards for structures to protect safety, health, and welfare during seismic events.

Allowable Stress Design (ASD)

A design philosophy where structures are assessed based on allowable factors of safety from previous experiences.

Limit States Design (LRFD)

A design philosophy that uses probability theory to cope with uncertainties in material strength and loads.

Failure of Structure

A condition where a loading exceeds a limit state, causing the structure or component to cease fulfilling its intended function.

Serviceability Limit State

A limit state concerned with the normal performance of a structure under normal service conditions.

Structural Failure Limit State

A critical limit state focused on safety and the maximum load-carrying capacity of a structure.

Load Combinations (ASCE-7)

Specific combinations of loads considered in structural design to ensure safety against failure.

NSCP 2015

The National Structural Code of the Philippines that specifies load combinations and design provisions.

Seismic Force-Resisting System

The system in a structure that provides resistance to seismic forces, such as shear walls or braced frames.

Seismic Load Combinations

Specifies how different loads (gravity and seismic) should interact and be combined in structural design.

Reliability/Redundancy Factor (ρ)

Represents the level of system redundancy and reliability in the design to account for uncertainties.

Near-Source Factor

A coefficient used in seismic design to account for proximity to seismic sources.

Elastic Design Spectrum

The graph that represents the response of a structure to different seismic events derived from its location.

Dynamic Site Response Analysis

An analysis performed to understand how a site's specific characteristics may affect seismic response.

Redundancy in Structural Design

The inclusion of alternate load paths in a structure to enhance its reliability during seismic events.

Earthquake Loads

Lateral and vertical forces applied to a structure during an earthquake, including ground shaking and inertia effects.

Design Spectral Acceleration (SDS)

A measure of the seismic forces affecting a structure that considers soil conditions and building characteristics.

Overstrength Factor (Ω)

A multiplier accounted in design to ensure structures have additional capacity against unforeseen loads.

Building Frame System

A structural system where resistance to gravity loads is provided by a complete space frame.

Special Moment-Resisting Frame (SMRF)

A frame that resists lateral loads primarily through the flexural capacity of its members.

Ordinary Shear Wall Frame System

A system where shear walls provide lateral load resistance, often combined with framing.

Dual Systems in Seismic Design

Structural systems combining multiple types to optimize performance under seismic loads.

Bearing Wall System

A system using walls to support vertical loads without a complete space frame.