Earthquake Performance Assessment and Structural Verification
Turkey is located in a highly active seismic region, making seismic analysis and earthquake performance assessment essential components of structural engineering projects.
For industrial facilities, steel structures, machine foundations, and equipment-supporting systems, a properly conducted earthquake analysis is not only a regulatory requirement but also a strategic investment decision to ensure operational continuity and structural reliability.
In this article, we explain the main types of seismic analysis, the applied numerical methods, and key technical considerations for industrial projects.
What Is Seismic (Earthquake) Analysis?
Seismic analysis is the evaluation of how a structure behaves under earthquake loading using engineering calculations and advanced numerical simulations.
The primary objectives are:
In Turkey, seismic projects are primarily conducted in accordance with the Türkiye Bina Deprem Yönetmeliği 2018 (TBDY 2018 – Turkish Seismic Code 2018).
Types of Seismic Analysis
Seismic analyses are generally categorized into two main groups:
1️⃣ Linear Seismic Analysis
In linear analysis methods, structural elements are assumed to remain within the elastic range.
• Equivalent Static Method
Used for regular and relatively simple structures. Earthquake effects are represented as equivalent static lateral forces.
• Response Spectrum Analysis (Modal Superposition Method)
Preferred for multi-story or complex structures. Structural vibration modes are calculated, and seismic effects are derived from response spectra.
2️⃣ Nonlinear Seismic Performance Analysis
Nonlinear methods are critical for performance-based design, existing structure assessment, and strengthening projects.
• Pushover Analysis (Nonlinear Static Analysis)
The structure is gradually pushed laterally to obtain a capacity curve. Collapse mechanisms and plastic hinge formations are evaluated.
• Nonlinear Time History Analysis
Real earthquake records are applied to the structural model in the time domain. The structure’s behavior is evaluated step-by-step during the seismic event.
These methods are widely used for:
Seismic Analysis for Industrial Facilities
Seismic analysis of industrial structures differs significantly from residential buildings.
Critical components include:
In industrial applications, not only the main building but also:
must be carefully evaluated.
This is particularly important in facilities where operational downtime leads to significant financial losses.
Numerical Methods Used in Seismic Analysis
Modern seismic analysis is conducted using advanced Finite Element Analysis (FEA) tools.
Key technical approaches include:
For industrial projects, the objective often goes beyond code compliance and focuses on:
Seismic Performance Assessment of Existing Structures
One of the most demanded services in industrial projects is the seismic evaluation of existing structures.
This includes:
The result is a data-driven engineering decision process that reduces unnecessary interventions and optimizes investment costs.
Why Is Seismic Analysis Critical?
✔ Code compliance
✔ Life safety
✔ Operational continuity
✔ Investment protection
✔ Insurance and risk assessment
✔ Engineering validation
In industrial and steel construction projects, a properly executed seismic performance analysis significantly reduces structural and financial risks.
What to Consider When Choosing a Seismic Analysis Service?
Seismic analysis is not merely a calculation—it is a comprehensive engineering verification process.
Whether for:
a rigorous, standards-based and simulation-driven approach is essential for structural safety and long-term reliability.