Case Study: Wind Load Resistance Analysis of Photovoltaic (PV) Module Mounting Structures

Project Overview

This case study presents a Finite Element Analysis (FEA)–based structural assessment of a Photovoltaic (PV) Module Mounting Structure subjected to design wind loads.
The objective was to verify structural integrity of the support frame, mounting rails, bracing members, and anchorage system under governing wind pressure and uplift conditions.

Wind loads were applied using an equivalent static approach, consistent with internationally recognized wind design standards, to ensure compliance, safety, and long-term reliability of the PV installation.

Applicable Design Standards

The wind load evaluation and structural verification were aligned with the following widely adopted standards:

• IS 875 (Part 3): 2015 – Wind Loads on Structures

• ASCE 7-16 / ASCE 7-22 – Minimum Design Loads for Buildings and Other Structures

• EN 1991-1-4 (Eurocode 1) – Wind Actions

• IEC 61215 / IEC 61730 (reference) – Mechanical load considerations for PV modules

Wind pressure coefficients, exposure categories, gust effects, and load combinations were derived in accordance with these standards.

Objectives of the Study

The primary objective of this case study is to:

• Define design wind pressure and uplift loads acting on PV modules

• Evaluate stress, deformation, and load transfer paths in the mounting structure

• Identify critical wind directions and governing load cases

• Verify structural adequacy and anchorage performance under extreme wind events

Geometry and Structural Model

PV Mounting Structure System

PV Mounting Structure System

• Steel support posts and beams

• PV module mounting rails and clamps

• Bracing members for lateral stability

• Base plates and anchor bolts connected to foundations

• CAD geometry imported directly into the FEA environment

PV modules were represented as pressure-carrying surfaces transferring wind loads into the structural frame.

Wind Load Definition

Design wind pressure was calculated using the standard formulation:

The resulting distributed pressures were applied as equivalent static loads normal to the PV panel surfaces.

Simulation Methodology

Geometry & Meshing

• Solid 3D finite elements used for structural members

• Local mesh refinement at:

  • Base plates

  • Clamp connections

  • Bracing intersections

Load Cases

• Wind acting normal to panel plane (only one load case results shown)

• Wind uplift (suction on rear face)

• Wind acting parallel to PV rows

Boundary Conditions

• Fixed / anchored supports at foundations

• Realistic restraint conditions for structural stability

Solver

• Linear static analysis performed for all wind load cases

Post-Processing and Key Results

Key outputs analyzed include:

• von Mises stress distributions across the mounting structure

• Maximum deflection of rails and support columns

• Identification of stress concentration zones at:

  • Base plates

  • Anchor bolts

  • Clamp and rail connections

Governing Conditions
Wind uplift and normal pressure cases were found to control the structural design.
All stresses and deflections remained within allowable limits per applicable material and design criteria.

Engineering Insights Gained

• Wind uplift often governs PV mounting design more than in-plane pressure

• Anchorage and connection detailing is critical for overall system performance

• Equivalent static wind analysis offers a conservative, code-compliant, and efficient verification approach

Industrial Applications

Photovoltaic Module Mounting Structures

Wind load resistance analysis is critical to ensure the safety and durability of PV mounting systems exposed to open-field or rooftop wind conditions. The methodology verifies structural performance of frames, rails, connections, and anchors under design wind loads.

Ground-Mounted Solar Power Plants

Large-scale solar farms are highly sensitive to wind-induced forces due to panel area and exposure. This analysis approach supports structural optimization and compliance with site-specific wind requirements.

Rooftop Solar Installations

Rooftop PV structures experience complex uplift and pressure effects due to building aerodynamics. Structural verification ensures mounting systems remain secure without excessive deformation or anchor overstress.

Pre-Engineered Solar Support Systems

Prefabricated PV mounting structures benefit from wind load validation to ensure robustness across different geographic wind zones and installation configurations.

Benefits to Industry

• Code-aligned wind load structural assessment

• Identification of governing wind load cases and critical components

• Improved confidence in connection and anchorage design

• Reduced risk of wind-induced damage and long-term service issues

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