Insights
What We’re Learning.
Thoughts, lessons and observations drawn from investigations, design work, site inspections, heritage structures, adaptive reuse projects and engineering practice.
The most valuable lessons often come from buildings that behave differently than expected.
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28 Insights
Forensic Structural Engineer Melbourne: The Balcony Investigation that Changed Everything
What started as a routine balcony waterproofing project quickly turned into something far more complex. After demolition works exposed unexpected cracking and excessive deflection, our investigation uncovered a series of hidden issues that had likely been present for decades. Through slab scanning, concrete core testing, structural analysis and forensic investigation, we discovered that multiple small defects had combined to create a much larger structural concern. This project highlights how forensic engineering often reveals a very different story beneath the surface.
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Cracking in Heritage Masonry Buildings: Why the Obvious Answer Was Wrong
When we were asked to investigate severe cracking in a heritage masonry building in Carlton, the likely cause appeared obvious. A large tree stood nearby, adjacent pavement had moved, a service pit had settled, and the building had already experienced historical footing issues. Everything pointed toward settlement and underpinning. However, a closer inspection told a very different story. This investigation revealed how cracking in heritage buildings can sometimes be caused by brick growth and moisture rather than footing movement, leading to a far simpler and less invasive solution.
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Heritage Structural Engineer Melbourne: Understanding, Preserving and Adapting Existing Buildings
Heritage buildings present unique opportunities and challenges. Whether you're planning renovations, investigating structural concerns, adapting a building for a new use or seeking to preserve an important historic asset, understanding the existing structure is critical. In this article, we explore what a heritage structural engineer does, common structural issues found in heritage buildings, and how specialist engineering advice can help preserve heritage significance while ensuring buildings remain safe, functional and fit for modern use.
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Why Is My Concrete Slab Cracking?: Information for Homeowners and Engineers
Concrete cracks are a normal part of a structure’s life, but not all cracks are created equal. This article explores the most common causes of concrete cracking, including poor drainage, tree root activity, plastic shrinkage, settlement, drying shrinkage, thermal effects, reinforcement corrosion, alkali-silica reaction and structural loading. Learn how engineers assess crack severity, acceptable crack widths, when repairs are required, and the practical steps homeowners, builders and designers can take to improve durability, extend service life and reduce the risk of costly structural damage.
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Why These Apartment Building Cracks Weren't a Footing Problem
When residents began noticing cracks appearing throughout a three-storey apartment building, concerns quickly turned to movement, foundations, and potentially costly repairs. But as we worked our way around the building, the clues told a different story. What initially looked like a significant structural problem turned out to be an excellent example of how brick buildings naturally move over time and what can happen when that movement isn't properly accommodated. In this article, we share what we found, explain the role of articulation joints, and explore why understanding the cause of cracki
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Why a Heritage Roof Doesn't Always Need Replacement After Termite Damage
When we were asked to assess a heritage-listed factory building with extensive termite damage, the assumption was that the entire roof would need replacing. Parts of the roof had already collapsed, making that seem like a reasonable conclusion. However, a detailed structural investigation revealed that much of the damage was highly localised. By carefully mapping what timber was genuinely deteriorated and what could be retained, we developed a targeted remediation strategy that preserved significant heritage fabric while restoring structural integrity.
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Earthquake in Melbourne: Is My Structure or Building Ok?
While Melbourne is not widely known for major earthquakes, seismic events do occur and can raise concerns about building safety. This article explains how buildings respond to earthquakes, the difference between earthquake-proof and earthquake-resistant design, and the factors that influence seismic performance, including building age, materials, weight, flexibility and ground conditions. It also explores liquefaction, the evolution of Australian seismic codes, and why most modern Australian homes are well-suited to withstand earthquake forces while protecting occupant safety.
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3 Reasons Why Your Building Is Making Noise: Creaky Building Syndrome
Creaky Building Syndrome describes the unwanted creaks, groans, pops and ticking noises that can occur when buildings move under wind and other loading conditions. While structural movement is normal, excessive noise often results from three key factors: vortex shedding, friction between structural and non-structural building elements, and excessive building movement. This article explains the engineering science behind noisy buildings, why high-rise structures are particularly susceptible, and the design, detailing and construction strategies used to minimise nuisance noise.
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How can you tell if a Crack is Structural?
When your family home starts to show signs of cracking, it can cause fear and concern. Your home should be a place where you and your family feel safe and secure. So when cracking does appear, it can be hard to know what you should do. So how can you tell if a crack is structural? Also, how can you tell if a crack is serious and requires immediate attention? This article provides some insights into different types of cracking you may find in different parts of your home.
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How Your House on Stumps May Behave Due to Flooding and Floodwater
In October 2022, many parts of country Victoria were affected by severe flooding. Many homeowners are still picking up the pieces left behind from this flooding event to this day. In the aftermath of the cleanup, it has become clear that houses supported by slab foundations have performed superior to those supported by stumps, but why is this the case? This article takes a deep dive into why (no pun intended)…
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Why Do Retaining Walls Fail
Retaining walls are among the most failure-prone structures due to the many forces acting on them. This article explores the most common reasons retaining walls fail, including rotation, sliding, global stability failure, and local member failure. Using L-wall and soldier pile wall examples, it explains how poor drainage, excessive surcharge loads, inadequate soil investigation, insufficient footing or pile embedment, and detailing errors can undermine performance, and outlines the engineering principles used to prevent these failures.
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Vibration Analysis of Slabs Using Ram Concept
Floor vibration is an important serviceability consideration that can affect occupant comfort even when a slab is structurally adequate for strength and deflection. This article explains the fundamentals of vibration, including damping, frequency, resonance and footfall-induced excitation, before demonstrating how to perform vibration analysis of concrete floor slabs using RAM Concept. Learn how to define vibration criteria, model damping and mass effects, assess natural frequencies and mode shapes, and evaluate response factors to ensure floor systems meet performance requirements for offices
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Is Top Reinforcement Required in Isolated Footings
Top reinforcement is generally not required in isolated footings because the top surface remains in compression while the bottom surface resists tension generated by bending. This article explains how isolated footings transfer loads to the supporting soil, examines the structural behaviour that governs reinforcement requirements, and identifies the specific situations where top reinforcement becomes necessary, such as when shear ligatures are required or when moment reversal creates top-face tension. It reviews AS3600 behind omitting top steel in typical footing designs.
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Density of Construction Materials and Construction Elements
Accurate load assessment is fundamental to structural engineering, and material density is a key input in determining dead loads on buildings and infrastructure. The reference guide provides the densities of common construction materials including concrete, steel, timber, masonry, soils and metals, along with the weights of typical construction systems such as roofs, walls, floors and ceilings. Whether performing hand calculations, preliminary design or detailed analysis, these values provide engineers with practical resource for estimating structural loads and evaluating building performance.
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Modelling Cracked Shear Wall Behaviour in ETABS
Concrete cracking significantly influences the stiffness and behaviour of reinforced concrete structures, making accurate modelling essential for reliable structural analysis. This article explains the mechanics of concrete cracking and demonstrates how to model cracked shear wall behaviour in ETABS using stiffness modifiers. It covers the relevant shell element properties, interpretation of wall stresses, identification of cracked regions and application of code-based stiffness reduction factors, helping engineers achieve more realistic predictions of building drift, and load distribution.
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Types of Pile Testing and Why They Are Needed
Pile testing plays a critical role in verifying the strength, serviceability and construction quality of foundation systems that cannot be fully inspected once installed. This article explains the main types of pile testing used on building projects, including static load testing, high-strain dynamic testing, rapid load testing and integrity testing. Learn how each method works, what information it provides, and the advantages and limitations of each approach, helping engineers confirm foundation performance, validate geotechnical assumptions and reduce construction risk.
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How to Check if Your Etabs Model Is Correct
Finite element analysis software such as ETABS is a powerful design tool, but the accuracy of its results depends entirely on the quality of the model inputs and validation process. This article provides a practical framework for checking whether an ETABS model is behaving correctly, including reviewing geometry, material properties, loading, meshing and analysis settings. It also explains how to validate results using deflected shapes, modal behaviour, mass participation and base reactions, helping engineers turn the “black box” into a reliable design tool.
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How Deep and Wide Do Footings Need to Be
The size of a footing depends on far more than a simple rule of thumb. This article explains the key factors that determine how wide and deep footings need to be, including applied loads, soil bearing capacity, footing type, material strength, and seismic considerations. Using a practical isolated pad footing example, it demonstrates how engineers size footings to prevent soil failure, resist overturning forces, and provide adequate structural capacity against shear and punching shear.
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How to Set up Grids in Etabs
Grid systems are a critical part of structural analysis and documentation, providing consistent reference points across architectural and engineering drawings. This article explains how to create, modify, and manage grids in ETABS, including standard grid setup, inclined grids, CAD-based workflows, API-driven automation, and best-practice modelling techniques. It also explores methods for improving efficiency, coordination, model accuracy, and quality assurance when developing structural analysis models.
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What Does Lateral Stability in Buildings Mean
Lateral stability is a building’s ability to resist horizontal forces from wind, earthquakes and other lateral loads without excessive movement or collapse. This article explores the key stability systems used by Structural Engineers, from residential wall bracing and industrial portal frames through to shear walls, lift and stair cores, outriggers and tube systems used in modern skyscrapers. Learn how each system works, where it is best applied and how engineers create a clear load path to safely transfer horizontal forces into a building’s foundations.
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What Is a Post Tensioned Concrete Slab
Post-tensioned concrete slabs use high-strength steel cables to introduce compression into the slab, reducing tensile stresses and allowing longer spans with thinner structural profiles than conventional reinforced concrete. This article explains how post-tensioning works, the key components of a PT system, construction sequencing, design considerations and the advantages it offers for buildings. It also explores how to identify a PT slab, the risks of drilling or cutting into one, and the precautions engineers take to maintain structural performance and safety.
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Structure Is Unstable or Ill-Conditioned: ETABS Warning Fix
The ETABS warning “structure is unstable or ill-conditioned” is a serious modelling error that should never be ignored. It indicates excessive numerical instability within the structural analysis, often caused by disconnected elements, incorrect support conditions, mechanisms, poor meshing or modelling inconsistencies. This article provides a practical step-by-step process to diagnose and resolve the problem using the Standard Solver, error logs and coordinate-based investigation, while demonstrating how minor modelling errors can significantly distort design forces and analysis results.
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Why Did the FIU Bridge Collapse
The 2018 collapse of the FIU Pedestrian Bridge was one of the most significant structural failures in recent history, resulting in multiple fatalities and prompting a major engineering investigation. This article examines the bridge’s design, construction methodology and the events leading to the collapse. Through a detailed review of the structural configuration, construction joints, post-tensioning system and load path, it explores the likely failure mechanisms at the critical node connection and the engineering lessons that can help prevent similar tragedies in the future.
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Do You Need a Pile Cap for a Single Pile
While pile caps are commonly used to transfer loads from columns into pile foundations, they are not always required for single pile foundations. This article explores the purpose of pile caps, including load transfer, tolerance management and load sharing, and explains when a single pile can safely support a column without one. Learn the detailing considerations required to accommodate construction tolerances, reinforcement placement and bearing stresses, along with the advantages and limitations of eliminating a pile cap in suitable ground conditions.
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Can Steel Beams Be Melted by Jet Fuel
Jet fuel cannot melt structural steel, but that fact alone does not explain how buildings behave during severe fires. This article examines the science behind steel strength, melting temperatures and fire performance, comparing the burn temperature of jet fuel with the thermal properties of structural steel. It explains how elevated temperatures reduce steel strength, how thermal expansion and differential heating can deform members, and why significant structural failures can occur well before steel reaches its melting point.
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What Is Hydrostatic Pressure in Basement Structures
Hydrostatic pressure is the force exerted by water at rest and is a critical consideration in the design of basement structures below the groundwater table. This article explains how hydrostatic pressure develops with depth, how it affects basement walls and slabs, and the methods engineers use to manage it. Learn the difference between drained and undrained basements, how agricultural and French drains relieve groundwater pressure, and why hydrostatic slabs and tension piles are sometimes required to resist uplift and buoyancy forces.
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All About Modulus of Subgrade Reaction
The Modulus of Subgrade Reaction is a key geotechnical parameter used to measure soil stiffness and predict how much a footing or pavement will settle under load. This article explains what the Modulus of Subgrade Reaction is, how it is expressed and converted between units, typical values for different soil types, and why it plays such an important role in foundation design. It also explores how structural engineers use soil stiffness in finite element analysis, how it influences stress distribution beneath footings, and how field plate load testing is used to determine the value on site.
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Span to Depth Ratio of Slabs and Beams
Span to depth ratios are one of the most powerful preliminary design tools used by Structural Engineers to estimate slab and beam sizes before undertaking detailed analysis. This article explains how span to depth ratios work, the importance of understanding span length, continuity and cantilever behaviour, and provides practical ratio tables for reinforced concrete, post-tensioned concrete and steel structures. Learn how these rules of thumb assist with concept design, structural planning and member sizing, while understanding why all preliminary dimensions must ultimately be verified through
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