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The Asteroid (Nicosia) — Theodoros's previous work at Dion. Toumazis & Associates

🔎 Project attribution — full disclosure
The Asteroid is not a Papagiannis Structural Engineers LLC project — TPS LLC was founded after the project completed. Theodoros Papagiannis served as Senior Structural Engineer at Dion. Toumazis & Associates during the design phase, contributing to the structural design under the firm's overall structural direction. His individual responsibilities included: review of the geotechnical report and selection of the raft-on-piles foundation strategy; analysis and design of both the piles (≈10m depth, ≈1m diameter) and the pile-supported raft under gravity, lateral, seismic, and wind loads; primary structural analysis of the superstructure using FESPA LH-Logismiki for the whole-building model with explicit SAP2000 modelling of the central core; and steel joint connection design under the relevant Eurocode provisions. The structural design underwent rigorous multi-stage independent verification — full compliance with Eurocodes EN 1990, EN 1991, EN 1992, EN 1993, EN 1994, EN 1997, and EN 1998.


We include The Asteroid here because the experience shaped how Theodoros approaches ambitious structural geometry at tower scale today — and because architects choosing a structural design partner deserve full attribution behind the practice they choose.

80m · 16 floors · 10,000 m² · Twice European Property Awards winner

Standing 80 metres above Limassol Avenue, The Asteroid answers a question Nicosia — predominantly low-rise — has rarely had to answer: how does ambitious tower geometry survive Eurocode 8 without being flattened into orthogonality? The answer lives in the raking columns on the north and south façades — inclined structural elements that produce the curved glass surfaces while routing non-vertical load paths through 16 floors and 2 basements down to a piled raft foundation. The lateral system combines the perimeter raking columns with a central RC core in a wall-dominant arrangement (Eurocode 8 §5.1.2), tuned to a behaviour factor q ≈ 2.7–3.0 — medium ductility, wall system (DCM), with the geometric k_w factor applied. Concrete classes C30/37 and C35/40 throughout; structural steel at the north veranda, east lobby, and roof canopy designed to Eurocode 3, with composite steel-concrete detailing per Eurocode 4. The building has been twice recognised by the European Property Awards.

The Asteroid tower at dusk, Nicosia — illuminated glass facade and cantilevered roof canopy on a reinforced concrete and structural steel frame
The Asteroid office tower, Nicosia — 80m, 16-storey high-rise with raking columns and curved glass facade in daylight

Structural Design Partner for Cyprus Architects

Eurocode-compliant structural engineering for architects working at the edges of what reinforced concrete and steel can do.

Cantilevers, curved façades, long spans, transfer structures, exposed concrete in fin walls (τοιχώματα ανάρτησης) — the moment a building's geometry stops being orthogonal, the structural conversation changes. Papagiannis Structural Engineers LLC is led by Theodoros Papagiannis, ETEK-registered engineer with 15+ years in practice and former Senior Structural Engineer on The Asteroid at Dion. Toumazis & Associates. We work with architects across Cyprus on residential, mixed-use, and commercial projects where the structural answer needs to support the architectural intent — not negotiate it down.

Related Engineering Services

Complement your steel structure project with our additional structural engineering services in Nicosia, Limassol, Larnaca, Paphos, ParalimniFamagusta and in general throughout Cyprus!

The 7-step methodology

  • Geotechnical liaison — Soil assessment, foundation strategy. Initial review in-house; specialist geotechnical investigation coordinated externally when required.

  • Material selection — in consultation with the architect — RC, structural steel, hybrid systems. Architectural vision drives the choice; we provide the technical implications and recommendations.

  • Preliminary structural design — Column grid, transfer structures, cantilever schemes, lateral system. Initial sizing presented as alternatives that support the architectural concept.

  • Full Eurocode-compliant structural analysis — Detailed analysis per EN 1990–1998, with particular care to Eurocode 8 for Cyprus seismic design. Conducted after preliminary design is approved by the architect.

  • Construction drawings + (optional) 3D BIM — Complete 2D construction drawings produced in-house. 3D BIM coordination via trusted external specialist when required, separately and transparently quoted.

  • Permit documentation — All structural deliverables prepared to Cyprus regulatory requirements, coordinated with the architect's submission package.

  • Site supervision and reports to the architect — Structural supervision throughout construction. Every site visit documented in a report shared with the architect, preserving architectural intent during execution.

A collaborative stance, not a service-provision

Architecture and structural engineering succeed when the two disciplines stay in conversation from concept to delivery. The conventional model — architect designs, engineer reacts — produces compromised geometry, late-stage value engineering arguments, and buildings where the structural cost was paid in architectural ambition. We work differently.

From the first design conversation, we work alongside the architect to find the structural strategy that supports the design rather than fighting it. Column placement, lateral resistance system choice, foundation strategy, material selection — these decisions are made in consultation with the architect, not imposed afterward. When a structural choice will materially change the architectural intent, we say so early — with alternatives and trade-offs on the table — and let the architect choose.

The analytical depth your design deserves

We operate a deeper, fully-licensed analytical environment because the geometry our clients design demands it — and because Eurocode 8 in a moderate-seismicity country leaves little room for shallow technical work. Reinforced concrete, structural steel, timber, hybrid systems, RC assessment and retrofit, finite-element joint design — each handled with the right tool, fully licensed, no shortcuts.

The technical stack

FespaC — Reinforced concrete analysis and design from LH Λογισμική. Linear and surface elements of any cross-section geometry, integrated 2D and 3D modelling, Eurocode 2 and Eurocode 8 compliant detailing.

FespaM — Steel and composite structural analysis. Full Eurocode 3 ultimate and serviceability limit state checks, with integrated Eurocode 8 seismic analysis for multi-storey buildings.

FespaC & Ξύλινα — Timber structural design to EN 1995-1-1. Roof systems, mezzanines and isolated timber members integrated with reinforced concrete and foundations in a single 3D model.

FespaR — Reinforced concrete assessment and retrofit per Eurocode 8 Part 3 (EN 1998-3) and ΚΑΝ.ΕΠΕ. Both inelastic Pushover and elastic time-history analysis, returning the seismic performance factor that quantifies what an existing structure can withstand.

IDEA StatiCa — Component-based finite element method for steel joints and connections, beyond ETEK minimum. Used on every project where steel joints are architecturally exposed or carry meaningful demand.

In-house Excel + Python tools — Custom analysis and detailing tools built by Theodoros over 15+ years, covering problems off-the-shelf packages don't address well. Refined project by project, kept in-house.

Projects that earn their geometry

Each project below presented a specific structural challenge driven by the architectural intent. The technical solutions belong to the projects — not to a template. Cantilevers, curved façades, transfer structures, ambitious lateral systems, demanding soil conditions, mixed RC + steel coordination — the page below shows how the structural answer fits the architectural ambition rather than reducing it.

Robotower (Limassol) — design completed

6 storeys · 8,500 m² · RC basement + steel superstructure · clear spans >10.5m

A commercial office tower in Limassol where the brief refused intermediate columns on the office floors. Clear spans exceeding 10.5m on every level, glass façade on the most exposed elevations, and a programme that places the RC basement two levels below grade. The structural strategy is hybrid by necessity: an RC basement resolving earth pressures, parking geometry, and the transition into the superstructure; a steel superstructure buying the spans without paying for them in beam depth; and a joint regime designed with FEM analysis (IDEA StatiCa) where the connections carry meaningful demand. The architectural intent — column-free office floorplates wrapped in glass — drove every structural decision, not the other way around. Structural design completed; drawings submitted for quantity surveying.

Robotower office building in Limassol — glass-clad steel superstructure with vertical timber-fin screen and rooftop signage

Floating Cantilever Villa (Nicosia) under construction

Two-storey RC residence · half of the first floor projects beyond the ground floor footprint

The architect designed a "floating" first floor — a mass that reads, from the street, as if it is held in air. Nearly half of the upper floor projects past the ground floor footprint without visible intermediate columns or bracing breaking the illusion. The structural answer combines a tuned reinforced concrete cantilever system with transfer elements concealed within the floor diaphragm: load paths routed through the ground-floor structure and grounded silently, leaving the geometry to do the talking. An external swimming pool integrates directly into the cantilever system's load envelope. Currently under construction.

Floating Cantilever Villa in Nicosia — two-storey RC residence with a column-free first floor cantilevering beyond the ground floor

Curved Cantilever House (Athienou, Larnaca)

Single storey RC · 180 m² covered + 50 m² verandas · split-level foundation · deep beam cantilever roof

A single-storey reinforced concrete house in Athienou. The architect set two intersecting structural problems: a curved cantilever roof slab projecting over the verandas without supporting columns, and a site with enough fall to make a single floor level wasteful. We answered with a split-level foundation system that follows the natural grade, and a deep-beam solution running concealed within the roof slab that delivers the curved cantilever without visible structural support at the perimeter. The result: the roof reads as continuous geometry, not as a slab held up by columns.

Curved Cantilever House in Athienou, Larnaca — single-storey RC house with curved cantilever roof and circular oculus

220 m² RC · curved geometry · cantilever overhangs · 150 m from the Mediterranean coastline

A luxury seafront villa 150 metres from the Mediterranean. Two structural problems arrived together: curved geometry across the principal façades and extensive cantilever overhangs that the architect wanted column-free over the open-plan spaces beneath. The solution combined a cantilever beam system sized to the architectural overhangs with marine-zone reinforcement detailing — increased cover, corrosion-resistant detailing, attention to construction-joint exposure — appropriate to salt-air exposure over a sixty-year design life. The geometry was preserved; the durability question was answered separately.

Curved Cantilever House in Athienou, Larnaca — single-storey RC house with curved cantilever roof and circular oculus

Cantilever Villa (Makedonitissa, Nicosia)

Luxury RC villa · 3.5m cantilevered slab on fin walls · open-plan principal level

A 3.5-metre cantilever slab supported on fin walls, with the principal living level kept free of intermediate columns. The fin-wall strategy was the architect's: structure becomes an architectural element rather than an apology hidden behind cladding. Our job was to make the fin walls work as both vertical structure and as cantilever supports — sized for the 3.5m projection plus dynamic load combinations, detailed for the joint condition where the cantilever slab meets the fin wall, and reinforced to keep the architectural slimness intact at every section.

Cantilever Villa in Makedonitissa, Nicosia — luxury RC residence with a 3.5-metre cantilevered slab on exposed fin walls

Piled Foundation Villa (Pareklishia, Limassol)

4 levels · 700 m² · raft foundation on piles · montmorillonite clay substrate

When the design is unconstrained but the ground fights back, the structural answer lives below grade. A luxury 4-level villa in Pareklishia: ~700 m² across semi-basement, ground floor, first floor and second floor, sitting on montmorillonite clay — an expansive soil that contracts seasonally as moisture cycles, threatening differential and horizontal movement of any conventional foundation. The solution: a raft foundation underpinned by piles that bypass the expansive layer and bear on stable substrate beneath, stitching the building to ground that doesn't move. The superstructure above stays architecturally free; the geotechnical problem was contained where it belonged — at the foundation.

Piled Foundation Villa in Pareklishia, Limassol — four-level 700 m² RC residence on a pile-supported raft over expansive clay

Frequently Asked Questions

  • No. We are structural engineers, and that is deliberate. Architectural design belongs to the architect — we do not compete for it, and we do not offer it. Our role is to make the architectural intent structurally real: analysis, design, detailing, construction drawings, permit documentation and site supervision. Architects work with us precisely because we are not a rival practice; the design stays theirs from concept to completion.

  • The earliest practical point is at concept stage, before the geometric language of the building is locked. The structural questions that materially affect architectural geometry — column placement, transfer structures, foundation strategy, lateral system selection — are most cheaply resolved when the design is still flexible. We're happy to participate in design conversations before any formal engagement, with no obligation, when an architect is exploring whether a particular geometric ambition is achievable.

  • NO. We deliver complete 2D construction drawings in-house as standard. For projects requiring 3D BIM representation of the bearing structure — for architect coordination, clash detection, or developer BIM workflows — we coordinate with a trusted external BIM specialist whom we've worked with before. The BIM work is disclosed and separately quoted at the outset. You don't manage two consultants; we manage the specialist relationship and present you a single deliverable.

  • We coordinate the structural deliverables with the architect's permit submission package. The structural study required for building permit issuance, all supporting calculations, and any specific authority requirements are prepared on the architect's timeline, not ours. Where regulatory clarifications are needed from the Town Planning Department (Τμήμα Πολεοδομίας) or other authorities, we engage directly when authorised, or provide the architect with the supporting documents and our recommended positions.

  • Yes. Eurocode 8 seismic design is core to every project we undertake — Cyprus's seismic zone classification makes it non-negotiable, and the analytical depth scales with building type, from single-storey houses to multi-storey RC apartments, mixed-use blocks, and tower-scale structures. For apartment buildings exceeding three storeys, we conduct comprehensive capacity checks at beam-column joints to ensure ductile behaviour during seismic events. For irregular geometry, cantilever-heavy designs, or transfer structures, we model the building's seismic response with attention to torsional effects and accidental eccentricity. High-rise is not theoretical for us: Theodoros Papagiannis contributed to the structural design of The Asteroid — 80 metres, 16 floors — during his time at Dion. Toumazis & Associates, on a wall-dominant lateral system tuned to q ≈ 2.7–3.0 medium ductility. That experience informs how we approach lateral resistance on every project today.

  • Three answers, in order of how often they matter. First, analytical depth: our fully-licensed stack — FespaC, FespaM, FespaC & Ξύλινα, FespaR, IDEA StatiCa, plus custom Excel and Python tools built in-house — goes beyond ETEK minimum requirements. For ambitious geometry this matters; for a standard two-storey house, less so. Second, partnership posture: we treat the architect's design intent as the brief, and we say so early — with alternatives and trade-offs on the table — when a structural choice would materially change it. Third, honest disclosure: what's in-house, what's outsourced, what's standard, and what's an additional line item — all on the table from the first conversation.

  • Our head office is in Nicosia (Strovolos), but we serve clients across Cyprus — Nicosia, Limassol, Larnaca, Paphos, Paralimni, Famagusta — and have completed projects in Greece. Site supervision in distant locations is coordinated case-by-case; design and analysis work happens regardless of project location.

Let's discuss your next project

If you're working on a design with structural complexity — cantilever ambition, long spans, curved geometry, challenging site conditions, hybrid materials, or anything else where the conventional structural answer doesn't quite fit — we'd be glad to talk before any formal engagement.

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