{"id":21566,"date":"2026-03-12T15:10:16","date_gmt":"2026-03-12T12:10:16","guid":{"rendered":"https:\/\/bimsolutions.ge\/eng\/?p=21566"},"modified":"2026-03-12T15:10:52","modified_gmt":"2026-03-12T12:10:52","slug":"solving-complex-concrete-and-steel-joints-in-a-croatian-sports-hall","status":"publish","type":"post","link":"https:\/\/bimsolutions.ge\/eng\/blog\/solving-complex-concrete-and-steel-joints-in-a-croatian-sports-hall\/","title":{"rendered":"Solving complex concrete and steel joints in a Croatian sports hall"},"content":{"rendered":"
A new public sports hall in Velika Ludina, Croatia, a monolithic reinforced concrete frame married with a large-span steel truss roof, required both scale and sophistication. The design team at Reverto Projekt d.o.o. delivered the detailed structural calculations for this hybrid construction, relying on IDEA StatiCa\u2019s precision to resolve the demanding interface between concrete and steel. With extensive use of BIM tools and Eurocode standards, this project showcases how advanced connection design software accelerated delivery while ensuring structural integrity.<\/div>\n
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Global\u00a03D\u00a0model\u00a0of\u00a0the\u00a0structure<\/span>G<\/span>l<\/span>o<\/span>b<\/span>a<\/span>l<\/span>3<\/span>D<\/span>m<\/span>o<\/span>d<\/span>e<\/span>l<\/span>o<\/span>f<\/span>t<\/span>h<\/span>e<\/span>s<\/span>t<\/span>r<\/span>u<\/span>c<\/span>t<\/span>u<\/span>r<\/span>e<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/em><\/strong><\/p>\n

About the Project<\/h2>\n

The project involved the structural design of a new sports hall with a dual-material frame: reinforced concrete for vertical and interfloor components, and steel for the roof structure. The building spans a total footprint of 61.49 by 37.38 meters, with the central hall defined by a 36.48-meter-wide truss-supported steel roof. The roof itself combines a single-pitched and double-pitched layout, while the reinforced concrete component includes gallery slabs, stairwell corridors, and inclined spectator stand platforms. The structural design was entrusted to Reverto Projekt, led by Robert Tudor and supported by Antonija Ron\u010devi\u0107, with Alen Leljak serving as head designer.<\/p>\n

Engineering Challenges<\/h2>\n

The primary challenge was the interaction between the reinforced concrete and steel structural systems. The steel roof trusses were fixed to reinforced concrete columns and gable beams to create a monolithic diaphragm action. These connections not only had to transfer high moment and shear forces but also contribute to the global horizontal stability of the hall through the realization of a rigid roof disk.<\/p>\n

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Steel-to-concrete\u00a0structural\u00a0detail<\/span>S<\/span>t<\/span>e<\/span>e<\/span>l<\/span>–<\/span>t<\/span>o<\/span>–<\/span>c<\/span>o<\/span>n<\/span>c<\/span>r<\/span>e<\/span>t<\/span>e<\/span>s<\/span>t<\/span>r<\/span>u<\/span>c<\/span>t<\/span>u<\/span>r<\/span>a<\/span>l<\/span>d<\/span>e<\/span>t<\/span>a<\/span>i<\/span>l<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/em><\/strong><\/p>\n

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By modeling the most complex joints with precision, we could ensure safety and code compliance without conservative overdesign. – Robert Tudor, mag.ing.aedif.Structural Engineer \u2013 Reverto projekt d.o.o.<\/strong><\/div>\n<\/div>\n<\/div>\n

This necessitated joint detailing capable of withstanding a range of loads: self-weight, permanent equipment, service use, snow, wind, temperature effects, and seismic activity. The analysis needed to account not just for stress and strain but also for the rotational stiffness of joints. Inadequate stiffness could compromise the integrity of the global model, leading to significant performance risks.<\/p>\n

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\"inline<\/picture><\/a>Stiffness\u00a0diagram\u00a0My-\u03d5y<\/span>S<\/span>t<\/span>i<\/span>f<\/span>f<\/span>n<\/span>e<\/span>s<\/span>s<\/span>d<\/span>i<\/span>a<\/span>g<\/span>r<\/span>a<\/span>m<\/span>M<\/span>y<\/span>–<\/span>\u03d5<\/span>y<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/em><\/strong><\/div>\n

Further complexity was introduced by the layout geometry \u2014 with the first roof grid featuring a single pitch at 9\u00b0 and the remaining spans shaped as double-pitched roofs at 6\u00b0. These variations in slope altered load paths and affected how forces were introduced into joints. Additionally, interfloor concrete slabs, including the stepped and inclined spectator seating, added asymmetry to the vertical loading pattern, increasing the importance of accurate modeling and analysis.<\/p>\n

Solutions and Results<\/h3>\n

To manage this complexity, the engineering team turned to a highly integrated workflow centered on IDEA StatiCa\u2019s\u00a0Connection application. Connection models were developed and verified in IDEA StatiCa, with data imported directly from\u00a0SCIA Engineer\u2019s\u00a0global analysis. This seamless integration eliminated redundant modeling and helped streamline the design cycle.<\/p>\n

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3D\u00a0model\u00a0of\u00a0the\u00a0structure\u00a0in\u00a0SCIA\u00a0Engineer<\/span>3<\/span>D<\/span>m<\/span>o<\/span>d<\/span>e<\/span>l<\/span>o<\/span>f<\/span>t<\/span>h<\/span>e<\/span>s<\/span>t<\/span>r<\/span>u<\/span>c<\/span>t<\/span>u<\/span>r<\/span>e<\/span>i<\/span>n<\/span>S<\/span>C<\/span>I<\/span>A<\/span>E<\/span>n<\/span>g<\/span>i<\/span>n<\/span>e<\/span>e<\/span>r<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/em><\/strong><\/p>\n

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IDEA StatiCa saved us hours, what would have taken days to calculate manually became a streamlined part of our workflow. – Robert Tudor, mag.ing.aedif.<\/strong>Structural Engineer \u2013 Reverto projekt d.o.o.<\/strong><\/div>\n<\/div>\n<\/div>\n

Allplan was used to develop reinforced concrete detailing and formwork plans, while\u00a0Tekla Structures\u00a0supported workshop documentation. The Tekla\u2013IDEA StatiCa plugin allowed detailed verification of connection designs directly from the 3D model, ensuring accuracy and reducing rework. Specific connections, including anchoring the roof truss to concrete gables, joining secondary roof beams, and detailing truss diagonals, were modeled and optimized within IDEA StatiCa, benefiting from its clear visualization and compliance checks.<\/p>\n

\"inline<\/picture><\/a>Anchoring\u00a0of\u00a0the\u00a0roof\u00a0truss\u00a0structure\u00a0to\u00a0the\u00a0gable\u00a0RC\u00a0frames<\/span>A<\/span>n<\/span>c<\/span>h<\/span>o<\/span>r<\/span>i<\/span>n<\/span>g<\/span>o<\/span>f<\/span>t<\/span>h<\/span>e<\/span>r<\/span>o<\/span>o<\/span>f<\/span>t<\/span>r<\/span>u<\/span>s<\/span>s<\/span>s<\/span>t<\/span>r<\/span>u<\/span>c<\/span>t<\/span>u<\/span>r<\/span>e<\/span>t<\/span>o<\/span>t<\/span>h<\/span>e<\/span>g<\/span>a<\/span>b<\/span>l<\/span>e<\/span>R<\/span>C<\/span>f<\/span>r<\/span>a<\/span>m<\/span>e<\/span>s<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/em><\/strong><\/div>\n
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Integrating IDEA StatiCa with SCIA and Tekla made our BIM process genuinely efficient, a great step forward for our team. – Robert Tudor, mag.ing.aedif.<\/strong>Structural Engineer \u2013 Reverto projekt d.o.o.<\/strong><\/div>\n<\/div>\n<\/div>\n

Stiffness analyses, visualized through moment-rotation (My-\u03d5y) diagrams, confirmed joint rigidity and structural performance. Multiple connection types, including anchoring of roof trusses to gable RC frames, secondary steel-to-RC beam fixings, diagonal truss connections, and base joint assemblies, were calculated with full Eurocode compliance.<\/p>\n

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We appreciated how easy it was to test alternatives quickly. That freedom allowed us to optimize the final design without compromising schedule or budget. – Robert Tudor, mag.ing.aedif.Structural Engineer \u2013 Reverto projekt d.o.o.<\/strong><\/div>\n<\/div>\n
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