{"id":4552,"date":"2025-01-13T12:27:56","date_gmt":"2025-01-13T08:57:56","guid":{"rendered":"https:\/\/niazit-ceiling.com\/niazit-vs-chormit\/"},"modified":"2026-02-12T12:05:48","modified_gmt":"2026-02-12T08:35:48","slug":"niazit-vs-chormit","status":"publish","type":"page","link":"https:\/\/niazit-ceiling.com\/en\/niazit-vs-chormit\/","title":{"rendered":"Niazit Vs. Chormit"},"content":{"rendered":"\t\t
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\u2728 Comprehensive Comparison of NIAZIT Joist and Chromite Joist \u2728<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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This article presents a code-oriented and engineering-based comparison<\/strong> between the NIAZIT Open Web Steel Joist (OWSJ)<\/strong> system and conventional Chromite open web joists<\/strong>, focusing on concrete web elimination, 30\u201340% reduction in concrete consumption, slab dead load adjustment for ETABS modeling, support connections, and span capacity<\/strong>, in accordance with ISIRI 12977<\/strong> and SJI 200-2015<\/strong>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\ud83d\udd39 Top Chord Performance<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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\ud83d\udd38 Chromite Joist (Open Web Steel Joist)<\/h3>

In Chromite joists, the top chord is typically made of angle sections. Since angle sections have a single-axis radius of gyration, they are highly susceptible to lateral buckling under compressive forces, particularly during concrete casting without shoring.<\/p>

Important Note:<\/strong>
According to Clause 4-4 of Iranian Standard No. 12977, joists longer than 6.5 meters must use double symmetrical angles<\/strong> for the top chord. Failure to comply with this requirement is one of the main reasons for slab collapse during concrete pouring.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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\ud83d\udd38 NIAZIT Joist (Joist Without Concrete Web)<\/h3>

In NIAZIT joists, the top chord is designed using a T-section<\/strong> from the beginning. Due to its symmetrical geometry and biaxial radius of gyration, the T-section demonstrates superior resistance to lateral buckling during construction and concrete placement.<\/p>

The top chord can be accurately designed for all loading conditions:<\/p>

  • Composite<\/p><\/li>

  • Non-composite<\/p><\/li>

  • With shoring<\/p><\/li>

  • Without shoring<\/p><\/li><\/ul>

    Non-composite condition<\/strong> refers to scenarios where the joist alone carries all dead and live loads without relying on concrete.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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    \ud83d\udd39 Web Member Performance (Structural Behavior)<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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    \ud83d\udd38 Chromite Joist<\/h3>

    The web system consists of continuous zigzag rebars acting alternately in tension and compression. Each bend in the zigzag is simultaneously subjected to tensile and compressive stresses, resulting in stress concentration and long-term deflection, especially during and after concrete casting.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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    \ud83d\udd34 compression area<\/p>

    \ud83d\udd35 tenshion area\u00a0area<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    \ud83d\udd38 NIAZIT Joist<\/h3>

    The web members are composed of separate vertical and diagonal steel elements<\/strong>, each specifically designed:<\/p>

    • Vertical members resist compression<\/p><\/li>

    • Diagonal members resist tension<\/p><\/li><\/ul>

      The absence of bends and continuity eliminates stress concentration and allows:<\/p>

      • Independent design of each member<\/p><\/li>

      • Targeted strengthening where required<\/p><\/li>

      • Improved structural efficiency<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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        \ud83d\udd34 compression area<\/p>

        \ud83d\udd35 tenshion area\u00a0area<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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        \ud83d\udd39 Web Member Design & Analysis<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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        \ud83d\udd38 Chromite Joist<\/h3>

        After concrete hardening, the zigzag rebar is designed primarily based on shear control according to Clause 2-2-2-5 of Publication No. 543, requiring at least 25% of the support reaction. Due to continuity, local strengthening is not possible without increasing the entire rebar size.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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        \ud83d\udd38 NIAZIT Joist<\/h3>

        Each web member can be analyzed and designed individually<\/strong>, allowing precise structural optimization. Local reinforcement is possible under special loading conditions without unnecessary material increase.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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        \ud83d\udd39 Concrete Web Evaluation<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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        \ud83d\udd38 Chromite Joist<\/h3>

        Concrete infill in the web often suffers from poor vibration and compaction, leading to reduced compressive strength. Under seismic excitation, cracked or poorly bonded concrete web significantly loses effectiveness, causing long-term slab deflection.<\/p>

        \ud83d\udd38 NIAZIT Joist<\/h3>

        By eliminating concrete from the web:<\/p>

        • Dead load is reduced<\/p><\/li>

        • Structural elasticity is increased<\/p><\/li>

        • Seismic performance is significantly improved<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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          \ud83d\udd39 Concrete Web in Joists (Economic Comparison)<\/h2>

          \ud83d\udd38 Chromite Joist:<\/strong> Higher Concrete Consumption \u274c
          \ud83d\udd39 NIAZIT Joist:<\/strong> 30\u201340% Less Concrete Consumption \u2705<\/p>

          Since NIAZIT joists are designed without concrete in the web<\/strong>, there is a substantial difference compared to Chromite open web joists<\/strong>, both in terms of slab dead load<\/strong> and overall construction cost<\/strong>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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          Concrete volume in Chromite open web joists<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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          minus<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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          Concrete volume in NIAZIT joists without concrete web<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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          equals<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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          Net concrete consumption difference<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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          **Sample Table: Reduction of Slab Dead Load for ETABS Modeling<\/h3>

          (Assumed Concrete Haunch Dimensions = 8 \u00d7 25 cm)**<\/p><\/td><\/tr>

          Open Web Joist Arrangement (Chromite)<\/strong><\/p><\/td>

          Joist Spacing (cm)<\/strong>\u00a0<\/p><\/td>

          		Dead Load Reduction (kg\/m\u00b2)<\/strong>\u00a0<\/td><\/tr>
          Single Joist<\/td>50<\/td>-96<\/td><\/tr>
          Double Joist<\/td>50<\/td>-192<\/td><\/tr>
          Single Joist<\/span><\/td>70<\/td>-69<\/td><\/tr>
          Double Joist<\/td>70<\/td>-138<\/td><\/tr>

          Weight Reduction Formula<\/strong><\/h3>

          Concrete Unit Weight \u00d7 (Joist Spacing \u00f7 Haunch Concrete Area)
          = Dead Load Difference per Square Meter of Slab<\/strong><\/p><\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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          Table: Reduction in Haunch Concrete Consumption Cost in NIAZIT Slab Compared to Chromite Slab<\/strong><\/h3>

          (per 1,000 m\u00b2 of Net Slab Area)\u00a0<\/p><\/td><\/tr>

          Open Web Joist Arrangement (Chromite)<\/strong><\/td>Joist Spacing (cm)<\/strong>\u00a0<\/td>Reduction in Concrete Volume in NIAZIT Slab (m\u00b3)\u00a0<\/strong><\/td><\/tr>
          Single Joist<\/td>50<\/td>40<\/td><\/tr>
          Double Joist<\/td>50<\/td>80<\/td><\/tr>
          Single Joist<\/td>70<\/td>29<\/td><\/tr>
          Double Joist<\/td>70<\/td>58<\/td><\/tr>

          Cost Difference Formula<\/strong><\/h3>Daily Concrete Unit Price \u00d7 (Joist Spacing \u00f7 Haunch Concrete Area)<\/strong>
          = Concrete Cost Difference per Square Meter of Slab<\/strong><\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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          Engineering Note (ETABS Application)<\/strong><\/h3>

          The above values represent the reduction in slab dead load<\/strong> resulting from the elimination of haunch concrete in the NIAZIT Joist System<\/strong> compared to the conventional Chromite open web joist system.
          These values may be directly applied in ETABS<\/strong> as a negative dead load adjustment (\u0394DL)<\/strong> for slab load definitions.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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          \n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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          \ud83d\udd39 Joist Connections and End Fixity at Supports<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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          \ud83d\udd38 Chromite Joist<\/h3>

          These connection details often result in limited fixity and reduced structural reliability<\/strong>, especially under construction-stage and seismic loading.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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          In steel frame structures, the first zigzag web member of a Chromite joist<\/strong> is subjected to high force demand and therefore requires significant strengthening.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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          Chromite joist connection in reinforced concrete frame structures<\/strong><\/p>

          • In unhaunched conditions<\/strong>, the connection capacity is generally insufficient<\/p><\/li>

          • Limited end fixity at supports<\/p><\/li>

          • Reduced reliability under construction and seismic loads<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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            \ud83d\udd38 NIAZIT Joist<\/h3>

            In the NIAZIT joist system<\/strong>, connections are designed as structural load-resisting details<\/strong>.<\/p>

            • Use of vertical stiffener plates<\/strong><\/p><\/li>

            • Reliable force transfer at supports<\/p><\/li>

            • Higher end fixity<\/p><\/li>

            • Improved seismic performance<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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              NIAZIT joist connection in steel frame structures (with vertical stiffener plate)<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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              NIAZIT joist connection in reinforced concrete frame structures<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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              \n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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              \ud83d\udd39 Weight, Span & Execution<\/h2>

              \ud83d\udd38 Chromite Joist<\/h3>

              For spans above 7\u20138 meters:<\/p>

              • Double joists are required<\/p><\/li>

              • Continuous stiffening plates must be used<\/p><\/li>

              • Double-angle top chords are mandatory<\/p><\/li><\/ul>

                Any deviation from these requirements voids compliance with Standard 12977.<\/p>

                \ud83d\udd38 NIAZIT Joist<\/h3>

                Designed in accordance with SJI 200-2015<\/strong>, Clause 5.5.2.1:<\/p>

                • Spans up to 18.3 meters are permitted<\/p><\/li>

                • Longer spans achievable with bolted connections<\/p><\/li>

                • No need for double joists<\/p><\/li>

                • Reinforcement applied only where structurally required<\/p><\/li><\/ul>

                  Optimized joist spacing:<\/strong><\/p>

                  • Residential spans up to 9 m \u2192 70 cm<\/p><\/li>

                  • Longer spans \u2192 50 cm<\/p><\/li><\/ul>

                    \ud83d\udd39 Final Conclusion<\/h2>

                    For short spans (\u22484 m), the weight difference between Chromite and NIAZIT joists is minimal. However, in medium and long spans, NIAZIT joists offer superior performance<\/strong> in terms of:<\/p>

                    • Weight reduction<\/p><\/li>

                    • Span capacity<\/p><\/li>

                    • Structural safety<\/p><\/li>

                    • Code-compliant design<\/p><\/li>

                    • Construction efficiency<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

                      \u2728 Comprehensive Comparison of NIAZIT Joist and Chromite Joist \u2728 This article presents a code-oriented and engineering-based comparison between the NIAZIT Open Web Steel Joist (OWSJ) [\u2026]<\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_angie_page":false,"footnotes":""},"class_list":["post-4552","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/niazit-ceiling.com\/en\/wp-json\/wp\/v2\/pages\/4552","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/niazit-ceiling.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/niazit-ceiling.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/niazit-ceiling.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/niazit-ceiling.com\/en\/wp-json\/wp\/v2\/comments?post=4552"}],"version-history":[{"count":0,"href":"https:\/\/niazit-ceiling.com\/en\/wp-json\/wp\/v2\/pages\/4552\/revisions"}],"wp:attachment":[{"href":"https:\/\/niazit-ceiling.com\/en\/wp-json\/wp\/v2\/media?parent=4552"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}