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      <doi>10.14455/ISEC.2026.13(2).STR-11</doi>
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        <article-title>DESIGN OF A 75 M CONCRETE-TIED ARCH BRIDGE:  SHAPING THE FUTURE OF RURAL CONNECTIVITY</article-title>
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      <author>MALEHA ALAM DEYA, MOHAMMAD ALI and TAPAS CHOWDHURY</author>
      <aff>Design Unit, Local Government Engineering Dept, Dhaka, Bangladesh<br /></aff>
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      <title>ABSTRACT</title>
      <p>The Local Government Engineering Department (LGED) of Bangladesh plays a vital role in developing rural transportation networks connecting remote communities to growth centers.  Bridges in the 25–50 m span range are predominantly designed as prestressed concrete girder bridges, which require large girder depths, raising deck levels and necessitating long approach viaducts.  In rural areas with adjacent houses and infrastructure, this results in higher construction costs, increased land requirements, and reduced community accessibility.  To overcome these challenges, this study presents the design of a 75 m reinforced concrete tied arch bridge, the first of its kind under LGED, intended for rural roads with constrained and complex approach conditions.  The bridge features slender reinforced concrete arch ribs, designed as compression members under combined axial load and biaxial flexure, supporting a deck system with cross beams and diaphragms that minimizes structural depth while maintaining strength and stiffness.  Tie-beam members, connecting the arch ribs, contain eight concentric longitudinal tendons, providing efficient axial restraint and limiting horizontal thrust at the supports.  Finite element modeling and design were performed using Midas Civil, following the AASHTO LRFD 2017 Bridge Design Specifications.  The design utilizes locally available materials and applies conventional formwork and construction techniques suitable for field implementation.  The design serves as a reference model for LGED for medium-span concrete bridges, facilitating lower deck elevation, improved integration with existing approach roads, and ensuring material economy and geometric efficiency.</p>
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        <italic>Keywords: </italic>Finite element analysis, Slender compression member, Concentric longitudinal tendons, AASHTO LRFD.</p>
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      <hpdf>STR-11</hpdf>
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