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Inggar Septhia Irawati
Departemen Teknik Sipil Dan Lingkungan Universitas Gadjah Mada, Jalan Grafika 2 Yogyakarta, Indonesia
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Environmental Science Mechanical Engineering Transportation

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Thermomechanical Analysis of Cement Hydration Effects in Multi-layered Pier Head Concrete: Finite Element Approach Mohammad Ismail Ramadan Ahmad; Inggar Septhia Irawati; Ali Awaludin; Suprapto Siswosukarto
Journal of Engineering and Technological Sciences Vol. 56 No. 5 (2024)
Publisher : Directorate for Research and Innovation, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2024.56.5.7

Abstract

Mass concrete plays a crucial role in infrastructure development, yet its complex thermo-mechanical behavior poses challenges, especially in the construction of multi-layered structures like pier heads. This study investigated the thermo-mechanical behavior of a pier head during its concreting process in three stages, including the influence of temperature differences that impact the thermomechanical balance of the concrete. By utilizing the ABAQUS software, thermo-mechanical analysis was conducted to simulate temperature fluctuations during cement hydration. The model integrates thermal analysis to simulate temperature fluctuations during cement hydration and stress distribution during construction, validated through mesh convergence studies and field data comparison. The mechanical analysis considered concrete properties, temperature variations, and construction phase. Nonlinear material behavior and contact interactions between layers were incorporated to obtain a realistic simulation. The results indicated that a multi-layer system can balance temperatures, reducing thermal stress-induced cracking risks. Furthermore, specific test points within the pier head were assessed, revealing potential internal cracks by comparing thermal stresses to the concrete’s tensile strength. This research offers insight into pier head conditions during construction, highlighting critical stress zones, crack prediction, and construction sequence efficacy.
Assessment and Strengthening of Bolted Connections in the Mandomai Bowstring Bridge Constructed with Ulin Wood Shafira Khairunnisa Subchan; Ali Awaludin; Miqdad Khosyi Akbar; Radika Gandi Tama; Angga Fajar Setiawan; Angga Trisna Yudhistira; Inggar Septhia Irawati; Andreas Triwiyono
Civil Engineering Dimension Vol. 28 No. 1 (2026): MARCH 2026
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9744/ced.28.1.101-110

Abstract

This study assessed and proposed a retrofit strategy for bolted timber connections in the Mandomai pedestrian bridge, constructed from Ulin wood (Eusideroxylon zwageri). Numerical modeling, analytical evaluation using Eurocode 5 yield equations, and experimental validation were conducted. Axial forces from a global Midas Civil model under a 1.25 kN/m² live load showed three critical connections (S11, S13, S14) with demand-capacity ratios (DCR) exceeding 1.0. A retrofit using steel side plates and ASTM A325 bolts reduced DCRs to 0.79, 1.02, and 0.70, respectively. Experimental testing of limited full-scale double-shear wood-to-wood joints demonstrated an average ultimate capacity of 191 kN, which was 57.65% higher than the theoretical prediction, indicating the conservative nature of Eurocode 5 and the contribution of mechanisms such as the rope effect and frictional interlock. The results confirmed the retrofit’s effectiveness and highlighted the need to refine design provisions for dense tropical hardwoods.
Co-Authors Ali Awaludin Ali Awaludin Ali Awaludin Ali Awaludin Ali Awaludin Andreas Triwiyono Angga Fajar Setiawan Angga Trisna Yudhistira Annisa Junaid Budi Basuki Djoko Sulistyo Galuh Bahari Ignatius Aris Hendaryanto Ilham Ayu Putri Pratiwi Miqdad Khosyi Akbar Mohammad Ismail Ramadan Ahmad Nareswari Novita Satiti Nurjanah Nurjanah Radhian Krisnaputra Radika Gandi Tama Ragil Widyorini Setiawan, Widia Shafira Khairunnisa Subchan Silvano Virgio Prasta Prasta Sugiyanto Sugiyanto Sugiyanto Sukarman Sukarman Suprapto Siswosukarto Suryo Darmo Urwatul Wusqo Urwatul Wusqo