Numerical assessment of RC T-beams strengthened in the negative moment region with UHPC overlays
Yanuar Haryanto,Hsuan-Teh Hu,Fu-Pei Hsiao,Laurencius Nugroho,Ming-Hang Wu,Pu-Wen Weng,Chia-Chen Lin
Abstract
This study was originally presented at the 18th World Conference on Earthquake Engineering (WCEE2024). Observations from recent earthquakes indicate that modern reinforced concrete (RC) buildings located in near-fault regions have experienced substantial damage, partly attributable to design standards that were primarily developed based on far-fault ground motion characteristics. Consequently, enhancing the seismic resilience of such structures against near-fault ground motions has become an urgent engineering priority. Ultra-high performance concrete (UHPC), recognized for its superior mechanical properties, offers a promising solution for strengthening existing RC structures. This study investigates the structural performance of RC T-beams strengthened in the negative moment region using UHPC overlays. A three-dimensional finite element (FE) model was developed in ABAQUS to simulate the nonlinear behavior of concrete and steel reinforcement, incorporating 13 mm and 16 mm steel rebars. The numerical model was validated against six full-scale experimental tests, demonstrating high accuracy in predicting load capacity, displacement response, and failure modes. An analytical approach was also proposed to estimate the flexural capacity of the strengthened beams. Furthermore, a comprehensive parametric study was conducted to evaluate the effects of both near-fault and far-fault ground motions on structural response. The results show that UHPC strengthening enhances load-carrying capacity under near-fault excitation by up to 115%, accompanied by a significant reduction in tensile damage in the flange region, while also providing notable capacity improvements under far-fault conditions. The findings confirm the effectiveness of the proposed FE framework and highlight the potential of UHPC overlays in improving the seismic resilience of RC T-beams, particularly in near-fault regions.
Key Words
finite element analysis; near fault ground motion; strengthening; T-beam; ultra-high performance concrete
Address
Yanuar Haryanto — 1) Department of Civil Engineering, Faculty of Engineering, Jenderal Soedirman University, Jln. Mayjen. Sungkono KM 5, Blater, Purbalingga 53372, Indonesia, 2) National Center for Research on Earthquake Engineering, No. 200 Sec. 3, Xinhai Road, Taipei 10668, Taiwan, 3) Department of Civil Engineering, College of Engineering, National Cheng Kung University, No. 1 University Road, Tainan 701, Taiwan
Hsuan-Teh Hu, Laurencius Nugroho, Ming-Hang Wu — Department of Civil Engineering, College of Engineering, National Cheng Kung University, No. 1 University Road, Tainan 701, Taiwan
Fu-Pei Hsiao, Pu-Wen Weng, Chia-Chen Lin — National Center for Research on Earthquake Engineering, No. 200 Sec. 3, Xinhai Road, Taipei 10668, Taiwan
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