Seismic Retrofitting of Irregular Pre-80s Low-rise Conventional RC Building Structures

Abstract

A resilience and seismic safety evaluation method of under-qualified concrete structures designed based on codes prior to the introduction of earthquake provisions is presented. A numerical method for evaluating and improving a structure’s performance and resilience through jacketing and Carbon Fiber Reinforced Polymers (CFRP) retrofitting was developed. The model analyzed the structure’s existing condition, inadequate elements were identified, and segments that required strengthening were determined. Retrofitting and external reinforcing techniques were applied, and their effectiveness evaluated. Elements identified as insufficient were subjected to a strengthening iteration process to ensure that all qualifications were fulfilled. It was proven that the numerical simulation was accurate, cost-effective and time-saving in evaluating deficient structures and the effectiveness of their strengthening methods. The numerical model and analysis in conjunction with the technology of jacketing and CFRP retrofitting provide a fast and straightforward solution for older structures in ameliorating their resilience and overall performance

Pengaruh Penambahan Tulangan Vertikal Pada Perkuatan Balok Beton Bertulang Dengan Menggunakan Metode Deep Embedment

“…Banyak metode yang sudah dilakukan untuk meningkatkan kapasitas beban struktur balok beton bertulang. Beberapa metode ini di antaranya a) metode konvensional dengan cara memperbesar dimensi balok atau menempelkan plat baja pada penampang balok (Faghihmaleki, 2021;Lie et al, 2021), dan b) metode baru dengan menggunakan material komposit fiber reinforced polymer (FRP) (Djamaluddin et al, 2015). Metode perkuatan dengan menggunakan material FRP ini dapat dilakukan dengan cara external bonded (EB) yaitu merekatkan lembaran FRP ke permukaan beton (Benzeguir Zine El et al, 2019;Chalioris et al, 2020;Jamal et al, 2016;Kar & Biswal, 2021;Oller et al, 2019;Sultan et al, 2022), dan atau near-surface mounted (NSM) yaitu memasang tulangan pada alur yang dibuat di permukaan selimut beton (Ibrahim et al, 2020;Nikoloutsopoulos et al, 2023;Panahi et al, 2021;Utomo et al, 2021;Zhang et al, 2017).…”

“…Hasil penelitian juga menunjukkan terjadi debonding dan detachment sehingga kapasitas ultimit FRP yang digunakan tidak tercapai (Bennegadi et al, 2016;Bocciarelli & Pisani, 2017;Fu et al, 2018;Ozbakkaloglu et al, 2017). Debonding dan detachment ini terjadi akibat kuat tarik beton jauh lebih kecil dari kuat tarik material perkuatannya (Hadjazi et al, 2016;Utomo et al, 2021).…”