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Abstract

In this paper, we evaluated the effect of viscoplastic dampers on the response of steel frames under blast loading. We used SAP2000 software and link elements to investigate the responses of nine-story steel frames with and without dampers. The proposed viscoplastic damper is a new type of viscous damper. The application of this damper is based on the availability of its constituent materials. The damper acts as a viscoelastic damper at low levels of vibration, but it acts as a combination of viscoelastic operator and metal-yielding device at extreme levels of vibration. With respect to the height of the structure, the need for the correct distribution is underlined, which is addressed by developing a non-uniform loading at the height of the structure. We used A.T.-Blast software program to measure the required parameters to calculate the pressure coming from the blast. The comparison of the simulation results with and without dampers demonstrated about 33% reduction in responses with respect to the top floor displacements and about 59% reduction in modeling the nine-story steel frame with brass and bending moments at column bases, which represents the optimal operation of viscoplastic damper in steel frame under blast loading. It is demonstrated that using viscoplastic damper with brace improves the blast resistance of structures.

Bahasa Abstract

Penggunaan Peredam Viskoplastis untuk Meningkatkan Ketahanan Rangka Baja pada Pembebanan Letupan. Di dalam naskah ini, kami mengevaluasi pengaruh peredam viskoplastis (plastik kental) terhadap respons rangka baja pada pembebanan letupan. Kami menggunakan perangkat lunak SAP2000 dan elemen-elemen penghubung untuk menyelidiki respons-respons dari rangka baja sembilan lantai dengan dan tanpa peredam. Peredam viskoplastis yang diusulkan merupakan suatu tipe peredam kental baru. Penggunaan peredam ini berdasarkan pada ketersediaan bahan-bahan konstituennya. Peredam bekerja sebagai suatu peredam viskoelastis pada level-level vibrasi rendah, tetapi peredam ini bekerja sebagai suatu kombinasi dari operator viskoelastis dan peranti penghasil logam pada level-level vibrasi yang ekstrim. Sehubungan dengan ketinggian struktur, ditekankan pada kebutuhan akan pendistribusian yang benar, yang ditangani dengan mengembangkan suatu pembebanan yang tidak merata pada ketinggian struktur. Kami menggunakan program perangkat lunak A.T.-Blast untuk mengukur parameter-parameter yang diperlukan untuk menghitung tekanan yang dapat dari letupan. Pembandingan hasil-hasil simulasi dengan dan tanpa peredam menunjukkan sekitar 33% penurunan respons sehubungan dengan perpindahan lantai atas dan sekitar 59% penurunan dalam pemodelan rangka baja sembilan lantai dengan kuningan dan momen pembengkokkan pada alas kolom, yang mewakili pengoperasian optimal peredam viskoplastis pada rangka baja pada pembebanan letup. Di sini ditunjukkan bahwa dengan menggunakan peredam viskoplastis dengan penguat meningkatkan ketahanan letupan struktur.

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