Judul: STRENGTH EVALUATION OF  HIGH-RISE BUILDING STRUCTURE BASED ON EARTHQUAKE ACCELERATION SPECTRUM RESPONSE SNI 03-1726-2019, Structure evaluation of building based on the earthquake response acceleration spectrum of the SNI 03-1726-2019
Abstrak: Indonesia merupakan negara yang rawan terhadap bencana gempa bumi. Pemerintah Indonesia dalam mewujudkan usaha mitigasi gempa bumi, telah menetapkan syarat-syarat perencanaan dan penentuan pengaruh gempa rencana di dalam SNI 1726-2019 dengan peta bahaya gempa Indonesia yang telah sesuai acuan internasional yaitu American Society of Civil Engineering (ASCE) 7-16 sebagai revisi ASCE 7-10 pada SNI 1726-2012. Evaluasi struktur bangunan terhadap penerapan SNI 1726-2019 dapat di analisa dengan pemodelan struktur bangunan yang dilakukan dengan metode konvensional. Identifikasi pembaruan didalam SNI gempa dan mengaplikasikannya kedalam pemodelan struktur bangunan high-rise building, dapat membuktikan keamanan eksisting bangunan dari pengaruh gempa bumi. Perubahan SNI 1726-2012 menjadi SNI 1726-2019 terdapat banyak penyesuaian dan peningkatan parameter analisa gempa. Berdasarkan hasil penelitian pada lokasi studi mengalami peningkatan parameter percepatan gempa yang dimaksud, seperti nilai Ss yang meningkat sebesar 7,32%; nilai S1 sebesar 5,88%; nilai Fa menurun sebesar 2,75%; nilai Fv sebesar 7,25%; nilai SMS sebesar 4,57%; nilai SM1 sebesar 12,93%; nilai SDS sebesar 4,58%; nilai SD1 sebesar 13,03% dan nilai FPGA sebesar 1,75%. Identifikasi kedua SNI gempa menunjukkan adanya perbedaan dan peningkatan pada kombinasi pembebanan, desain respon spektrum gempa, analisa ragam dan penskalaan gaya. Peningkatan yang terjadi pada struktur bangunan high-rise building, dinyatakan aman dan memenuhi persyaratan saat diterapkan dalam analisa struktur bangunan berdasarkan SNI 1726-2019. Hal ini menyatakan bahwa tidak perlu adanya retrofitting (peningkatan atau perbaikan) pada obyek penelitian., Indonesia is a country that is prone to earthquakes. The Indonesian government in realizing earthquake mitigation efforts, has determined the requirements for planning and determining the impact of the earthquake plan in SNI 1726-2019 with an Indonesian earthquake hazard map that has been in accordance with international references, namely the American Society of Civil Engineering (ASCE) 7-16 as a revision. ASCE 7-10 on SNI 1726-2012. Evaluation of building structures against the application of SNI 1726-2019 can be analized by modelling building structures using conventional methods. Identification of updates in the SNI for earthquakes and applying them to the modelling of high-rise buildings can prove the safety of existing buildings from the effects of earthquakes. Changes from SNI 1726-2012 to SNI 1726-2019 there are many adjustments and improvements to earthquake analysis parameters. Based on the results of research at the study site, the earthquake acceleration parameter has increased, such as the Ss value which increased by 7,32%; S1 score of 5,88%; the Fa value of -2,75%; Fv value of 7,25%; SMS value is 4,57%; SM1 value is 12,93%; SDS value of 4,58%; SD1 value is 13,03% and FPGA value is 1,75%. The identification of the two SNI earthquakes shows that there are differences and improvements in the combination of loading, earthquake response spectrum design, analysis of variance and force scaling. Improvements that occur in high-rise building structures are declared safe and meet the requirements when applied in the analysis of building structures based on SNI 1726-2019. This shows that there is no retrofitting (improvement or restoration) of the research subject.
Keyword: gempa bumi, high-rise building, struktur bangunan, pembaruan SNI, earthquake, high-rise building, building structure, SNI update

Judul: Analisis Kekuatan Struktur Pada Bangunan 8 Lantai Berdasarkan Respon Spektrum SNI 03-1726-2019 Menggunakan SAP2000
Abstrak: Suatu struktur bangunan gedung atas beberapa elemen penyusun strukturnya. Indonesia merupakan daerah rawan gempa karena dilalui oleh jalur pertemuan 3 lempeng tektonik. Upaya mitigasi kegagalan struktur di Indonesia akibat gempa sangat perlu dilakukan untuk mengetahui kondisi kinerja struktur bangunan tersebut. Tujuan penelitian ini adalah untuk melakukan pemodelan menggunakan software SAP2000 serta menganalisis kekuatan struktur pada bangunan 8 lantai terhadap gempa. Penelitian dilakukan dengan menggunakan tiga skenario dengan metode respon spektrum. Penyesuaian as built drawing perlu dilakukan karena terdapat perbedaan antara gambar rencana dengan kondisi existing. Pada hasil identifikasi kegagalan struktur Gedung X terdapat kegagalan pada saat beban gempa diinputkan. Terdapat 2 frames yang mengalami overstress pada skenario tiga. Berdasarkan hasil analisis simpangan antar lantai dan efek P-Δ, Gedung X dinilai aman karena nilai yang didapat tidak melebihi simpangan izin. Rekomendasi struktur berupa penambahan dimensi kolom menjadi 500 mm × 500 mm, serta pembesaran diameter tulangan menjadi 32 mm., A building structure consists of several structural elements. Indonesia is an earthquake-prone area because it is traversed by the meeting point of 3 tectonic plates. Mitigation of structural failures in Indonesia due to earthquakes really needs to be done to determine the performance conditions of these building structures. The purpose of this research is to perform modeling using SAP2000 software and to analyze the structural strength of an 8-storey building against earthquakes. The research was conducted using three scenarios with the response spectrum method. Adjustments to the as built drawings need to be made because there are differences between the plans and the existing conditions. In the identification results of the failure of the X Building structure there is a failure when the earthquake load is input. There are 2 frames that experience overstress in scenario three. Based on the analysis of the deviation between floors and the P-Δ effect, Building X is considered safe because the value obtained does not exceed the permit deviation. Structural recommendations include adding column dimensions to 500 mm × 500 mm, and increasing the reinforcement diameter to 32 mm.
Keyword: Gempa, Respon spektrum, SAP2000, Struktur

Judul: Model Input-output dalam Masalah Network Flow
Abstrak: Production process is a process, which is done by industry, to transform input into output. According to the type of output and its activity, industry can be classified into various sectors, which are connected to each other. Therefore, a model to analyze the connection among sections is needed. The model is known as input-output model (IO model). IO model presents an IO table, which shows informations about the transaction between goods and services in each economic sector. Furthermore, the IO model also shows that the amount of all input is the same as the amount of all output. In this paper, the transaction of each economic sector in IO table is analyzed using network flow theory. The formulated network flow problem implies that each sector represents partly as a producer and also as a consumer. This paper also solves a minimum cost circulation problem.
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