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: Performance Evaluation of Multi-Storey Building Structures using Pushover Analysis with Spectrum Capacity Method and Displacement Coefficient
Abstrak: Frekuensi kejadian gempa bumi yang tinggi di Indonesia mendorong kebutuhan untuk merencanakan bangunan sesuai dengan standar tahan gempa. Oleh karena itu, penelitian ini bertujuan untuk mengevaluasi kinerja struktur bangunan bertingkat dan menentukan tingkat kinerjanya. Metode yang digunakan dalam penelitian ini adalah analisis pushover. Struktur bangunan dimodelkan menggunakan perangkat lunak ETABS, dengan pembebanan yang sesuai dengan standar SNI 1726:2019, 1727:2020, dan PPPURG 1987. Hasil analisis menunjukkan bahwa struktur gedung dapat dikatakan stabil dalam pengecekan pengaruh P-Delta, namun belum memenuhi batas izin simpangan inelastik. Titik kinerja berdasarkan FEMA 440 didapatkan nilai sebesar 303,618 mm untuk arah X dan 285,934 mm untuk arah Y. Sedangkan berdasarkan FEMA 356 target perpindahan didapatkan nilai sebesar 313,997 mm untuk arah X dan 295,493 mm untuk arah Y. Rasio daktalitas arah X sebesar 1,446 dan untuk arah Y sebesar 1,42. Selain itu, didapatkan nilai redaman efektif sebesar 5,88% untuk arah X dan 5,81% untuk arah Y., The high frequency of earthquake events in Indonesia drives the need to plan buildings according to earthquake-resistant standards. Therefore, this study aims to evaluate the performance of multi-storey building structures and determine their performance level. The method used in this research is pushover analysis. The building structure was modeled using an ETABS software, with loading in accordance with the SNI 1726:2019, 1727:2020, and PPPURG 1987 standards. The analysis results show that the building structure can be said to be stable in checking the influence of P-Delta, but has not yet met the inelastic deviation permit limit. The performance point based on FEMA 440 obtained a value of 303.618 mm for the X direction and 285.934 mm for the Y direction. Meanwhile, based on FEMA 356, the displacement target obtained a value of 313.997 mm for the X direction and 295.493 mm for the Y direction. The ductility ratio in the X direction is 1.446 and for the Y direction is 1.42. In addition, an effective damping value of 5.88% was obtained for the X direction and 5.81% for the Y direction.
Keyword: ATC-40, earthquake, pushover analysis, structure performance

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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