Padang City, West Sumatra province is one of the most vulnerable cities in the west coast of Indonesia. Together with the increase in population in Padang City, the number of the building is also increasing. Meanwhile, researchers predicted that Padang City is facing the impendence of mega-earthquake with magnitude more than 8 in scale Richter (SR). The last Earthquake with magnitude 7.6 SR caused fatality with more than 1200 people died and almost 3000 others were injured. Most of the victims injured due to the collapse and damage of buildings, especially the Reinforced Concrete (RC) structure. To reduce the damage due to seismic load as the preparation for the future earthquake, the assessment of the element at risk subjected to the seismic load in Padang City is essential. The predominant building typology in Padang City is RC building. Using the Applied Element Method that can show structural response till collapse state, has been simulated typical low-rise RC infilled wall building in Padang City with the consideration of its different on concrete quality based on local concreting workmanship. Incremental Dynamic Analysis (IDA) by using some ground motion has been used to observe the structural response. The damage states and damage pattern has been judged based on HAZUS criteria. The results show that local compaction method affected the concrete compression quality, that also influences the building performance which is subjected to earthquake loads.
Kuat tekan mortar merupakan parameter utama untuk menentukan kualitas mortar. Kuat tekan didefinisikan sebagai perbandingan antara beban yang diberikan dan luas penampang sampel mortar yang diuji, yang dinyatakan dalam kg/cm². Sedangkan pengujian kuat tekan batu bata merah dilakukan untuk mendapatkan nilai kuat hancur,yang merupakan perbandingan antara beban maksimum yang diberikan sampai batu bata merah hancur. Penelitian ini merupakan penelitian eksperimental tentang kuat tekan mortar dan kuat tekan pasangan bata dengan penambahan serat Polypropylene. Sampel uji mortar adalah kubus berukuran 5 cm x 5 cm x 5 cm. Ada lima puluh sampel mortar yang dihasilkan dari pengujian ini. Lima sampel untuk setiap mortar dan mortar normal dengan penambahan persentase serat polypropylane yang berbeda. Persentase yang digunakan antara lain 0,5%, 1%, 1,5%, 3%, 8%, 13%, 18%, 23%, dan 28% dari berat semen. Beban maksimum yang dapat diangkut adalah 3656 kgf dengan kuat tekan rata-rata mortar normal 146,24 kg/cm2 dan beban maksimum yang dapat ditahan oleh mortar serat polypropylane 8% adalah 4082 kgf dengan kuat tekan 163,28 kg/cm2. Hasil penelitian menunjukkan bahwa penambahan serat polypropylene 8% meningkatkan kuat tekan mortar.
The development of computational technology has provided convenience in structural planning to calculate earthquake loads acting on structures. This study aims to compare the results of the equivalent static earthquake load calculation using the existing methods in SAP 2000, with manual calculations based on SNI 1726 2019. This study will compare the base shear and story shear in a five-story building with a symmetrical building configuration and located in the city of Padang. The results of the comparison of the base shear using the SNI 2716 2019 method and the user load method produced the same value, namely 2441,707 kN, while the user coefficient method and the ASCE 7-16 method had a difference of 2.02% and 2.11% base shear values. For story shear calculations, the SNI 1726 2019 method with the user load method produces almost the same value with a difference of 0.002 to 0.004%. However, for story shear, the user coefficient method and ASCE 7-16 provide differences for the 5th floor, namely 7.25 and 5.94%, while for the 1st floor to the 4th floor the difference is only 3.67% to 2.70%.
Kerusakan yang sering terjadi pada dinding bata adalah kerusakan geser yang dicirikan dengan adanya retak atau patahan searah diagonal bidang dinding bata. Kerusakan geser pada suatu bangunan harus sangat dihindari, hal ini disebabkan sifat dari keruntuhan geser yang tiba-tiba dan getas. Apabila suatu bangunan mengalami keruntuhan geser maka bangunan tersebut dapat secara tiba-tiba runtuh dan akibatnya penghuni tidak sempat untuk menyelamatkan diri. Untuk mengatasi keruntuhan geser yang teradi pada dinding bata perlu diberikan perkuatan. Pada penilitian ini akan dilakukan pengujian terhadap dinding bata yang diberikan variasi penambahan jaring kawat. Terdapat sembilan buah sampel dengan ukuran 35 cm x 35 cm yang akan dilakukan pengujian geser diagonal dinding bata, sampel tersebut 3 buah sampel dinding bata tanpa penambahan jaring kawat (DBK), 3 buah sampel dinding bata dengan penambahan jaring kawat 0,5” x 0,5 “(DBJK A), dan buah sampel dinding bata dengan penambahan jaring kawat 1”x1”(DBJK B). Pengujian geser diagonal dinding bata merah menggunakan alat UTM dilaboratorium. Dari hasil pengujian dapat dilihat bahwa penambahan jaring kawat memberikan kontribusi peningkatan kemampuan dinding bata untuk menahan beban . terjadi peningkatan kekuatan sebesar 68,66 % dan 29,55 % antara dinding bata tanpa jaring kawat dan dinding bata dengan penambahan jaring kawat. Selanjutnya dilakukan pengolahan data untuk mendapatkan nilai kapasitas geser dinding bata. Terjadi peningkatan kapasitas geser dinding bata sebesar 68,42 % dan 29, 47 % dari dinding bata tanpa penambahan jaring kawat.
Based on previous studies, the average strength of Indonesia's masonry wall shows a weak compressive strength that increases the vulnerability of buildings with masonry walls towards the seismic load. This study presents an experimental investigation of the masonry wall's flexural capacity strengthened with Polypropylene Fiber (PP Fiber). In general, the experiments were divided into two groups: the masonry wall with PP Fiber in a joint mortar and the masonry wall with PP Fiber in a plastering. The investigation was carried out on twelve specimens. The specimens consisted of three standard masonry wall (DBK) samples as the controlled specimens, which are without plastering and PP Fiber, three masonry wall samples with PP Fiber (DBP) in a joint mortar, three masonry wall samples with normal plastering (DBKP), and three masonry wall samples with PP Fiber in a joint mortar and plastering (DBPP). The experimental investigation proved that the addition of PP Fiber to the mortar mixture at joint masonry mortar could increase the masonry wall's flexural capacity. The results showed that the mortar with 8% PP Fiber improves the compressive strength by 58.46%. The flexural testing showed that 8% PP Fiber to the mortar could increase the flexural capacity to 35.8%. The maximum deflection also increases as much as 38.58% for masonry walls with PP Fiber on mortar and plastering, compared to the masonry wall without PP Fiber. In addition, the presence of Polypropylene Fiber contributes to give a higher flexural capacity.
Crack Detector – The Crack Detection In The Snotty Building Based Artificial Intelligence And Image Processing Smart Solution To Structural Collapse is a device designed by the building's design team by implementing artificial intelligence science and image processing to detect the cracks and dimensions autonomous. Data obtained was sent to the user's computer in real time. The purpose of the construction of the device is to facilitate communities especially construction and construction safety committees (KKK) the building's security system hopes to detect cracks in high rise and can provide data on the level of damage, data obtained from a crack detector among other images and videos from the state of the building, the dimensions of cracks and the positions of cracks. Based on these data can be determined an ordinance of the building structure. Toolmaking begins with observing a multistory building on the campus and a literature study of both national and international journals and books. Next is the tool design using Solidworks 2020. Once the design is finished it continues to the stage of procuring the components needed to make the prototype. The building of the prototype is divided into three stages of assembly of the frame, assembly of the electronic components and program building. Once completed, the tool was tested for performance knowing.
Baja ringan sudah mulai berkembang untuk digunakan pada struktur-struktur yang lebih besar. Salah satu cara untuk meningkatkan kekuatannya adalah dengan menggabungkan atau merakit dua buah profil sehingga membentuk penampang terbuka (open sections) dan penampang tertutup (closed sections). Namun, untuk merakit struktur baja ringan tersebut diperlukan sambungan yang dipasang pada bagian baja ringan seperti pada bagian badan (web) atau sayap (flange). Penelitian ini bertujuan untuk menganalisa pengaruh sekrup terhadap struktur baja ringan rakitan penampang terbuka (open sections) setelah titik leleh terlewati atau fase inelastik. Penelitian ini dilakukan dengan menguji 3 buah sampel baja ringan rakitan profil kanal C 75.75 penampang terbuka yang disambung menggunakan sekrup pada bagian badannya. Jumlah sekrup yang digunakan pada setiap sampel adalah 2, 3, dan 4 buah sekrup. Pengujian dilakukan dengan mesin UTM dengan skema pembebanan three-point bending yang secara otomatis mengeluarkan grafik beban dan lendutan. Analisa terhadap pengaruh sekrup ini ditinjau berdasarkan grafik tersebut serta pengamatan selama pengujian dilakukan. Hasil dari analisa terhadap pengaruh jumlah sekrup terhadap baja ringan rakitan pada fase inelastic adalah adanya pengaruh aksi komposit seperti slip pada bagian badan serta meningkatkan kekakuan torsi (torsional rigidity) dari penampang terbuka. Namun, pengaruh sekrup tidak begitu signifikan terhadap besarnya momen ultimate (Mu) yakni hanya 7,7%
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