The use of bio-based material for repairing concrete is a relatively new method. Therefore, more results from simulated real-condition experiments are needed before being applied on a practical scale. In the recent past, several studies have been conducted on the improvement of bio-based repair materials. In this study, the bio-based material involving yeast, glucose, and calcium acetate mixed in a Tris buffer solution showed the potential to develop a microbial process leading to the precipitation of calcium carbonate. We investigated the factors affecting the precipitation rate of the calcium carbonate of bio-based materials for repairing leakage in the concrete specimens. Based on a series of experiments involving temperature, the type of dry yeast, and the concentration of the Tris buffer solution, the composition of bio-based materials with the highest precipitation rate of calcium carbonate was selected. The selected mixture could be applied to repair leakage of concrete until the cracks are sealed entirely.
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%.
Indonesia merupakan wilayah yang berada pertemuan tiga lempeng aktif yaitu, lempeng Indo-Australia, Eurasia, dan Pasifik dan juga berada pada jalur cincin api atau ring of fire, menyebabkan sering terjadinya gempa bumi di Indonesia. Dalam perencanaan bangunan seperti Sistem Rangka Pemikul Khusus (SRPMK) yang merupakan bagian dari Sistem Rangka Pemikul Momen (SRPM) yang memang digunakan pada wilayah dengan resiko tinggi terhadap gempa bumi. Proses perancangan suatu bangunan gedung maupun non gedung menggunkan aplikasi penunjang Teknik Sipil seperti, untuk menganalisis struktur bangunan menggunakan aplikasi SAP 2000 atau ETABS. Adapun tujuan dari tugas akhir ini adalah membuat sebuah aplikasi komputer untuk perhitungan kebutuhan baja tulangan untuk menahan momen lentur pada SRPMK dengan menggunakan bahasa pemrograman Visual Basic.Net versi 2013.Berdasarkan hasil validasi yang dilakukan terhadapap pruduk berupa aplikasi DSB SRPMK didapatkan dari rumus validitas percentages correction nilai persentase dari ahli materi sebesar 80% dengan kategori kelayakan ‘Baik’ dan untuk ahli media didapatkan nilai persentase sebesar 93.4% dengan kategori kelayakan ‘Sangat Baik’. Sedangkan dari hasil perbandingan ketiga software yang digunakan untuk pembanding hasil perhitungan kebutuhan baja tulangan pada elemen stuktur balok SRPMK dengan menggunakan aplikasi SAP 2000, Microsoft Excel, dan aplikasi DSB SRPMK, didapatkan nilai persentase sebesar 95% dengan kategori kelayakan ‘Sangat Baik’.
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