The destructive earthquakes occurred in Sumatra are dominated by medium earthquakes, which generally come from the Sumatra fault and to have a direct impact on the land, buildings and around residential buildings. These earthquakes can be classified into high-frequency earthquakes with low-vibration periods. The hazards caused by the earthquake are mostly from damage and collapse of the residential buildings. This study is a literature review that aimed to observe the characteristics of rocks and ground in Sumatra areas based on b-value that obtained using seismicity estimation is related to the resistance of the earthquake on residential buildings. The b-values obtained from some previous researches so that they could be concluded, and then analyzed the type and condition of the local ground and then evaluated its effect on the surrounding buildings. Based on the outcomes, the estimation of b-value seismic parameters in Sumatra was found 0.34 to 0.5. It means that the type of ground in areas of Sumatra has a hard rock layer. Physically, it has highfrequency earthquake waves; low vibration periods, spreading efficiently on hard layer and having a direct impact on local buildings consequently the risk of collapse building will be higher.
Earthquake events caused thousands of families to be displaced, some inside refugee camps, others living in relatives’ houses, besides causing the stages of government, economy and Social Stage to experience many obstacles. Reconstruction implementation Community-based housing is the backbone for sustainable development. Through this approach, it is hoped that people can realize the importance of building a building using earthquake resistant building structures. Based Deskriftive analysis and factor analysis, there are 18 (eighteen) the risk of pre-construction project of housing reconstruction after the earthquake based society including the risk of unexpected (Undesirable). From 8 (eight) Stages of pre-construction phase of the housing reconstruction is 1 (One) Stages of risks are still acceptable namely Stages 6 (Stages of Establishment of Community Organizations). The greatest risk is in Stage 8 is R.8.16. The price of Building Materials which has the biggest risk value is: 5.389. With this risk analysis it is hoped that the parties concerned can pay more attention to the risks that have high value (categorized as an unexpected risk)”.
Perencanaan gedung bertingkat harus dibangun sesuai dengan standar ketahanan gempa, agar tidak menyebabkan jatuhnya korban jiw terhadap manusia yang ada di dalamnya. Penelitian ini dilakukan untuk menentukan gaya geser beban lateral terhadap gedung RS H. Hanafie yang terdapat di Kabupaten Muaro Bungo Provinsi Jambi. Metode yang digunakan adalah metode analisis statik ekivalen dengan hasil penelitian diperoleh gaya geser arah X=3,85 kN dan arah Y=57,23 kN pada periode 1 detik.
One of the concrete technologies developed to obtain good compressive strength of concrete is additional material for iron lathe waste obtained from the residue of the iron turning process. This study aims to determine the effect of iron lathe waste as a fine aggregate additive on the compressive strength of concrete. The compressive strength test of concrete was carried out based on The SNI standard 1974:2011. The sample making of the specimens was carried out by varying 0%, 1.5% and 2.5% of iron lathe waste from the weight of fine aggregate in a concrete mixture with a concrete compressive strength of 29.05 MPa. Concrete samples were tested at the age of 7 days, 14 days, and 21 days. The test results show that the maximum compressive strength of concrete is achieved by normal concrete (0%) which is 28.96 MPa at the age of 21 days of concrete. While the value of the compressive strength of concrete after being given a mixture of iron lathe waste decreased. The optimum concrete compressive strength with the addition of iron lathe waste was obtained at 24.63 MPa with a mixture of 1.5% at the age of 21 days of concrete. The decrease in the compressive strength of concrete due to the addition of iron lathe waste. It occurs because of the air trapped in the concrete, causing the concrete to be hollow and not solid, so that the compressive strength of the concrete decreases. Keywords: Fine aggregate, Strength of concrete, Waste iron, Concrete technology.
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