Pengaruh Abu Dasar (Bottom Ash) sebagai Bahan Substitusi Pasir pada Sebagian Sifat Beton Segar dan Beton Keras

The research is a continuation of previous research that aims to obtain the characteristic of fresh and hard concrete using bottom ash as substitute material sand on normal concrete. At this stage of research focused on analyzing the bulk density, workability, permeability and sulfate resistance. The percentage of bottom ash waste that is used are 0% and 30% of the weight of the sand. The results show that using 30% of bottom ash decrease the workability and bulk density on concrete. Meanwhile, the use of 30% bottom ash also increase the value of permeability on the concrete. On testing of sulfate resistance, concrete with 0% of bottom ash increases the compressive strength at age of 28 days, then will decrease at the age of 56 days and 90 days. As well as on the concrete with 30 % of bottom ash, the compressive strength decreases at the age of 56 and 90 days

Perbandingan Kapasitas Sambungan Balok -Kolom Konvensional dan Pracetak Sistem Rigid Joint Precast (RJP) (Studi Kasus Gedung Rumah Susun Sederhana Sewa Pekanbaru)

Precast system is a system which offers quality controlled implementation, they are neat, fast and economical, thus included systems that fiil the criteria for green construction. Precast concrete construction has many advantages than conventional systems. The advantage of this system are, quality assured, fast and massal production, rapid development, environmentally friendly and tidy with good product quality. For buildings precast system have been researched, developed, applied and proven reliability by the Ministry of Public Works and the various national construction industry since 1995, especially in support of the development program of massal simple flat throughout Indonesia. One of the buildings using precast system is building Rusunawa Pekanbaru. This Rusunawa using RJP-type system of precast concrete. Part of the concern is a precast system on beam-column connections. Beam-column relationship is a critical area in the event of earthquake loads. Earthquake load has a complex effect on the structure. In this study has compared the moment capacity between conventional beam-column connections with precast type of RJP. The results are there differences in the precast concrete RJP peak voltage at the connection angle (A), exterior (B) and interior (C) in the amount of 53.85 MPa, 54.31 MPa and 54.31 MPa. RJP moment the total capacity are equal to A = 140.35 kN.m, B = 116.96 kN.m and C = 116.96 kN.m. Peak voltage difference and the connection moment capacity caused by configuration differences longitudinal reinforcement

Respon Struktur Portal Baja Akibat Beban Gempa dengan Analisis Riwayat Waktu Nonlinier

Earthquakes are dynamic loads that greatly affect the state of the building structure. If the strength of the building can not withstand the dynamic load, then the building will be damaged even will collapse. The purpose of this study was to identify the structural response in the Indonesian quake region by using nonlinear dynamic analysis. Structural modeling using Banda Aceh, Bengkulu and Pekanbaru earthquake locations with medium soil condition on a 10-storey building made of steel with a constant inter-floor height of 4 m. Time history analysis in earthquake plan using 3 accelerated earthquake accelerator, namely: Kobe, Imperial Valley and Chichi earthquake. Each earthquake accelerator was given three treatments: 1). The earthquake scale is decreased by 50% (0.5 g), 2). Normal earthquake scale (1 g), and 3). The scale of the earthquake is increased by 200% (2 g). The analysis results show that the displacement, velocity, and acceleration of earthquake-load structures in each region are directly proportional to the increasing or decreasing of the earthquake-scale in buildings that do not occur in plastic joints

Korosi Baja Tulangan pada Beton OPC, PCC, dan OPC POFA di Lingkungan Air Garam

This paper presents the results of an experimental investigation on the steel reinforcement corrosion and sorptivity. Concretes having three type of cements (OPC, PCC, and a mixtured of palm oil fuel ash). The effect of using blended cements on the resistance of concrete against damage caused bycorrosion of the embedded reinforcement has been investigated using an halfcell potential (ASTM C876). PCC concrete showed high resistance against damage by corrosion of the steel reinforcement

Keruntuhan Progresif Gedung Struktur Beraturan dan Tidak Beraturan

This research aimed to examine the progressive collapse of regular and irregular structural building. This research conducted by analyzing the structural elements that were first destroyed due to addition of gravity load and lateral load of the earthquake. This analysis conducted by removing one or more critical columns with General Services Administration (GSA) guide. Examination of structural strength using finite element software based Demand Capacity Ratio (DCR) value. The regular structure will have progressive collapse if the DCR>2 and irregular structure will have progressive collapse if the DCR>1,5. Progressive collapse occurs when removal of five critical columns on the side of the regular structure, with the largest of DCR value is 4,665. In irregular structure, progressive collapse occurs when removal of four critical columns in middle of horizontal side of structure with the largest of DCR value is 3,44375. The analysis results show progressive collapse did not occurs when removal of single column from GSA guide. Progressive collapse only occurs after removal of some critical columns in pushover analysis results. This show that the structure is still capable to carrying the load when remove single column, but the structure is unable to carrying the load when some critical column were removed. Based on the deformation, the regular and irregular structures analyzed have progressive collapse of domino type. The value of robustness indicator is almost equal one, that indicated the load distribution is normal despite of the damage structure

Keruntuhan Progresif Gedung Beraturan Sistem Ganda

This research aimed to examine the progressive collapse of dual system building structures due to the loss of one or more structural elements that lead to successive collapse of other elements. Three cases of building structures were analysed in this study using finite element software. Several columns on the first floor of the structure was removed and then the analysis was conducted to each structure until the progressive collapse existed. The nonlinear statics analysis was used to examine the location of the critical column while the linear statics analysis was carried out to find the demand capacity ratio, the bending moment ratio and robustness indicator as suggested by GSA 2003 and SNI 2847-2013. The results showed that the structure denoted in case 1 and case 2 that was loaded comply with GSA 2003 experienced the progressive collapse. On the other hand this phenomenon did not appear on the structure that was loaded in accordance with SNI 2847-2013. Furthermore, there was an increase in the bending moment capacity of the column/beam on all cases that were loaded comply with SNI 2847-2013 and GSA 2003. Robustness indicator is almost equal one with the type of progressive collapse is pancake collapse type