10 research outputs found
PERILAKU GESER ELEMEN STRUKTUR BETON BERTULANG BERPENAMPANG LINGKARAN DENGAN VARIASI TULANGAN LONGITUDINAL
No full textSebagian besar penelitian yang dilakukan pada perilaku geser dari elemen struktur beton bertulang hanya difokuskan pada elemen struktur berpenampang persegi panjang. Padahal elemen struktur beton bertulang berpenampang lingkaran lebih sering digunakan daripada elemen berpenampang persegi untuk struktur seperti kolom, pilar jembatan, dan pondasi tiang. Hal ini dikarenakan penampang lingkaran memiliki karakteristik kekuatan yang identik dalam segala arah sehingga disukai dalam konstruksi sipil. Sejauh ini, beberapa peraturan tidak sepenuhnya menutupi penyediaan kapasitas geser dari beton bertulang dengan penampang lingkaran. Keakuratan dari peraturan yang ada harus diuji keamanannya dengan validasi menggunakan studi eksperimental, dikarenakan formulasi disain geser untuk penampang lingkaran dalam praktiknya berdasarkan pada formulasi disain geser untuk penampang persegi. Pada studi ini dilakukan pengujian eksperimental terhadap elemen struktur beton bertulang berpenampang lingkaran yang hanya dikenai beban lateral saja, selanjutnya disebut balok lingkaran. Eksperimen dilakukan terhadap 9 sampel balok lingkaran tanpa tulangan sengkang. Variabel benda uji terletak pada rasio tulangan longitudinal yang masing-masing sebesar 2.16%, 3.28% dan 4.62% serta pada mutu beton masing-masing sebesar 20.45 MPa, 21.57 MPa, dan 23.1 MPa. Pengujian sampel dilakukan dengan beam test menggunakan 2 beban terpusat monotonik (four point loading) hingga runtuh. Selama pengujian nilai beban yang menyebabkan retak serta beban maximum yang mampu ditahan oleh benda uji dicatat sejalan dengan pertambahan lendutan yang tejadi. Perbandingan antara kapasitas geser aktual yang diperoleh dari eksperimental dengan kapasitas geser nominal teoritis yang dihitung berdasarkan formula yang terdapat dalam empat peraturan beton di dunia dan satu formula empiris dalam literatur jurnal menunjukkan bahwa formula geser teoritis tersebut cukup aman dalam memprediksi kapasitas geser dari spesimen. Dari hasil pengujian eksperimental, sebuah usulan formula diberikan untuk memprediksi kapasitas geser balok lingkaran dengan menambahkan fungsi rasio tulangan longitudinal.
Kata kunci: Kapasitas geser, penampang lingkaran, peraturan beton, rasio tulangan longitudinal
Assessment of Reinforced Concrete Building for Disaster Reduction Strategy in Padang City, West Sumatra, Indonesia
No full textPadang 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
Rapid assessment of the public buildings after the February 25
No full textThe earthquake that occurred on February 25th, 2022 (6.2 M) and the aftershock in the West Pasaman Regency, West Sumatra Province has caused damages to infrastructure and community settlements. One of those affected by the Pasaman Earthquake 2022 are public buildings. To determine the level of public building damage, an assessment should be carried out before reoccupying the buildings. In this study, a rapid assessment of damaged public buildings was conducted after the Pasaman Earthquake by the Disaster Study Center of Andalas University team. The assessed buildings include the buildings of Balerong Hall, Ibnu Sina Hospital, Grand Mosque, Population and Civil Registration Agency (Disdukcapil) office, Regional Public Hospital, and Elementary School (SDN) 22 of Talamau. The results of the assessment show that in general, these public buildings have non-structural damages, such as cracks in the walls and ceiling crashes from their positions. Meanwhile, in the buildings of Elementary School (SDN) 22 Talamau, Grand Mosque, and Disdukcapil, it is found that there are some structural damages observed, such as cracks on the columns. The main factor causing the damage is the low quality of the concrete in the columns. Recommendations for repairing the damaged building are also discussed in this study
PEMAHAMAN MASYARAKAT TENTANG PERKUATAN RUMAH DENGAN MORTAR SERAT POLYPROPYLENE
No full textPasaman District is in West Pasaman Regency, along the coast of West Sumatra at 000°05' NL – 00°03′ SL and 99°38′ – 100° 58′ EL which is adjacent to the Mentawai subduction so that this area is vulnerable to earthquakes, as happened in 2009 which caused 9108 houses to be damaged. Extensive number of damaged houses was caused by the low strength of non-engineered building. Under the threat of Mega-Earthquake from the Mentawai fault, the low capacity of community houses against earthquake forces can be a threat to the community. This Community Partnership Program (PKM) offers a solution to reduce the risk of damage to houses in Pasaman District through training in the strengthening techniques using polypropylene fiber mortar. Based on observations in the field, generally people's houses in Pasaman District have walls made of red brick. Taking into account the technical ease of implementation, affordability of costs, availability of local materials, transfer of knowledge and the application of retrofitting techniques owned by the Department of Civil Engineering, Padang State University, the reinforcement technique for brick walls with Polypropylene Fiber Mortar Plaster will be used. The training was able to increase the community's understanding of house strengthening by up to 85%, which was previously 45.4%.Kecamatan Pasaman terletak di Kabupaten Pasaman barat, pesisir pantai Sumatera Barat pada 000°05’ Lintang Utara – 00°03′ Lintang Selatan dan 99°38′ – 100° 58′ Bujur Timur yang berdekatan dengan subduksi Mentawai sehingga memiliki potensi besar terdampak gempa bumi, seperi yang terjadi di tahun 2009 yang menyebabkan 9108 rumah masyarakat mengalami kerusakan. Kerusakan rumah yang besar ini diakibatkan oleh rendahnya kekuatan rumah masyarakat yang dibangun secara non-engineering. Dengan adanya ancaman Mega-Earthquake dari patahan Mentawai maka kapasitas rumah masyarakat yang rendah terhadap gaya gempa dapat menjadi ancaman bagi masyarakat. Program Kemitraan Masyarakat ini menawarkan solusi pengurangan risiko kerusakan rumah masyarakat di Kecamatan Pasaman melalui pelatihan teknik perkuatan rumah menggunakan mortar serat polypropylene. Berdasarkan pengamatan di lapangan, umumnya rumah masyarakat di Kecamatan Pasaman memiliki dinding yang terbuat dari bata merah. Dengan mempertimbangan kemudahan teknis pelaksanaan, keterjangkauan biaya, ketersediaan material lokal, transfer of knowledge dan pengaplikasian teknik perkuatan yang dimiliki oleh Jurusan Teknik Sipil Universitas Negeri Padang, akan diberikan pelatihan teknik perkuatan pada dinding bata dengan Polypropylene Fiber Mortar Plaster. Pelatihan mampu meningkatkan pemahaman masyarakat terhadap perkuatan rumah hingga mencapai 85%, yang sebelumnya sebesar 45,4%
Investigation of the accuracy of Digital Image Correlation (DIC) in measuring full-field strain for timber materials
No full textAs one of the most successful techniques in experimental mechanics, digital image correlation (DIC) has been widely used to measure the motion and deformation of solid materials, especially in situations where non-contact measurement is required. This study describes and provides a comprehensive overview of the application of DIC using the open-source platform Ncorr on orthotropic materials. Orthotropic materials are a subset of anisotropic materials; their properties depend on the direction in which they are measured. Deformation displacement and in-plane strain in two directions are extracted from digital image correlation using a reference image recorded during the experiment. Tests are carried out on Laminated Veneer Lumber timber specimens according to the ASTM standard to determine the mechanical properties of materials under compression. DIC has proven to be a reliable, consistent, and cost-effective non-contact deformation measurement method that can assist in the extraction of mechanical properties of orthotropic materials. This study also showed that DIC analysis with a natural timber grain can be used to measure the displacement and strain fields of the material
Analysis of Contractor's Knowledge Level about Construction Safety Management System Budget Plan Components (Case Study: Construction Project in Padang City)
No full textWork accident prevention is cheaper than responding responsively after an accident. Common problems are weakness and a lack of predicted levels of risk for a job that could potentially be a work accident. Risk Control is undoubtedly something that must be designed before the work is done. This control must be supported by costs to run a Construction Safety Management System (SMKK). The initial observations and references that have been conducted and collected indicate the problem that the financing does not appear in the Budget Plan of the contractors in several construction projects when participating in the tender auction at the research site, namely: The City of Padang. There are limitations of information media, socialization, and implementation instructions become challenges in running it. This fundamental problem gave rise to an idea to carry out research. This research has been conducted to explore the problem of the level of knowledge of contractors about the financing of smkk. The data in this study was obtained by survey, in detail, disseminating questionnaires online to samples, namely: contractors in the city of Padang. The questionnaire has been analyzed, resulted the level of knowledge of this contractor is quite good in the level of knowledge about the components of the budget plan of SMKK. There is no problem with the contractor's knowledge related to the budget plan, except: readiness and planning for the system of budget
Improvement of lateral property of unidirectional-strengthened CFRP laminates using recycled carbon fiber
No full textAbstract The unidirectional carbon fiber reinforced polymer (UD-CFRP) lacks the modulus of elasticity and strength in the lateral direction. This study investigates whether matrix resin with CFRP waste, recycled carbon fiber (rCF), can improve the lateral properties of CFRP. In total, twelve CFRP strips specimen were prefabricated of unidirectional carbon fiber (CF) sheet by hand lay-up (HLU) method and were tested by tensile test and X-ray computed tomography (X-ray CT). Factors such as fiber direction and void distribution significantly affecting its mechanical properties are assessed by X-ray CT inspection. It can be seen that rCF is mixed in a random direction at the position filled with matrix resin without rCF. However, a similar frequency of unimpregnation and voids can be observed in both specimens. Test results showed that experimental values of CFRP laminates with rCF-mixed matrix resin increased compared to the CFRP laminates without rCF. The percentage increase in the lateral tensile strength and modulus of elasticity of the rCFRP compared to the control specimen without rCF is 27.36% and 10.62%, respectively. This study proved that rCF can increase the lateral properties of unidirectional CFRP and shows the effective use of rCF for strengthening material in construction applications
Experimental Study of Masonry Wall Strengthened by Polypropylene Fiber Mortar
No full textBased 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
