42 research outputs found
Numerical Investigation into Size Effect on Prestressed Concrete Beam Resistance to Shear Tension Cracking
No full textIn the past, many researches on the topic of size effect on concrete structures were mainly focused on the phenomenon of size effect in flexural cracking. The result of those studies can be found today in the concrete structure design specifications of well-known building codes, such as the Eurocode. Nevertheless, the inclusions of the results of those studies into the design specifications are still minimum and therefore, it is necessary to conduct more studies on size effect, especially on other types of cracking. In this thesis, an investigation focused on the size effect in shear tension cracking at prestressed concrete beams was conducted. The model used for investigating the size effect is a prediction that a shear tension crack will occur when the principal tensile stress at a certain location on the web of a beam is equal to the concrete mean uniaxial tensile strength (σ1 = fctm). The investigation was conducted by studying premature shear tension cracking on a group of several I-profile prestressed reinforced concrete beams, called the trusted specimens, which were experimented by Hanson (1964), Choulli (2005), and Elzanaty (1986) under four-point bending tests. These tested beams were numerically investigated using linear elastic finite element analysis (LEFEA) with an aim to find the nearly realistic principal tensile stresses that caused the shear tension crack to initiate below the designated tensile strength of the beams. To study the size effect, the obtained principal tensile stress distributions were analyzed using two new approaches proposed by the author, namely the σ1 area approach and the ratio-of-distances approach. The σ1 area method is a technique for detecting a structural size dependency of the uniaxial tensile strength by comparing rectangles which areas represents a group of σ1 values that have a higher likelihood in achieving the deviated values of fctm and initiate shear tension cracking on the web of the trusted specimens. In contrast, the ratio-of-distances approach investigates the size dependency of the uniaxial tensile strength by observing the locations of σ1max where a shear tension crack initiated in the web of each trusted specimen under an assumption that a shear tension crack is more likely to originate from near the beam neutral axis instead of near the web-flange junction due to the change of thickness at that interface. In conclusion, the result of the investigation was presented. The σ1 area approach confirmed the presence of size effect in shear tension cracking at the trusted specimens by giving a relation that showed a tendency for the smaller specimens to have a higher resistance towards principal tensile stresses compared to the larger specimens. The ratio-of-distances result, on the other hand, implied that the approach has failed to detect the presence of size effect. In that result, the shear cracks from the smaller specimens and the shear cracks from the larger specimens had similar starting points locations, at which the σ1max was located. In addition, several recommendations are provided for future studies on size effect in shear tension cracking. It was recommended to do research this topic on different physical problems and shear tension cracking with the presence of flexural cracks.Civil Engineering | Structural Engineerin
Analysis of offshore platforms lifting with fixed pile structure type (fixed platform) based on ASD89
No full textEvaluating strut-and-tie models for concrete elements by nonlinear finite element analysis
No full textThe strut-and-tie method (STM) has been acknowledged as one of the most reliable tools for designing discontinuity regions in structural concrete. It is capable of producing safe designs consistently since it was developed as an extension of the lower-bound theorem of plasticity theory. However, to aptly address a physical problem of a concrete element, STM often relies heavily on engineering experience and intuition. It is because the current STM has an inability to be transparent in informing the nonlinear consequences of choosing a certain ST model design, which make the method to be troublesome in more complicated design tasks. In this thesis, a supplementary evaluation technique that employs nonlinear finite element analysis (NLFEA) is proposed as a solution. It is advantageous to incorporate NLFEA because it can provide nonlinear behavior of a structural concrete as objective insights for making a more informed decision in determining a suitable ST model. To incorporate NLFEA to STM, the concept of 'ties-as-extended-rebars' or TER model is introduced. A TER model is a numerical model used to assess the influence of a certain ST model design toward the nonlinear behavior of a concrete element. Through a TER model, an ST model is nonlinearly evaluated as a concrete element with embedded reinforcements. Additionally, to allow the TER model to generate a representative failure, the rebars in the TER model are extended with straight anchorage length. Then, the information generated by the model, i.e. failure mode and ultimate capacity, can be utilized as additional information to find a fitting ST model. To assess its ability, the proposed technique was implemented on six ST models generated for two complex concrete beam elements. The implementation provided the TER model versions of the ST models. At the same time, the experimental results of the ST models were also validated using NLFEA. The validation attempt generated six numerical validation (NV) results, which were then compared with the TER model results. The result of the comparison indicated that five out of six TER models were able to suggest failure mode and ultimate capacity (RTER) that are comparable with the failure mode and ultimate capacity (RNV) from the NV results. In more detail, RNV to RTER ratio of models with similar failure mode has an average of 1.04 and a coefficient of variation of 11.1%, which suggests that the proposed technique can provide representative ultimate capacity value with relatively low variability.Civil Engineering | Structural Engineerin
Analisis Peranan Customer Service Terhadap Loyalitas Nasabah Menabung Di Bank Syariah Indonesia (Studi Kasus Bank Syariah KCP Binjai Jamin Ginting)
No full textThis is a new author's manual and a template for Jurnal Dirosah Islamiyah. Published every May and November since 2019. Articles must start with Article Title followed by Author Name and Affiliate Address and abstract. This part of the abstract must be typed in 150-250 word counts. Especially for the abstract, use the Cambria font, measuring 10 pt. Single space per line in this article. If the article is written in Indonesian, the abstract should be typed in English and Indonesian. Meanwhile, if the article is written in English, the abstract must be typed in English only. The abstract is typed as concisely as possible and consists of: research objectives, methods, results and discussion and brief conclusions. 250 words maximum. Abstract should only be typed in one paragraph and in one column format
PELAKSANAAN PERHITUNGAN, PEMOTONGAN, PENYETORAN, DAN PELAPORAN PAJAK PENGHASILAN PASAL 4 AYAT 2/FINAL ATAS TRANSAKSI PENJUALAN SAHAM DI BEI PADA PT. BOSOWA SEKURITAS ATAS NAMASIERLY SUGIANTO MASA PAJAK JULI SAMPAI DENGAN SEPTEMBER 2015
No full textThis study discusses the 4 paragraph 2 / final income tax in the capital market sector, the implementation of the calculation, deduction, depositing and reporting of final PPh on the sale transaction of shares on the Indonesia Stock Exchange at PT.Bosowa Sekuritas on behalf of sierly sugianto. The author collects data by conducting interviews with the employees and customers concerned for stock sales transactions carried out every day during the exchange working hours and comparing them with regulations and laws that discuss the implementation. It turns out that the process of calculating, deducting, depositing and reporting the final PPh on the share sale transaction has been carried out by the Indonesia Stock Exchange, assisted by PT. Bosowa Securities, which runs well and in accordance with established regulations. Overall the process of implementing the calculation, deduction, depositing and reporting of final PPh on the sale of shares in the Indonesia Stock Exchange at PT.Bosowa Sekuritas is in accordance with applicable standards and laws in Indonesia, except that there is little negligence when storing data concerning stock sale transactions
Kualitas Pelayanan Penerbitan Kartu Tanda Penduduk Elektronik Pada Dinas Kependudukan Dan Catatan Sipil Kabupaten Rokan Hilir
No full textThis study aims to determine and explain the quality of electronic ID card issuance services at the Population and Civil Registry Office of Rokan Hilir Regency, while the indicators that the author uses in this study are 5 (five), namely; Reliability, Responsiveness (Responsiveness), Assurance (Guarantee), Tangible (tangible), and Empathy (Empathy) and the place of this research is located in Disdukcapil Rokan Hilir Regency and this research uses a descriptive survey method where the author conducts research directly to Disdukcapil Regency Rokan Hilir in order to get a phenomenon that comes from actual facts, if the researcher uses the type of research with interviews, observations and documentation of the theory used in this study, namely the theory of Zeithaml (1990:25). The results of the study concluded that in providing services to the community there was still a lack of good access to the Disdukcapil office in the downstream Rokan district such as network access, waiting rooms and lack of availability of blanks as well as lack of employee awareness such as because they still left their duties during working hours in providing services to the community. on the issuer of the electronic ID card of the Population and Civil Registry Office of Rokan Hilir Regency. Based on various meetings obtained by the author in the field and from the conclusions of this researcher, it is necessary to increase employee discipline so as not to leave his job during working hours. It is advisable to provide an explanation of the requirements set by the Disdukcapil of Rokan Hilir Regency. Employees need to be responsive and responsive to people doing this. in every business, especially in the issuance of Electronic Identity Cards
Urgensi Sumber Daya Alam dalam Ekonomi Islam
No full textIn the Koran, nature is described as a book compiled by a wise being, whose every line and word is a sign of the wisdom of its author. Of course, nature can no longer be separated from social life. Economic activities and social life are two interrelated things. In this case, economic activity is a human activity in order to fulfill all his life needs. In general, there are three types of economic activities, namely: production, distribution and consumption. These three things are mutually sustainable. In this modern era, economic activities are greatly influenced by government intervention and policies. Apart from that, this economic activity is influenced by natural resources, human resources, management systems and so on
Urgensi Sumber Daya Alam dalam Ekonomi Islam
No full textIn the Koran, nature is described as a book compiled by a wise being, whose every line and word is a sign of the wisdom of its author. Of course, nature can no longer be separated from social life. Economic activities and social life are two interrelated things. In this case, economic activity is a human activity in order to fulfill all his life needs. In general, there are three types of economic activities, namely: production, distribution and consumption. These three things are mutually sustainable. In this modern era, economic activities are greatly influenced by government intervention and policies. Apart from that, this economic activity is influenced by natural resources, human resources, management systems and so on
SISTEM PAKAR DIAGNOSA PENYAKIT KANKER PADA ANAK MENGGUNAKAN METODE CERTAINTY FACTOR
No full textKanker can happen to anyone regardless of age groups, including children, then the parents need to know the disease early on. According to data from the World Health Organization (WHO) kanker patients every year in the world to be 6.25 million people, and of that number, 4 percent or 250 thousand patients are children (as per February 2011). Expert systems are computer programs that imitate the reasoning an expert with expertise in a particular area of knowledge (Turban, 1995). Expert systems try to find solutions, providing suggestions or conclusions are consistent with the problems it finds.The author managed to implement an expert system that can cope with the highest degree of confidence or certainty factor data obtained from the results of the consultation with the patient through the certainty factor method. Hope the author, this system can help doctors or people who know even less in making decisions when diagnosing kanker in children
