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12.15: Structural performance of stainless lap bolted joints

ce/papers 2017年第2-3期1卷

作者： Raphael Freire Pedro Colmar Gonçalves da Silva Vellasco André Tenchini da Silva Luciano Rodrigues Ornelas de Lima PGECIV – Civil Engineering Post-Graduate Program State of Rio de Janeiro – UERJ Structural Engineering Department State University of Rio de Janeiro – UERJ

The stainless steel employed in the structural elements present high corrosion resistance, durability, fire resistance and high aesthetic value compared to those constructed using carbon steel. In contrast, the stainless steel structures design is made following the requirements based on the carbon steel analogies. In fact, the structural performance of stainless steel is complex and dissimilar where some stainless grades presenting nonlinear tension versus strain curves without a defined yield plateau and large strain hardening. These properties influence on structural performance of the lap bolted joints. The Eurocode 3 pt. 1.4, one of the most adopted design codes, recommends two structural design criteria for the stainless steel elements under tension: ultimate resistance of the net cross-section at holes or plastic resistance of the gross cross-section. The present work aimed to investigate the structural response of lap bolted joints made of three stainless steel grades: austenitic, ferritic and duplex. Nonlinear numerical analyses has been carried out using ABAQUS 6.14 program where the response have shown a good agreement in terms of the maximum loads and failure modes when compared to the performed experiments. The results indicated a conservative level of safety from Eurocode 3 pt. 1.4 code provisions in comparison to the experimental results.

关键词： stainless steel lap bolted joint experimental analysis numerical finite element simulations

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Road infrastructure asset management strategy and its impact on the environment

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IOP Conference Series: Materials Science and engineering 2020年第2期830卷

作者： K Priyatiningsih M Sutrisno Lecturer of Asset Management Study Program Politeknik Negeri Bandung Bandung 40012 Indonesia Student of Management Science Doctoral Program School of Post Graduate Universitas Pendidikan Indonesia Bandung Indonesia Lecturer of Civil Engineering Politeknik Negeri Bandung Bandung 40012 Indoenesia

The development of the economic sector is determined by services to the public through reforms that aim to place public satisfaction through the management of road infrastructure assets. Some research on road infrastructure assets still requires a deepening of studies related to the delivery of public services related to asset management systems. The purpose of this study is to find an appropriate road infrastructure asset management strategy through an integrated asset management system and asset management policies that can provide public satisfaction. This comprehensive approach to management strategies ensures that the performance of service provider assets is in line with the expectations of stakeholders including road users. This descriptive qualitative research is based on the perspective of road users as respondents, consisting of vehicle drivers from 50 transportation companies (people or goods) through interviews and observations. The results show aspects of asset performance based on the user's perspective there are five aspects, namely productivity, efficiency, effectiveness, use of resources and institutions and this performance is integrated in the asset management system related to policies from the management authority through service delivery namely quality and mobility, risk and use and maintenance of resources. The conclusion of this research is that road infrastructure asset services can be improved through the concept of road infrastructure asset management strategies in an integrated management system with five aspects of performance and more directed towards asset management policies related to the provision of road infrastructure asset services.

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Determination of the bridge maintenance and rehabilitation priority scale in kabupaten Pinrang

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Journal of Physics: Conference Series 2017年第1期795卷

作者： Asrul Nurdin S.A Kristiawan Handayani Dewi Civil Engineering of Post Graduate Program Sebelas Maret University Jl. Ir. Sutami 36A Kentingan Jebres Surakarta 57126 INDONESIA

This study attempts to get the support system to help stakeholders and the decision makers in the determination of priorities the maintenance and rehabilitation of the *** location of the study is done in Kabupaten Pinrang. Bridge damage value is specified using assessment standard Bridge Management System (BMS). There are 13 Bridges by details as follows: good condition with the condition 1 in 6 Bridge, damaged with the condition two as many as five fruit Bridges and there are two Bridges by value condition of three which means need handling rehabilitation. From our observation examination Bridges and it has been obtained the results of then afterward determined the priority scale by using the method Analytic Hierarchy Process. The discussion or interview of 27 respondents in completion question to determines the priorities of handling bridges by three (3) criteria and three sub- criteria with weights each: a condition of damage with weights 0,491 or amounting to 49,1 % followed by criteria policy with weights 0,324 % then criteria volume traffic weight of 0,185 or 18.5 %. Based on the results of this can be concluded that the implementation of a method of Analytic Hierarchy Processing is effective in determining the scale of priorities for the stakeholders. Having acquired value bridge condition and weights of the assessment results of the, then is needed to Analysis of spatial use application ArcGIS to obtain information condition Bridge Map.

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Employing Galerkin method and field study for model calibration to perform sediment transport modelling in Agathis Lake, Universitas Indonesia

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AIP Conference Proceedings 2018年第1期2014卷

作者： Rian Mantasa Salve Prastica 1Master Student Graduate Program of Civil Engineering Department Universitas Indonesia Kampus UI Depok West Java Post code 16424 Indonesia

The increasing of urban development and the decreasing of public awareness to environment promote flood every year for urban cities. Several lakes or ponds are sacrificed due to both urban development and landfilling. Bad habit of society to throw garbage to the lakes affects the society to think that the economic value of lakes could be increased by filling them with the land. These lead to make the lakes become vulnerable to sedimentation from urban activities. Universitas Indonesia as educational institution starts to develop how to manage sedimentation by hydrodynamics and sediment transport modelling. The research uses Resources Modelling Associates (RMA) program to run the model and Agathis Lake as the study area to perform the simulation. It is expected that the program output data could represent the field data, so the validation method should be conducted. The issue to validate the data would be problematic if simulation factors data could not accommodate real-world observed data. This study aims to employ Galerkin method to understand finite element method in Resources Modelling Associates program (RMA) in order to avoid black box when using it and to conduct a field study to perform calibration method of sediment transport modelling in the study area, Agathis Lake that is located in Universitas Indonesia.

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Energy efficiency evaluation of hospital building office

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Journal of Physics: Conference Series 2017年第1期795卷

作者： Indah Fitriani Senot Sangadji S.A. Kristiawan Civil Engineering Post graduate Program Sebelas Maret University Jl. Ir. Sutami 36A Kentingan Jebres Surakarta 57126 INDONESIA

One of the strategy employed in building design is reducing energy consumption while maintaining the best comfort zone in building indoor climate. The first step to improve office buildings energy performance by evaluating its existing energy usage using energy consumption intensity (Intensitas Konsumsi Energi, IKE) index. Energy evaluation of office building for hospital dr. Sayidiman at Kabupaten Magetan has been carried out in the initial investigation. The office building is operated with active cooling (air conditioning, AC) and use limited daylighting which consumes 14.61 kWh/m2/month. This IKE value is attributed into a slightly inefficient category. Further investigation was carried out by modeling and simulating thermal energy load and room lighting in every building zone using of Ecotect from Autodesk. Three scenarios of building energy and lighting retrofit have been performed simulating representing energy efficiency using cross ventilation, room openings, and passive cooling. The results of the numerical simulation indicate that the third scenario by employing additional windows, reflector media and skylight exhibit the best result and in accordance with SNI 03-6575-2001 lighting standard. Total thermal load of the existing building which includes fabric gains, indirect solar gains, direct solar gains, ventilation fans, internal gains, inter-zonal gains and cooling load were 162,145.40 kWh. Based on the three scenarios, the thermal load value (kWh) obtained was lowest achieved scenario 2 with the thermal value of 117,539.08 *** final results are interpreted from the total energy emissions evaluated using the Ecotect software, the heating and cooling demand value and specific design of the windows are important factors to determine the energy efficiency of the buildings.

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Sugarcane bagasse ash-portland composite cement blended in paving blocks production for effective resource utilization between sugar and construction industries

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AIP Conference Proceedings 2024年第1期3110卷

作者： Parea Rusan Rangan Miswar Tumpu Yohans Sunarno Mansyur Mansyur Civil Engineering Department Faculty of Engineering Christian University of Indonesia Toraja Indonesia Disaster Management Study Program The Graduate School Hasanuddin University Makassar Indonesia Civil Engineering Department Faculty of Engineering SembilanBelas November University Kolaka Indonesia

This study examines the compressive strength and water absorption of sugarcane bagasse ash, an ingredient in the manufacture of paving blocks. The technique employed was lab experiment printouts that were 20 10 8 cm in size. In this investigation, the addition variations consisted of 2.5%, 5.0%, 7.5%, 10.0%. In this investigation, test ages of 3, 7, 14, 21, and 28 days were used, using a cement to sands ratio of 1:4. Using SNI-03-0691-1996 with reference to paving blocks. According to an analysis of the compressive strength test results at 28 days, the addition of 2.5% bagasse ash of 23.64 MPa produced the highest compressive strength, and the addition of 7.5% bagasse ash with of 18.43 MPa produced the lowest compressive strength. The test specimens with the addition of 10% bagasse ash showed the highest water absorption in the 28-days of 6.57%; in contrast, the test specimens with the addition of 2.5% bagasse ash showed the lowest water absorption of 3.27%. Any variation of the mixture that has samples that are 28 days and have a water absorption value of up to 6% meets the requirements of SNI-03-0691-1996 paving block quality B.

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Evaluating sustainable efficiency: A study on transportation systems in South America using data envelopment analysis

Latin American Transport Studies

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Latin American Transport Studies 2024年 2卷

作者： Hélio da Silva Queiroz Júnior Marcos Araújo de Souza Celestino Viviane Adriano Falcão Francisco Gildemir Ferreira da Silva Maurício de Oliveira Andrade Anísio Brasileiro Department of Civil Engineering Civil Engineering Post-Graduation Program Federal University of Pernambuco Recife Pernambuco 50670-420 Brazil Economy Graduate Program (Caen/UFC) Federal University of Ceará - UFC Fortaleza Ceará 60020-181 Brazil Graduate Program in Transport (PPGT/UnB) University of Brasilia Brasília DF 70.919-970 Brazil

The transport sector is pivotal in fostering economic growth and environmental sustainability. Extensive research has scrutinized various transportation modes individually, yet a holistic assessment encompassing all modes while considering CO2 emissions needs to be more conspicuously present. Our study employs Data Envelopment Analysis (DEA) to evaluate the efficacy of transportation policies in South American nations in the context of United Nations-established sustainable development goals. Our overarching objective is to classify the sustainability status of South American countries' transport sectors and to establish benchmark models rooted in the six dimensions of sustainability. Methodologically, our analysis integrates operational transportation metrics, Gross Domestic Product per capita, Human Development Index, and CO2 emissions from transportation systems. Additionally, we draw comparative insights by juxtaposing South American countries against the G8 and BRICS nations. The rigorous application of DEA coupled with bootstrap validation fortifies the reliability of our findings. Our results bring to light these findings, positioning South American countries closer to their developed counterparts. Notably, the sustainable development models of Chile and Uruguay emerge as prominent exemplars. This study underscores the pressing demand for holistic and integrated development strategies to attain more sustainable outcomes across South American nations in a faster way. In conclusion, our research fills a conspicuous void in the extant literature by furnishing a comprehensive evaluation of transportation policy performance in South America. Based on a robust methodology, this empirical evidence offers valuable insights for policymakers striving to advance sustainable regional development.

关键词： Sustainable Efficiency South America Transportation Emissions CO2 Data Envelopment Analysis

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Combination of river stone and river sand in North Luwu district, Indonesia with marble ash as filler towards marshall characteristics

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AIP Conference Proceedings 2024年第1期3110卷

作者： Parea Rusan Rangan Miswar Tumpu Mansyur Mansyur Civil Engineering Department Faculty of Engineering Christian University of Indonesia Toraja Indonesia Disaster Management Study Program The Graduate School Hasanuddin University Makassar Indonesia Civil Engineering Department Faculty of Engineering SembilanBelas November University Kolaka Indonesia

The AC-BC (Asphalt Concrete-Binder Course) pavement layer is a middle layer that sits above the AC base and beneath the wear layer. To be used in this study were the river stone and river sand, Sabbang District, and North Luwu Regency in Mixed Laston AC-BC. With varying marble ash contents of 0, 25, 50, 75, and 100%, experiments were conducted on the characteristics of coarse and fine aggregate as well as marble ash as a filler substitute. The composition of the AC-BC mixture was then designed, the mix properties were determined by the Marshall test, and the Marshall stability residual mix at the optimal bitumen concentration was determined by the Marshall immersion test. The findings demonstrated that the pavement materials, located in Sabbang District, North Luwu Regency, meet the requirements for use as road pavement layer materials. The characteristics of the AC-BC combination with asphalt contents of 5.0, 5.5, 6.0, 6.5, and 7.0% were determined by the Marshall Test. The results of the Marshall Immersion test for the AC-BC mixture with an ideal bitumen content of 6.00% produced a residual Marshall stability of 96.5%, fulfilling the Indonesian requirement of 2018 Bina Marga Specifications, which is a minimum of 90%.

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The simulation of cropping pattern to improve the performance of irrigation network in Cau irrigation area

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Journal of Physics: Conference Series 2017年第1期795卷

作者： Retno Wahyuningsih RR Rintis Hadiani Sobriyah Civil Engineering Department of Post Graduate Program Sebelas Maret University Jl. Ir. Sutami 36A Kentingan Jebres Surakarta 57126 INDONESIA

Cau irrigation area located in Madiun district, East Java Province, irrigates 1.232 Ha of land which covers Cau primary channel irrigation network, Wungu Secondary channel irrigation network, and Grape secondary channel irrigation network. The problems in Cau irrigation area are limited availability of water especially during the dry season (planting season II and III) and non-compliance to cropping patterns. The evaluation of irrigation system performance of Cau irrigation area needs to be done in order to know how far the irrigation system performance is, especially based on planting productivity aspect. The improvement of irrigation network performance through cropping pattern optimization is based on the increase of water necessity fulfillment (k factor), the realization of planting area and rice productivity. The research method of irrigation system performance is by analyzing the secondary data based on the Regulation of Ministry of Public Work and State Minister for Public Housing Number: 12/PRT/M/2015. The analysis of water necessity fulfillment (k factor) uses Public Work Plan Criteria Method. The performance level of planting productivity aspect in existing condition is 87.10%, alternative 1 is 93.90% dan alternative 2 is 96.90%. It means that the performance of the irrigation network from productivity aspect increases 6.80% for alternative 1 and 9.80% for alternative 2.

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study of the effect of soluble silicates (waterglass) and limestone on the compressive strength test, cohesion and modulus of soil stiffness

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AIP Conference Proceedings 2024年第1期3110卷

In order to sustain the construction of a building, soil stability is crucial. In this study, clay soil had waterglass and limestone added to it. Given the current state of the soil, the researchers attempted to improve it by adding an activator, specifically limestone and waterglass, as an addition. This study will keep track of the soil’s compressive strength after it has been activated with waterglass and limestone. The waterglass variation is 7% of the overall weight, while the variations for the limestone mix are 5%, 10%, and 15%. According to the test results, the soil has a compressive strength of 0.86 kg/cm2, making it unsuitable for use as subgrade soil. The test findings showed that after adding waterglass activator and limestone, the compressive strength value of the free rose. As can be observed, adding 5%, 10%, 15% limestone and 7% waterglass and curing the mixture for a day resulted in unconfined compressive strength values of 4.82 kg/cm2, 6.76 kg/cm2, and 7.48 kg/cm2, respectively. The compressive strength measurements after 3 days of curing were 7.13 kg/cm2, 7.55 kg/cm2, and 11.24 kg/cm2, respectively. These findings suggest that adding waterglass activators and limestone can strengthen soil.

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