Turkish Journal of Civil Engineering最新文献_第5页

Ability, Motivation, Opportunity-oriented HR Practices, Organisational Citizenship Behaviour and Performance Outcomes Relationship in Project-based Construction Organisations 能力，动机，机会导向的人力资源实践，组织公民行为和绩效结果关系在项目为基础的建设组织

Turkish Journal of Civil Engineering Pub Date : 2023-01-01 DOI: 10.18400/tjce.1209164

Bilge Akbiyikli, Ş. Eyüpoğlu, R. Akbiyikli

引用次数: 0

An Experimental and Numerical Investigation on the Bending Behavior of Fiber Reinforced Concrete Beams 纤维混凝土梁弯曲性能的试验与数值研究

Turkish Journal of Civil Engineering Pub Date : 2023-01-01 DOI: 10.18400/tjce.1209152

M. A. Çankaya, Çetin Akan

{"title":"An Experimental and Numerical Investigation on the Bending Behavior of Fiber Reinforced Concrete Beams","authors":"M. A. Çankaya, Çetin Akan","doi":"10.18400/tjce.1209152","DOIUrl":"https://doi.org/10.18400/tjce.1209152","url":null,"abstract":"The effects of hooked end steel and polypropylene (PP) fibers on the behavior of large-scale doubly reinforced concrete beams under flexure were investigated using experimental and numeric methods. For this purpose, a total of eight beam specimens consisting in two groups were produced in the laboratory and three-point bending tests were conducted under monotonically increasing load. The beams in the groups were designed to have 0.86 and 1.30% tensile reinforcement ratios leading to either flexural or shear critical sections. Three out of eight were produced to be control samples and did not have any fiber additive while remaining five had 0, 0.5 and 1.0% steel or PP fibers by volume. Experimental results showed that the existence of 0.5% either type of fiber in densely reinforced specimens contributed to shear strength and allowed flexural capacities to be fully used instead of an improvement in the capacity. However, when the steel fiber ratio increased to 1.0% flexural capacity was enhanced by 10% for both type of beams. After the experimental study, the beams numerically modeled using nonlinear finite element method and flexural stiffness before yielding as well as yield strength with load carrying capacities were found to be consistent with that of experiments specifically for the beams having stirrup and steel fibers.","PeriodicalId":241324,"journal":{"name":"Turkish Journal of Civil Engineering","volume":"298 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124263361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solution Proposals based on Fuzzy AHP-TOPSIS Hybrid Model to the Problems in Public Works Procurement in Turkey 基于模糊AHP-TOPSIS混合模型的土耳其公共工程采购问题解决方案

Turkish Journal of Civil Engineering Pub Date : 2023-01-01 DOI: 10.18400/tjce.1209197

İbrahim Özyürek, Mürsel Erdal

引用次数: 0

Severity Assessment of Problems in Turkish Building Audit System: A Fuzzy AHP Approach 土耳其建筑审计系统问题严重程度评价:模糊层次分析法

Turkish Journal of Civil Engineering Pub Date : 2023-01-01 DOI: 10.18400/tjce.1209174

Murat Cevikbas, Ozan Okudan, Z. Işık

{"title":"Severity Assessment of Problems in Turkish Building Audit System: A Fuzzy AHP Approach","authors":"Murat Cevikbas, Ozan Okudan, Z. Işık","doi":"10.18400/tjce.1209174","DOIUrl":"https://doi.org/10.18400/tjce.1209174","url":null,"abstract":"The Building Audit system (BAS) has often been criticized due to its various drawbacks by researchers, construction practitioners, and professional chambers. Existing studies, however, do not comprehensively investigate the problems seen in Turkish BAS. Since the decision-makers are provided with little knowledge about the drawbacks of the system, they can barely develop new strategies to improve its effectiveness and efficiency. To bridge this gap, this study aimed to identify the drawbacks seen in the implementation of the Turkish Building Audit System (BAS). In addition, the severity of each drawback was also determined to further provide comprehensive guidance to policymakers and non-governmental organizations (NGOs). Initially, an extensive literature review was conducted to identify problems of Turkish BAS. Identified problems were then validated through Focus Group Discussion (FGD) sessions with the participation of 12 experts who have diverse experience in the related field. Later, a questionnaire survey was designed to measure the severity of each problem/drawback and the data was collected from 15 construction practitioners. The data were then analyzed using the Fuzzy Analytical Hierarchy Process (FAHP) method to measure the severities of problems seen in Turkish BAS. Then, the problems were prioritized based on their severities. At the final step, sensitivity analysis was conducted to measure the robustness and reliability of the results derived from the FAHP method. Results revealed that problems such as “Lack of practical knowledge of technical staff”, “Absence of site supervisor at the site” “Political pressure” and “Neglecting technical specifications and procedures” were determined as the most severe problems that need urgent attention of decision-makers. It is highly believed that this study will guide decision-makers for the improvement of existing legislation. Additionally, it is also believed that practitioners will take necessary precautions beforehand by using the outputs of this study.","PeriodicalId":241324,"journal":{"name":"Turkish Journal of Civil Engineering","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124730831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Stress Analysis of Laminated HSDT Beams Considering Bending Extension Coupling 考虑弯伸耦合的叠合HSDT梁应力分析

Turkish Journal of Civil Engineering Pub Date : 2023-01-01 DOI: 10.18400/tjce.1206777

Yonca Bab, A. Kutlu

引用次数: 0

An Integrated Simulation-Optimization Approach for Dynamic Design of the Urban Wastewater Collection Systems 城市污水收集系统动态设计的综合仿真-优化方法

Turkish Journal of Civil Engineering Pub Date : 2023-01-01 DOI: 10.18400/tjce.1209180

A. Gholami, Pinar G. Durgut, M. T. Ayvaz

{"title":"An Integrated Simulation-Optimization Approach for Dynamic Design of the Urban Wastewater Collection Systems","authors":"A. Gholami, Pinar G. Durgut, M. T. Ayvaz","doi":"10.18400/tjce.1209180","DOIUrl":"https://doi.org/10.18400/tjce.1209180","url":null,"abstract":"In this study, a simulation-optimization approach is proposed for dynamic design of the urban wastewater collection systems. The proposed approach consists of the mutual integration of the Storm Water Management Model (SWMM), developed by the U.S. Environmental Protection Agency (US-EPA) and the heuristic Harmony Search (HS) optimization approach. Unlike the previous approaches developed to solve wastewater collection system design problems, the proposed approach simulates the hydraulic flow process by considering unsteady state flow conditions based on the dynamic wave model. The objective of the HS-based optimization model is to determine the pipe slopes so that the total system cost is minimized. After determining the pipe slopes, the corresponding pipe diameters were determined by developing an internal solution approach. All the physical and managerial constraints that should be considered during the search process have been considered by means of the penalty function approach. The applicability of the proposed approach was evaluated by solving two example problems. Identified results indicated that the proposed approach can effectively solve the dynamic design problems of the wastewater collection systems.","PeriodicalId":241324,"journal":{"name":"Turkish Journal of Civil Engineering","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132285243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Investigation of the Addition of Sodium Lignosulfonate to Lime Column Used For Improving the Expansive Soils 添加木质素磺酸钠改良膨胀土石灰柱的研究

Turkish Journal of Civil Engineering Pub Date : 2023-01-01 DOI: 10.18400/tjce.1209185

İlyas Özkan, E. Çokça

{"title":"The Investigation of the Addition of Sodium Lignosulfonate to Lime Column Used For Improving the Expansive Soils","authors":"İlyas Özkan, E. Çokça","doi":"10.18400/tjce.1209185","DOIUrl":"https://doi.org/10.18400/tjce.1209185","url":null,"abstract":"The lime column (LC) technique has been commonly used for the improvement of expansive soils. The achievement of this technique depends on the lime diffusion into the expansive soils, but lime diffusion into the expansive soil is generally a slow process due to the low permeability of these soils. In this study, sodium lignosulfonate, which is used as a superplasticizer in the concrete industry, was added to lime columns to accelerate the diffusion of lime particles. First, treated expansive clay specimens with thirty-seven 4.5 mm diameter columns were prepared in an oedometer ring. These columns were filled with two different mixtures: water-lime and water-lime-sodium lignosulphonate to investigate the effect of the addition of sodium lignosulphonate. Free swell tests were done on these treated expansive clay specimens that were subjected to different curing periods, it was observed that the treated specimens with sodium lignosulphonate lime columns (NaLS-LC) are more effective than the treated specimens with lime columns (LC). A treated expansive clay specimen (in a 30cmx30cm mold) with seven pieces of 45 mm diameter sodium lignosulphonate lime columns were prepared to observe the alteration of engineering properties of untreated expansive clay specimen (US) located between the columns. Free swell and unconfined compressive strength tests were done on the undisturbed expansive clay specimens taken from the mold between the columns. SEM-EDX analyses were made to investigate whether the ettringite mineral, which leads to swelling of the expansive soil during lime stabilization, forms or not. While the ettringite mineral formed during the curing period in the lime column stabilization method, the addition of sodium lignosulphonate to lime columns blocked the formation of the ettringite mineral. It can be stated that sodium lignosulphonate lime columns (NaLS-LC) show better performance than lime columns (LC), in the treatment of expansive clays.","PeriodicalId":241324,"journal":{"name":"Turkish Journal of Civil Engineering","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133438978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1