Journal of Civil Engineering Beyond Limits (CEBEL)

Mahyar Maali Mahmut Kılıç Barış Bayrak Elif Mete Kübra Çebi Abdulkadir Cüneyt AYDIN

Plastic waste is one of the most important problems that have occurred with modernization in the world and in our country. The use of plastics, which makes our daily life easier at many points, is also increasing day by day. The recycling and re-usability of these waste materials after use are of great importance and meaning when evaluated in terms of ecological order. In this study, finely ground waste polypropylene, which became waste, were poured into cold formed I100 and U100 steel profile molds. Carbon and glass fibers were used as reinforcement within the 16 samples. After melting, the behavior of I100and U100 molds filled with polypropylene will be observed after bending and shear tests on the samples. In the study, eight specimens for I100 and eight specimens for U100 profiles were produced. The main purpose of the cold formed steel in the production of I100 and U100 models is to enhance the bending and shear behavior of the models. As a result, the melted polypropylene within the cold formed I and U type models are presented a stunning performance.

https://doi.org/10.36937/cebel.2020.002.001

Mahmut Kılıç Mahyar Maali Barış Bayrak Kübra Çebi Elif Mete Abdulkadir Cüneyt AYDIN

Torsional behaviors of col- formed steel beams are investigated for the webs which are filled by polypropylene. Four I and U profile beams filled with polypropylene were manufactured and tested. In the study, two specimens U100 and two specimens I100 profiles with 1.5 m length and 1.20 mm thickness and thin-walled cold-formed steel profiles were used. The aim of this study is to investigate the torsional behavior of the composite material formed by pouring the polymer material into the U and I profile molds after homogenous pulping. A total of two groups of samples will be obtained: empty cold-formed steel profiles and waste polymer. In this study, finely ground waste and/or raw PP (polypropylene) was used as filling material. The polypropylene is not only improved the torsional behavior strikingly; but also give a way on environmental profit for waste recycling.

https://doi.org/10.36937/cebel.2020.002.002

Orhan Doğan

Double skin composite (DSC) construction consists of a layer of a plain concrete, sandwiched between two layers of relatively thin steel plate, connected to the concrete by welded stud shear connectors. This construction acts in a similar way to doubly reinforced concrete elements but the flexibility of connection between the steel plates and concrete gives rise to interface slip and additional overall element deflection. This results in a strong and efficient structure with certain potential advantages over conventional forms of construction. This paper presents a theoretical analysis of the behavior of simply supported single span DSC beams, assuming both full and partial interaction. The partial interaction analysis takes into account the flexibility of connection on both tension and compression faces. The partial interaction analysis is extended to cover the influence of frictional forces between the concrete and external steel plates, at the supports and load points. The theoretical solutions based on partial interaction theory, assuming realistic material and shear connector properties and incorporating the influence of interface frictional forces between the concrete and external steel plates, at the supports and load points, are compared with the results of tests on DSC beams. It is concluded that the proposed method shows good correlation with real behavior and may be reliably used for the analysis of simply supported single span DSC beams.

https://doi.org/10.36937/cebel.2020.002.003

Esra Mete Güneyisi Serkan Etli

In this study, the seismic behavior of steel framed buildings under the effect of near-field with pulse (NF-P), near-field without pulse (NF-NP), and far-field (FF) ground motions was evaluated in a comparative manner. For this, 8 and 12 story steel moment-resisting frames (SMRFs) having four equal bays and identical story height were taken into account and then subjected to a series of NF-P, NF-NP and FF earthquake motions based on the nonlinear dynamic analysis. Each earthquake series included 10 different acceleration records. They were scaled to match the target design spectrum. Numerical modeling and analysis of the SMRFs were performed through Seismostruct software. The response quantities utilized in the comparisons of the case study SMRFs were the inter-story drift ratio, roof drift ratio, base shear coefficients, and time history of displacement in different story level. These responses were examined comparatively.

https://doi.org/10.36937/cebel.2020.002.004

Arslan Shamim Sajjad Ahmad Anwar Khitab

Human population is growing around the world day by day, necessitating highly sustainable and energy efficient building systems. In conventional building systems, significant amount of energy is consumed for providing thermal comfort to the occupants. Materials used for thermal insulation not only increase the cost of the buildings but also increase the dead weight of building. Structural concrete insulated panel system (SCIP) provide thermally efficient, light weight, and low cost solution as compared to the conventional systems. SCIP system is new innovation, in which, insulation material is placed between two layers of concrete. Due to lowlight weight, it can be easily handled and transported toat project sites. In present research, the performance of SCIP walls in a typical school double story building is examined by three dimensional finite element analysis, using SAP2000. The response iswas evaluated by varying the thickness of the insulation layer in terms of safety and serviceability. The results show that the buildings incorporating SCIPs are capable to withstand high dynamic and earthquake loads and are significantly economical as compared to the conventional building systems.

https://doi.org/10.36937/cebel.2020.002.005