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Cost and CO2 optimization for RC short column sections subjected to axial load and uniaxial/biaxial bending using the social spider optimization algorithm

Akin A. | Aydogdu I. | Bilir T.

Conference Object | 2016 | Sustainable Construction Materials and Technologies2016-August

The building construction industry consumes large amounts of energy and creates substantial pollution by producing a large portion of CO2 emissions. In addition to the energy consumed from the operation of the building, the energy consumed from both materials in the construction phase must be reduced to minimize the life-cycle energy use of a building. In this study, an optimal design method for RC columns in buildings using Social-Spider Optimization (SSO) algorithm is proposed to reduce the cost and CO2 emissions from the structural materials in the construction phase. Objective functions of the optimization problem are defined as . . . the minimized cost, the CO2 emission, and the weighted aggregate of the cost and CO2. In the formulation of the objective functions, unit costs are based on the materials and labor required for the construction of RC columns and CO2 emissions are associated with the transportation, processing, manufacturing, and fabrication of materials and the emissions of the equipment involved in the construction process. In the formulation of the optimum design problem, the sectional properties of RC columns with rectangular cross section that are subjected to axial force and bi-axial bending moment such as the dimensions of the rectangular cross section along x and y direction, the diameters of bars and their total number along x and y directions are taken as design variables. The design constraints are implemented from ACI 318-14 which consist of columns strength check under axial compression and biaxial bending, the minimum and maximum steel ratio, the minimum and maximum bar spacing and the minimum column width restrictions. The proposed SSO based optimal design method is applied to two numerical design examples to investigate the effective use of structural materials for the sustainable design of RC columns and to demonstrate the efficiency and robustness of the presented algorithm. © 2016 International Committee of the SCMT conferences. All rights reserved Daha fazlası Daha az

Modeling of elastic modulus of concrete containing fly Ash by gene expression programming

Sarıdemir M. | Bilir T.

Conference Object | 2016 | Sustainable Construction Materials and Technologies2016-August

The gene expression programming that is one of the artificial intelligence techniques, have been commonly used to model some of civil engineering applications. In this study, two models in the gene expression programming for predicting the elastic modulus of concrete containing fly Ash have been developed. First model is proposed for the elastic modulus prediction from compressive strength of concrete containing fly Ash, and second model is proposed for the elastic modulus prediction from amount of fly Ash and compressive strength of concrete containing fly ash. For the aim of building these models, the experimental results for 259 . . .specimens presented with 132 different concrete mixtures were collected from the literature. The training and testing sets of these models are divided without prior planning from the experimental results. These models are also validated with 122 data of experimental results other than the data used in training and testing sets. Moreover, the results obtained from these models are compared with the experimental results and formulas results given by some national building codes. These comparisons revealed that the equations of these models appeared to well concur with the experimental results and found to be very reliable. © 2016 International Committee of the SCMT conferences. All rights reserved Daha fazlası Daha az

Restoration approach to improve sustainability and longevity in existing historical structures

Sayin B. | Akcay C. | Yildizlar B. | Bilir T. | Bozkurt T.S.

Conference Object | 2016 | Sustainable Construction Materials and Technologies2016-August

An aspect of the sustainable structure is the retrofitting of structural members in buildings and this yield to less use of natural resources and increase the strength of such materials for the same or similar purpose, thereby reducing waste as well. Sustainable structure also enhances the recycling of the industry as such materials are readily available in the world market. Structural materials are examples of sustainable materials and its combinations, however, the life time of structures and materials are decreased by environmental conditions, especially. Accordingly, repairing and strengthening of historical structures are an im . . .portant factor in terms of transfer new generations and maintain preserving of such structures. This study focuses on restoration studies included repairing and strengthening, therefore, it is aimed to extend the buildings’ service life and preserve its original structure and materials. In the present study, historical buildings, registered as protection required of cultural asset by the Protection of Cultural Assets District Board, is investigated. It is examined that retrofitting techniques in the buildings are performed repairing and strengthening applications by steel profile, jacketing, lime mortar, CFRP, steel mesh and injection according to material analysis on historical structural members. © 2016 International Committee of the SCMT conferences. All rights reserved Daha fazlası Daha az

Earthquake behavior of reinforced concrete frames subjected to rebar corrosion

Yüksel İ. | Coşkan S.

Conference Object | 2013 | Sustainable Construction Materials and Technologies2013-August

The aim of this paper is to investigate the earthquake behaviour of reinforced concrete frames subjected to rebar corrosion. A typical two-bay, four-story reinforced concrete (RC) frame is designed. Two different rebar corrosion scenarios and a design spectrum are selected. The deteriorated condition in these scenarios are included which are loss in diameter of rebar, changes of mechanical properties of reinforcement steel bars, bond strength and changes in damage limits of concrete sections. The RC frame is evaluated using a nonlinear static analysis method in sound condition as well as deteriorated conditions. The rebar corrosion . . .effect on the global level is investigated by comparing the responses of each scenario with respect to the response of sound condition of the frame. The result shows that the progressive deterioration of frames over time can cause serious reductions on the load-bearing capacity. Hence the overall seismic behaviour of the frame is adversely affected. © 2013 Sustainable Construction Materials and Technologies. All rights reserved Daha fazlası Daha az

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