Abstract:

In Turkey, the construction sector has met with concrete prefabrication from the late 1960s. Prefabricated structures are preferred especially in industrial structures due to their rapid production and assembly. The biggest disadvantage of this type of structure is the damage that occurs especially in the maffial joint areas. In the areas where the roof cracks and the love cracks are combined, the connection is usually made as a mafsal. Therefore, theoretically, the moment is not formed in the mesnet areas, and the cuts of this type of curves are calculated as in simple mesnet curves. However, the cutting force concentrated in the affected finite areas has caused the increase in cutting tensions, a set of special design rules for the detailing of this area has been included in the relevant standards. In these compound areas, damage is observed as a result of intense snow accumulated on the roof after effective and long-term snowfall. These damages pose a significant risk for the refined end-lover cracks, including those in the relatively older prefabricate building stock. In this study, the behavior under the influence of the narrow burden of the delighted end lovers, which have not yet been thoroughly studied, has been experimentally and numerically studied according to the changing mechanical parameters of the lovers. First, the experiments were conducted of two lovers who were in accordance with the applicable standards and were not in accordance. Then again, a standard-sufficient piece of love is tested by strengthening with CFRP in order to prevent degraded end damage. It was subsequently confirmed by experimental studies with the results obtained from lovers modeled with the ABAQUS program. With all the experimental results, the results of numeric modeling were quite close. The similarity of the damage observed in the digital model samples to the damage caused in the experiments has shown that numeric models can be used in new parametric studies. After the verification, a series of parametric work related to the mechanical characteristics of lovers and strengthening alternatives was performed numerically. In the parametric study, it has been assessed as a parameter, especially in existing lovers, with the view that concrete pressure resistance, equipment drawing resistance and the level of sprinkling used in the production of lovers can be different from the design. Also, the behavior of lovers reinforced by carbon fiber-added polymer (CFRP) fabric and not designed according to the regulations has also been studied again in the parametric work section. According to the results of the parametric study, the pressure resistance of concrete is more effective, while the increase in the resistance of concrete and steel has been shown to significantly increase the cutting capacity. In the results obtained, the increase in the predictive value has not been shown to have a significant impact on capacity. In the samples enhanced by the CFRP, the carrier’s capacity has increased to 50%, and the damage is shifted out of the decayed end area (in the unincorporated area). The best enhancement alternative was suggested by modeling different and applicable CFRP alternatives with parametric study. However, some recommendations have been presented on the design of the equipment of the finite lovers.

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