Özet:

Anchored/secondary beams are beams that are not supported at their ends by column, shear wall or beams. In case the beams are not supported by columns, beam loads are transferred to other beams, in other words by forming secondary beams, loads are transferred to vertical load-bearing elements indirectly. This situation, together with the shear and moment increase in the frame beam carrying the secondary beams, may cause additional torsion moments, as well as damage to the these beams due to additional horizontal and vertical earthquake loads. In this study, the changes in the cross-sectional effects of reinforced concrete frames and secondary beams for different earthquake zones within the scope of Requirements for Design and Construction of Reinforced Concrete Structures (TS-500), Regulations on Buildings to be Built in Earthquake Zones (DBYBHY-2007) and Turkish Building Earthquake Code (TBDY-2018) analyzed comparatively. For this purpose, a five-storey reinforced concrete building with a symmetrical plan consisting of a frame system in accordance with the rules of TS-500, DBYBHY-2007 and TBDY-2018 was modeled and for 5 different earthquake zones of Turkey (Sakarya-Akyazı, Istanbul-Silivri, Çankırı-Kızılırmak, Ankara-Yenimahalle Karaman-Merkez) based on the determined peak ground accelerations (PGA) and analyzes were made in the SAP2000 computer program with the equivalent earthquake load method according to the DBYBHY-2007 and TBDY-2018 earthquake codes. With the TBDY-2018 code, besides the additional vertical earthquake effect, when both the increase in natural vibration periods and the increase in the total equivalent lateral earthquake effects (base shear force) of a building having been taken into account, the frame and secondary beam support moments have increased approximately 4 times. It has been observed that the ratio of vertical earthquake effect in this increase in support moments is approximately 20% for cantilever beams.

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