수정된 등가골조법을 이용한 플랫플레이트 시스템의 설계

Abstract

Dept of Architectural Engineering, Hanyang University, Seoul 133-791, KoreaABSTRACT In general, flat plate systems have been used as a gravity load resisting system (GLRS) in building. Thus, this sys-tem should be constructed with lateral force resisting system (LFRS) such as shear walls and brace frames. GLRS should retainthe ability to undergo the lateral drift associated with the LFRS without loss of gravity load carrying capacity. And flat plate systemcan be designed LFRS as ordinary moment frame with the special details. Thus, flat plate system designed as GLRS or LFRSshould be considered internal forces (e.g., unbalanced moments) and lateral deformation generated in vicinity of slab joints renderthe system more susceptible to punching shear. ACI 318 (2005) allows the direct design method, equivalent frame method undergravity loads and allows the finite-element models, effective beam width models, and equivalent frame models under lateral loads.These analysis methods can produce widely different result, and each has advantage and disadvantages. Thus, it is sometimes dif-ficult for a designer to select an appropriate analysis method and interpret the results for design purposes. This study is to helpdesigner selecting analysis method for flat plate system and to verify practicality of the modified equivalent frame method underlateral loads. This study compared internal force and drift obtained from frame methods with those obtained from finite elementmethod under gravity and lateral loads. For this purposes, 7 story building is considered. Also, the accuracy of these models is ver-ified by comparing analysis results using frame methods with published experimental results of NRC slab. Keywords : flat plate, equivalent frame method, structural analysis, lateral load, gravity load