ABSTRACT
Consider a frame with 1 × 2 spans such as previous researches (Nakamura et al., 2006, 2007), according to its symmetry, a simplified model used to analyze in this study consists of two bays with a span (see Fig. 1). The structure has a linear-elastic bay restoring force and story drift relationship as well as the slab. A constant k1 means a ratio of stiffness of bay 1 K1 to a sum
1 INTRODUCTION
1.1 Objectives
In common, a slab for in-plane shear due to seismicity might be designed against a difference of adjoining bays’ displacements and the slab stiffness for in-plane shear. That is to say, a shear deformation of the slab in calculation must be resisted by laterally installed brace members instead. No influence of mass distributed on the slab might be considered. Such calculations suppose that mass distribution on the slab might not cause the additional shear response. The behavior and the formulation of dynamic shear response in-plane problems to the lateral ground shaking for the lumped mass system were previously discussed and reported (Nakamura et al., 2006, 2007). However the investigation of seismic behavior for distributed mass system had hardly been conducted. Therefore objectives of this study are: 1) to obtain fundamental information about local shear response for the distributed mass system of linearelastic structure, 2) to propose a useful fundamental formula for predicting the maximum local shear response in serviceability limit state design.
