Other affiliations: Japan Society for the Promotion of Science
Bio: Yuki Terazawa is an academic researcher from Tokyo Institute of Technology. The author has contributed to research in topics: Structural engineering & Damper. The author has an hindex of 4, co-authored 17 publications receiving 31 citations. Previous affiliations of Yuki Terazawa include Japan Society for the Promotion of Science.
TL;DR: In this paper, a multistage buckling-restrained brace with two low yield point (LYP) cores with LY225 and short yield lengths and one high yield point core with SA440B and a longer yield length was proposed.
TL;DR: The analysis results suggest that taking the composite behavior into account by using the proposed retrofit design method more accurately estimates the lateral stiffness of the retrofitted structure and leads to a more economic retrofit.
01 Oct 2019
TL;DR: A computational seismic design routine is proposed based on a generalized response spectrum analysis for highly indeterminate structures with energy-dissipation members, such as viscous or elasto-plastic dampers, to rapidly identify novel and efficient damper arrangements and sizing distributions, avoiding computationally intensive nonlinear response history analysis.
Abstract: In this study, a computational seismic design routine is proposed based on a generalized response spectrum analysis for highly indeterminate structures with energy-dissipation members, such as visc...
01 Jan 1971
TL;DR: In this article, the authors deal with the dynamic ASPECTS of the sub-subject: MATHEMATICAL ANALYSIS of systems SUBJECTED to INDEPENDENT VIBRATIONS by means of MATHEATICAL MODELS.
Abstract: PART 1 DEALS WITH THE DYNAMIC ASPECTS OF THE SUBJECT: MATHEMATICAL ANALYSIS OF SYSTEMS SUBJECTED TO INDEPENDENT VIBRATIONS BY MEANS OF MATHEMATICAL MODELS. THE ANALYTICAL SYSTEMS USED ARE NON-LINEAR SYSTEMS, HYDRODYNAMICS AND NUMERICAL METHODS. PART 2 EXAMINES SEISMIC MOVEMENTS, THE DYNAMIC BEHAVIOUR OF STRUCTURES AND THE BASIC CONCEPTS OF THE SEISMIC DESIGN OF STRUCTURES.
TL;DR: In this article, the effect of the core plate geometric construction on the strength and stiffness of a BRB was first quantified, and a total of 27 seven-story inverted V-type BRB-reinforced concrete frames (BRB-RCFs) with three story shear ratios p and nine corresponding stiffness ratios k were designed.
01 Oct 2019
TL;DR: In this paper , an input velocity adjustment method of the critical double impulse (DI) is presented for efficient design of viscous dampers for elastic-plastic moment frames, where the input energy to the lowest eigenmode under the critical DI is equal to those under the selected recorded ground motions.
Abstract: An input velocity adjustment method of the critical double impulse (DI) is presented for efficient design of viscous dampers for elastic-plastic moment frames. The input velocity is adjusted so that the input energy to the lowest eigenmode under the critical DI is equal to those under the selected recorded ground motions. This adjustment makes the critical DI work as the active earthquake. The response bounding property of the critical DI is supported by, (1) the multi-modal property of the critical DI, (2) the usual excitation of the lowest mode response under recorded ground motions, (3) the large proportion of the instantaneous input energy to the total input energy in the critical DI. The proposed method can treat not only pulse-like near-fault ground motions but also ground motions of random nature. To validate the proposed method, the input energies and the maximum interstory drifts under the recorded ground motions and the critical DI with the adjusted input velocity are investigated for elastic single-degree-of-freedom (SDOF) models, elastic proportionally damped MDOF models, and elastic-plastic proportionally damped MDOF models. The optimization method presented in the previous paper is extended so that the critical DI can be treated for the design of viscous dampers for elastic-plastic moment frames.
TL;DR: Investigation of the use of friction dampers as displacement-dependent energy dissipation devices to retrofit RC moment frame structures suggests that the proposed retrofit design method and friction brace dampers are effective in reducing the maximum story drift.