000018382 001__ 18382
000018382 005__ 20170118182219.0
000018382 04107 $$aeng
000018382 046__ $$k2017-01-09
000018382 100__ $$aTakamatsu, Keisuke
000018382 24500 $$aResearch on Seismic Retrofit Using Additional Outside Frame With Built-In Dynamic Mass and Dampers

000018382 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018382 260__ $$b
000018382 506__ $$arestricted
000018382 520__ $$2eng$$aThis study proposes a new seismic retrofit system which uses soft spring devices connecting the main structure and a subsystem using response control devices. The subsystem is composed of additional outside frames which are attached on the outside of the main structure to control seismic response. The seismic retrofit methods by response control devices can be classified into two major methods. One is the method of using the response control frames on the outside of existing building. The other is the method of attaching them in frames of existing building. This study draws attention to the former method. In this study, there are two common approaches to connect the main structure and subsystem:(1)using high rigidity members so that they respond as an integrated structure; and (2) using the coupling damping method which is connected with the response control devices between the main structure and subsystem without them. In the former case, it is often difficult to attach the rigid members to the main structure (e.g., concreate) because of significant material degradation. In the latter case, a large mass is required for the subsystem because the performance of main structure is determined by the mass of the subsystem. This study addresses the use of the dynamic mass (D.M.) for the outside frame to improve the seismic retrofit system to avoid the above problems. In this new system soft springs are used for the connection devices rather than rigid members. It is also possible to increase the mass of the subsystem by using the damping frame as the D.M. Such improvements have been achieved by the use of the D.M. to control the mass term in the equation of motion. This paper derives a theoretical formula for this system. Based on “invariant point theory,” optimal tuning and optimum damping formulas are derived. In addition, by expressing these formulas as function of natural periods, a multi-degree of freedom system can be applied with eigen-value analysis. The effectiveness of the proposed approach is illustrated with a practical design method and an example of its application.

000018382 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018382 653__ $$aseismic retrofit using additional outside frame, response control, dynamic mass

000018382 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018382 720__ $$aTakamatsu, Keisuke$$iHondo, Yosuke$$iHata, Ippei$$iKuroda, Ryuji
000018382 8560_ $$ffischerc@itam.cas.cz
000018382 8564_ $$s1444453$$uhttps://invenio.itam.cas.cz/record/18382/files/1345.pdf$$yOriginal version of the author's contribution as presented on USB, paper 1345.
000018382 962__ $$r16048
000018382 980__ $$aPAPER