Seismic retrofit of buildings with backbone dampers

2017-01-01
Shaban, Nefize
Ozdemir, Seda
Caner, Alp
Akyüz, Uğurhan
Dampers have been effectively used in new designs and seismic retrofit of old structures in many parts of the world. The common seismic retrofit practice in Turkey is almost purely based on stiffening the structure with additional shear walls or adding braces to limit the excessive seismic drifts. Such an approach usually results in expensive interior works and enlargements of foundations. The stiffening of the structure typically results in attracting more seismic force. Utilization of dampers as seismic protection devices have not been so much popular in Turkey and have been considered to be used only in some few retrofits. However, use of seismic protection devices can significantly improve the structural response and reuse of the structure after the earthquake. A new type of damper system called backbone damper has been recently developed and tested at the laboratories of METU. The results of more than 1000 tests indicated that the response of backbone damper is stable under the same conditions and more than 20% damping can be achieved at story drifts of 10-20 mm of movements. The harmonic motion test speeds reached up to 400 mm/sec in some cases and a maximum frequency of 7 Hz is achieved during some tests. It shall be noted that the backbone damper has an internal displacement amplifier that helps the system to damp even at small movements. The dampers do not get damage at the end of tests and has the ability to re-center themselves. The solid model of the damper has been prepared using the ABAQUS software. The focus of the paper will be given to application of this new damper system to improve the seismic response of the existing structures. In this scope, one typical hospital building with different selection of damper performance has been investigated in the case study. Three ground motions have been applied to the structures with and without dampers. The ground motion records are scaled to have a equivalent design response spectrum curve. The results of non-linear time history analysis performed in LARSA 4D have indicated that the seismic response of the structures can be improved significantly in terms of displacments.
6th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering

Suggestions

Seismic behavior of reinforced autoclaved aerated concrete wall panels
TAGHIPOUR, ARMIN; Canbay, Erdem; Binici, Barış; ALDEMİR, ALPER; Uzgan, Ugur; ERYURTLU, ZAFER (2018-09-01)
Vertical reinforced autoclaved aerated concrete (AAC) panel systems are among attractive alternatives for low‐rise buildings. The popularity of AAC panels in building construction is increasing due to their unique material properties, such as being light weight, good insulator, fire resistant combined with having high speed of erection and ease of quality control. However, past experimental evidence on the seismic response of reinforced vertical panels is rather limited with few tests on multi‐panel specime...
Seismic behavior of autoclaved aerated concrete low rise buildings with reinforced wall panels
Gökmen, Furkan; Binici, Barış; Canbay, Erdem (Springer Science and Business Media LLC, 2019-07-01)
Reinforced Autoclaved Aerated Concrete (AAC) wall panels are more commonly used to construct load-bearing walls in low-rise prefabricated buildings located in seismic zones. In the scope of this study, the seismic response of buildings constructed with reinforced AAC wall panels was investigated. To this end, an in situ test was conducted on a two-story test building under reversed cyclic displacement excursions. It was determined that the test building could carry a lateral load of 60% more than its weight...
Seismic Strengthening with Precast Concrete Panels - Theoretical Approach
Baran, Mehmet; Canbay, Erdem; Tankut, Tugrul (2010-01-01)
An economical, structurally effective and practically applicable seismic retrofitting technique has been developed on the basis of the principle of strengthening the existing hollow brick infill walls by using high strength precast concrete panels. The technique would not require evacuation of the building and would be applicable without causing much disturbance to the occupant. For this purpose, a total of eighteen reinforced concrete frames with hollow brick infill walls were tested under reversed cyclic ...
Seismic strengthening of reinforced concrete frames by precast concrete panels
BARAN, MEHMET; Susoy, M.; Okuyucu, D.; Tankut, T. (Thomas Telford Ltd., 2011-05-01)
An innovative occupant-friendly retrofitting technique has been developed for reinforced concrete (RC)-framed structures which constitute the major portion of the existing building stock. The idea is to convert the existing hollow brick infill wall into a load-carrying system acting as a cast-in-place concrete shear wall by reinforcing it with relatively thin high-strength precast concrete panels epoxy bonded to the plastered infill wall and epoxy connected to the frame members. In this study, results of 11...
Seismic upgrading of reinforced concrete frames with structural steel elements
Özçelik, Ramazan; Binici, Barış; Department of Civil Engineering (2011)
This thesis examines the seismic internal retrofitting of existing deficient reinforced concrete (RC) structures by using structural steel members. Both experimental and numerical studies were performed. The strengthening methods utilized with the scope of this work are chevron braces, internal steel frames (ISFs), X-braces and column with shear plate. For this purpose, thirteen strengthened and two as built reference one bay one story portal frame specimens having 1/3 scales were tested under constant grav...
Citation Formats
N. Shaban, S. Ozdemir, A. Caner, and U. Akyüz, “Seismic retrofit of buildings with backbone dampers,” Rhodes Island, Greece, 2017, vol. 1, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/56265.