| PaperNO | Paper / Abstract |
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G0-001
16:10
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16:30
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M6.4, M7.0, M6.9 LOMBOK ISLAND EARTHQUAKES, NUSA TENGGARA BARAT, INDONESIA ON JULY 29 – AUGUST 19, 2018
Lombok island was struck by earthquakes between July until August, 2018. Three main earthquakes struck with M6.4 on July 29, M7.0 on August 5, and M6.9 on August 19, 2018. These earthquakes were located at east and north Lombok, Indonesia. The disaster caused 560 deaths, 1,460 injured and displaced about 396,032 residents to shelter. Deputy for Rehabilitation and Reconstruction, Badan Nasional Penanggulangan Bencana (BNPB) reported damage of 83,392 residential homes and 3,540 public and social facilities. There were also many infrastructure damaged by the earthquake such as roads, bridges and harbour. Based on reconnaisance made on September 7-9, 2018 in Lombok, major cause for collapse in unreinforced masonry houses was due to no lateral support in unreinforced masonry. Main reason for damage of confined masonry houses was due to diagonal crack along wall length, disintegrity of beam-column joint because of poor detailing in connection, failure at beams and columns due to use of plain bars with small bar diameter and widely spaced stirrups. Soft story occurred in reinforced concrete buildings and happend mainly to columns supporting concrete dome of mosques. On the other hand, no damage was observed for timber structure and buildings designed using applicable regulation.
Rildolva Rildolva, Mario Asneindra, Silvester Sandy Mulyadi
2018 Lombok Earthquake, buildings, civil engineering, damage by earthquake, disaster, Indonesia
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G0-011
16:30
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16:45
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A MINIMALLY DISRUPTIVE RETROFITTING STRATEGY FOR EARTHQUAKE DAMAGED REINFORCED CONCRETE SHEAR WALLS
This paper presents the results of a study on the repair of an earthquake damaged reinforced concrete (RC) shear wall using externally bonded carbon fiber-reinforced polymer (CFRP) sheets. The developed CFRP retrofitting system is designed to be less intrusive compared to traditional CFRP retrofits studied in the past. The objective of the retrofitting strategy is to reduce a structure’s operational downtime following an earthquake and completely restore the stiffness, strength, ductility, and energy dissipation capacity of the structure. The seismic performance of the proposed retrofitting system is evaluated using hybrid simulation. In this study, hybrid simulation provides a means to investigate the seismic behavior of a CFRP-strengthened RC shear wall under a very realistic load distribution, including the effects of axial load, overturning moment, and in-plane shear force. The results show that the developed minimally disruptive retrofitting system is capable of restoring the seismic performance of a damaged RC shear wall. Hybrid simulation is shown to be a useful tool to study the earthquake response of a structural component under a realistic load at different earthquake hazard levels.
Joshua Woods, David Lau, Jeffrey Erochko
fiber-reinforced polymer, hybrid simulation, reinforced concrete, retrofit, shear wall
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G0-012
16:45
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17:00
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SEISMIC RETROFIT OF A HISTORIC BUILDING IN SAN FRANCISCO USING ROTATIONAL FRICTION DAMPERS
This paper presents a retrofit case study of a historic building constructed in 1908. To improve the seismic performance with a minimum impact on the historic features of the building exterior and interior, the building was connected to a structurally separated but functionally connected adjacent 21-story existing building using rotational friction dampers. It was the first application of the rotational friction damper in the USA. The nonlinear response history analysis, retrofit design and testing of the dampers were performed in accordance with ASCE 41-17, Seismic Evaluation and Retrofit of Existing Buildings, which is the newest version of the US national standard for seismic and retrofit of existing buildings.
Insung Kim, Yvonne Tsui, Kirk Johnston
ASCE 41, Historic Building, Nonlinear Analysis, Rotational Friction Damper, seismic retrofit
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G0-013
17:00
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17:15
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A study on the damming effect of a water borne debris to the reinforced concrete buildings
A series of tsunami loading tests of reinforced concrete frame structures with the water borne debris were conducted to identify the damming effect of the water borne debris in front of the structure. The test specimen is 330 mm in story height and 650 mm in width, which modeled one-tenth scale four story one bay reinforced concrete moment resisting frame. Each story was composed by columns and beams of 45 mm square section and 15 mm width floor slab. The water borne debris is 900×720×700mm wooden boxes, which modeled Japanese traditional two story timber houses. The hydrodynamic tests were carried out in the largest water flume in CRIEPI. The waterborne debris was settled in front of the specimen and it is designed to transfer the large wave load to the adjacent specimen. The specimen collapsed with beam-side sway mechanism in lower two story due to the wave load and the damming effect of the water borne debris, while the specimen survived without the water borne debris under same induced wave. The damming effect of the waterborne debris on the wave load or wave pressure distribution are discussed in details with the observed behavior as well as with the calculated capacity.
Toshikazu Kabeyasawa, Toshimi Kabeyasawa
Damming Effect, Tohoku East Japan Earthquake, Tsunami, Waterborne Debris
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G0-018
17:15
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17:30
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EFFECTIVE WIDTH OF SLAB AT A SPAN END IN REINFORCED CONCRETE FRAMES
This paper reports on a study about the seismic performance of T-shape beams at a span end. It shows the results of static loading tests on two 2/5-scale 1×1 span three-dimensional reinforced concrete moment resisting frames with floor slab. One specimen is a standard model and it only widen the width of beams in order to increase the stiffness of transverse beam in out of plane deformation. The effective width of slab at a span end is small rather than that at a continuous span referred in past researches. Test results indicates the stiffness of transverse beam affects the effective width of slab in longitudinal direction. It shows the analytical results with the nonlinear three-dimensional models. Similar force- displacement relationships are obtained in the test and the analysis.
Toshimi Kabeyasawa, Ziling Xiao, Toshikazu Kabeyasawa
Effective width of slab, end span, out-of-plane deformation, transverse beam
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