| PaperNO | Paper / Abstract |
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SE4-003
10:50
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11:10
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ANTI-CATASTROPHE PERFORMANCE IMPROVEMENT OF MULTI-PIPE INTEGRATED BRIDGE PIER WITH HIGH PERFORMANCE SHEAR PANEL DAMPERS
The sustainable economic development mainly in urbanized areas requires to provide the function of infrastructures even for the rehabilitation or reconstruction of aged structures. In order to meet this requirement, modern bridge construction is preferred because of rapid and efficient construction and at same time prioritize the seismic performance improvement particularly in Japan. One of the solution is the application of spiral steel pipes as Multi-Pipe Integrated bridge piers proposed by Hanshin Expressway Corporation and its collaborators. In order to improve anti-catastrophe performance of the multi-pipe integrated bridge pier, the further study of improved new shear panel damper which connected the steel pipes of the pier is carried out analytically. The stiffened shear panel with vertical stiffeners and the corrugated shear panel are proposed and assessed in conjunction with the earthquake response analysis subjected to strong ground motions. It is found from analytical results that the energy absorption and the deformation as seismic performances of these new shear panels are improved because the shear buckling deformation of the panels can decrease. Additionally, the plastic strain of the welding part between the flange plate or the stiffened plate and the shear panel in the corrugated shear panel can decrease in comparison with the ordinary flat shear panel. It is also demonstrated that the dynamic response can be reduced by applying such high performance shear panel dampers.
Kunitomo Sugiura, Kunitaro Hashimoto, Kosuke Otsuka
Multi-pipe integrated bridge pier, Shear panel damper, Spiral steel pipe
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SE4-002
11:10
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11:30
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PARAMETRIC STUDIES OF STEEL FIBER REACTIVE POWDER CONCRETE BRIDGE PIER SUBJECTED TO LATERAL MONOTONIC LOADING
Reactive powder concrete (RPC) is a type of ultra-high performance self-compacting concrete prepared by replacing normal aggregate using quartz sand, quartz powder, and silica fume. In this research, RPC’s brittle behavior is improved by adding steel fibers into the RPC mixture, increasing the tensile and flexural strength of the matrix. Such a matrix is known as Steel Fiber Reactive Powder Concrete (SFRPC). This paper presents parametric studies of SFRPC by using ABAQUS 3D nonlinear FEA in simulating the compressive, flexural, and fracture behaviors of SFRPC. In this study, Concrete damage plasticity (CDP) material is utilized to simulate SFRPC. The parametric studies are carried out with respect to mesh size, dilation angle, and viscosity parameter. The numerical results of SFRPC material testing are validated using experimental data, and the differences are found to be within acceptable limits. Furthermore, the study is extended to simulate the behavior of SFRPC bridge pier subjected to lateral monotonic loading.
Patria Kusumaningrum, Muhammad Fajar
ABAQUS, bridge pier, compressive strength, concrete damage plasticity, experiment, finite element analysis, flexural strength, fracture energy, parametric study, steel fiber reactive powder concrete, tensile strength
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SE4-016
11:30
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11:45
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MITIGATION OF RESIDUAL DISPLACEMENTS OF RC BRIDGE COLUMNS BY PARTIALLY UNBONDED HIGH-STRENGTH STEEL STRANDS
The residual displacements of bridge columns after an earthquake is an important factor that affects the functionality of bridges after an earthquake. In this research, a new type of column is developed. The new column uses partially unbonded high-strength steel strands as an elastic element to increase the post-yielding stiffness so as to reduce the residual displacement of the column after an earthquake. Results of tests on large-scale columns showed a 3.5% post-yielding stiffness ratio was achieved with the partial unbonded length used in this research. In comparison, the counterpart conventional column showed a post-yielding stiffness ratio of -0.5%. Based on the hysteretic behavior observed from the tests, nonlinear response history analysis was conducted. The analysis results showed the residual displacement of conventional columns under near-fault ground motions was significant (more than 1%). In contrast, the residual displacement was significantly reduced in the case of the proposed columns.
Yu-Chen Ou, Jhen Wei Wu
bridges, post-yielding stiffness, residual displacement, steel strands
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SE4-013
11:45
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12:00
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COMPARISON BETWEEN THE SEISMIC PERFORMANCE OF FULLY JOINTLESS SEMI-INTEGRAL AND JOINTED BRIDGES
Jointless bridges have been proven to be of excellent seismic performance owing to the good integrity and soil-structure interaction. In this study, seismic performance of an innovative jointless bridge, namely fully jointless semi-integral bridge (FJSIB), is analyzed and compared with the jointed bridge. The distinct innovation of the FJSIB is that the two road-bridge expansion joints are replaced with an approach pavement system (APS) to achieve “zero maintenance”. The APS includes two crucial elements: a reinforced concrete approach pavement (RCAP) and a ground beam embedded in the embankment. The interfacial friction between RCAP and subgrade, the hysteretic behaviour of RCAP and the soil-ground beam interaction can dissipate sufficient seismic energy and reduce the seismic response of the bridge. A rational nonlinear finite element model of APS is established by the OpenSees software. The results show that the seismic response of the FJSB are only 1/(1.8～2.3) that of the jointed bridge and the APS can effectively prevent the deck from punching the abutment back wall and avoid deck unseating. The fully jointless semi-integral bridges can still ensure the normal traffic even after the major earthquake, while the jointed bridges have been severely damaged. The FJSIB can be used in new bridge construction as well as old bridge retrofitting, especially in the strong earthquake area.
Yong-chun Ma
approach pavement system, Jointless bridge, seismic performance, semi-integral bridge
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SE4-011
12:00
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12:15
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STUDY ON GFRP AND STEEL HYBRID TEMPORARY RESCUE BRIDGE FOR EMERGENCY DISASTER RELIEF
Typhoons and earthquakes, occur frequently in Taiwan, often lead to the washout or collapse of river bridges, thereby causing traffic interruption. A temporary bridge was proposed to restore traffic as soon as possible and to provide necessary emergency rescue services in the aftermath of these events. The objective of this paper was to present an emerging design concept and verification of a temporary rescue bridge. An asymmetric, self-anchored, cable-stayed bridge with heavyweight segments used as a counter-weight at the rescue end and river-spanning segments constructed with lightweight materials was proposed. The experimental assembly and results demonstrated the feasibility of the proposed design concept, and showed good potential for using an asymmetric self-anchored cable-stayed bridge for temporary rescue operations. This study develops such a bridge system by using a self-balancing approach and a cantilever incremental launching method. An asymmetric self-anchored cable-stayed bridge is proposed. The structural segments are constructed from heavyweight materials (e.g., steel and concrete) that function as counterweights at the rescue end, and the spanning segments are constructed from lightweight materials (e.g., composite materials). This allows the span to be increased so that it can easily reach the isolated island end without any further supports or foundations. The results of this study are summarized as follows: (1) the proposed design concept and procedure for designing a temporary rescue bridge is helpful for bridge designers in term of problem-solving strategy for temporary rescue bridge design; (2) the 20-m span temporary rescue composite bridge was constructed by 30 unskilled workers within six hours using only manpower, simple tools, and a small truck with a crane, which meets the requirements of emergency disaster relief.
Fang-Yao Yeh, Kuo-Chun Chang, Yu-Chi Sung
asymmetrical cable-stayed bridges, design concept and procedure of rescue bridge, emergency disaster relief, glass-fiber-reinforced composite, lightweight, portable, and reusable bridge
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