Research on Bridge Damage-Reduction Seismic Performance with Variable Parameter Cable-Unseating Prevention Devices

The anti-seismic measures is effective in reducing the seismic damage of bridge, unseating prevention device is an effective structural measure to prevent collapse under unexpected earthquake, and its parameter will affect the function of unseating prevention devices. Based on relational design standards, the damage-reduction seismic performance of unseating prevention devices with variational design parameter have been analysis. The research results show that the unseating prevention devices with rational parameters can prevent collapse of the structure; the damage-reduction seismic performance of bridge was influenced by the cable rigidity and primary clearances. The unseating prevention devices will improve the seismic performance and integrality of bridge, but higher requirements have been proposed for the substructure of bridges.

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Collapse-Prevention Design and Damage-Reduction Seismic Performance Analysis of Bridges

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.638-640.1997 ◽

2014 ◽

Vol 638-640 ◽

pp. 1997-2000 ◽

Cited By ~ 1

Author(s):

Yu Min Zhang ◽

Ying Cui ◽

Jing Liu

Keyword(s):

Performance Analysis ◽

Seismic Performance ◽

Relative Displacement ◽

Seismic Load ◽

Design Standards ◽

Research Results ◽

Collapse Prevention ◽

Damage Reduction ◽

Structural Measure ◽

At Home

As the crucial junction in transportation lines, more attention should pay to the safety of bridges. However, the collapse of bridges under earthquake threats the safe of lifeline engineering seriously. Unseating prevention devices are the effective structural measure to prevent collapse under unexpected earthquake. The design of unseating prevention devices need not only to meet the deformation demand of bridge during normal operations, but also to limit the oversize displacement under unexpected earthquake. Combined with relational design standards at home and abroad, unseating prevention devices have been designed for bridge to prevent collapse. The research results show that the unseating prevention devices with reasonable parameter will decrease the relative displacement between superstructure and substructure, improve the seismic performance and integrality of bridge, and make the seismic load to be well-distributed among the piers.

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Seismic Damage Analysis on the Continuous Girder Bridge of Urban Rail Transit Line

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.488-489.398 ◽

2014 ◽

Vol 488-489 ◽

pp. 398-402 ◽

Cited By ~ 1

Author(s):

Hai Qing Li ◽

Yong Jun Ni ◽

Xin Gang Liu ◽

Jin Xing Yan

Keyword(s):

Seismic Performance ◽

Evaluation Method ◽

Research Direction ◽

Seismic Damage ◽

Urban Rail Transit ◽

Rail Transit ◽

Damage Analysis ◽

Seismic Performance Evaluation ◽

Damage Indices ◽

Urban Rail

Seismic damage was the key reason which resulted in the serviceability degradation or collapse of the bridge. How to quantify the seismic damage and evaluate the seismic performance of the bridge under earthquakes through the damage analysis was the significant research direction in the performance based seismic design. In this paper the Park-Ang model (a well-known dual parameters model) and its modification version used for the damage evaluation of the concrete structure were compared. Furthermore, through the definition of the damage indices of the models based on the modified Park-Ang model and the descending slope of the IDA(incremental dynamic analysis) curve, the seismic damage levels of the typical bridge in the urban rail transit line under the designated earthquakes were analyzed, respectively. It was shown from the results that the calculated results from the two model was essentially consistent. The damage analysis based evaluation method was feasibly used for the seismic performance evaluation of the bridge.

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A method of seismic performance evaluation based seismic fragility analysis

MATEC Web of Conferences ◽

10.1051/matecconf/201817504036 ◽

2018 ◽

Vol 175 ◽

pp. 04036 ◽

Cited By ~ 1

Author(s):

Feng Wang ◽

Zhongzheng Guo

Keyword(s):

Dynamic Analysis ◽

Seismic Performance ◽

Damage Index ◽

Structural Models ◽

Seismic Damage ◽

Damage Parameter ◽

Fragility Analysis ◽

Seismic Fragility ◽

Damage Level ◽

Seismic Performance Evaluation

For evaluating seismic performance of structures, a method is presented based on increment dynamic analysis and seismic fragility analysis. Firstly, the failure probability equation is deduced, in which the relationships of seismic intensities and response demands can be determined by the increment dynamic analysis. On this basis the probabilities with different damage levels under different seismic intensities are obtained. Secondly, damage parameter R is defined and used to reflect seismic damage level of structures, damage index Re is defined and used to compare with R range and determine the situation of seismic damage. Finally, the procedure is proposed for evaluating structural seismic performance. In order to verify and demonstrate the method, three structural models are designed, and typical earthquake records are selected. The results of example analysis show that this method is convenient for evaluating multi-levels seismic performance of structures.

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Effects of friction-based fixed bearings on seismic performance of high-speed railway simply supported girder bridges and experimental validation

Advances in Structural Engineering ◽

10.1177/1369433218798120 ◽

2018 ◽

Vol 22 (3) ◽

pp. 687-701 ◽

Cited By ~ 2

Author(s):

Lizhong Jiang ◽

Shanshan Cao ◽

Biao Wei

Keyword(s):

Friction Coefficient ◽

Seismic Performance ◽

High Speed ◽

Dynamic Test ◽

Seismic Damage ◽

Damage State ◽

High Speed Railway ◽

Simply Supported ◽

Girder Bridges ◽

Seismic Force

This study investigated the seismic performance of simply supported girder bridges with a span length of 32 m. Those bridges were a common part in China’s high-speed railway system and used spherical bearings to connect girders and piers. First, a finite element model of the scaled bridge with a geometrical similarity ratio of 1:8 was established by OpenSees. Second, five seismic damage states of fixed bearings and piers were defined based on the deformation failure criterion. Finally, an incremental dynamic analysis and a pseudo-dynamic test were performed to evaluate the effects of friction-based fixed bearings on the seismic response and damage state of bearings and piers. Results show that the sliding of friction-based fixed bearings effectively restricts the force transmitting between piers and girders, and reduces the seismic damage of piers. Those bearings with a small friction coefficient lead to a large relative displacement between piers and girders, while those bearings with a large friction coefficient cause a large seismic force exceeding the yield load of piers. Therefore, an appropriate friction coefficient of friction-based fixed bearing should be determined to achieve an optimal seismic performance of bridge according to the specific conditions of bridge and ground motion inputs.

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Experimental Studies on Seismic Performance of Rigid-frame Extradosed Cable-stayed Bridges

IABSE Congress, New York, New York 2019: The Evolving Metropolis ◽

10.2749/newyork.2019.0295 ◽

2019 ◽

Author(s):

Xianzhi Wang ◽

Jianzhong Li ◽

Wei Guo

Keyword(s):

Seismic Performance ◽

Experimental Studies ◽

Seismic Damage ◽

Test Model ◽

Test Results ◽

Rigid Frame ◽

Shake Tables ◽

Tongji University ◽

Design Construction ◽

Cable Stayed Bridges

<p>With the aim of further understanding the seismic performance of extradosed cable-stayed bridges, this paper presents an experimental investigation of a three-pylon rigid-frame extradosed cable-stayed bridge by conducting 1/20 scaled longitudinal shake tables model tests at the laboratory of Tongji University, Shanghai, China. The design, construction and testing protocol of the test model are firstly introduced. Observation of the seismic damage situation and empirical data on the seismic responses of the test model are then provided. The test results show that: (1) severe seismic damage appeared at the bottom and upper parts of piers and damage at the bottom parts were much heavier; (2) no damage was observed on short pylons; (3) structural stiffness degradation occurred when PGA≥0.4g; (4) the vibration of the short pylon almost has no contribution in the displacement at the pylon top.</p>

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Seismic Damage Reduction of a Structural System based on Nontraditional Sliding Interfaces with Graphite Lubrication

Journal of Earthquake Engineering ◽

10.1080/13632469.2016.1264326 ◽

2017 ◽

Vol 22 (4) ◽

pp. 666-686 ◽

Cited By ~ 3

Author(s):

Ryuta Enokida ◽

Takuya Nagae

Keyword(s):

Seismic Damage ◽

Structural System ◽

Damage Reduction ◽

Sliding Interfaces

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Introspection on Anti-Seismic of Rural Housing

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.671-674.1403 ◽

2013 ◽

Vol 671-674 ◽

pp. 1403-1407

Author(s):

Wei Jian Li ◽

Chang Qing Gong ◽

Xiao Song Ren

Keyword(s):

Seismic Performance ◽

Seismic Damage ◽

Structural System ◽

Rural Housing ◽

Severe Damage ◽

Yushu Earthquake ◽

Supervision System ◽

Structural Capacity ◽

The Government ◽

Design Construction

Collapse and severe damage of rural housing were found to be the main seismic damage of rural housing, which leads to a lot of casualties and loss. The violent earthquakes, such as Wenchuan earthquake and Yushu earthquake caused serious damages and gave lessons to the society for better seismic performance of rural housing. Due to limitation of the fund, technology and information, the rural houses lack of normal design, construction and necessary supervision of the government. The insufficient structural capacity and weak integrity may result in the collapse of bearing members and roof or truss under disaster-causing action. The typical damage of rural housing is presented and analyzed for demonstration. Some suggestions to effectively enhance the seismic performance is hence given. From the macroscopic view, publicity for more seismic knowledge should be proceeded and the complete supervision system should be improved. And the technological measure is stressed for better collapse resistant capacity by designing reasonable structural system and reliable connection.

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Study on Seismic Damage Model with Double Variables of the SRHSHPC Composite Columns

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.417-418.925 ◽

2009 ◽

Vol 417-418 ◽

pp. 925-928

Author(s):

Shan Suo Zheng ◽

Liang Zhang ◽

Bin Wang ◽

Lei Li ◽

Lei Zeng

Keyword(s):

Seismic Performance ◽

High Performance Concrete ◽

Concrete Strength ◽

Damage Model ◽

Damage Index ◽

Seismic Damage ◽

Statistical Regression ◽

Loading Cycle ◽

Damage Models ◽

History Of

The seismic performance and seismic damage model for steel reinforced high strength and high performance concrete (SRHSHPC) composite frame columns subjected to constant axial load and cyclically variety flexural loading was investigated experimentally. The main influencing parameters, including shear span ratio, axial compression ratio, stirrup ratio and concrete strength, on the seismic performance and seismic damage of the SRHSHPC frame columns is studied. From the test results, the failure mechanism is analyzed and damage quantization criterion is obtained. Several existing seismic damage models are comparatively analyzed. And then, the variation history of accumulated hysteretic energy of the specimens under different loading cycle indexes is figured out, and influence of different test parameters on it is also discussed. Finally, the damage index of the SRHSHPC columns is compared to the existing seismic damage models, and the double variables seismic damage model adapted for the SRHSHPC structure is established by statistical regression theory. The rule of damage evolvement for the specimens is proposed employing variation history of the damage index under different loading cycle indexes. The analytical results indicate that the seismic performance of the SRHSHPC composite column is good, and the double variables damage model could give a quantitative description for damaging process of the samples, which is a reference for seismic damage design of the SRHSHPC structure.

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Performance-Based Multiobjective Optimal Seismic Retrofit Method for a Steel Moment-Resisting Frame Considering the Life-Cycle Cost

Mathematical Problems in Engineering ◽

10.1155/2014/305737 ◽

2014 ◽

Vol 2014 ◽

pp. 1-14 ◽

Cited By ~ 2

Author(s):

Hyo Seon Park ◽

Dong Chul Lee ◽

Byung Kwan Oh ◽

Se Woon Choi ◽

Yousok Kim

Keyword(s):

Seismic Performance ◽

Life Cycle Cost ◽

Optimization Technique ◽

Seismic Retrofit ◽

Seismic Damage ◽

Damage Cost ◽

Pareto Solution ◽

Steel Moment Resisting Frames ◽

Moment Resisting Frames ◽

Moment Resisting

This study proposes a performance-based multiobjective optimization seismic retrofit method for steel moment-resisting frames. The brittle joints of pre-Northridge steel moment-resisting frames are retrofitted to achieve ductility; the method involves determining the position and number of connections to be retrofitted. The optimal solution is determined by applying the nondominated sorting genetic algorithm-II (NSGA-II), which acts as a multiobjective seismic retrofit optimization technique. As objective functions, the initial cost for the connection retrofit and lifetime seismic damage cost were selected, and a seismic performance level below the 5% interstory drift ratio was employed as a constraint condition. The proposed method was applied to the SAC benchmark three- and nine-story buildings, and several Pareto solutions were obtained. The optimized retrofit solutions indicated that the lifetime seismic damage cost decreased as the initial retrofit cost increased. Although every Pareto solution existed within a seismic performance boundary set by a constraint function, the seismic performance tended to increase with the initial retrofit cost. Analysis and economic assessment of the relations among the initial retrofit cost, lifetime seismic damage cost, total cost, and seismic performance of the derived Pareto solution allow building owners to make seismic retrofit decisions more rationally.

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