Shaking table test on the collapse process of a three-story reinforced concrete frame structure

Li, Shuang; Zuo, Zhanxuan; Zhai, Changhai; Xu, Shiyu; Xie, Lili

doi:10.1016/j.engstruct.2016.03.032

Cited by 38 publications

(16 citation statements)

References 27 publications

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“…In the past, the seismic behavior of RC building structures has been extensively studied all over the world with a great range of approaches and objectives. In terms of experimental investigation, the test specimens were extracted from either one typical story [1][2][3][4][5][6][7] or from multi-storey [8][9][10]. The test specimens could be either an isolated RC wall with various types of cross-sectional shapes such as I-, C-and U-shaped [11][12][13][14] or RC frames with various seismic detailing [15,16].…”

Section: Introductionmentioning

confidence: 99%

Double-Curvature Test of Reinforced Concrete Columns Using Shaking Table: A New Test Setup

et al. 2019

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This paper proposes a new test setup to study the double-curvature behavior of reinforced concrete (RC) columns using shaking table. In this setup, the seismic action is simulated by the horizontal movement of a long-heavy rigid mass sitting on the top of only one test specimen. The double-curvature mechanism of specimen is affected by the movement of the concrete mass on a test rig consisting four steel hollow-section columns fully anchored to the shaking table. Application of axial load on the specimen is made possible through a pre-stressing equipment connecting to its top and bottom bases. The current setup offers two improvements over the previous ones. First, it makes available greater ranges of test data for conducting bigger sizes of the specimens. Second, it allows to directly measure the variation of axial force in the test specimens while the test implementation can be fast and easy with a high safety margin even until the complete collapse of the test units. The current test setup has been successfully applied on two ½ scaled V-shaped columns. It has been shown that the column specimen with a low axial load level of 0.05f'cAg, where f'c is the concrete strength and Ag is the cross-sectional area of the specimen, can well survive at a ground peak acceleration up to 5.5 (m/s 2 ) with a drift ratio of approximately 2.91%. Meanwhile, the column subjected to moderate axial load level of 0.15f'cAg can survive at a higher ground peak acceleration of 8.0 (m/s 2 ) with a drift ratio of 3.75%. Furthermore, it is experimentally evidenced that the Vshaped cross-section does not deform in-plane under seismic action. The angle between two planes corresponding to the column web and flange are up to 0.03 (rad). This finding is significant since it contradicts the plane strain assumption available in the current design practice.

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Section: Introductionmentioning

confidence: 99%

Double-Curvature Test of Reinforced Concrete Columns Using Shaking Table: A New Test Setup

et al. 2019

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“…The seismic response analysis is conducted using the OpenSees program [37]. The nonlinearBeamColumn elements with fiber section division are used to model beams and columns, while Concrete02 (Kent-Scott-Park) and Steel02 (Menegotto and Pinto) material models are used for the concrete and rebars [38]. The compression and tension strengths and strain at the peak stress of concrete are 20.1 Mpa, 2.01 Mpa and 0.002, respectively.…”

Section: Structural Model Used For Verificationmentioning

confidence: 99%

Retrofit Existing Frame Structures to Increase Their Economy and Sustainability in High Seismic Hazard Regions

Zhang

2019

Applied Sciences

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Featured Application: The study can be used for retrofitting frame structures to satisfy a revised seismic design code, where a building site had a low seismic hazard but now has a high seismic hazard. Abstract:The study proposes a retrofitting method with an optimum design of viscous dampers in order to improve the structural resistant capacity to earthquakes. The retrofitting method firstly uses a 2D frame model and places the viscous dampers in the structure to satisfy the performance requirements under code-specific design earthquake intensities and then performs an optimum design to increase the structural collapse-resistant capacity. The failure pattern analysis and fragility analysis show that the optimum design leads to better performance than the original frame structure. For regular structures, it is demonstrated that the optimum pattern of viscous damper placement obtained from a 2D frame model can be directly used in the retrofitting of the 3D frame model. The economic loss and repair time analyses are conducted for the retrofitted frame structure under different earthquake intensities, including the frequent earthquake, the occasional earthquake, and the rare earthquake. Although the proposed method is based on time-history analyses, it seems that the computational cost is acceptable because the 2D frame model is adopted to determine the optimum pattern of viscous damper placement; meanwhile, the owner can clearly know the economic benefits of the retrofitting under different earthquake intensities. The retrofitting also causes the frame to have reduced environmental problems (such as carbon emission) compared to the original frame in the repair process after a rare earthquake happens. Appl. Sci. 2019, 9, 5486 2 of 23 due to several aspects; e.g., the new observations from recent earthquakes, technical improvements of hazard analysis, data accumulation, and societal and economic increases.One of the issues is that a large number of existing buildings have insufficient resistant capacities to satisfy the increased design earthquake intensity. In terms of economic benefit and environmental sustainability, the best choice is to retrofit existing structures rather than demolish them and rebuild new ones. Among many retrofitting methods [4][5][6][7][8][9][10][11], the placement of viscous dampers may be one of the easy ways to improve the seismic performance of structures, because it only induces limited downtime. To date, many studies have focused on the retrofitting of structures with viscous dampers. Pekcan et al. [12] showed that the setting of the viscous damper coefficient of the story should be according to the story shear, and placements of dampers at upper stories may be not effective. Uriz and Whittaker [13] studied the effectiveness of using viscous dampers for the retrofit of a frame building before the Northridge earthquake. Silvestri and Trombetti [14] presented a parametric analysis to compare the performances offered by various systems of added viscous dampers in shear-type structures. ...

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“…In the formula, T g is a characteristic cycle (s) and T is the cycle of building structure (s). When R a = 1 0, the upper computing F u is 1. yi multiplied by the seismic acceleration corresponding to the small earthquake [11][12][13]. The ductility capacity of the upper and lower half of the i node must be the weighted average of the ductility capacity corresponding to the failure of each node.…”

Section: Seismic Reduction Coefficient In the Structural Systemmentioning

confidence: 99%

Evaluation of Seismic Performance of Reinforced Concrete Frame Structures in the Context of Big Data

Zheng

Wang

2019

Complexity

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In the era of big data, the efficient use of idle data in reinforced concrete structures has become a key issue in optimizing seismic performance evaluation methods for building structures. In this paper, based on the evaluation method of structural displacement seismic performance and based on the characteristics of high scalability and high fault tolerance of the cloud platform, the open source distributed and storage features of the Hadoop architecture cloud platform are introduced as a subproject of Apache Nutch project, Hadoop cloud platform. With features such as high scalability, high fault tolerance, and flexible deployment, the storage platform is secure, stable, and reliable. From the evaluation of the seismic performance of newly-built buildings and existing damaged buildings, according to the structural strength-ductility theory of the structure, the building structure resists earthquakes with its strength and ductility and buildings are divided into four categories. Due to the influence of time or seismic damage on the structure of reinforced concrete frame structures, their material properties are often deteriorating. Using the distributed computing design concept to efficiently process big data, a dynamic evaluation model for the seismic performance of reinforced concrete frame structures is established. A project of a 10-story reinforced concrete frame structure was selected for calculation and analysis; the engineering example was used to verify the accuracy and efficiency of the model, and the seismic performance of the floor was analyzed. It can be seen that the initial stiffness index of the structure is not sensitive to the damage location of the structure. The platform based on the concept of distributed computing big data processing can effectively improve the efficiency and accuracy of the evaluation of reinforced concrete frame structures.

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Shaking table test on the collapse process of a three-story reinforced concrete frame structure

Cited by 38 publications

References 27 publications

Double-Curvature Test of Reinforced Concrete Columns Using Shaking Table: A New Test Setup

Double-Curvature Test of Reinforced Concrete Columns Using Shaking Table: A New Test Setup

Retrofit Existing Frame Structures to Increase Their Economy and Sustainability in High Seismic Hazard Regions

Evaluation of Seismic Performance of Reinforced Concrete Frame Structures in the Context of Big Data

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