A series of shaking table tests on a scaled model were conducted to investigate the effect of steel braces on reinforced concrete frame structure across earth fissure under earthquake. In the test, a 1/15 scaled model structure taking into account soil-structure interaction was designed on the basis of similarity theorem. Seismic response data, including acceleration responses, displacement responses, shear force distributions, and strain amplitudes of column reinforcement were obtained and analyzed by comparing the results of unbraced and braced structure. Results show that with the peak ground acceleration of input motions increased, maximum of inter-story drifts, shear forces, and strain amplitudes increased, whereas the acceleration amplification factors decreased. Steel braces could obviously reduce the seismic response of the structure, indicating that this retrofit method is an effective control measure for structures across the earth fissure under earthquake. These results are significant for studying the effect of earth fissure on seismic responses of structures.
showed that the performance of the soil-structure system was influenced by the frequency and amplitude of the input motion and the soil nonlinear behavior. Chen et al. [32] conducted a series of shaking table tests to investigate the effect of pulse-like ground motion on a multistory subway station.The testing results indicated that the pulse-like ground motion increased the dynamic responses of the subway station and the surrounding soils mainly due to its inherent rich low-frequency component and high energy absorption. However, on the basis of the author's knowledge, no research was found in the literature on shaking table test of RC frame structure across the earth fissure considering soil-structure interaction.In this paper, a series of shaking table tests were conducted aimed at understanding the seismic response of RC frame structure across the earth fissure. The earth fissure considered in this paper was referred to the earth fissure of Northwestern University-Northwestern Polytechnical University (f 4 ). The seismic performance of the RC frame structure under three earthquake motion records was evaluated and compared. 2 | EXPERIMENTAL PROGRAM 2.1 | Characteristics of the shaking table The shaking table tests were carried out at the Key Laboratory of Structure and Earthquake Resistance in Civil Engineering, Xi'an University of Architecture and Technology. The shaking table has an area of 4 m × 4 m and can produce three-dimensional, six-degree-of-freedom motions.FIGURE 2 The crack of the City Wall, Xi'an FIGURE 1 The crack of Tang Yan Road, Xi'an 2 of 15 XIONG ET AL. Zhongming Xiong is a professor of Department of Civil Engineering, Xi'an University of Architecture and Technology. His research interests are earthquake engineering and soil-structure interactions. Xuan Chen is a PhD student of Department of Civil Engineering, Xi'an University of Architecture and Technology. His research focuses on soil-structure interactions. Chao Zhang is a PhD student of Department of Civil Engineering, Xi'an University of Architecture and Technology. His research focuses on earthquake engineering. Xiaopeng Huo is a PhD student of Department of Civil Engineering, Xi'an University of Architecture and Technology. His research focuses on seismic design of building structures.
Summary
To investigate the effect of soil‐structure interaction (SSI) on the seismic response of frame buildings on collapsible loess, the secondary development of Abaqus was used to realize the embedding of the unified strength theory constitutive model. Meanwhile, a new nonlinear elastic model generated by the unified strength theory (b, the failure criterion parameter in the unified strength theory, equals 0.5) was developed. Seven‐ and nine‐story frame buildings were selected as engineering examples in this study. The outcomes indicate that the nonlinear behavior of the loess–pile has a significant effect on the dynamic interaction of both group pile foundations and the superstructure under strong earthquakes. This results in an amplification of the displacement response and a reduction in inter‐story shear force. As the foundation soil becomes softer, the K‐type distribution of both peak accelerations and inter‐story displacements along height becomes more obvious in general.
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