Abstract
This paper studies the influence of the characteristics of the near-fault ground motion on the seismic responses of the structure with energy dissipation devices including soil-structure interaction (SSI). A ten-story reinforced concrete frame rested on soft site is introduced, and the viscous dampers added in the frame are designed. The numerical analysis method of the soil-structure system with viscous dampers is established through ANSYS program. In addition, the response spectra of the main characteristics of the near-fault ground motion, like hanging wall effect, velocity pulse-like effect, and forward-directivity effect, are investigated carefully to learn the features of spectra energy distribution. And then, the dynamic time-history analysis is performed on the SSI system with and without viscous dampers subjected to the selected near-fault ground motion. The study reveals that the seismic responses of the structure subjected to near-fault ground motion with hanging wall effect are obviously larger than those of the footwall effect, indicating the distinct hanging wall effects on the structural dynamic responses. In addition, the performance of the structure with viscous dampers is more influenced by the ground motion containing fling-step effect than that with forward-directivity effect. Moreover, the influence of the horizontal component of forward-directivity ground motion on the seismic responses of the structure is more obvious than that of parallel component ground motion. Consequently, the hanging wall effect, velocity pulse, and horizontal component in forward-directivity effect of the near-fault ground motion have distinct influence on the seismic responses of the structure with energy dissipation devices considering SSI effect, providing insight towards the performance-based seismic design of buildings rested at the near-fault sites considering the seismic SSI effect.
Highlights
Analytical Modeling of the soil-structure interaction (SSI) System with Energy Dissipation DampersIt reveals that the viscous dampers have a good role in decreasing the interstory drift responses of the structure
Introduction to PracticalEngineering. e practical engineering is a ten-story reinforced concrete frame structure supported by a piled raft foundation on the oft site.e floor plane of the standard story is shown in Figure 1. e sectional dimensions of the column, beam, and pile are 550 mm × 550 mm, 300 mm × 500 mm, and 450 mm × 450 mm, respectively. e dead load of the standard floor is 5.0 kN/m2, and the live load is 2.0 kN/m2
A ten-story reinforced concrete frame rested on soft site is introduced, and the viscous dampers added in the frame are designed. e numerical analysis methods of the soil-structure system with viscous dampers are established through ANSYS program. en, near-fault ground motions with different characteristics are selected from Chi-Chi earthquakes, e.g., the hanging wall and footwall effect, the pulse-like ground motions like forwarddirectivity velocity pulse, fling-step velocity pulse, and nonspeed velocity pulse, and horizontal component and parallel component in forward-directivity ground motions
Summary
It reveals that the viscous dampers have a good role in decreasing the interstory drift responses of the structure. The superstructure subjected to the original excitations in the hanging wall experiences more interstory shear force than that in the footwall cases, demonstrating the distinct hanging wall effect in the nearfault ground motions, while the conclusion is contrary with the modulation of PGA. The hanging wall effect is altered and not obvious with the modulation of PGA. en, it did not suggest the real features of the structural response subjected to original near-fault ground motions
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