Comparison of methods for attenuating the base shear of Renforced concrete structures
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Base (topology)
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The finite element formulations of steel-concrete composite (SCC) beams considering interlayer slip with end shear restraint is established. Elastic seismic response of SCC frame structures under different shear connection stiffness and slip boundary conditions are examined. The influences of the shear connection stiffness and the slip boundary condition on elastic seismic response are analyzed. With the shear connection stiffness increasing, the free vibration frequencies increase and the seismic responses decrease. The natural vibration properties of SCC frame structures and seismic responses are also significantly affected by the slip boundary condition, and it should be properly imposed on all composite beams in seismic response analysis.
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Abstract: Structural analysis is the science of determining the effects of different loads on structures. Structural stability and stiffness are a main concern in any high-rise structures. Shear walls are structural members that are mainly responsible for resisting lateral loads predominant on structures. They are mainly responsible to increase the stiffness, reduce story drift and displacement. In order to have a comprehensive understanding about the contribution of shear wall, following research is carried out. This research involves comparing two G+16 structures; one without a shear wall and one with it. The structure has 4 bays of 3m each along X direction and Z direction. In this, we will see how shear wall resists lateral sway and reduces story drift and increases stiffness. As the height increases, the shear wall absorbs more lateral load than the frame. The software to be used for analysis is STAADPro. Keywords: STAADPro, Stiffness, storey displacement, storey drift.
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A new seismic energy dissipation shear wall structure is proposed in this paper. The new shear wall is one with purposely built-in vertical slits within the wall panel, and various seismic energy dissipation devices are installed in the vertical slits so that the dynamic characteristics of the structure (for instance, lateral stiffness, ductility and fundamental period) can be controlled. In order to verify this concept, shaking table tests of two 10-story shear wall models were carried out, and the seismic behavior of the two models are studied by analyzing the test data and computing the nonlinear seismic response of the models.
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Seismic performance analysis is carried out for a frame shear wall structure subjected to major earthquake,and with installation of mild metallic shear type damper in the coupling beams. The analysis results show that while restrained boundary elements set in reinforcing area on the bottom of shear wall,the structure can't meet the requirement of no collapse in rare earthquake,and setting restrained boundary elements along the whole height of the shear wall is necessary. After the aseismic structural measures are improved,the structure reach the rare seismic fortification target. Accumulated compressive damage of shear wall is mitigated effectively. Coupling beam dampers on each floor dissipate energy and improve the seismic performance of structure greatly.
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In order to insure the multiple aseismic fortification line performance for a frame-shear wall structure in tall buildings,in the JGJ 3-2002,Technical specification for concrete high-rise building the calculation method for the seismic shearing force of frame columns of a frame-shear wall structure has been modified.Based on the Determination of seismic forces acting on frame in high-rise frame-shear wall structures study,in this paper a practical approach in segments for the seismic shearing force of a frame-shear wall structure is finally presented,which is based on a deformation index,and at the same time,the stiffness degeneration on the shear wall is taken into account.Furthermore,this method is compared with the former by the result of an example.The results indicate that this method is necessary and available.This method supplies an important reference for the supplement of design codes.
Internal forces
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Shearing (physics)
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If the four basic parameters to define seismic design forces, i. e. seismic shear, seismic shear coefficient, seismic force and seismic coefficient, are defined as functions of normalized weight, the relationships between these parameters are mathematically given. A uniform shear type elastic body fixed at the base is analyzed in order to explain the base shear and the distribution of the shear along the height of a building. Lumped mass systems are also analyzed and the formula to give an appropriate distribution of seismic shear was proposed. Tower-on-a-base type buildings, whose base shear and the distribution of the shear are very different from those of the other types of buildings, are analyzed. Finally, the design method for a tower-on-a-base type building is proposed.
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Base (topology)
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