Seismic Resistant Design of Building.pptx

It is about seismic resistant Design of Building.

1. Sesmic resistant design for buildings SEISMIC RESISTANT DESIGN FOR BUILDINGS PRESENTED BY DIVIN S V - 2303717710321030 JENISHA S I -2303717710322041

2. REINFORCED CONCRETE BUCKLING RESTRAINED BRACED FRAME BUILDINGS

3. ABSTRACT: Buckling-restrained braces (BRBs) help protect concrete frames during earthquakes by dissipating seismic energy. This study proposes an optimized BRB design based on nonlinear analysis, showing that traditional linear methods are overly conservative. The new approach improves damage distribution and meets multi-performance seismic design goals.

4. Introduction: RC moment frames have suffered major damage in past earthquakes. RC frames with buckling-restrained braces (RC-BRBs) improve seismic performance by allowing BRBs to yield and dissipate energy, keeping the frame elastic. Existing design methods often oversimplify behavior , ignoring frame stiffness and deformation effects. The shear ratio method distributes seismic forces between BRBs and frames but assumes uniform BRB stiffness, limiting design flexibility.

5. Design method: Buckling-Restrained Braces (BRBs) are widely used as energy-dissipating components in buildings .Their core advantage lies in the ability to restrain buckling using infill materials such as concrete. Types of BRBs based on construction constraints: Energy dissipation mechanism: Grouting type All-steel type Enclosed reinforced concrete (RC) type The core plate is prevented from buckling by a restraint unit. Seismic energy is dissipated through stable tension and compression deformation of the core.

6. Conventional RC-BRB Frame Design: Ensure BRBs yield before the main RC frame to act as the first line of defense against earthquakes. The purpose of finding the inter-story displacement angle corresponding to BRB yield (using equations like the ones you shared) is to ensure correct seismic performance and proper sequencing of structural response in an RC-BRB frame system. Geometric Relationship: δ =d cos u Where: δ: Axial deformation of BRB d: Stratified deformation θ: Horizontal inclination angle of the BRB Inter-Story Drift Angle at BRB Yield: α = (1+ λ ) fy /(E sin 2u) Where: α : Inter-story displacement angle fy ​: Yield strength of BRB core l: Ratio of yield segment length to total BRB length E: Elastic modulus of BRB core θ: Inclination angle of BRB

7. SEISMIC DESIGN PARAMETERS: 7 The design requirements of the second-defendant line can be expressed as quantitative performance targets . Earthquake condition : Main structure → remains undamaged . BRBs → yield and dissipate energy . Inter-story displacement angle limits are taken from the current seismic code (3.10.3.,9). Δupy /h → represents the inter-story displacement angle when BRB yields .

8. Hysteresis energy distributions: Initial design uses traditional elastic method; second-defendant line design follows equation (2). Final design is optimized iteratively via Pushover analysis. Figure shows BRB energy under JG0393 medium earthquake: X-axis: time; Y-axis: % of max energy. Yellow: x-direction BRB dissipation; Red: other units. 0–10 s: elastic deformation; no hysteresis energy in BRB or frame. 10–15 s:Initial design energy <13%, mainly from beams/columns. Final design energy 85%, BRB contributes 48%.10–12.5 s: BRB energy ≈ total energy → BRB dissipates energy before frame.

9. CONCLUSION: 9 New RC-BRB frame design method achieves two performance levels. BRB distribution optimized via pushover analysis. Frame model validated against experimental BRB data. Conventional methods slightly overestimate seismic effects but are conservative. Proposed design meets perform Hysteresis energy distributionsance goals, improves seismic redundancy, and keeps the main frame undamaged under medium earthquakes.

10. Quote Without the process that creates earthquakes, our planet could not sustain life. - Adam Hamilton Logo here 10

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