Master CSI Perform 3D for Nonlinear Structural Analysis

Create a new structure in Perform 3D, set units and description, and transfer a four-story RC model from Sap2000, then export the analyzed model with masses and diaphragms.

Model a three-story structure in perform 3d without Sap2000. Create nodes and duplicate them to form 4 bays in X and 3 bays in Y; define supports and lumped masses.

Continue with the test model to build p-delta columns connected to each floor diaphragm, enabling geometric nonlinearity and efficient p-delta simulations for medium and high rise buildings.

Import from Sap2000, clean the model by removing slabs, and focus on moment frame elements and core for nonlinear behavior; then define x and y views to navigate.

Define materials and cross-sections from Sap2000 imports, switch to trilinear inelastic models, and set beam and column properties with inertia and modifiers, then plot interaction diagrams.

Explore non-linear structural modeling with Perform 3D, covering continuum finite element modeling, distributed inelastic (fiber) section modeling, and lumped plasticity or plastic hinges to assess structural performance.

Explore nonlinear components by modeling force-deformation relationships, including moment-rotation and stress-strain curves. Build backbone envelopes and analyze hysteresis loops with elastic-perfect-plastic and trilinear options, with or without strength loss.

Define beam and column plastic hinges for a moment frame using inelastic rotation hinges, trilinear force-deformation curves, strength loss, and three performance levels: immediate occupancy, life safety, and collapse prevention.

Define nonlinear shear-wall fiber sections in Sap2000 by creating auto-size and fixed-size fiber schemes with concrete and steel reinforcement, wall thickness, and fiber coordinates.

Create internal and external beam and column compounds with endzones, plastic hinges, elastic sections, and self-weight, then define shear wall compounds with core web, core flange, and reinforcement.

Define a wall hinge rotation gage with three performance levels for immediate occupancy, life safety, and collapse prevention, then assign compounds to columns, beams, and walls and set wall orientations.

Define drifts and limit states for structural analysis, using SAP2000 outputs to set deformation and drift thresholds for columns, beams, and walls, including immediate occupancy, life safety, and collapse prevention.

Conclude modeling phase by defining load patterns for load cases in sap2000. Define four load patterns: dead, live, wall, and floor cover, with nodal loads and self-weight derived from elements.

Set up gravity and response spectrum load cases, apply linear gravity loads per ASCE-07 with dead and 25% live loads, and configure 12-mode spectrum for modal analysis.

Define pushover load case in static pushover analysis, set two directions with an inverted triangle displacement pattern, 50 steps, 200 events, and 8% roof drift for base shear capacity curve.

Define time history load cases by uploading three earthquake records and pairing horizontal components into east-series and north-series, then set durations and a 0.005 s time step.

Set up the analysis series in the analysis phase, run static and dynamic analyses (response spectrum, pushover, time history), include gravity and p-delta effects, and apply modal damping before executing.

Review modal analysis results from gravity and response spectrum analysis, compare mode periods and effective mass with a Sap2000 model, and verify stiffness governs the natural period.

Define limit state groups for immediate occupancy, life safety, and collapse prevention in the analysis phase, and add deformation and drift criteria of 1% for columns, beams, and walls.

Review pushover analysis results by displaying the curve for pushover X and Y, plotting base shear versus roof drift, and inspecting limit state groups for life safety and collapse prevention.

Review time history results for dynamic performance assessment, using original and scaled earthquake records; analyze energy dissipation, deflected shapes, and roof displacement across two orthogonal components with plots and drifts.

Display hysteresis loops to assess nonlinear element behavior and plastic hinges beyond elastic range. Plot moment and shear diagrams for gravity loading, time history, envelopes, or single elements.

Determine the performance point by intersecting the capacity and demand curves from a static pushover analysis. Use a 0.45g response spectrum and FEMA 440 linearization to plot and save results.

Evaluate structural performance using usage ratio graphs of D/C ratios for columns, walls, and beams at immediate occupancy, with combinations of three earthquakes following ASCE-07 methods.

Celebrate completing this course on master CSI perform 3D for nonlinear structural analysis, and wish you all the best in your career, thank you for watching.