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CCTV Headquarters: 234 m Continuous Loop Diagrid & Overhang
Two 6° leaning towers, 75 m cantilever bridge link at 162 m height, and stress-adaptive exterior steel diagrid.
Verify structural equilibrium, cantilever deflection, and modal frequency spectra of the leaning continuous loop under gravity and lateral seismic forces, proving the diagrid effectively channels the massive cantilever moment back into the foundation raft.
1. Geometry & FEA Mesh
- •Two towers leaning 6° inward toward each other from base footprints (40×40 m each) at opposite corners
- •Base podium building connecting both towers from ground z = 0 to 45 m
- •75 m L-shaped overhanging cantilever bridge link spanning between z = 162 m and 234 m, creating the central iconic window
- •Continuous exterior diagrid structural cage wrapping all four faces of both towers, podium, and overhang
- •Internal core columns and floor diaphragms transferring floor dead loads into the perimeter diagrid nodes
2. Loads & Boundary Conditions
- •Fixed 6-DOF boundary constraints across all base column and diagrid footings at z = 0
- •Full self-weight gravity generating high overturning moment across the 75 m cantilever
- •Beijing seismic and wind lateral design load along +X
3. Simulation Results & Findings
- ✓Static analysis demonstrates that the closed-loop diagrid converts overturning moments into pure axial tension and compression
- ✓Cantilever bridge vertical deflection stays strictly within allowable limits without excessive creep distortion
- ✓Fundamental modal frequencies show robust 3D structural stiffness despite extreme building asymmetry
Allows engineers to explore and verify highly irregular, non-vertical, and cantilevered monumental architecture in minutes without expensive proprietary licenses.
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