Structural Design Tall Building
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Master of Engineering Structural Design Project name ASPIRE hereafter, designed the gravity, lateral, and foundation systems, utilized finite element software for structural optimization, designed steel and concrete connections, and studied the effects of creep and shrinkage during a year-long analysis of the Chicago Spire.
Preliminary analysis included research of different lateral load resisting systems in order to select the system that would best suit the needs of the structure. The lateral system chosen was a central concrete core with outriggers and belt trusses connecting the core with the exterior steel columns.The gravity design of the structure explored the use of non-composite and composite beams and columns in the Spire. ASPIRE selected steel beams with a composite metal decking system. A column load take down based on tributary areas was used for the preliminary column design.
The Chicago Spire was modeled using MIDAS Gen, a structural finite element software, to accurately understand the lateral behavior of the building. A sensitivity analysis was performed to resize the concrete core, the outriggers, and the belt truss members from the initial hand calculation sizes.Core wall thicknesses were optimized across the height of the building. Vertical columns and transfer columns were redesigned as a series of steel built-up shapes through energy optimization methods.
The foundation system featured the design of a seven level below-grade parking garage and are training wall along the site perimeter. Rock-socketed caissons were designed to support the tower, extending from the base of the building to the bedrock 119 feet below grade.
There are hundreds of connections in the Chicago Spire ranging from standard steel connections to complex designs for the outriggers and the lobby level mega-columns. Several steel-to-steel and composite connections were designed throughout the tower.
A study of concrete creep and shrinkage estimated differential settlement between the concrete core and the exterior steel columns using the GL2000 model. Creep and shrinkage are dependenton variables such as loading schedule, curing period, and material properties, making it difficult to predict the actual amount of creep and shrinkage. However, failure to acknowledge these effects leads to cracks in the concrete and uneven floors.
Through the course of the project, ASPIRE faced many challenges that required the design team toseek guidance from outside sources, including weekly meetings with our faculty advisor and biweekly conference calls with our professional advisors from Thornton Tomasetti. The structuraldesign of the Chicago Spire was a collaborative effort of eighteen students and the advisors. The project provided a realistic design experience incorporating team management, iterative design,and professional reporting. For the final deliverable ASPIRE has prepared a cumulative design narrative, calculation book, and final structural drawing set.
1.0 Introduction
1.1 Chicago Spire: Background and Location
1.2 Project Scope
1.3 Design Process
2.0 Design Criteria
2.1 Tall Building Design
2.2 Lateral System Determination
2.3 Typical Floors and Column Layouts
2.4 Gravity Design Loads
2.5 Lateral Design Loads
2.6 Load Combinations
2.7 Serviceability Requirements
3.0 Gravity Design
3.1 Geometry and Loading
3.2 Core Slab Design
3.3 Link Beam Design
3.4 Composite Beam Design
3.5 Façade Beam Design
3.6 Column Design
4.0 Lateral Load Resisting System Design
4.1 Structural System Overview
4.2 Preliminary Core Wall Design
4.3 Auxiliary Lateral Systems
4.4 Finite Element Model
4.5 Core Wall Reinforcement Design
4.6 Energy Optimization
4.7 Eigenvalue Analysis
5.0 Steel and Concrete Detailing
5.1 Typical Connections
5.2 Complex Connections
6.0 Foundation Design and Detailing
6.1 Soil Properties
6.2 Retaining Wall Design
6.3 Parking Garage Slab Design
6.4 Bell Caisson Design
6.5 Rock-Socketed Caisson
7.0 Long-Term Deflection Effects
7.1 Conceptual Summary
7.2 Creep and Shrinkage Analysis
7.3 Conclusion and Recommendations
8.0 References
9.0 Appendix
9.1 Gravity Design Loads
9.2 RWDI Recommended Wind Load
9.3 Seismic Load Summary
9.4 Core Slab Design Summary
9.5 Link Beam Summary
9.6 Beam Spans and Tributary Areas
9.7 Slab and Decking Summary
9.8 Composite Beam Summary
9.9 Initial Gravity Design Column Comparison
9.10 MIDAS Gen Gravity Loads
9.11 Column Validation Summary
9.12 MIDAS Sensitivity Analyses
9.13 Core Wall Reinforcement
9.14 Creep and Shrinkage
10.0 Drawings
11.0 Calculations
Preliminary analysis included research of different lateral load resisting systems in order to select the system that would best suit the needs of the structure. The lateral system chosen was a central concrete core with outriggers and belt trusses connecting the core with the exterior steel columns.The gravity design of the structure explored the use of non-composite and composite beams and columns in the Spire. ASPIRE selected steel beams with a composite metal decking system. A column load take down based on tributary areas was used for the preliminary column design.
The Chicago Spire was modeled using MIDAS Gen, a structural finite element software, to accurately understand the lateral behavior of the building. A sensitivity analysis was performed to resize the concrete core, the outriggers, and the belt truss members from the initial hand calculation sizes.Core wall thicknesses were optimized across the height of the building. Vertical columns and transfer columns were redesigned as a series of steel built-up shapes through energy optimization methods.
The foundation system featured the design of a seven level below-grade parking garage and are training wall along the site perimeter. Rock-socketed caissons were designed to support the tower, extending from the base of the building to the bedrock 119 feet below grade.
There are hundreds of connections in the Chicago Spire ranging from standard steel connections to complex designs for the outriggers and the lobby level mega-columns. Several steel-to-steel and composite connections were designed throughout the tower.
A study of concrete creep and shrinkage estimated differential settlement between the concrete core and the exterior steel columns using the GL2000 model. Creep and shrinkage are dependenton variables such as loading schedule, curing period, and material properties, making it difficult to predict the actual amount of creep and shrinkage. However, failure to acknowledge these effects leads to cracks in the concrete and uneven floors.
Through the course of the project, ASPIRE faced many challenges that required the design team toseek guidance from outside sources, including weekly meetings with our faculty advisor and biweekly conference calls with our professional advisors from Thornton Tomasetti. The structuraldesign of the Chicago Spire was a collaborative effort of eighteen students and the advisors. The project provided a realistic design experience incorporating team management, iterative design,and professional reporting. For the final deliverable ASPIRE has prepared a cumulative design narrative, calculation book, and final structural drawing set.
1.0 Introduction
1.1 Chicago Spire: Background and Location
1.2 Project Scope
1.3 Design Process
2.0 Design Criteria
2.1 Tall Building Design
2.2 Lateral System Determination
2.3 Typical Floors and Column Layouts
2.4 Gravity Design Loads
2.5 Lateral Design Loads
2.6 Load Combinations
2.7 Serviceability Requirements
3.0 Gravity Design
3.1 Geometry and Loading
3.2 Core Slab Design
3.3 Link Beam Design
3.4 Composite Beam Design
3.5 Façade Beam Design
3.6 Column Design
4.0 Lateral Load Resisting System Design
4.1 Structural System Overview
4.2 Preliminary Core Wall Design
4.3 Auxiliary Lateral Systems
4.4 Finite Element Model
4.5 Core Wall Reinforcement Design
4.6 Energy Optimization
4.7 Eigenvalue Analysis
5.0 Steel and Concrete Detailing
5.1 Typical Connections
5.2 Complex Connections
6.0 Foundation Design and Detailing
6.1 Soil Properties
6.2 Retaining Wall Design
6.3 Parking Garage Slab Design
6.4 Bell Caisson Design
6.5 Rock-Socketed Caisson
7.0 Long-Term Deflection Effects
7.1 Conceptual Summary
7.2 Creep and Shrinkage Analysis
7.3 Conclusion and Recommendations
8.0 References
9.0 Appendix
9.1 Gravity Design Loads
9.2 RWDI Recommended Wind Load
9.3 Seismic Load Summary
9.4 Core Slab Design Summary
9.5 Link Beam Summary
9.6 Beam Spans and Tributary Areas
9.7 Slab and Decking Summary
9.8 Composite Beam Summary
9.9 Initial Gravity Design Column Comparison
9.10 MIDAS Gen Gravity Loads
9.11 Column Validation Summary
9.12 MIDAS Sensitivity Analyses
9.13 Core Wall Reinforcement
9.14 Creep and Shrinkage
10.0 Drawings
11.0 Calculations
Download
http://s18.alxa.net/s18/srvs2/02/003...cago.Spire.rar