Inverted Beam Concrete Assembly with Nested Legs
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Solution Overview
Problem
Current concrete building element assemblies face challenges in structural strength, appearance, versatility, and practical difficulty in connecting structural elements, with room for improvement in these aspects.
Innovation Solution
The assembly includes a configuration of concrete lower columns, column capitals, and an inverted beam with a flat upper surface and downward projecting legs, featuring hook bars for connection, and a method of attaching a rigid panel to the beam's leg before pouring concrete into the column capitals, which is later removed after curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional concrete structural elements are used with conventional connection methods, then the construction process is straightforward, but the structural strength and connection reliability are insufficient
Solution Approach 1:
The beam is segmented into an inverted portion and a regular portion, with the inverted portion containing downward projecting legs that fit into recesses in the column capitals. This segmentation allows for modular assembly while maintaining structural integrity through the interlocking geometry of the segments.
Solution Approach 2:
The downward projecting legs of the inverted beam are nested into recesses formed in the column capitals, creating a nested configuration where the beam portion is received within the column capital structure. This nesting provides mechanical interlocking and enhances connection reliability without requiring additional fasteners.
2Productivity
If precast concrete elements are used for efficient construction, then productivity increases, but the versatility and adaptability of the structural system are limited
Solution Approach 1:
The inverted beam design serves multiple functions: it provides structural load-bearing capacity, creates mechanical connection through nested legs, enables alignment through flat surfaces, and allows for integration of reinforcement. This multi-functionality in a single element design enhances versatility while maintaining precast construction efficiency.
Solution Approach 2:
The beam is inverted with its supporting legs projecting downward instead of upward, allowing it to rest on and connect to the column capitals in a novel configuration. This inversion enables the beam to be positioned before the column capitals are fully constructed, providing construction flexibility and adaptability.
3Reliability
If conventional beam configurations are used, then the design is simple, but the energy dissipation capacity and structural stability are insufficient
Solution Approach 1:
The beam configuration transitions from a conventional horizontal element to an inverted L-shaped or U-shaped element with vertical legs extending downward. This dimensional change from a simple beam to a three-dimensional inverted structure with multiple surfaces and legs enhances the beam's ability to connect with column capitals and dissipate energy through multiple load paths.
Solution Approach 2:
The inverted beam integrates concrete structure with embedded steel reinforcement bars (rebar) that extend into the column capitals. This composite construction combines the compressive strength of concrete with the tensile strength of steel, creating a more reliable and stable structural connection with enhanced energy dissipation capacity.
Data Source
AI summary
An assembly of concrete structural elements includes a first and a second concrete lower column, and a first and a second column capitals are supported on respective upper ends of the respective first and second lower columns. At least one inverted beam is extended between the first and second column capitals. At least one lower flat surface of the inverted beam is positioned on respective edges of the first and second column capitals.