Prestressed Concrete Column and Steel Beam Junction
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Solution Overview
Problem
Existing junction structures between concrete columns and steel beams require increased beam height and weight to accommodate bending stress, leading to uneconomic and unreasonable designs, and pose challenges in effectively utilizing floor height due to exposed cogging and increased ceiling installation lines.
Innovation Solution
A column-beam junction structure using an H-section steel beam with a beam end block that allows for varying cross-sections, where the beam end block protrudes towards the column, and the space between the end plate and anchor plate is filled with a filler material, enabling flexible design and reduced dimensions of the beam end block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the beam height is increased to accommodate bending stress at beam end, then the flexural rigidity is improved, but the beam weight and cost increase
Solution Approach 1:
The patent applies local quality by increasing the beam height only at the beam end where bending stress occurs during earthquakes, while maintaining a smaller cross-section in the middle portion of the beam where bending stress is minimal. This is achieved through the beam end block (4) that protrudes toward the column, creating a localized reinforcement that improves flexural rigidity exactly where needed without unnecessarily increasing beam weight throughout its entire length.
2Reliability
If the cogging is exposed to provide structural function, then the jointing performance is improved, but the ceiling installation line is lowered
Solution Approach 1:
The patent applies the nesting principle by placing the cogging (2a) inside the beam end block (4), which protrudes toward the column. The cogging is nested within the structural assembly rather than being exposed, allowing the ceiling to be installed at a higher position while the cogging remains functional for seismic resistance. This nested configuration resolves the conflict between structural reliability and architectural height requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for an economic and reasonable structure with improved flexural rigidity, enabling higher ceiling installation lines and efficient use of floor height while reducing the beam end block dimensions and weight.
Implementation Method 1
A space between the end plate and the anchor plate is filled with a filler material, whereby bearing stress acting on the anchor plate is greatly reduced
Implementation Method 2
The PC tendon is tensioned and anchored to a surface of the anchor plate on a side opposite to the column to perform the integral jointing
Data Source
AI summary
A structure enables free and reasonable designing of a cross section of an end of a steel beam in accordance with bending stress and a housed state of a PC steel, thereby providing an economic and reasonable building as a whole. A beam end block includes end plates and an anchor plate. The end plates are fixed at an end surface of an H-section steel in a direction substantially perpendicular to the longitudinal direction of the beam. The anchor plate is fixed to the H-section steel separately from the end plates, on a side opposite to a column, in a direction substantially perpendicular to the longitudinal direction of the beam. An end of the steel beam has an upper part and a lower part. The upper part protrudes toward the column more than the lower part and is mounted on a cogging. The beam end block has a height dimension larger than the height dimension of the H-section steel and has a lower end that is disposed at substantially the same height as a lower end of a side surface of the cogging facing the lower part of the end of the steel beam.