Structural Behavior of Semi-Rigid Joint Systems
Summary
The structural behaviour of semi-rigid joint systems is characterised by connections that offer intermediate rotational restraint between fully pinned and fully rigid conditions. Such joints are found in steel and timber frames, lattice shells and hybrid structures, where they influence load distribution, stiffness, stability and energy dissipation. The moment-rotation relationship of a semi-rigid joint departs from the idealised hinge and fixed-end regimes, introducing nonlinearity that must be captured in design models to predict global responses accurately. Experimental testing, finite-element simulation and analytical formulations have advanced our understanding of how joint geometry, fastener properties, material nonlinearity and boundary conditions interact to govern system performance. Semi-rigid joints allow for more economical and resilient designs by reducing peak moment demands in members, accommodating deformations under service and ultimate loadings, and providing controlled energy dissipation in seismic events. From long-span gridshells to modular space frames, the optimisation of joint stiffness and strength has become central to innovative lightweight and sustainable structural solutions worldwide.
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Structural Behavior of Semi-Rigid Joint Systems publication trend
The graph below shows the total number of articles in structural behavior of semi-rigid joint systems across all publications each year (not limited to Nature Index journals).
Technical terms
Semi-rigid joint: A structural connection offering partial rotational restraint, intermediate between hinge and fixed conditions.
Rotational stiffness: The resistance of a joint to rotation under applied moment, typically expressed as moment per unit rotation.
Moment-rotation curve: A graphical representation of joint behaviour showing the relationship between applied bending moment and resulting rotation.
MERO joint: A prefabricated double-layer ball joint system commonly used in space frames, named after its manufacturer, comprising spherical nodes and tubular members.
References
- Rotational Stiffness Investigation and Parametric Analysis of a Novel Assembled Joint in Lattice Shells. Buildings (2024).
- Investigating the Effect of Screw Size on the Stress Level in MERO Joint for Space Frame Structures. Applied System Innovation (2021).
- Analysis of factors affecting the stability of large-span cable-braced timber gridshells. Developments in the Built Environment (2024).
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