A theoretical calculation method of seismic shear key pounding based on continuum model

Area of Science:

• Structural Engineering
• Seismic Analysis
• Bridge Dynamics

Background:

• Shear key design for bridges is critical for seismic resistance.
• Current design relies heavily on costly experiments and empirical methods.
• A theoretical approach is needed to improve seismic performance analysis.

Purpose of the Study:

• To develop a novel theoretical model for shear key seismic performance.
• To provide an analytical method for assessing pounding responses.
• To enhance the reliability of seismic limiting devices in bridges.

Main Methods:

• Developed a "Beam-Spring-Beam + Concentrated Mass" continuum dynamic model.
• Applied transient wave function expansion and mode superposition methods.
• Utilized transient internal force and Duhamel integration methods for elastic pounding analysis.

Main Results:

• Established a feasible continuum model for girder and pier systems.
• Derived analytical solutions for dynamic responses under seismic excitation.
• Simulated pounding processes using embedded elastic pounding calculation methods.

Conclusions:

• The proposed theoretical method offers a viable alternative to experimental approaches.
• This research provides a foundation for optimizing shear key design.
• The study enhances the reliability of seismic limiting devices for bridges.