1. Conventional precast assembly 2. Experimental investigation of precast concrete and precast steel-concrete composite frames having novel mechanical joints 3. The investigation of the structural performance of the hybrid composite precast frames with mechanical joints based on nonlinear finite element analysis 4. L-type hybrid precast frames with mechanical joints using laminated metal plates 5. Novel erection of precast frames using interlocking mechanical couplers 6. Novel precast frame for facile construction of low-rise buildings using mechanically assembled joint to replace conventional monolithic concrete frame 7. Novel pipe rack frames with rigid joints 8. Application to modular construction 9. Precast steel-concrete composite structural frames with monolithic joints 10. Artificial-intelligence-based design of ductile precast concrete beams