Final answer:
Modern skyscrapers are bolted together rather than riveted for faster construction, easier maintenance, cost-effectiveness, and structural flexibility.
Step-by-step explanation:
Modern skyscrapers are bolted together rather than riveted for several reasons. First, bolting allows for a faster construction process compared to riveting. Second, bolted connections provide easier disassembly and maintenance, as bolts can be easily removed and replaced when necessary. Third, bolted connections are more cost-effective and require less labor compared to riveted connections. Finally, bolting accommodates structural flexibility and reduces stress concentrations, allowing the building to withstand external forces and movements.