A magnitude 8.1 earthquake occurred in the waters south of Alaska, USA, with a focal depth of 10 kilometers. The epicenter was located at 55.40 degrees north latitude and 158.00 degrees west longitude. The average elevation within 5 kilometers of the epicenter is about -90 meters. A total of 10 earthquakes of magnitude 3 or higher occurred within 200 kilometers of the epicenter in the past 5 years. The largest earthquake was this one. The historical earthquake distribution is shown in the figure.

What are the commonly used seismic reinforcement methods?

Change the force system reinforcement method

Paste FRP composite method

Increase section method

External steel reinforcement method

Externally prestressed reinforcement method

Bonded steel reinforcement method