AuroraB
Richter 7 or 8, if you're close to the epicenter it won't make any difference.Edit : The way to improve anti seismic resistance is to heavily increase the steel / concrete ratio.Steel being flexible where as concrete is not.When I see them using 8 or 10 mm round bar steel (not even R-bar) for the piles supporting 1st / 2nd floor or for foundation it make me smile.And the use of black (sea ?) sand sure doesn't improve the quality of the concrete....[/QUOTE]2005 Yogja and 2017 Lombok earthquakes were only 6.5 with thousand dead.A main issue here in Bali is use of heavy roof tiles. During an earthquake these heavy roof structures shake down the rest of the building. Lighter design like steel roof tiles would be far safer. Agree that steel framing would resist earthquake much better than (heavy) concrete. Again the execution is key to avoid that connections are failing before the column and beams sections themselves. I would probably rely on steel bracing located at strategic locations as unreinforced brick walls not tied in with columns and beams cannot be trusted during an earthquake.
Balifrog
2005 Yogja and 2017 Lombok earthquakes were only 6.5 with thousand dead.A main issue here in Bali is use of heavy roof tiles. During an earthquake these heavy roof structures shake down the rest of the building. Lighter design like steel roof tiles would be far safer.Agree that steel framing would resist earthquake much better than (heavy) concrete. Again the execution is key to avoid that connections are failing before the column and beams sections themselves. I would probably rely on steel bracing located at strategic locations as unreinforced brick walls not tied in with columns and beams cannot be trusted during an earthquake.[/QUOTE]I am speaking R-bar inside the concrete colums / foundation.
Markit
I am speaking R-bar inside the concrete colums / foundation.[/QUOTE]To be clear most of the dead in Lombok 2017 were due to shoddy and inept building styles. 10cm columns supporting brickwork with low class cement and usually also a second story. Here in east Bali we also got about 300 quakes and aftershocks but only a very few deaths, mainly due to falling trees/branches and some walls but among the villa builds most had some small structural damage such as cracked walls and loss of roof tiles. My bale begong lost some tiles and got a couple of cracks mainly because (as frog describes) the swaying of the unsupported structure during the long, but not very strong quake and heavily tiled roof caused the most damage. During the build of my house I insisted on considerably more rebar (steel reinforcing) than my Balinese architect and was the cause of much merriment amongst the building team. My house had zero cracks or damage, all others around a lot. Ha Ha (last laugh).
