Budis, your comment is very right actually that's what i want to pointed out that ductility is not related just only to earthquake design, it is properties of structure we can employ to get a robust structure even in low seismic area so why not use it, it provides you margin of safety against possible relatively excessive settlement and overall it provides you eventually stronger structure against possible overloads.
However regarding the economic, i just curious do both of you think that OMF in low seismic area will be more economic than IMF or SMF??I just have impression that it will not in case of semi highrise or highrise building. But perhaps yes if it is lowrise building, but i'm not sure. Do u have document that help you with your statement? because if it is, this is good for my business, at least do OMF with less confinement required from SMF/IMF :P.
Parhyang, u must understand that the seismic map is made from PSHA. U must know that the source of earthquake recorded is scarce, and in just this recent years that more develop and even online technology of recorded earthquake acceleration is available. From the source data, the attenuation relationship and probability model, the earthquake acceleration is "heavily probabilistic". Who will think of more than 7.5 or 8 magnitude will happen before 2004. So the 2002 version from SNI 1726, the 2008 version from SNI 2833 and the latest one the 2010 is in many place is significantly different, thinking that building lifespan is 50 years or more, we don't know what we will face ahead. So my opinion that seismic map is evolved, place that have been considered less risk can be change into medium risk (Singapore for example). Of course it is earthquake engineering problem and not structural problem because guess what?? we have ductility. Pls help me also with other definition of economic besides cost or money? and why do u think material consumption is not money or cost?
Budis i believe you already know that the indonesian code will be similar with asce 7 2010. From some engineers that i know who have been comparing the 2002 version and the new one, Jakarta will not affected very much, hopefully. West of sumatera, south of java and east indonesia is the most affected one. In one seminar they say that seismic map of east part of indonesia is extrapolated due to limited seismic source before 2000, though from geological perspectives shows a possible major earthquake might happen there. If i'm not mistaken, the east part of Indonesia is shifting north. Due to the limited data, they are quite conservative for the east of Indonesia at the moment. One thing they say again that there is a possible unidentified fault line beneath Jakarta if it looks from the map of fault lines. Just hope it will never come true, otherwise God knows :D.
However regarding the economic, i just curious do both of you think that OMF in low seismic area will be more economic than IMF or SMF??I just have impression that it will not in case of semi highrise or highrise building. But perhaps yes if it is lowrise building, but i'm not sure. Do u have document that help you with your statement? because if it is, this is good for my business, at least do OMF with less confinement required from SMF/IMF :P.
Parhyang, u must understand that the seismic map is made from PSHA. U must know that the source of earthquake recorded is scarce, and in just this recent years that more develop and even online technology of recorded earthquake acceleration is available. From the source data, the attenuation relationship and probability model, the earthquake acceleration is "heavily probabilistic". Who will think of more than 7.5 or 8 magnitude will happen before 2004. So the 2002 version from SNI 1726, the 2008 version from SNI 2833 and the latest one the 2010 is in many place is significantly different, thinking that building lifespan is 50 years or more, we don't know what we will face ahead. So my opinion that seismic map is evolved, place that have been considered less risk can be change into medium risk (Singapore for example). Of course it is earthquake engineering problem and not structural problem because guess what?? we have ductility. Pls help me also with other definition of economic besides cost or money? and why do u think material consumption is not money or cost?
Budis i believe you already know that the indonesian code will be similar with asce 7 2010. From some engineers that i know who have been comparing the 2002 version and the new one, Jakarta will not affected very much, hopefully. West of sumatera, south of java and east indonesia is the most affected one. In one seminar they say that seismic map of east part of indonesia is extrapolated due to limited seismic source before 2000, though from geological perspectives shows a possible major earthquake might happen there. If i'm not mistaken, the east part of Indonesia is shifting north. Due to the limited data, they are quite conservative for the east of Indonesia at the moment. One thing they say again that there is a possible unidentified fault line beneath Jakarta if it looks from the map of fault lines. Just hope it will never come true, otherwise God knows :D.