RPA99v2003 | \matrix{ {{{{S_a}} \over g} = 1,25.A.\left\lfloor {1 + {T \over {{T_1}}}\left( {2.5\eta {Q \over R} - 1} \right)} \right\rfloor } \hfill & {\left( {{T_1} = {T_B}} \right)} \hfill \cr } | \eqalign{ & \matrix{ {{{{S_a}} \over g} = 1,25.A.2,5.\eta .\left( {{Q \over R}} \right)} \hfill & {\left( {{T_1} \le T \le {T_2}} \right)} \hfill \cr } \cr & \cr} | \matrix{ {{{{S_a}} \over g} = 1,25.A.2,5.\eta .\left( {{Q \over R}} \right){{\left( {{{{T_2}} \over T}} \right)}^{2/3}}} \hfill & {\left( {{T_2} \le T \le {T_3}} \right)} \hfill \cr } | V = {{A.D.Q} \over R}.W\left\{ {\matrix{ {A:{\rm{area}}\,{\rm{acceleration}}\,{\rm{coefficient}},} \hfill \cr {D:{\rm{average}}\,{\rm{dynamic}}\,{\rm{amplification}}\,{\rm{factor}}} \hfill \cr {{\rm{Q}}:{\rm{quality}}\,{\rm{factor}}} \hfill \cr {{\rm{R}}:{\rm{overall}}\,{\rm{behavior}}\,{\rm{coefficient}}\,{\rm{of}}\,{\rm{the}}\,{\rm{structure}}} \hfill \cr {{\rm{W}}:\,{\rm{The}}\,{\rm{effective}}\,{\rm{seismic}}\,{\rm{weight}}\,{\rm{of}}\,{\rm{the}}\,{\rm{structure}}} \hfill \cr } } \right. |
\matrix{ {{{{S_a}} \over g} = 1,25.A.2,5.\eta .\left( {{Q \over R}} \right){{\left( {{{{T_2}} \over 3}} \right)}^{2/3}}{{\left( {{T \over 3}} \right)}^{5/3}}} \hfill & {\left( {{T_2} \le T \le {T_3}} \right)} \hfill \cr } |
EC8-2004 | {S_e} = {a_g}.S.\left\lfloor {1 + {T \over {{T_B}}}\left( {\eta 2.5 - 1} \right)} \right\rfloor | Se=2.5.ag.S.η | {T_C} \le T \le {T_D} \to {S_e} = 2.5.{a_g}.S.\eta .\left[ {{{{T_C}} \over T}} \right] | {F_b} = {S_d}\left( T \right){W \over g}.\lambda \left\{ {\matrix{ {\lambda = 0.85\,\,\,if\,\,\,{T_1} \le 2{T_C}} \hfill & {or} \hfill \cr {\lambda = 1.00\,otherwise} \hfill & {} \hfill \cr } } \right. |
{S_d} = {a_g}.S.\left[ {{2 \over 3} + {T \over {{T_B}}}\left( {{{2.5} \over q} - {2 \over 3}} \right)} \right] | Sd = 2.5.ag.S.η | {T_C} \le T \le {T_D} \to {S_d}\left\{ {\matrix{ { = {{2.5} \over q}.{a_g}.S.\left[ {{{{T_C}} \over T}} \right]} \cr { \ge \beta .{a_g}} \cr } } \right. |
| | {T_D} \le T \le 4s \to {S_e} = 2.5.{a_g}.S.\eta .\left\lfloor {{{{T_C}{T_D}} \over {{T^2}}}} \right\rfloor |
T \ge {T_D} \to {S_d} = {{2.5} \over q}.{a_g}.S.\left\lfloor {{{{T_C}{T_D}} \over {{T^2}}}} \right\rfloor \ge \beta .{a_g} |
IBC-2015 | \matrix{ {{{{S_a}} \over g} = 1 + 15T} & {\left( {0.00 \le T \le 0.10} \right)} \cr } | Sa = SDS (T0≤T≤TS) | \matrix{ {{S_a} = {{{S_{DS}}} \over T}} & {\left( {T > {T_s}} \right)} \cr } | V = {C_s}.W\left\{ {\matrix{ {{C_s}:{\rm{The}}\,{\rm{seismic}}\,{\rm{response}}\,{\rm{coefficient}}} \hfill \cr {{\rm{W:}}\,{\rm{The}}\,{\rm{effective}}\,{\rm{seismic}}\,{\rm{weight}}\,{\rm{of}}\,{\rm{the}}\,{\rm{structure}}} \hfill \cr } } \right. |
IS-1893-2002 | \matrix{ {{{{S_a}} \over g} = 1 + 15T} & {\left( {0.00 \le T \le 0.10} \right)} \cr } | \matrix{ {{{{S_a}} \over g} = 2.50} & {\left( {0.10 \le T \le 0.40} \right)} \cr } | \matrix{ {{{{S_a}} \over g} = 1.00/T} & {\left( {0.40 \le T \le 4.00} \right)} \cr } | V = {{Z.I.{S_a}} \over {2.R.g}}.W\left\{ {\matrix{ {{\rm{Z:zone}}\,{\rm{factor}}} \hfill \cr {{\rm{I:importance}}\,{\rm{factor}}} \hfill \cr {{{\rm{S}}_{\rm{a}}}{\rm{:average}}\,{\rm{response}}\,{\rm{acceleration}}\,{\rm{coefficient}}} \hfill \cr {{\rm{R:}}\,{\rm{response}}\,{\rm{reduction}}\,{\rm{factor}}} \hfill \cr {{\rm{g:acceleration}}\,{\rm{due}}\,{\rm{to}}\,{\rm{gravity}}} \hfill \cr {{\rm{W}}:{\rm{Seismic}}\,{\rm{weight}}\,{\rm{of}}\,{\rm{the}}\,{\rm{structure}}} \hfill \cr } } \right. |