# Changes for page Seismic analysis

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edited by IwonaBudny
on 2018/09/06 15:18
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edited by IwonaBudny
on 2018/09/06 15:20
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 ... ... @@ -264,11 +264,40 @@ 264 264 265 265 == Displacement calculation == 266 266 267 +(% style="text-align: justify;" %) 268 +The displacement calculation is made according to EC8 4.3.4 using the following formula: 269 + 270 +(% style="text-align: justify;" %) 271 +(% class="mark" %)d,,s ,,= q,,d,, d,,e,, 272 + 273 +(% style="text-align: justify;" %) 274 +where: 275 + 276 +* d,,s,, is the displacement of a point of the structural system induced by the design seismic action, 277 +* qd is the displacement behavior factor, assumed equal to q unless otherwise specified, 278 +* d,,e,, is the displacement of the same point of the structural system, as determined by a linear analysis based on the design response spec- trum. 279 + 280 +(% style="text-align: justify;" %) 281 +FEM-Design uses the above formula only to calculate the summarized and combined the so called final results displacements. The displacements obtained from the single shapes and torsional effects won’t be modified. 282 + 267 267 ---- 268 268 269 269 = **The results of seismic calculation** = 270 270 287 +(% style="text-align: justify;" %) 288 +The seismic results are very similar to statical results with some more items as follow: equivalent seismic forces and base shear force. The results shown separately from mode shapes, torsional effects, sum of the directions (Sum, x'…) and the final results (Seismic max.). 271 271 290 +(% style="text-align: justify;" %) 291 +Desired results can be selected from the result dialog as it is shown below. Among the equivalent load results not only the nodal forces can be seen but also the base shear force, and in case of torsional effect the total torsional moment as well. 292 + 293 +(% style="text-align: justify;" %) 294 +[[image:1536239899693-361.png||height="181" width="272"]] 295 + 296 +(% class="box warningmessage" style="text-align: justify;" %) 297 +((( 298 +Because of the summation rule, the summarized values by direction and the full combinations give only positive values, namely these results means the maximum envelope. Because of the summation rule, none of the displacement components in a node and none of the member’s internal forces are not simultaneous. 299 +))) 300 + 272 272 ---- 273 273 274 274 = **Summation of static and seismic effects** =