https://communities.bentley.com/communities/other_communities/chinafirst/w/chinawiki/42556/fraction-of-lifeen-USTelligent Community 12https://communities.bentley.com/communities/other_communities/chinafirst/w/chinawiki/42556/fraction-of-lifeTue, 11 Jun 2019 01:40:48 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:218b0205-683a-4241-9e03-c662f50d459aQiang Hehttps://communities.bentley.com/communities/other_communities/chinafirst/w/chinawiki/42556/fraction-of-life#commentsCurrent Revision posted to 技术资料库 by Qiang He on 6/11/2019 1:40:48 AM<br /> <ol> <li>通过scatter diagram考虑波浪谱疲劳荷载输入时，在FTCASE 和 SCATD中都有fraction of life，SCATD中fraction of life输入值（0.01 或者0.001）将作为系数与波浪散布图中frequency of occurrence值相乘得到一个波浪情况在一个观测期内的时间占比，最后整个波浪散布图所有波浪情况的施加占比相加得到一个总的时间占比值，该总咱比值将会与FTCASE中fraction of life相乘得到对应工况的时间占比值。(参照图一到图四)</li> <li>在SCATD中可以通过激活标准化（Scatter Diag. Normalized选项）（这个时候SCATD中fraction of life必须留空），程序在计算时，会自动将波浪散布图中各个值除以各个值相加之和，即转化为分数，最后总和为1。这种条件下，FTCASE中输入的fraction of life值为该工况的时间占比值。（参照图五到图六）</li> <li>通过&rsquo;WSPEC&rsquo;考虑谱疲劳波浪输入时，FTCASE中的fraction of life值将与WSPEC中对应fraction of design life相乘得到各个波浪谱的时间占比，参与疲劳分析。（参照图八）这种输入方式与通过波浪散布图的方式输入在效果上是等效的。 <p>图一：FTCASE 考虑fraction of life值0.5</p> <img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560216854668v1.png" /> <p>图二：SCATD中考虑fraction of life值0.01，即将波浪散布图中所有数值考虑为百分数</p> <img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560216895987v2.png" /> <p>图三：波浪散布图中总的frequency of occurrence 为200</p> <img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560216923815v3.png" /> <p>图四：该例子中List文件中对scatter diagram的处理结果为2， 与FTCASE中0.5 相乘得TOTAL LIFE RATIO 1.0</p> <img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560216961607v4.png" /><img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560216977300v5.png" /> <p>图五：将SCATD中fraction of life留空，激活Scatter Diag. Normalized选项</p> <img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560217021798v6.png" /> <p>图六：FTCASE中fraction of life 值0.5即为该工况的TOTAL LIFE RATIO。</p> <img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560217051958v7.png" /><img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560217067759v8.png" /> <p>图七：SCATD中的标准化选项（normalized选项）和fraction of life选项不能同时存在（摘自手册命令），否则都存在时，所设fraction of life将与FTCASE中的fraction of life值相乘作为最终计算的total life ratio。</p> <img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560217098434v9.png" /> <p>图八：通过&rsquo;WSPEC&rsquo;考虑谱疲劳波浪输入时，对各个波浪谱的时间占比的考虑。</p> <img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560217137746v10.png" /></li> </ol><div style="clear:both;"></div> https://communities.bentley.com/communities/other_communities/chinafirst/w/chinawiki/42556/fraction-of-life/revision/1Tue, 11 Jun 2019 01:39:32 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:218b0205-683a-4241-9e03-c662f50d459aQiang Hehttps://communities.bentley.com/communities/other_communities/chinafirst/w/chinawiki/42556/fraction-of-life#commentsRevision 1 posted to 技术资料库 by Qiang He on 6/11/2019 1:39:32 AM<br /> <ol> <li>通过scatter diagram考虑波浪谱疲劳荷载输入时，在FTCASE 和 SCATD中都有fraction of life，SCATD中fraction of life输入值（0.01 或者0.001）将作为系数与波浪散布图中frequency of occurrence值相乘得到一个波浪情况在一个观测期内的时间占比，最后整个波浪散布图所有波浪情况的施加占比相加得到一个总的时间占比值，该总咱比值将会与FTCASE中fraction of life相乘得到对应工况的时间占比值。(参照图一到图四)</li> <li>在SCATD中可以通过激活标准化（Scatter Diag. Normalized选项）（这个时候SCATD中fraction of life必须留空），程序在计算时，会自动将波浪散布图中各个值除以各个值相加之和，即转化为分数，最后总和为1。这种条件下，FTCASE中输入的fraction of life值为该工况的时间占比值。（参照图五到图六）</li> <li>通过&rsquo;WSPEC&rsquo;考虑谱疲劳波浪输入时，FTCASE中的fraction of life值将与WSPEC中对应fraction of design life相乘得到各个波浪谱的时间占比，参与疲劳分析。（参照图八）这种输入方式与通过波浪散布图的方式输入在效果上是等效的。 <p>图一：FTCASE 考虑fraction of life值0.5</p> <img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560216854668v1.png" alt=" " /> <p>图二：SCATD中考虑fraction of life值0.01，即将波浪散布图中所有数值考虑为百分数</p> <img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560216895987v2.png" alt=" " /> <p>图三：波浪散布图中总的frequency of occurrence 为200</p> <img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560216923815v3.png" alt=" " /> <p>图四：该例子中List文件中对scatter diagram的处理结果为2， 与FTCASE中0.5 相乘得TOTAL LIFE RATIO 1.0</p> <img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560216961607v4.png" alt=" " /><img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560216977300v5.png" alt=" " /> <p>图五：将SCATD中fraction of life留空，激活Scatter Diag. Normalized选项</p> <img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560217021798v6.png" alt=" " /> <p>图六：FTCASE中fraction of life 值0.5即为该工况的TOTAL LIFE RATIO。</p> <img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560217051958v7.png" alt=" " /><img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560217067759v8.png" alt=" " /> <p>图七：SCATD中的标准化选项（normalized选项）和fraction of life选项不能同时存在（摘自手册命令），否则都存在时，所设fraction of life将与FTCASE中的fraction of life值相乘作为最终计算的total life ratio。</p> <img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560217098434v9.png" alt=" " /> <p>图八：通过&rsquo;WSPEC&rsquo;考虑谱疲劳波浪输入时，对各个波浪谱的时间占比的考虑。</p> <img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1560217137746v10.png" alt=" " /></li> </ol><div style="clear:both;"></div>