https://communities.bentley.com/communities/other_communities/chinafirst/w/chinawiki/51061/effective-perioden-USTelligent Community 12https://communities.bentley.com/communities/other_communities/chinafirst/w/chinawiki/51061/effective-periodFri, 21 Aug 2020 03:09:07 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:17e79873-29ad-476f-88db-595afe454d4aQiang Hehttps://communities.bentley.com/communities/other_communities/chinafirst/w/chinawiki/51061/effective-period#commentsCurrent Revision posted to 技术资料库 by Qiang He on 8/21/2020 3:09:07 AM<br /> <p>在冰激振动疲劳分析中，程序通过能够产生最大响应的模式(基底剪力或者翻转力矩，大量试算表明，基本都是通过基底剪力来判断冰激振动的effective period)来考虑荷载的循环次数。</p> <p><img src="/resized-image/__size/640x480/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1597979232690v1.png" alt=" " /></p> <p>以基础剪力作用为例说明：</p> <p>后半段试算时间内获得平均基底剪力为245.85</p> <p><img src="/resized-image/__size/640x480/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1597979272252v2.png" alt=" " /></p> <p>后半段试算时间30秒内平均基底剪力245.85穿过基底剪力时程曲线8次，所以冰激振动有效周期为30/（0.5*8）=7.5秒</p> <p><img src="/resized-image/__size/640x480/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1597979299104v3.png" alt=" " /></p> <p>一个观测期（在本示例中，FTOPT卡中设置为1年）内观测到该冰况持续存在时间为0.5小时，所以在一个观测期内，该冰况产生的应力循环次数为0.5*3600/该冰况有效周期=1800/7.5=240次，即根据本例，FTLOAD 1的次数为240次。</p> <p><img src="/resized-image/__size/640x480/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1597979327306v4.png" alt=" " /></p> <p>一个观测期内该冰况持续存在时间为0.5小时</p> <p><img src="/resized-image/__size/640x480/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1597979356027v5.png" alt=" " /></p> <p>在疲劳FTOPT卡中，观测期为1年</p> <p><img src="/resized-image/__size/640x480/__key/communityserver-wikis-components-files/00-00-00-04-10/pastedimage1597979379387v6.png" alt=" " /></p><div style="clear:both;"></div>