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background-color: transparent;"><span class="2"><span style="font-family: SimSun;">2.4.4</span></span></st1:chsdate><span class="2" style="line-height: 12pt; background-color: transparent;">床身与立柱结合面刚度计算</span></p> <div class="Section1"> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:27.0pt; line-height:20.9pt;mso-line-height-rule:exactly;background:transparent"><span class="2">假设立柱与床身构成的结合面为理想结合面，即假定结合面之间的接触压力在整 个结合面上为常数，结合面上各点均勻接触，并在所有的接触点上具有相同的力学性 质。使用吉村允孝法计算床身与立柱间结合面的等效刚度。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:27.0pt; line-height:20.9pt;mso-line-height-rule:exactly;background:transparent"><span class="2">结合面接触压力来源于立柱自身的重力和13个连接螺栓的预紧力。预紧力的大小 根据螺栓组的受力大小和连接要求决定。螺栓设计的原则是应保证所需预紧力，又不 应使连接的结构尺寸过大。通常规定拧紧后螺栓预紧应力不大于其材料屈服点</span><span class="211pt"><span lang="EN-US" style="font-size: 11pt;">CT</span></span><span class="2"><span style="font-family: SimSun;">,</span></span><span class="2">的 80%，对一般连接用碳素钢螺栓预紧力推荐值为<sup>[29]</sup>:</span></p> </div> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:15.3pt; margin-left:0cm;text-indent:27.0pt;line-height:20.9pt;mso-line-height-rule: exactly;background:transparent"><span class="2">由于肌尼对结构校态频率和振型影响较小，可忽略。因此，在模态分析吋，不设 筲连接阻尼<sup>1281</sup>*立往方案1与方案2的重置差距较小，由式</span><span class="2"><span style="font-family: SimSun;">(2.10)</span></span><span class="2">可知，两个方案的重 傲差对平均接触</span><span class="211pt8"><span lang="EN-US" style="font-size: 11pt;">Hi</span></span><span class="2">力</span><span class="211pt8"><span lang="EN-US" style="font-size: 11pt;">P</span></span><span class="2">的影响</span><span class="211pt7"><span lang="EN-US" style="font-size: 11pt;">m</span></span><span class="2">丨忽略，因此，立柱方案2与床身的连接可使川相同的 结合而特性参数进行逑模。</span></p> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:15.3pt; margin-left:0cm;text-indent:27.0pt;line-height:20.9pt;mso-line-height-rule: exactly;background:transparent"> </p> <p 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.btn-qq{background:url(/template/CmsEasy_V_408/skin/images/servers/metro_color/r_qq.png) 0px 0px no-repeat; background-color:#6da9de;color:#FFF;} .izl-rmenu .btn-qq:hover{background-color:#488bc7;color:#FFF;} .izl-rmenu .btn-qq .qq{background-color:#488bc7; position:absolute; width:160px; left:-160px; top:0px; line-height:73px; color:#FFF; font-size:18px; text-align:center; display:none;} .izl-rmenu .btn-qq a {color:#FFF;font-size:14px;} .izl-rmenu .btn-wx{background:url(/template/CmsEasy_V_408/skin/images/servers/metro_color/r_wx.png) 0px 0px no-repeat; background-color:#78c340;} .izl-rmenu .btn-wx:hover{background-color:#58a81c;} .izl-rmenu .btn-wx .pic{position:absolute; left:-160px; top:0px; display:none;width:140px;height:140px; max-width: 200%;} .izl-rmenu .btn-phone{background:url(/template/CmsEasy_V_408/skin/images/servers/metro_color/r_phone.png) 0px 0px no-repeat; background-color:#fbb01f;} .izl-rmenu .btn-phone:hover{background-color:#ff811b;} .izl-rmenu .btn-phone .phone{background-color:#ff811b; position:absolute; width:160px; left:-160px; top:0px; line-height:73px; color:#FFF; font-size:18px; text-align:center; display:none;} .izl-rmenu .btn-ali{background:url(/template/CmsEasy_V_408/skin/images/servers/metro_color/r_ali.png) 0px 0px no-repeat; background-color:#B8860B;} .izl-rmenu .btn-ali:hover{background-color:#808000;} .izl-rmenu a.btn-ali,.izl-rmenu a.btn-ali:visited{background:url(/template/CmsEasy_V_408/skin/images/servers/metro_color/r_ali.png) 0px 0px no-repeat; background-color:#B8860B; text-decoration:none; display:block;} .izl-rmenu .btn-wangwang{background:url(/template/CmsEasy_V_408/skin/images/servers/metro_color/r_wangwang.png) 0px 0px no-repeat; background-color:#FFD700;} .izl-rmenu .btn-wangwang:hover{background-color:#DAA520;} .izl-rmenu a.btn-wangwang,.izl-rmenu a.btn-wangwang:visited{background:url(/template/CmsEasy_V_408/skin/images/servers/metro_color/r_wangwang.png) 0px 0px no-repeat; background-color:#FFD700; text-decoration:none; display:block;} .izl-rmenu .btn-skype{background:url(/template/CmsEasy_V_408/skin/images/servers/metro_color/r_skype.png) 0px 0px no-repeat; background-color:#FF69B4;} .izl-rmenu .btn-skype:hover{background-color:#8B008B;} .izl-rmenu a.btn-skype,.izl-rmenu a.btn-skype:visited{background:url(/template/CmsEasy_V_408/skin/images/servers/metro_color/r_skype.png) 0px 0px no-repeat; background-color:#FF69B4; text-decoration:none; display:block;} .izl-rmenu .btn-web{background:url(/template/CmsEasy_V_408/skin/images/servers/metro_color/r_web.png) 0px 0px no-repeat; background-color:#008a46;} .izl-rmenu .btn-web:hover{background-color:#00663a;} .izl-rmenu a.btn-web,.izl-rmenu a.btn-web:visited{background:url(/template/CmsEasy_V_408/skin/images/servers/metro_color/r_web.png) 0px 0px no-repeat; background-color:#008a46; text-decoration:none; display:block;} .izl-rmenu .btn-top{background:url(/template/CmsEasy_V_408/skin/images/servers/metro_color/r_top.png) 0px 0px 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