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0px">木屋架按下弦所用材料分為木屋架和鋼木屋架。木屋架的形式主要有三角形、梯形和多邊形<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">(</span>見桁架<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">)</span>。屋架形式的選擇除考慮用料是否節省外，尚應依據屋面的流水坡度。粘土平瓦、水泥平瓦或小青瓦要求較大的坡度<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">,</span>需選用三角形屋架<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">;</span>石棉水泥瓦要求的坡度較緩可選用梯形層架；卷材或鐵皮屋面宜選用梯形或多邊形屋架。為使木屋架在荷載長期作用下不產生明顯的撓度，應在制作時預起拱度。<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US"></span></span></span></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">木屋架</span></span></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">用原木或方木制作的豪式桁架多用齒連接。由于齒連接只能傳遞壓力，因此三角形屋架的斜腹桿從支座到跨中應向下傾斜；梯形屋架的斜腹桿一般應向上傾斜，但在中部節間尚應設置反向斜桿，因為在不同的荷載組合下，反向斜桿可能受壓。受拉豎桿用圓鋼，以便拼裝時擰緊螺帽，消除節點處手工操作的偏差，并用以預起拱度。當屋架的內力較大，支座節點采用齒連接不足以傳遞內力時，應加強支座節點。近年來，采用齒板連接的木屋架（圖<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">1</span>）<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">,</span>效果較好。<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US"></span></span></span></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"> </p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US"><a style="PADDING-BOTTOM: 0px; MARGIN: 0px; OUTLINE-STYLE: none; OUTLINE-COLOR: invert; PADDING-LEFT: 0px; OUTLINE-WIDTH: medium; PADDING-RIGHT: 0px; COLOR: rgb(51,51,51); TEXT-DECORATION: none; PADDING-TOP: 0px" title="" ><span style="color:#00cc;PADDING-BOTTOM: 0px; MARGIN: 0px; 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style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image001.jpg" o:></v:imagedata></v:shape></span></span></span></a></span></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">木屋架常用的跨度<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">(l)</span>為<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">9</span>～<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">15</span>米<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">,</span>按</span></span></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 16px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: #333333; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><st1:chmetcnv style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" w:st="on" unitname="米" tcsc="0" sourcevalue="3" numbertype="1" negative="False" hasspace="False"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">3</span>米</span></st1:chmetcnv></span></span></span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">間距布置屋架，節間長度取<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">2</span>～<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">3</span>米。<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US"></span></span></span></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">為了保證各種屋架的剛度<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">,</span>應根據所用材料、制造條件以及連接方式<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">,</span>確定適當的高跨比<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">(<sub style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">h</sub>/l)</span>。對于采用半干材手工制作的齒連接原木或方木屋架，三角形屋架的高跨比<sub style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">h</span></sub><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">/l</span>≥<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">1/5,</span>梯形和多邊形屋架的高跨比<sub style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">h</span></sub><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">/l</span>≥<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">1/6</span>時，可不必驗算撓度。<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US"></span></span></span></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">鋼木屋架</span></span></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">常用的形式也是豪式桁架，僅將下弦換為鋼材<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">;</span>也有采用芬克式桁架和沃倫式桁架。按</span></span></span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 16px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: #333333; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><st1:chmetcnv style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" w:st="on" unitname="米" tcsc="0" sourcevalue="3" numbertype="1" negative="False" hasspace="False"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">3</span>米</span></st1:chmetcnv></span></span></span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">布置的屋架，下弦采用圓鋼比用型鋼能較充分地利用鋼材的強度。節間較大時，可加設吊桿，將圓鋼下弦的長細比控制在<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">1000</span>以內，防止過度下垂。型鋼下弦的剛度較大，有利于防震。<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US"></span></span></span></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">鋼木屋架下弦節點常因構造需要而增加鋼板，所以下弦節點越多<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">,</span>則不受力或受力很小的鋼板增加越多<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">;</span>為了節約鋼材，應盡量擴大節間長度，減少節點數目。若將上弦在節點處偏心抵承（圖<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">2</span>中的<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">c</span>）構成反彎矩，以抵消部分正彎矩，可在常用的木材規格不增大截面的條件下，提高木構件的承載力，達到擴大節間，減少節點，既節省鋼材、木材，又簡化了制造。<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US"></span></span></span></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US"><a style="PADDING-BOTTOM: 0px; MARGIN: 0px; OUTLINE-STYLE: none; OUTLINE-COLOR: invert; PADDING-LEFT: 0px; OUTLINE-WIDTH: medium; PADDING-RIGHT: 0px; COLOR: rgb(51,51,51); TEXT-DECORATION: none; PADDING-TOP: 0px" title="" ><span style="color:#00cc;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; TEXT-DECORATION: none; PADDING-TOP: 0px"><v:shape style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; WIDTH: 112.5pt; PADDING-RIGHT: 0px; HEIGHT: 230.25pt; PADDING-TOP: 0px" title="" type="#_x0000_t75" o:button="t" alt=""><v:imagedata style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image003.jpg" o:></v:imagedata></v:shape></span></a></span></span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US"><a style="PADDING-BOTTOM: 0px; MARGIN: 0px; OUTLINE-STYLE: none; OUTLINE-COLOR: invert; PADDING-LEFT: 0px; OUTLINE-WIDTH: medium; PADDING-RIGHT: 0px; COLOR: rgb(51,51,51); TEXT-DECORATION: none; PADDING-TOP: 0px" title="" ><span style="color:#00cc;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; TEXT-DECORATION: none; PADDING-TOP: 0px"><v:shape style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; WIDTH: 112.5pt; PADDING-RIGHT: 0px; HEIGHT: 230.25pt; PADDING-TOP: 0px" id="_x0000_i1026" title="" type="#_x0000_t75" o:button="t" alt=""><v:imagedata style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" src="file:///C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\msohtml1\01\clip_image003.jpg" o:></v:imagedata></v:shape></span></a></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">鋼木屋架常用的跨度為<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">12</span>～<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">24</span>米<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">,</span>節間長度可達</span></span></span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 16px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: #333333; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><st1:chmetcnv style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" w:st="on" unitname="米" tcsc="0" sourcevalue="4" numbertype="1" negative="False" hasspace="False"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">4</span>米</span></st1:chmetcnv></span></span></span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">。由于剛度比木屋架大，高跨比可適當減小。三角形屋架<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">h/l</span>≥<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">1/6</span>、梯形及多邊形屋架<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">h/l</span>≥<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">1/7</span>時，可不必驗算撓度。<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US"></span></span></span></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">椽架</span></span></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">是按椽條間距密置的屋架，常用芬克式桁架。節點用齒板或用結構膠合板釘壓膠結。常用的跨度為<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">6</span>～<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">9</span>米。由于節點具有較大的剛性，高跨比<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">h/l</span>≥<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">1/7</span>時<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">,</span>可不必驗算撓度。椽架的間距通常為</span></span></span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 16px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; COLOR: #333333; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><st1:chmetcnv style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" w:st="on" unitname="厘米" tcsc="0" sourcevalue="60" numbertype="1" negative="False" hasspace="False"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">60</span>厘米</span></st1:chmetcnv></span></span></span><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">，在其上面直接鋪屋面板，使屋面系統簡化，比一般木屋蓋能節約木材<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US">30</span>％左右?？捎糜诿裼梅课菀约靶⌒凸I車間。<span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px" lang="EN-US"></span></span></span></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px"><span style="font-family:宋體;color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">木屋蓋的支撐系統</span></span></span></p><p style="PADDING-BOTTOM: 0px; TEXT-TRANSFORM: none; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 12px/25px 宋體; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(51,51,51); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-stroke-width: 0px"><span style="PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 12px; PADDING-TOP: 0px"><span style="font-family:宋體;color:#333333;PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; PADDING-TOP: 0px">為了防止屋架側傾，保證屋架受壓弦桿平面外穩定，承擔和傳遞房屋縱向水平力（風力、懸掛吊車制動力及地震力），應將屋架上弦節點處或其附近的檁條與屋架及山墻可靠地錨固，以構成空間穩定體系。對于梯形屋架尚需設置端部的垂直支撐，將屋面木骨架與山墻及屋架連成完整的空間穩定體系。當這個空間體系的縱向剛度不足時，應在上弦平面設置橫向支撐。若屋架下弦懸掛吊車，應在懸吊點的縱向平面內設置中間垂直支撐，在未設中間垂直支撐的開間，應設置縱向水平系桿使屋架連成一體，將吊車制動力傳遞到屋面。當有天窗時，應沿天窗側柱設置垂直支撐，將天窗范圍內的縱向力傳遞到屋面</span></span></p></div> </div>  </div>  <div class="bg3"> <div class="warp_box"> <div class="foot_txt">Copyright ® 2021 長沙綠力環?？萍加邢薰?(cslvli.com) All Rights Reserved　備案號：<a target="_blank" >湘ICP備13011506號-1</a><br> 地址：長沙市開福區大明工業園　電話：0731-86677948 　技術支持：<a title="長沙網站建設|長沙網絡推廣|長沙網絡營銷" target="_blank" >飛信網絡</a>　<br /> 免費電話：400-705-6889　傳真：0731-86677948　郵箱：2683110340@qq.com</div> </div> </div> <script type="text/javascript"> $(function(){ var KF = $(".keifu"); var wkbox = $(".keifu_box"); var kf_close = $(".keifu .keifu_close"); var icon_keifu = $(".icon_keifu"); var kH = wkbox.height(); var kW = wkbox.width(); var wH = $(window).height(); KF.css({height:kH}); icon_keifu.css("top",parseInt((kH-100)/2)); var KF_top = 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