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钢结构土木2009zwf07钢桁架课件

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钢结构土木2009zwf07钢桁架课件
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The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * 第8章 格构式受弯构件—钢桁架 Chapter 8 Latticed Flexural Member--- Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * §8.1 格构式受弯构件的工作机理 §8.2 钢桁架的布置方式 §8.3 钢桁架的支撑系统设计 §8.4 钢桁架的形式与主要尺寸 §8.5 钢桁架的荷载与内力计算 §8.6 钢桁架杆件的计算长度 §8.7 双角钢钢桁架杆件的截面选择 §8.8 双角钢桁架的节点设计 Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss §8.1 格构式受弯构件的工作机理 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss 抗弯机制抗弯机制 抗剪机制抗剪机制 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss 桁架外形与内力的关系桁架外形与内力的关系 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss 平面桁架平面桁架 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss 上弦杆 下弦杆 斜腹杆 中间节点 支座节点 正放四角锥网架正放四角锥网架 边边相连边边相连 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss 正放抽空四角锥网架正放抽空四角锥网架 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss 有檩檩体系屋盖 无檩檩体系屋盖 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * §8.3 钢桁架的支撑系统设计 Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * 平面钢屋架在屋架平面外的刚度和稳定性很差,不能 承受水平荷载。为使钢屋架结构有足够的空间刚度和稳定 性,必须在屋架间设置支撑系统。 垂直支撑 上弦横向水平支撑 下弦横向水平支撑 下弦纵向水平支撑 系杆 支撑系统的组成 Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * 1.垂直支撑 所有钢钢屋盖均应设应设 置垂直支撑。 布置位置: 屋架的垂直支撑应与上、下弦横向水平支撑设置在同一柱间 。 每隔4~5个屋架布置一道。 作用:使相邻邻屋架形成几何不变变的空间间体系,保证侧证侧 向稳稳定 。 Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * 2.上弦横向水平支撑 作用:保证屋架侧向刚度和屋盖的空间刚度,减小上弦在平 面外计算长度,承受和传递端墙的风荷载。 一般情况下均应设置。 布置:通常应设置在房屋两端或纵向温度区段两端的第一柱间, 有时也可将其布置在第二个柱间,但在第一个柱间要设置刚性系 杆以支持端屋架和传递端墙风力。 最大间距为60m,否则在中间应增设一道或几道支撑。 Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * 可不设设的情况: 大型屋面板,且能保证证三点焊焊接质质量。 Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * 3.下弦横向水平支撑 一般情况下宜设设置。 作用: 山墙抗风柱的支点,承受并传递水平风荷载 、悬挂吊车的水平力和地震引起的水平力,减小下弦的 平面外计算长度,减小下弦的振动。 Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * 必须设置:设有10t以上桥式吊车的厂房屋盖 可以不设: 跨度较小(小于18m时) 屋架下弦无悬挂吊车 厂房内无较大的振动设备。 布置: 与上弦横向支撑布置在同一开间,形成稳定的空间体系 ,其最大间距为60m。 Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * 4. 下弦纵向水平支撑 一般不设设。 布置:屋架两端节间平面内,与横向水平支撑形成封闭框。 Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * 下列情况必须设须设 : 1)房屋较高、跨度较大、空间刚度 要求较高时 2)房屋内设有托架 3)设有重级或大吨位的中级工作制 桥式吊车等较大振动设备 下弦纵向水平支 撑 Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * 作用:在无横向水平支撑的开间处,保证屋架的侧向稳定,减 小弦杆的计算长度,传递水平荷载。 刚性系杆(既能受拉也能受压,[λ]=200) 柔性系杆(只能承受拉力,[λ]=400 ) 屋架主要支承节点处的系杆,屋架上弦脊节点处的系杆均宜用 刚性系杆。 5.系杆 布置: 在横向水平支撑或垂直支撑节点处应沿房屋通长设置系杆。 当横向水平支撑设在第二柱间时,则第一柱间端屋架需与第 二榀屋架用刚性系杆连接。 屋脊节点、屋架支座节点设置刚性系杆。 Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * 6. 支撑的构造和计算 支撑与屋架 的连接通常 用M20的C 级螺栓,支 撑与天窗架 的连接通常 用M16的C 级螺栓 。 Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss 交叉斜杆以及柔性系杆按拉杆设计设计 ,通常用单单角钢钢截面 单单斜杆按压压杆设计设计 ,宜采用双角钢钢做成的T形截面或十字形截面 刚刚性系杆按压压杆设计设计 ,常用十字形截面使在两个方向具有等稳稳 定性。 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss 通常钢屋架支撑受力较小,截面尺寸一般由杆件容许长 细比和构造要求决定。 交叉斜杆的长细长细 比 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss §8.4 钢桁架的形式与主要尺寸 一、屋架形式选择的原则一、屋架形式选择的原则 满足适用、受力合理、经济和制造安装方便的原则。满足适用、受力合理、经济和制造安装方便的原则。 1.满足适用要求 屋架外形应与屋面材料的排水要求相适应。 2.满足受力合理要求 · 屋架外形应尽量和弯矩图接近,使上下弦杆 内力沿跨 度方向分布较均匀,腹杆受力较小; · 腹杆的布置宜使短杆受压,长杆受拉; · 荷载布置在节点上(如采用再分杆),减少弦杆局部 受弯。 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss 上承式下承式 · 再分式 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss 二、屋架的主要尺寸二、屋架的主要尺寸 跨度: 据工艺艺需要定,一般为为3m模数,12、15、18、 21、24、27、30、36m等(注意:柱轴线轴线 距离) 。 3.满足经济、制造安装简便及运输要求 · 构造简单,杆件夹角30°~60°; · 杆件与节点的类型数量少; · 分段制造,便于运输与安装; The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss 高度:根据经济经济 、刚刚度和建筑要求,以及屋面坡度,运 输输条件等确定。 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss 屋架上弦节间:据屋面材料定,尽可能使荷载直接作用 在屋架节点上 ,避免上弦杆产生局部弯距。 三角形桁架 跨中高度 h≈(1/4~1/6)l 上弦坡度i≈(1/3~1/2) 梯形桁架 跨中高度 h≈(1/6~1/10)l 上弦坡度(1/8~1/12) 端部 h0≈1.6~2.2m(铰铰接时时) h0≈1.8~2.4m(刚刚接时时) 屋架跨中最大高度取决于运输输界限,如铁铁路运输输界 限为为3.85m 。 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss §8.5 钢桁架的荷载与内力计算 一一. . 桁架的荷载计算与荷载组合桁架的荷载计算与荷载组合 (1)桁架荷载 永久荷载: 屋面材料、保温层、防水层、檩条、支撑、屋架、 天窗架等结构自重。 可变荷载:屋面均布活荷载、雪荷载、 积灰荷载、风荷载、悬 挂吊车荷载等。屋面活荷载与雪荷载不同时出现,取两者中较大 值计算。 桁架和支撑自重可按经验公式: gWk=(0.12+0.11l)kN/m2 按屋面的水平投影面分布。不设吊顶时可全部作用在上弦节点 。 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss (2)荷载组合 ① 1.2×永久荷载标载标 准值值+1.4×可变变荷载标载标 准值值 ② 1.2×永久荷载标载标 准值值+1.4×半跨可变变荷载标载标 准值值 ③ 1.2×屋架、支撑和天窗架自重标标准值值 +1.2×半跨屋面板重标标准值值 +1.4×半跨屋面活荷载标载标 准值值 ④ 1.0×永久荷载标载标 准值值+1.4×风风荷载标载标 准值值 通过计过计 算确定判断是否需要考虑虑1.35组组合 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss 二二. . 桁架杆件的内力计算桁架杆件的内力计算 (1)基本假定 a. 桁架的各节节点均视为铰视为铰 接。 b. 桁架所有杆件的轴线轴线 平直且都 在同一平面内且在节节点处处交汇汇。 c. 荷载载都作用在节节点上,且都在 桁架平面内。 (2)内力计计算 用数解法或图图解法或借助电电 算,求出节节点荷载载作用下屋架 各杆件的内力 一般节节点刚刚性引起杆 件次应应力数值较值较 小 ,不予考虑虑。但荷 载载很大的重型桁架 有时时需要计计入次应应 力的影响。 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss (3)节节点荷载计载计 算 一般,桁架上的荷载载通过檩过檩 条和大型屋面板肋以集中力方 式作用于桁架上弦节节点。 吊顶顶荷载载或悬悬挂吊车车荷载载作用于桁架下弦节节点。 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss §8.6 钢桁架杆件的计算长度 一. 杆端约束的影响 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flexural Member---Steel Truss 影响钢钢桁架杆端约约束大小的因素 1)杆件轴轴力性质质 拉力使杆拉直,约约束作用大,压压力使杆件弯曲,约约束作 用微不足道。 2)杆件线刚线刚 度大小 线刚线刚 度越大,约约束作用越大,反之,约约束作用越小。 3)与所分析杆直接刚刚性相连连的杆件作用大,较远较远 的杆件作 用小。 The guiding ideology should be guided by Deng Xiaoping's theory, the important thought of “three represents“ and the spirit of the 16th CPC National Congress and the third Plenary session of the 16th CPC Central Committee. * Chapter 8 Latticed Flex
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