当前位置:首页>学习笔记>美标钢结构设计学习笔记第十二期

美标钢结构设计学习笔记第十二期

  • 2026-02-11 13:59:06
美标钢结构设计学习笔记第十二期

本期会拆解CHAPTER J(上)的内容

J1:通用规定

J2:焊缝和焊缝接头

J3:螺栓、螺栓节点

J4:节点和受影响的构件

J5:填充物

J6:拼接

J7:承载能力

J8:柱脚和混凝土基础

J9:锚栓及预埋件

J10:承受集中力的腹板和翼缘

这一章节的内容主要就是告诉设计者如何计算焊缝、螺栓以及如何计算节点处的板件、节点板等区域在各种受力状态下的强度。不过需要注意的一点是,这一章不涉及疲劳荷载,疲劳相关的内容要看单独的章节。(APPENDIX 3)

ØJ1通用规定

这一小节与之前一样,也是J章节的游戏规则,给J章的后续小节确定了计算原则。

Design basis

1、设计强度按章节B规定确定

2、所需强度要根据具体的计算结果确定

3、当荷载存在偏心时,需要考虑偏心力的影响

Simple connections

(理想的铰接连接)

1、shall be designed as flexible connections(reactions shear only)

2、Flexible beam connection is permitted to have end rotation

→允许出现非弹性和自我限制的变形即会出现被允许转动

Moment connections

(理想刚接连接)

1、end connections承受弯矩和剪力

2、The rigidity of connections

节点的刚性对构件计算的影响要考虑

→具体计算见B3.4b

Compression members with bearing joints

(压杆的连接节点)

1、承压的压杆的splice足够大(端铣平)足以直接抗压

2、非承压的压杆的splice截面要保证对中(in line),强度要求不小于下面两条要求:

即虽然节点受压,但是要有一定的抗拉和抗弯能力

Splices in heavy sections

(厚板)

如果全熔焊坡口焊连接节点处要传递拉力,则要在焊材的韧性、坡口尺寸、焊材金属、焊接表面的处理即检验要求等有详细的要求(工厂焊的不需要满足):

Weld access holes(焊接处工艺细节)

J1.6详细的提出了对关系到焊缝质量的焊缝工艺构造要求,拆解不展开。

Placement of welds and bolts(螺栓和焊缝的定位)

除非特殊允许的偏心情况下,应该与构件重心对齐。

Bolts in combination with welds

(如何考虑螺栓和焊缝的共同作用)

1、通常情况下,螺栓和焊缝不可以共同分担荷载

2、但是高强螺栓和角焊缝同时存在的端板连接情况是存在的,螺栓提供抗滑移阻力,焊缝贡献被熔焊的金属的强度。

3、高强螺栓具体要求详见J3.1,且能提供的强度值不得小于所需强度的33%;当考虑共同作用的时候,角焊缝提供的强度不能小于所需总强度的50%或70%(区别在于螺栓的连接工艺不同);

Welded alterations to structures with existing rivets or belts(旧结构改造)

→焊接改造值用来抵抗额外需要的强度

High-strength bolts in combination with existing rivets

→利用高强螺栓与旧结构已有的铆钉一起来抵抗荷载

ØJ2焊缝和焊接节点

焊缝需要满足焊接规范Structural Welding Code—Steel (AWS D1.1/D1.1M),本规范用语说明与焊接规范不一样的地方。

本节都是焊接细节,不做逐字详图,只简单罗列规范的框架,大家使用的时候再仔细研究即可。

J2.1

Groove welds坡口焊

1a、有效面积

1b、限制条件

J2.2

Filled welds角焊缝

2a、有效面积

2b、限制条件

J2.3

Plug and slot welds塞焊

3a、有效面积

3b、限制条件

J2.4

strength

1、焊接节点的强度要根据母材的强度和焊材的强度分别计算,取较小值

2、不同类型的焊缝在载荷下有不同的名义强度计算公式,详见table2.5

3、当外力的合力通过焊缝组的形心,名义强度可以按下述公式进行计算:

J2.5

Combination of

welds

如果多种不同的焊缝成组出现,要分开单独计算

J2.6

Filler metal requirements

不同的焊接类型、母材型号需要使用不同匹配的焊材。

J2.7

Mixed weld metal

所有的焊材需要具有兼容性。

ØJ3螺栓和螺栓节点

J3.1普通螺栓,除非有施加预应力的需求,一般使用ASTM A307螺栓。(用于次结构或者不需要高强度的地方)

J3.2高强螺栓,默认按RCSC验算(Research Council on Structural Connections),本规范只规定与RCSC不一样的地方。

螺栓的型号与其对应的钢材编号如下所示,其中Group120可以对应国内的8.8s螺栓,Group150可以对应国标的10.9s螺栓。

螺栓的安装方式:

Snug-Tight Condition ( snug-tight )承压型

对应国标的承压型

其实就是拧到钢板紧密贴紧,看不见肉眼缝隙(依靠螺栓本身的承压和抗剪能力)

1、常用于bearing-type connections,通过螺栓抗剪和连接板承压来传递荷载

2、Group120螺栓当受拉或拉剪,且用于不存在松动和疲劳的情况。

Pretensioned预紧型

类似对应国标的摩擦型

将螺栓拧紧到规范规定的拧紧力TABLE J3.1/3.1M

Slip-Critical摩擦型

对应国标的摩擦型

利用板件的摩擦力来传递荷载

1、也有预紧

2、绝对不滑移

J3.3螺栓孔洞大小详见TABLE J3.3/3.3M,共分为四种类型,四种类型对应的连接类型如下表总结:除非特殊指定,默认选择标准型和短槽型螺栓孔,同时short-slotted是垂直于荷载方向的。指型垫片和螺母要求详见J3.3.c和J3.3.g,四种开孔的适用要求详见J3.3.d~f。

Standard圆形

可用于slip-critical connections和bearing-type

Oversize圆形

用于slip-critical connections,禁止用于bearing-type

Short-slotted长方形

可用于slip-critical connections和bearing-type

Long-slotted长方形

可用于slip-critical connections和bearing-type(荷载方向有要求)

J3.4规定了螺栓孔最小中心间距和净距要求:

J3.5规定了螺栓最小边距的要求:标准孔型的最小边距要求详见TABLE J3.4/J3.4M;oversize hole和slotted hole的最小边距=标准孔的最小边距+额外增量C2,其实就是额外补偿了孔洞扩大后材料的削弱,C2表格详见TABLE J3.5/J3.5M。

J3.6规定了螺栓之间和螺栓与构件的最大间/边距要求

最大边距:min{12倍连接板厚度,150mm}

最大纵向间距:

未完待续

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  1. CONNECT:[ UseTime:0.000681s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000666s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000357s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000254s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000494s ]
  6. SELECT * FROM `set` [ RunTime:0.000202s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000517s ]
  8. SELECT * FROM `article` WHERE `id` = 462154 LIMIT 1 [ RunTime:0.001756s ]
  9. UPDATE `article` SET `lasttime` = 1770835483 WHERE `id` = 462154 [ RunTime:0.006008s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000286s ]
  11. SELECT * FROM `article` WHERE `id` < 462154 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000550s ]
  12. SELECT * FROM `article` WHERE `id` > 462154 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000934s ]
  13. SELECT * FROM `article` WHERE `id` < 462154 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006326s ]
  14. SELECT * FROM `article` WHERE `id` < 462154 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000776s ]
  15. SELECT * FROM `article` WHERE `id` < 462154 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001089s ]
0.090464s