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美标钢结构设计学习笔记第十四期

  • 2026-02-08 08:21:22
美标钢结构设计学习笔记第十四期
拆解到今天,除了附录还剩下KLMN四个章节

K:HSS截面和箱型截面节点设计补充要求

L:正常使用状态设计要求

M:钢结构的制造和安装

N:项目质量管理体系和检验要求

先说一下近期的学习安排,今天会快速拆解一下章节K,下周我会根据章节L的大纲,结合ASCE7-22一起学习结构的正常使用极限状态的限值。章节M和章节N就不展开学习了。

K1:HSS构件连接的通用参数

K2:HSS受集中力作用的强度计算

K3:HSS的truss连接(轴力为主)

K4:HSS的moment连接(弯矩+轴力)

K5:HSS节点的焊缝计算

ØK1: 通用参数

开篇提出了基本的几何限制:

共面性(common plane):连接节点的两边构件的centerlines必须在同一个面上,保证荷载能在平面内传递,同时也可以简化计算。

本章节的所有设计标高,都跟着各自的适用范围,这些是基于大量的实践和试验数据制定的。如果你满足这些要求,你可以直接使用表格的公式和方法计算,如果不满足,不代表你不能这样连接,只是说你不能使用这一章的简化公式,你要用FEA或者更深入的理性分析计算这个节点。

同时要注意,J章和K章只是用于检验节点是否安全,即复核强度,如果你有挠度、稳定等变形问题,请看commentary的同步章节部分。

K1分别定义了K章后续简化公式计算表格中的各项参数,详见K1.2~4。

ØK2: 受集中力的HSS构件节点强度计算

本节给出了受到集中荷载的圆形和矩形截面的HSS怎么进行强度验算,圆形HSS可以满足表格限定要求(TABLE K2.1A)的情况下可以直接使用TABLE K2.1的简化公式进行计算。

矩形HSS受集中力的详见章节J,K章不提供简化计算。

ØK3: 空间桁架中的HSS-to-HSS连接

这个标题我感觉要整体翻译理解一下,HSS-to-HSS truss connections consist of one or more branch members directly welded to a chord that passes as a continuous element through the connection.就是通过一根贯穿的HSS,连接多个分支HSS,其实分类看,就是常见的K型、T型、交叉等,不同的形式受力和破坏模式是不一样的,最重要的就是先区别他们。这一节的节点以传递轴向力为主,杆件只受压或者受拉,通过焊接连接,这一节也就是计算他们的最大轴向承载能力。

本节主要针对的是空间桁架中非常常见的HSS-to-HSS,圆形HSS可以满足表格限定要求(TABLE K3.1A)的情况下可以直接使用TABLE K3.1的简化公式进行计算。

矩形HSS可以满足表格限定要求(TABLE K3.2A)的情况下,可以直接使用TABLE K3.2的简化公式进行计算,最后结果和章节J里相关内容取较小值

ØK4: HSS-to-HSS的弯矩连接

HSS-to-HSS moment connections are defined as connections that consist of one 

or two branch members that are directly welded to a continuous chord that passes 

through the connection, with the branch or branches loaded by bending moments

区别于K3,K4讨论的要抵抗弯矩的HSS构件的强度计算。同样,首先要确定节点的类型,是T型、Y型还是cross型,从而选择合适的计算公式。

圆形HSS可以满足表格限定要求(TABLE K4.1A)的情况下可以直接使用TABLE K4.1下不同极限状态下的简化公式计算最小的那一个抗弯强度。

矩形HSS可以满足表格限定要求(TABLE K4.2A)的情况下,可以直接使用TABLE K4.2不同极限状态下的简化公式计算,最后结果和章节J里相关内容取较小值,都是取得最小值作为抗弯强度限值。

但是其实对比K3,一个节点不可能只收到轴向力或者只有弯矩,基本上是同时会收到轴力和弯矩的共同作用,所以设计人员需要同时检查K3和K4的要求,请注意这一点。

ØK5: HSS连接节点的焊缝计算

首先我觉得有必要把branch和plate提出来,branch字面意思是支管,其实就是被连接的角色,plate则是连接点的平板,是传递的媒介,其次本节开篇就表明了核心思想:

因为HSS构件考虑到中空的特性和荷载的方向,所以它的各边的刚度差别很大,荷载通过焊缝的位置的时候传递非常不均匀,因为这种不均匀形不能忽略,要考虑在焊缝强度的计算中。本节就是探讨如何合理的计算非均匀传力的焊缝强度。

核心公式是K5-1~5-3,分别计算轴力或剪力;平面内弯矩和平面外弯矩,同时也提醒必须考虑相互作用。

AISC 360-22我估计我也就拆解到这章就结束啦,附录和条文说明也是很重要的,最重要的还是要在实践中不断应用。本周开始我会先从章节L入手,开始啃ASCE7-22。

不同的连接方式对应不同的焊缝特性(le,Sop,Sip),详见TABLE K5.1(rectangular HSS)TABLE K5.2(round HSS)。

AISC 360-22就准备拆解到这个程度了,本周开始会从章节L入手,结合ASCE 7-22开始啃。

做这个账号的初衷就是督促自己学习,并且留点记录,仅此而已,但是现在我感觉是多了一个目标,就是帮助还在迷茫中的大家找到一个可以互相拼凑的经验的部落,一起探索,欢迎大家加入我建的交流群,一起分享出海设计里的难点和实用技巧。

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  1. CONNECT:[ UseTime:0.000484s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000794s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000290s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000288s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000501s ]
  6. SELECT * FROM `set` [ RunTime:0.000177s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000521s ]
  8. SELECT * FROM `article` WHERE `id` = 463059 LIMIT 1 [ RunTime:0.000425s ]
  9. UPDATE `article` SET `lasttime` = 1770634932 WHERE `id` = 463059 [ RunTime:0.013481s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000218s ]
  11. SELECT * FROM `article` WHERE `id` < 463059 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000467s ]
  12. SELECT * FROM `article` WHERE `id` > 463059 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000366s ]
  13. SELECT * FROM `article` WHERE `id` < 463059 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004818s ]
  14. SELECT * FROM `article` WHERE `id` < 463059 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001079s ]
  15. SELECT * FROM `article` WHERE `id` < 463059 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003305s ]
0.095926s