当前位置:首页>学习笔记>美标钢结构设计学习笔记第十六期——混凝土结构的的位移角和挠度到底如何确定

美标钢结构设计学习笔记第十六期——混凝土结构的的位移角和挠度到底如何确定

  • 2026-02-12 11:39:40
美标钢结构设计学习笔记第十六期——混凝土结构的的位移角和挠度到底如何确定
混凝土结构的的位移角和挠度到底如何确定

Drift & Deflection Check

书接上期,虽然这个系列是美标钢结构,但是中插一集对应十五期的混凝土结构的Drift & Deflection Check,混凝土美标结构没咋做过,希望各位大佬多指错。我会按照十五期的内容整理出来一份。

和钢标一样,砼结构的serviceability limit state的要求是在ACI 318-25的24章节,这一节内容很多我不做展开,只根据我上一期的逻辑,总结一下以现浇混凝土结构系统为主的位移角和挠度如何限制。24章开篇列出了不需要进行挠度计算的构件工况:即满足7.3、8.3和9.3的最小厚度要求的现浇混凝土结构系统,通常在正常使用的情况下已经能够满足人体舒适性的要求,不需要验算挠度。除了截图里的abc三种情况,这三种情况简单来说就是大跨度的商场啊、大跨度的大开间,或者是对振动有精密性要求的厂房或者车间,或者是有大振动设备的结构,这些就算厚度满足要求,也要按24章的内容进行挠度验算,而挠度限值不仅仅满足TABLE 24.2.2的要求。怎么理解这个表我会放在本期的第二小节解释。

16.1挠度校核的荷载组合Load combination

15期提到过immediate deflections和time-dependent deflections,就是短期挠度和长期挠度,长期挠度其实也就是考虑现浇混凝土的徐变和收缩影响。

24章一大段篇幅都在说怎么计算构件挠度,24.2.3节计算短期挠度,受到活载和雪荷载等短期荷载作用产生时的挠度的计算方法,它的计算核心还是基于弹性挠度计算公式,考虑考虑裂缝和钢筋对构件刚度的影响,用EcIe取代EcIg,其中弹性模型Ec(19.2.2),通过有效惯性矩Ie的计算:

预应力构件的计算(24.2.3.8~24.2.2.3.9)不展开。

24.2.4节就开始讲长期挠度time-dependent deflection怎么计算,上一期有提过,混凝土结构要计算长期挠度,考虑混凝土的creep和shrinkage引起的附加挠度。

规范给出了建议的通过引入长期挠度系数来叠加计算长期挠度,当然,如果有更精确更全面的分析得出结果那就更好了,否则就按公式24.2.4.1.1来简化计算长期挠度系数。

预应力构件的计算详见24.2.4.2,我不展开。组合结构考虑到浇筑过程中的临时支撑的作用,所以可以在计算挠度的时候,将其作为整浇结构进行考虑,其他不展开,详见24.2.5。

16.2 Vertical deflection

表24.2.2其实和上一期的IBC的表1604.3是能对上的:

构件类型

控制工况

挠度限制

屋面(无吊顶或支撑其他会因为挠度过大产生破坏的非结构构件)

L or S or R

L/180

楼面(无吊顶或支撑其他会因为挠度过大产生破坏的非结构构件)

L

L/360

屋面、楼面(支撑非主结构构件)

D+L

L/240(非主结构构件不容易因为挠度破坏而破坏)

L/480(非主结构构件容易因为挠度破坏而破坏)

文中提到了7.3和8.3和9.3的最小厚度要求,我也一并整理一下:

简单理解,举例,比如说我一根楼面梁,不支撑墙体,也没有吊挂吊顶,也不是悬挑梁,只是一根bare beam,我只要厚度满足9.3的要求,我就可以不验算这根梁的挠度。(当然要满足24章提到的不可以不验算的那些条件)

16.3 位移比校核的荷载组合Load combination

上一期其实我只写了风荷载控制下的地震位移比验算,因为之前学习地震(ASCE 7的12章节有提及),地震位移比限制详见其TABLE 12.12-1,所以混凝土的部分,也是不展开写地震作用下的位移比。

风荷载作用下的荷载组合,同样是通过ASCE 7 APPENDIX CC,这是非强制性条文,荷载组合还是D+0.5L+Wa,具体Wa的取值详见上一期的内容。

16.4 位移比限值Drift of Walls and Frame

和钢结构一样,其实并没有确定的位移比限值,只是给出了推荐值H/400~H/600,相较于钢结构,混凝土有着较大的刚度,钢结构通过文中的参考文献,查到了一些具体情况的可参考值,混凝土结构我认为就以H/400~H/600应该也是容易达到的,如果各位大佬有具体的工程经验,通常以什么标准进行控制,希望在评论区进行讨论。

16.5 起拱Camber

上一期没有写起拱,其实当挠度超过限制的时候,可以通过起拱来进行部分抵消,ASCE 7的CC.4明确了可以使用起拱来抵消部分挠度。但是吧,没规定你啥情况必须起拱,也没明确你到底起拱多少,都要靠你的工程判断,我理解就是平屋面,我们可起拱,来排水,或者起拱来防止积水,再或者就是跨度特别大,起拱来减小挠度超限的压力。

本期完,春节看心情更新~

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  1. CONNECT:[ UseTime:0.001149s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001395s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002308s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000711s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001481s ]
  6. SELECT * FROM `set` [ RunTime:0.000566s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001489s ]
  8. SELECT * FROM `article` WHERE `id` = 467993 LIMIT 1 [ RunTime:0.002155s ]
  9. UPDATE `article` SET `lasttime` = 1770960994 WHERE `id` = 467993 [ RunTime:0.005867s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000698s ]
  11. SELECT * FROM `article` WHERE `id` < 467993 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001908s ]
  12. SELECT * FROM `article` WHERE `id` > 467993 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002003s ]
  13. SELECT * FROM `article` WHERE `id` < 467993 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006461s ]
  14. SELECT * FROM `article` WHERE `id` < 467993 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011701s ]
  15. SELECT * FROM `article` WHERE `id` < 467993 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003867s ]
0.241732s