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ASCE 7-22设计学习笔记第八期

  • 2026-02-09 09:29:05
ASCE 7-22设计学习笔记第八期

学习12.10.4(下)章内容

书接上回,我们总结了可以使用12.10.4简化设计的限制条件:

1、隔板的X和Y向均需要按照12.10.4计算;(要简化两个方向要一起简化)

2(a)、木结构的diaphragm:如胶合板(AWC SDPWS),需与木框架构件或木钉板(wood nailers)通过钉接固定,并满足剪切承载力表要求;

2(b)、钢deck板diaphragm,裸露(无混凝土面层)的钢 deck,需满足AISI S400或ASI S310的最小剪切承载力要求;

3、禁止在木结构板上或裸钢deck板上覆盖混凝土或者类似会影响其刚度和强度的材料;

4、除了允许出现水平不规则2以外不许出现其他的水平不规则情况;

5、隔板必须为矩形,或用于抗震设计的时候可划分为多个矩形段。矩形段的两端需要设置竖向抗侧力系统;

6、允许的竖向抗侧力结构体系:

混凝土剪力墙、预制混凝土剪力墙、砌体剪力墙、钢支撑框架结构、钢-混凝土组合剪力墙

(注意:不能是纯框架)

7、竖向抗侧力结构体系的设计方法:按12.8节设计,但是允许使用12.2.3.4。

本期开始拆解,12.10.4.2如何设计:这节规定了diaphragm、chords和collectors必须在两个正交方向设计,抵抗平面内的地震设计力。通过提高diaphragm的设计力来适应柔性隔板的动力特性。

12.10.4.2.1:设计地震力,本小节可以对比12.10.1.常规方法来看,12.10.1的荷载大小很大程度上取决于你上面还有多少楼层,而12.10.4在源头就没有这个情况,因为是单层,响应谱的思路类似于ELF:V=Cs×W,通过柔性楼盖专用的参数RdiaphTdiaph,周期是基于隔板跨度的假周期,常规方法也可以计算柔性隔板的影响,但是要通过12.10.3节的内容精细计算,而本节就是完全不同于常规方法的独属于柔性隔板的简化方法,从柔性隔板本身的动力特性入手:

Ldiaph是每个矩形隔板的跨度:diaphragm segment span

12.10.4.2.2隔板剪力计算,本节考虑柔性隔板在端部可能存在较大的剪力集中,当跨度不超过30.5m时,对整个柔性隔板整体放大剪力,当跨度超过30.5的时候,只对10%跨度的边缘区域放大剪力,不是叠加多放大的意思,其实就是短跨隔板,由于整体变形相对均匀,可以整体放大,但是长跨隔板会出现靠近竖向构件(支座处)的地方剪力较大,中间区域较小的情况,所以只放大端部区域。

Ldiaph<100ft(30.5m)

V=V(12.10.4.2.1计算值)×1.5

Ldiaph≥100ft(30.5m)

设置剪力放大区域:就是10%的跨度宽度内;和其他区域;

剪力放大区域:V=V(12.10.4.2.1计算值)×1.5

其他区域,按V=V(12.10.4.2.1计算值)

12.10.4.2.3diaphragm chords就是隔板四周能够抵抗楼板受弯产生的拉力和压力。这有着强制的布置要求,无论是整体隔板的edge还是划分矩形板的edge,都要设置,而且不能中断,否则无法传递荷载。

很多设计人员还是无法分清楚chords和collectors,乍一看我也看了挺久,其实在本节会比之前更清晰能分辨,最简单的就是数学位置关系的不同,chords是平行于我们竖向抗力体系的,比如你剪力墙,chords是平行于抗侧力体系(举例剪力墙),而collectors是垂直于抗侧力体系,或者说是从隔板内部指向剪力墙。如果从重要性看,collectors是用来传递荷载的重要构件,解决力的传递路径问题;而相比之下chords则是用来固定柔性隔板的“收边件”,解决的是隔板自身的强度问题。

12.10.4.4给出了collectors的受力原理,其实就是上文我写的那样。

1、当抗震设防为SDC-A/B的时候,按Fpx计算即可

1、当抗震设防为SDC-C~F的时候,要超强设计,考虑overstrength factor

Ω0-diaph=2.0,且计算出的超强需求不需要超过Rdiaph,避免过度设计,计算collectors的时候不用额外组合考虑12.10.4.2.2的1.5倍放大系数,用Fpx即可。

12.10.4.2.5隔板的挠度,和前几段一样,首先规定里使用Fpx(12.10.4.2.1)的荷载计算,然后就是定义了不同材料类型的隔板的位移放大系数Cd-diaph:挠度的计算需要查阅材料的规范确定。

12.10.4.2.6本节最后的内容是如何修正楼盖的抗震设计,本文提及在使用12.10.4进行隔板设计时,有两条footnote不需要考虑,一条是Table 12.2-1b,另一条是section 12.3.3.5,让我们仔细看看说了啥:

12.2-1b的意思是屋面是柔性隔板,如果超强系数超过2.5可以允许减小0.5,这条不适用于使用12.10.4章节计算的单层柔性隔板,我理解的意思就是在计算Ω0-diaph的时候,不采取这条进行折减,互成体系的抗侧力构件的Ω也不采取这条进行折减。

12.3.3.5其实就是豁免了存在截图中不规则的情况下,如果是通过12.10.4的单层柔性结构可以在计算时不进行25%的设计力增大。

本期完~

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  1. CONNECT:[ UseTime:0.000448s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000949s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000326s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000275s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000540s ]
  6. SELECT * FROM `set` [ RunTime:0.000210s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000575s ]
  8. SELECT * FROM `article` WHERE `id` = 466261 LIMIT 1 [ RunTime:0.000527s ]
  9. UPDATE `article` SET `lasttime` = 1770608493 WHERE `id` = 466261 [ RunTime:0.001086s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000241s ]
  11. SELECT * FROM `article` WHERE `id` < 466261 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000446s ]
  12. SELECT * FROM `article` WHERE `id` > 466261 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000416s ]
  13. SELECT * FROM `article` WHERE `id` < 466261 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000924s ]
  14. SELECT * FROM `article` WHERE `id` < 466261 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002520s ]
  15. SELECT * FROM `article` WHERE `id` < 466261 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000843s ]
0.078768s