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ASCE 7-22设计学习笔记第六期

  • 2026-02-04 11:27:15
ASCE 7-22设计学习笔记第六期

学习12.9章内容

(a) Equivalent Lateral Force Procedure 

Section12. 8

(b)Modal Response Spectrum Analysis

Section12.9.1

(c)Linear Response History Analysis

Section12.9.2

(d)an analysis procedure

Authority Having Jurisdiction

(e)Nonlinear Response History Analysis 

Chapter16

书接上文,12.8节对应的是12.6节的方法a,等效剪力法就是通过静力等效,把设计反应谱转换为基底剪力,逻辑简单,是最常规的计算方法,SDC-B/C的规则高度不超限制的结构可用,抗震等级超过C或者不规则的结构禁止使用ELF。今天我们就基于12.9章节,看看方法b、c的使用规则和适用范围。

ELF简单的原因,是因为它的结构模型是假设结构像一个悬臂杆整体晃动,它是基于第一周期T的固定公式,所以它对结构的规则性、高度有着限制要求,通过单向推力(单自由度)和扭转修正(放大系数)来模拟和简化计算抗震力。而模态法(本文后面都这么称呼方法2)则是多自由度的,把整体结构拆成多个独立的振动模型,分别计算,然后选择不同的组合方法组合不同振型的贡献。

模态反应谱的计算和组合,12.9.1.1给出了组合前如何对不同振型进行调整,用于计算层间位移、支座反力及构件的内力时需要的设计参数,当用于复核构件强度(如构件的剪力、弯矩时)需要除以折减系数R/Ie,当用于复核正常使用的位移(如层间位移等)需要乘以放大系数Cd/Ie。不同的模态贡献要在组合前做好折减或放大的调整,而不能在组合后再折减,这个要注意。

12.9.1.3则给出了如何组合12.9.1.2计算出的数值,三种方法其实就是三种不同的数学组合方法,从名字就能看出来,不同的计算方式对应不同的计算假定和适用场景。其中说到,模态很接近或者存在显著相关性的情况下,一定要使用CQC(或CQC-4),而不能使用SRSS。

SRSS(开方平方和法)

The Square root of the sum of the square

适用于较规则的结构,无明显振型耦合情况(简单判断就是是否存在水平不规则1,但是相反不然)

CQC(完整二次组合)

The complete quadratic combination

1、不同模态周期接近(不同振型的周期比体现)

2、平动扭动有明显耦合情况

3、CQC-4用于特定复杂结构

CQC-4(ASCE-4调整版的完整二次组合)

其中CQC和CQC-4的触发条件是一样的,只是CQC-4是特殊版本,ASCE-4是《Seismic Analysis of Safety-Related Nuclear Structures》,常规的项目和结构用不上,除非核电项目或者业主明确要求吧,这里不做展开。

ELF作为第一振型的简化方法,提供了高阶振型和复杂动力情况的下限保证,所以,通过模态法计算出的基底剪力要和ELF计算的剪力进行对比缩放,这就是12.9.4的大方向。

Scaling of the forces

(保证modal法计算出的剪力不小于ELF计算出的数值)

Step1:当T>CuTa,则选用CuTa来替换T

Step2:用step1确定的T来计算V

Step3:用于强度计算时,要乘以(V/Vt)                  (保证用modal算出来的不保守于ELF的数值)

Scaling of the drifts

Step1:判断Vt<CsW(Cs使用12.8-7公式)

Step2:用于位移计算时,要乘以CsW/Vt

(保证用modal算出来的不保守于method2的数值)

12.9.1.5水平剪力分配,分配方法按12.8.4即同ELF的分配,偶然扭转通过施加静态力矩Mta考虑,并与12.9.1.4缩放后的的设计值进行组合。

正文还像人话,就是把静态力矩,我们看一下不像人话的exception:

Step1:判断是否存在不存在水平不规则1

Mta纳入动态模型,即不用想12.9.1.5的直接组合静力矩;就是使模态本身就包含偏心,进行模态计算

Step2:TIR≤1.6

(注意不是和step1矛盾,他们是流程的下一步)

继续往后算,也不用Ax放大

TIR>1.6

第一步虽然判断为不存在水平不规则1,但是现在有了,现在不规则了,放弃exception,回归12.9.1.5的静态法,且需要考虑Ax放大(按12.8.4.3)

是不是还没懂,什么时候用正文,什么时候用exception,其实简单来说就是正文的静力组合是通用钥匙,是保底的方法,exception是可以简化的方法,但是有苛刻的条件,如果达不到,还得回去正文。但是也是针对不出现水平不规则1的结构,如果你本身就不规则,那直接正文的方法。我感觉直接用正文方法吧,要不然还得来回验算也麻烦。

Modal法的P-Delta效应,正文中提及,按12.8.6和12.8.7计算,需要提醒大家的是,这里看起来好像和ELF法没区别,但是这里的V应该是上文进行复核或者缩放过的基底力和位移。

12.8.1.7节我就不展开了,12.9.1.8有个地方我觉得需要提及一下,就是建模要求,如果使用模态法时,即使是非刚性屋面,也需要显性3D建模,要通过shell单元赋予真实的面内剪切刚度,让其参与整体振动。

其实把,咱们普通的设计项目,搞定ELF和MODAL就够了,时程分析法除非遇到近断层高烈度的项目,而方法d的非线性法估计也用不咋到,就不做展开了,下面我感觉在学习一下12.10的部分内容就可以结合软件稍微来看一下实际模型怎么考虑地震力,大家敬请期待。本期完~

本期到此结束~

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  1. CONNECT:[ UseTime:0.000820s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001657s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002875s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000641s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001355s ]
  6. SELECT * FROM `set` [ RunTime:0.000541s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001527s ]
  8. SELECT * FROM `article` WHERE `id` = 465537 LIMIT 1 [ RunTime:0.000964s ]
  9. UPDATE `article` SET `lasttime` = 1770285881 WHERE `id` = 465537 [ RunTime:0.026446s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000262s ]
  11. SELECT * FROM `article` WHERE `id` < 465537 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000404s ]
  12. SELECT * FROM `article` WHERE `id` > 465537 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003310s ]
  13. SELECT * FROM `article` WHERE `id` < 465537 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002469s ]
  14. SELECT * FROM `article` WHERE `id` < 465537 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001128s ]
  15. SELECT * FROM `article` WHERE `id` < 465537 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001136s ]
0.121647s