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ASCE 7-22设计学习笔记第四期

  • 2026-02-03 12:50:16
ASCE 7-22设计学习笔记第四期

学习12.8章内容(上)

本期开始就着重学习12.6提及的方法(a)。

(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

方法(a):等效剪力法ELF12.8节

美标抗震设计中最基础也最常用的分析方法就是ELF,第一个关键公式就是开篇的12.8-1:

W我们上一期有提及,Cs地震响应系数的计算就是本节的关键。地震响应系数由地震反应谱加速度Sa、SDS、SD1、地震力调整系数R、结构基本周期T、建筑重要性系数Ie决定。7-22提出了一个新的计算方法Method 1,我们可以对比一下模型里,7-16和7-22的界面:

Method 1中需要的地震谱加速度值Sa对应的就是11章新增的多周期反应谱中提出的Sa,多周期反应谱可以通过USGS提供的多周期地震危险性数据库(提供了0~10s的连续谱值),同时也配合21章更精细的场地分类,可以直接获取这个地震加速度Sa,这个方法我觉得就是为了推广USGS,或者换句话说,为了推广新一代的地震模型,而不是两段式反应谱的0.2s和1s的插值,但是我们大多数设计师,如果只是出海设计业主认可美标,而不是做正经老美地区的项目,是用不上多周期反应谱和12.8的method 1的。或许老美也是在倒逼各国升级自己的地震数据库。

地震响应系数计算公式:

Method 2其实大部分就是7-16里12.8的内容,对应的是两段式地震反应谱,

地震响应系数计算公式:

Cs的上限不得超过:

Cs的下限不得超过:

限制上下限的原因也就是为了避免在趋近于0的极短周期,公式2中计算得到的响应系数出现不合理的较大值或者较低值,而对于周期较长的(极长周期)柔性结构或者超高层的地震力过小,这也是不合理的。

同时也对SDS提出了简化和限制,在满足下面所有的条件的情况下:

SDS用于计算=min{1.0,2/3SMS}·g并且≥0.7*2/3SMS·g

简单理解就是当出现高烈度地区,算出的SDS过大,可以简化为1.0g进行计算,但是如果过大,比如1.5g,也不是取1.0g进行计算,是取1.5*0.7=1.05g进行计算,注意逻辑关系。

仔细看限制条件,可以放宽的是无不规则性,不超过五层的中低层建筑,满足1.0冗余系数,不是软土等特殊土并且风险较低的普通建筑,同时延性要求不小于3(7-22新增条款),很严格,必须全部满足,也就是规整、简单低风险的结构才可以使用这个优惠,使用后荷载能一下子小很多,经济性提高显著。

一般我们会用软件计算结构的自振周期T,但是规范给了一个周期上限的影响系数Cu和近似周期Ta,两者的乘积用来替换模型计算出来的T,或者直接使用近似周期Ta来替换T,读起来其实有点绕,但是可以这么理解:

方法一:T=min{T计算,Cu×Ta}

要去计算取比较取小值

方法二:Ta

不用算,直接取近似值

Ta:approximately fundamental period近似自振周期,通过下面的三种计算方式来计算确定:

方法一(最常用的也简便,按体系直接选取即可):

其实就是不同的结构体系对应的Ct和x

钢框架:Ct=0.028;x=0.8

砼框架:Ct=0.016;x=0.9

EBF/BRBF:Ct=0.03;x=0.75

其他所有体系:Ct=0.02;x=0.75

方法二(限制条件是,不超过12层,且每层层高不小于3m):

方法三(用于高度不超过36.6m的混凝土剪力墙或砌体结构):

Cu:the coefficient upper limit on calculated period周期计算上限影响系数,不同的1s周期的反应谱加速度对应不同的Cu限制:

行文至此,怎么计算基底力的准备工作都做完了,下面就是如何垂直分配算出的水平地震力了,把力传递给各个楼层,和各个抗侧力构件,我们12.8(下)见

本期到此结束~

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  1. CONNECT:[ UseTime:0.000473s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000774s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000272s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000760s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000569s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000556s ]
  8. SELECT * FROM `article` WHERE `id` = 464871 LIMIT 1 [ RunTime:0.000389s ]
  9. UPDATE `article` SET `lasttime` = 1770275576 WHERE `id` = 464871 [ RunTime:0.013473s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000369s ]
  11. SELECT * FROM `article` WHERE `id` < 464871 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000702s ]
  12. SELECT * FROM `article` WHERE `id` > 464871 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000401s ]
  13. SELECT * FROM `article` WHERE `id` < 464871 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004902s ]
  14. SELECT * FROM `article` WHERE `id` < 464871 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003859s ]
  15. SELECT * FROM `article` WHERE `id` < 464871 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000970s ]
0.099200s