كيف يمكنك تحديد أقصي حمل وعزم للعمود والكمره


(hosamelbakry) #1

أريد إجابه هذا السؤال سريعا جدا


(judii80) #2

حسب الكود البريطاني BS8110:PART1:1997
1-بالنسبة للكمرة :

A- DETERMINE THE NETURAL AXIS DEPTH USING THE EQUILIBRIUM EQUATION

T = C i.e TENSION = COMPERSSION
T=0.95fy*As
C=0.45fcub*0.9X
0.95fyAs = 0.45fcub0.9X

B- COMPUTE LEVER ARM Z

Z= d - 0.45X

C- COMPUTE ULTIMATE MOMENT OF RESISTANCE

Mu = CZ = TZ


(judii80) #3

بالنسبة للعمود:

A- IF THE COLUMN CARRY AXIAL LOAD ONLY

USE EQUATION (28) BS8110

N = 0.4fcuAc + 0.8fyAsc

B- IF COLUMN IS SHORT BRACED SUPPORTING AN APPROXIMATELY SYMETRICAL ARRANGEMENT OF BEAMS

[B][FONT=Arial][COLOR=red]
USE EQUATION (28) BS8110

N = 0.35fcuAc + 0.7fyAsc

C- BY USING COLUMN CHARTS (BS8110: PART3)FROM END TO FIRST
i- CALCULATE THE PERCENTAGE OF REINFORCEMNET = As/bh
ii- CHOOSING SUITABLE CHART; DEPEND ON fcu, fy, d/h
iii- THEN PERCENTAGE OF REINFORCEMENT PLOT AS CURVE
iv- EACH POINT LIES IN THIS CURVE GIVE PROBABLE VALUE FOR BOTH AXIAL LOAD AND MOMENT M

MOMENT
i- IF COLUMN UNDER UNI-AXIAL MOMENT THEN MOMENT OF CAPACITY = M
i- IF COLUMN UNDER BAIAXIALL MOMENT MANY CONSIDERADITON MUST BE IVESTIGATED . REFER TO BS8110 CL 3.8.4.5

NOTE

SPECIAL CONSIDERATION MUST BE TAKEN INTO ACCOUNT IN THE CASE OF SLENDER COLUMN CL 3.8 BS 8110

[/color][/font][/b]

(hosamelbakry) #4

جزاكم الله خيرا أخي علي ردك