The document outlines the design process for a four-story building using reinforced concrete, detailing steps such as determining the seismic zone factor, soil profile type, occupancy categories, and response modification factors. It includes calculations for base shear, lateral forces, and floor weights based on the building's dimensions and parameters. The final calculations indicate that the total weight and forces for the structure lead to specific design considerations for seismic response.

1. Reinforced Concrete Design-II
Lecture 26: Equivalent lateral static procedure
Semester – Fall 2020
Dr.Tahir Mehmood

2. 2
Case study Building
 Case study building compose of 4 stories
 Story height is 3.5 m
 Total height is 14 m
 All stories are to be designed as beam-slab
system

3. 3
Step 1: Determine Seismic Zone Factor Z
Step 2 : Determine Soil Profile Type

4. 4
Step 3: Determine the Occupancy Categories and Importance Factor I

5. 5
Step 4: Classify the Structural System and determine the Response Modification Factor R

6. 6
Step 5: Determine Ground Response Coefficients and

7. 7
Step 6a: Determine Fundamental period T
𝑇𝑎=0.0488 (143/ 4
) =0.353 Sec

8. 8
Step 6b: Calculate time-period by FE model
𝑇𝑥=0.287 𝑆𝑒𝑐
Since Tx<Ta So select time period Tx=0.287 Sec

9. 9
Step 7: Determine the Seismic Response Coefficient
= 0.1845
𝐶 𝑠=
𝐶 𝑣 𝐼
𝑅 𝑇
𝑉 = 𝐶 𝑠 𝑊
Step 8 Determine the Base Shear
x8400 =1549.8 KN
One story weight = 2100KN

10. 10
But V can not exceed by following Equation
=815.3 KN
=304.9 KN
Remember that:

11. 11
Step 8: Vertical Distribution of Base Shear into Lateral Forces
Ft = 0 Since Tx =0.287 ( Ft =0 for T<0.7 sec)
= (2100x14)+(2100x10.5)+(2100x7)+(2100x3.5) =73500 KNm
V= 815.3

12. 12
Floor Weight ),KN ,m Force (KN)
4th
2100 14 29400 0.4 326.12
3rd
2100 10.5 22050 0.3 244.59
2nd
2100 7 14700 0.2 163.06
1st
2100 3.5 7350 0.1 81.53
8400 73500 1 815.3

13. 13
326.12 KN
244.59 KN
163.06 KN
81.53 KN

14. Thank you