Descripción: Staad pro-earth quake Analysis using Lumped mass method
Seismic ANalysisFull description
seismic analysisFull description
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Descripción completa
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Manual book how to process seismic data using promax feature
This report presents a summary of the current state of seismic analysis and design for underground structures. The report describes approaches used by engineers in quantifying the seismic effect. ...
Performance based design explicitly evaluate how a building is likely to perform given the potential hazard it is likely to experience , considering uncertainties inherent in the quantification of potential hazard and uncertainties in assessment of t
Manual book how to process seismic data using promax featureFull description
Full description
SEISMIC ANALYSIS ANALYSIS USING USING LUMPED MASS METHOD METHOD Create the Geometry of the model and give member property. Provide all beam and column junctions as hinged and create a load case [i.e. DL+50%LL or or 25%LL as per per Code IS 1893 (Part 1) -2002] Then run analysis and view the result w.r.t the already created load case. Go to reaction reaction tab and copy copy the reactions reactions to the excel sheet. Delete the all the unwanted columns [ Fx, Fz, Mx, My…] Let nodes, nodes, load case and Fy Fy column retained Replace the load case column fully by Joint weight. Copy and paste it in the staad editor. Done… Detailed Procedure : STEPS INVOLVED: 1. Crea Creati tion on of of Geom Geomet etry ry 2. Giving Giving Member Member Proper Property ty 3. Su Supp ppor ortt Con Condi diti tion on 4. Givi Giving ng Load Loadss : Load 1 Dead Load Load 2 Live Load Load Comb 3 5. Specif Specifyin ying g Anal Analysi ysiss Typ Type e 6. Post Post An Anal alys ysis is Prin Printt 7. Design 8. An Ana alysi lysiss. (1) In this complete steps 1 to 6. Then follow the further steps for Lumped Mass. There are two parts. Part 1 : Finding Joint Loads for Earth quake analysis. Part 2: Applying Earthquake analysis. Before Proceeding take a copy of Model created from step 1 to 6.
Part 1: To find Joint Loads:
1.To give pinned supports at all column nodes : Main menu
‡
Select ‡ Beams parallel to
‡ Y
Main menu‡ View ‡ View selected objects objects only.
Main menu‡Commands ‡Support specifications
‡
Pinned
‡ Assign.
2. Apply Load: (1) In Seismic Load for finding joint load we have to consider the following Load case as per Table 8 (Clause 7.3.1 ) of IS 1893-2002. 1.0DL+0.25LL
(If LL<3KN/m2)
1.0DL+0.50LL
(If LL>3KN/m 2)
Main menu
‡Edit ‡Edit
input command file ‡
In Load case below Live Load type the following: Load Combination 3 1 1 2 0.25 Perform Analysis Load List 3 Print Support Reaction (2) Main Menu‡ Analysis (3) Main Menu‡ View
‡
Run Analysis
‡Done.
‡Tables ‡ □ Support
Reaction.
From support reaction Select only Joint No. and Force FY. Copy and Paste the Joint No. and vertical reaction at the pinned supports in a separate file named as “Joint Load “file. Type Weight in between Joint No. and Force Fy as below: (E.g) 16 WEIGHT 81.47 Close the File. Part 2 : Applying Earthquake Analysis: Go to original file of Model created from step 1 to 6. Then follow the steps
below: DEFINING SEISMIC LOAD: 1. Main menu
‡
Commands‡ Loading ‡ Definitions‡Seismic Load‡
IS1893-2002
2. Seismic Parameter screen will appear. Select type:IS1893-2002.
□ Include
Accidental Load
□ Generate
.
3. IS1893-2002 Seismic Parameter screen will appear. Select city or Zone. For Zone III Z=0.16 (Table 2 IS1893-2002) Response Reduction Factor (RF) : (Table 7 IS1893-2002) : 5 for SMRF : 3 for OMRF Importance Factor (I)
: (Table 6 IS1893-2002) : 1 for Ordinary Residential Building : 1.5 for Important Building
Other Factors: Rock or Soil sites Factor (SS) : (Clause 6.4.5 of IS1893-2002) : 1 for hard soil (N>30) : 2 for medium soil (10 ≤ N
≤ 30)
: 3 for soft soils (N< 10) Type of Structure (ST) (Optional) : (Clause 7.6 IS1893-2002) =1 for RC Frame Building = 2 for Steel Frame Building = 3 for all other Building Damping Ratio (DM) (Table 3 IS1893-2002): 0.05% PX =Period in X Direction (Optional): PZ =Period in Z Direction (Optional):
□ Generate ‡ Add ‡
Close.
for all soils.
4. Go to “ Joint Load” file .Copy the Joint Weight and apply them as Seismic Weights. For this go to Main menu
‡Edit‡
Edit Input Command file.
Below the Zone factor, copy and paste the JOINT WEIGHT as in the Joint Load file.
1. Edit the Load case No.1 (Dead Load) and 2(Live Load) as Load case No. 5 & 6. 2. APPLYING SEISMIC LOAD: (1) Click Load case details in the Data Area
‡ Add.
Number: 1 Loading Type: Seismic Title : Seismic X +ve
‡ Add.
Click Load Case 1
‡ Add
Seismic Load
X Direction. Factor 1
§
‡ Add. ‡
Close.
(2) Click Load case details in the Data Area
‡ Add.
Number: 2 Loading Type: Seismic Title : Seismic X -ve
‡ Add.
Click Load Case 2
‡ Add
Seismic Load
X Direction. Factor:- 1
§
(3) Click Load case details in the Data Area Number: 3 Loading Type: Seismic
‡ Add. ‡
‡ Add.
Close.
Title : Seismic Z +ve
‡ Add.
Click Load Case 1
‡ Add
Seismic Load
Z Direction. Factor 1
§
‡ Add. ‡
(4) Click Load case details in the Data Area
Close.
‡ Add.
Number: 4 Loading Type: Seismic Title : Seismic Z -ve
‡ Add.
Click Load Case 4
‡ Add
Seismic Load
Z Direction. Factor: - 1
§
‡ Add. ‡
Close.
LOAD COMBINATION: Main menu
‡
Load Combinations ‡
Loading No.7 Name: 1.5(DL+LL) Default: 1.5 Available Load case
Load
Factor
cases 1. EQX+ve
>
5
1.5
2. EQX-ve
>>
6
1.5
3. EQZ+ve
<
4. EQZ-ve
<<
5. DL 6. LL
Add‡ Loading No.8
Name: 1.5(DL+EQX+ve) Default : 1.5
Available Load case
Load
Factor
cases 1. EQX+ve
>
5
1.5
2. EQX-ve
>>
1
1.5
3. EQZ+ve
<
4. EQZ-ve
<<
5. DL 6. LL
Add‡ In the similar way add the following load combination. Load case No.
9
10
11
12
13
14
15
16
Load case
Factor
5
1.5
2
1.5
5
1.5
3
1.5
5
1.5
4
1.5
5
1.2
6
1.2
1
1.2
5
1.2
6
1.2
2
1.2
5
1.2
6
1.2
3
1.2
5
1.2
6
1.2
4
1.2
5
0.9
1
1.5
17
18
19
Add
‡
5
0.9
2
1.5
5
0.9
3
1.5
5
0.9
4
1.5
Close. (OR)
AUTO LOAD COMBINATION Main menu
‡
Commands
‡
Loading
‡Edit
Auto Loads
‡
Select Indian
Code Select : New category say EQ No. of rule :4 Rule No.
Dead
Live
Seismic
1
1.5
1.5
--
2
1.5
--
1.5
3
1.2
1.2
1.2
4
0.9
---
1.5
Click Update Table
‡Close.
Click Load case details
‡
Add
‡
High light Auto Load Combination (in left
side). Select
:
Category:
I ndian code EQ
‡
Generate loads‡Add‡ Close.
Main menu‡Commands ‡Loading‡ Load List (selecting Design loads)
Design ‡Concrete ‡Current code IS 456 ‡Define Parameters
2
‡Fc=30,000KN/m
‡ Add.
Fysec=415,000KN/m2
Fymain=415,000KN/m2
‡Add.
‡Add.
Ratio=3% ‡Add.
Click Command‡Design Beam
‡Add.
Design Column
‡Add.
Take
off ‡Add‡Close. Click Fck=30,000KN/m2 and select the entire structure
Assign to
‡§
selected Beam‡ Assign ‡ Yes. Click Fymain=415000KN/ m2 and select the entire structure
‡§
Assign to selected beam ‡ Assign ‡ Yes. Click
Fysec=415000KN/m 2 and select the entire structure selected beam‡ Assign structure Beam §
‡§
‡ Yes.
Assign to
Click Ratio=3% and select the entire
Assign to selected beam ‡ Assign ‡ Yes. Click Design
‡Select‡Beam
parallel to
‡X
Assign to selected beam‡ Assign
‡
‡§
and Beam parallel to
‡ Yes
‡Z‡
. Click Design Column‡Select
Beam parallel to Y‡§ Assign to selected beam ‡ Assign ‡ Yes
Take off
‡
Assign
‡
Close.
Note: Save the File and Run the Program.
‡
STEP 8 (Analysis):
From Main Menu
‡
` Analysis
‡
Run Analysis
Select the member and double click on it
‡
‡
Run Analysis
Shear bending
‡
‡
Done.
Close.
NOTE: This procedure is very useful in the older version of Staad Pro due to the fact that in the OLDER version, load list in load cases differ from the load list in load definition. In the latter version of Staad Pro 2007, you can just copy paste the loads from the load cases to the seismic definition and let Staad will do the entire process of analysing weights but of course there is a need to carefully change some load name, e.g. instead of floor load that will be floor weights Member Load will be Member weight etc. It's much easier. This method of analyzing Earthquake analysis separately.
