Seismic AnalysisProcedure 2

SEISMIC COEFFICIENT METHOD USING MEMBER WEIGHT

STEPS INVOLVED: 1. Creation of Geometry 2. Giving Member Property 3. Support Condition 4. Giving Loads : Load 1: DL Load 2: LL 5. Specifying Analysis Type 6. Post Analysis Print 7. Design 8. Analysis. (1) In this complete steps 1 to 4. Then follow the further steps for Member Weight. There are two parts. Part 1 :. Define Seismic Load Part 2: Applying Defined Seismic Load,

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  Add 3. IS1893-2002 Seismic Parameter screen will appear. Select city or Zone. One 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) for all soils Stiff soil N> 15 for poorly graded, among other

descriptions) : 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): Depth of Fcloundation (DT) (For under ground structures) : 2.0m

□

Generate  Add  Close.

3. Click Z=0.16 RF 5 I 1.5 SS 3 ST 1 DM 0.05 DT 2.55 Add.

Seismic Definitions screen will appear.

Self weight  Self weight

 Add.

Member weight  Loading type UNI : Weight =12 KN/m  Add.

Floor weight  Load pressure : 4 KN/m Define Y range Minimum: ---

Maximum :--- 

Add  Close.

5. Select Member weight Select beam parallel to  x and select beam parallel to z   Assign to selected beam  Assign  Yes.  Close. 2.APPLYING SEISMIC LOAD: 1. Click Load case details in the Data Area Add.

Number: 1

Loading Type: Seismic

Tittle : 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

Tittle : Seismic X -ve  Add. Click Load Case 2  Add Seismic Load

 X Direction. Factor:- 1  Add.  Close.

3. Click Load case details in the Data Area Add. Number: 3

Loading Type: Seismic

Tittle : Seismic Z +ve  Add. Click Load Case 1  Add Seismic Load

 Z Direction. Factor 1  Add.  Close.

4. Click Load case details in the Data Area Add.

Number: 4

Loading Type: Seismic

Tittle : Seismic Z -ve  Add. Click Load Case 4  Add Seismic Load

 Z Direction. Factor:- 1  Add.  Close.

OTHER LOAD CASES: To Create DEAD LOAD: 5.Click Load case Details  Add. Number 5 Loading Type: DEAD. Title: Dead Load  Add. Click Load case 5 Add. Selfweight Factor:-1 Direction  Y  Add. Click load case 5 Add.

Member Load  Uniform Force

 GY direction.

W1 =-12 (9” wall load)  Add. W1=-6 (4½” wall load)  Add. Floor load Pressure =-3.5(selfweight+Floor finish) Define Y range Mini.= ---- Max. = --Define X range Mini.=0 Max.=--Define Z range Mini.=0 Max.=---  Add  Close. 6.Click Load case details  Add Number :6 Loading type : Live Tittle : Live Load  Add. Click Load case 6 Add. Floor Load Pressure=-2 (Live load for residential building) Define Y range Mini.= -- Max. = --Define X range Mini.=---

Max.=--

Define Z range Mini.=0

Max.=10.36  Add  Close. After completing the all loads, edit the Seismic Member Weight and Floor Weight as per actual. Main menu  Edit  Edit input Command file

Zone below: SELFWEIGHT MEMBER WEIGHT

Delete the existing member weight value and Copy and Paste the actual member weight in Dead Load case with following changes: (i)

Change the Member load to Member Weight.

(ii) The – ve sign changed to +ve sign. Gy to be deleted. FLOOR WEIGHT Delete the existing floor weight. Copy and paste the actual load under Dead Load and Live load with following changes: (i)

Floor Load shall be changed to Floor weight.

(ii) The –ve sign changed to +ve sign. GY to be deleted. (iii) The Live Load may be reduced to 0.25 LL if LL 3KN/m2. (iv) The Live Load on the roof slab to be deleted.

LOAD COMBINATION: 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

1.5

2. EQX-ve

>>

1

1.5

3. EQZ+ve

<

4. EQZ-ve



Load Comb

2. EQ X-ve

>>

7 to 19

3. EQ Z+ve

<

4. EQ Z-ve.