MIDAS Structure Training Seriesnorthamerica.midasuser.com/web/upload/sample/...MIDAS Structure...
Transcript of MIDAS Structure Training Seriesnorthamerica.midasuser.com/web/upload/sample/...MIDAS Structure...
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SUBSTRUCTURE ANALYSIS
MIDAS Structure Training Series
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SUBSTRUCTURE ANALYSIS
ANGEL F. MARTINEZ
CIVIL ENGINEER
MIDASOFT
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CONTENTS
1. FOOTING DESIGN
2. PILE RAFT ANALYSIS & DESIGN
3. BASEMENT WALL ANALYSIS & DESIGN
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FOOTING DESIGN
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Dimensions18m
21m
14m
18m
14m
2.8m
21m
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Inspect Properties
• Material-Concrete ASTM C4000
• 3 rectangle Sections
• 1 thickness
H B
Column 0.45 m 0.6 m
Beam 0.4 m 0.35 m
Girder 0.3 m 0.2 m
Thickness
Wall 0.2 m
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Start file
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Boundary Conditions
• Assign fixed all SUPPORTS to bottom nodes (footing)
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Perform Analysis
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Results: Displacements
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Results: Axial Forces
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Results: Moments Y
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Results: Reactions
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Load combination
Generate Load ComboResults > Combinations > Concrete Design > Auto GenerationSelect Concrete Design and Footing DesignAuto GenerationDesign Code: ACI318-14 for both
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Footing Design: CODE CHECK
Select Node 20• Enter size 1.5X1.5X.35m• Enter allowable soil pressure : 300 kN/m^2• Rebar size #4 in X and Y• Surcharge Load 50 kN/m^2• CODE CHECK
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Footing Design: CODE CHECK
• CODE CHECK1.5mX1.5mX0.35m
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Footing Design: AUTO DESIGN
Select Node 20• AUTODESIGN
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Footing Design: AUTO DESIGN
• AUTO DESIGN2.3mX2.3mX0.4m
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PILE RAFT ANALYSIS
& DESIGN
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Dimensions
18m
20m
22m
10m
2.8m
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Inspect Properties
• Material-Concrete ASTM C4000
• 6 rectangle Sections
• 2 thickness
H B
C30X70 0.3 m 0.7 m
V35X50 0.35 m 0.5 m
B20X50 0.2 m 0.5 m
N10X25 0.1 m 0.25 m
Pile D = 0.5 m
C45X70 0.45 m 0.7 m
Thickness
Wall 0.2 m
Raft 0.3 m
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Start file
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Extrude PilesSelect column nodes to extrude pilesSelect pile SectionExtrude -1m in dz 10 times
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Auto-Mesh SlabSelect beams on the base by line elementsMesh size 1mThickness 0.3 m
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Boundary Conditions
• Select Pile Spring Supports and apply to piles
Soil Type: SandGround Level: 0mUnit weight: 2 tonf/m^3Ko: 0.4Kh: 800 tonf/m^3Friction Angle: 30 degK1: Dense
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Boundary Conditions
• Select Surface Springs and apply to raft
Point SpringKx: 80 tons/m^3Ky: 80 tons/m^3Kz: 800 tons/m^3
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Perform Analysis
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Results: Displacements
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Results: Axial Forces
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Results: Moments Y
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Load combination
Generate Load ComboResults > Combinations > Concrete Design > Auto GenerationSelect Concrete Design Auto GenerationDesign Code: ACI318-14
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Pile: Rebar Data
Select Piles• RC Design > Modify Column Rebar • Main #4• Ties/Spirals #3 @100
Add / Replace
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Pile: Code Check
Select All Piles• RC Design• Concrete Code Check• Column Check
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Pile: Code Check
1 member is NG: NOT GOODClick GRAPHIC to see PM Curve and details
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Pile: Code Design
Run Pile/Column Design
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Pile: Code Design
1. Click Re-CalculationPile rebar was redesigned based on code2. Click Update Rebar to see new rebar data created for pile
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BASEMENT WALL ANALYSIS
& DESIGN
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Dimensions
171 ft20m
14 m
19.6 m
5.6m
20m
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Inspect Properties
• Material-Concrete ASTM C4000
• 4 rectangle Sections
• 2 thickness
H B
V35X50 0.35 m 0.5 m
B20X50 0.2 m 0.5 m
N10X25 0.1 m 0.25 m
C45X70 0.45 m 0.7 m
Thickness
Slab and Wall 0.2 m
Basement Wall 0.3 m
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Start file
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Extrude PilesSelect column and slab corner nodes to extrudeSelect C45x70 SectionExtrude -2.8m in dz 2 times
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Auto-Mesh Basement WallsSelect node method: Draw rectangle by clicking 4 corners of side CCWMesh size 1mThickness 0.2 m
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Auto-Mesh Basement WallsDraw rectangle by clicking 4 corners of remainnig sidesMesh size 1mThickness 0.2 m
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Auto-Mesh SlabSelect 4 corner nodes of base as shownMesh size 1mThickness 0.3 m
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Boundary ConditionAdd Spring SupportsElement Type: PlanarSpring Type: LinearKx = Ky = 80 Kz = 800 ton/m^3Select bottom raft
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Boundary ConditionElement Type: PlanarSpring Type: Compression OnlyDirection: Normal +K = 800 ton/m^3Select basement walls in sequence
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Basement Loads
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Basement Loads
Apply Hydrostatic PressureLoad Case: Water pressure loadSelect Basement walls-1000kgf/m^3
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Lateral soil pressure with or without ground water pressure can be applied using this functionality.
NoteWhen lateral soil pressure is entered as Hydrostatic Pressure Loads, Element Type must be Plate, and the structure must be divided into a reasonable number of elements to properly reflect its flexural behavior.
Direction represents the direction of acting force. Gradient Direction is generally selected in the direction of gravity (Global-Z).
Constant Intensity (Po) represents surcharge (soil overburden), which is subject to soil pressure coefficient. Gradient Intensity (g) is also obtained by applying the soil pressure coefficient. Depending on the presence of ground water, the following is entered:
1) Only soil is present without ground waterSoil: g = soil pressure coefficient * unit density of soil
2) To consider ground water (separately enter values for soil and water)Soil: g = soil pressure coefficient * unit density of soil under waterWater: g = unit density of water(In case of water, Reference level (H) locates the level of ground water.)
Sand with gravel, dry
1650 (kg/m3)
Sand with gravel, wet
2020 (kg/m3)
Earth Pressure Coefficient
1
Surcharge Po 600 (kg/m^3)
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Basement LoadsApply Hydrostatic PressureLoad Case: earth pressureSelect Basement walls-600 kgf/m^2 constant intensity-2020 kgf/m^3 gradient intensity
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Load combination
Generate Load ComboResults > Combinations > Concrete Design > Auto GenerationSelect Concrete and DesignAuto GenerationDesign Code: ACI318-14
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Perform Analysis
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Results: Deformations
Check Deformations
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Results: Axial Plate Forces
Check Axial Forces
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Results: Soil Pressure
Check Vertical Soil Pressure
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Slab and wall load combinations
Slab/Wall Load Combination • Select the load combinations for the slab/wall element design.• Design > Design > Meshed Design > Slab/Wall Load
Combinations
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Define Design Criteria for Rebar
Specify rebar size• Enter the standard sizes of rebars used in the design of reinforcement
for slab/wall elements.• Design > Design > Meshed Design> Design Criteria for Rebar• Check off [Basic Rebar for Slab]• For Slab Design:
Dir. 1 : 0.03 m, 0.03 m Dir. 2 : 0.05 m, 0.05 m
• For Wall DesignFace to Center Rebar 0.02m
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Slab/Wall Rebar Checking Data
Specify rebar size• Select all 0.3m slab from tree menu• Layer Top Dir 1• Add Rebar 1: #3 @ 100• Add Rebar 2 #3• Add/Replace
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Slab/Wall Rebar Checking Data
Specify rebar size• Select all 0.2m walls from tree menu• Layer Top Dir 1• Vertical 1: #3 @ 100mm• Horizontal 2: #3 @ 100mm• Add/Replace
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Slab Flexural Design
Run DesignSelect Avg. NodalDir. 11. Select Rebar Ratio > Apply2. Click: Update rebar
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Slab/Wall Rebar Checking Data
Rebar UpdateNew sets of reinforcement were automatically created for parts of slab
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Wall Design
Run Design Specify Design Criteria1. Select Rebar Ratio > Apply2. Click: Update rebar