Design of Seismic Resistant Steel Building Structures-Concentrically_Braced_Frames
Design Considerations for Seismic Resistant Structures in Sabah
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Transcript of Design Considerations for Seismic Resistant Structures in Sabah
DESIGN CONSIDERATIONS for Seismic Resistant Structures in Sabah
12/01/15
Briefing prepared by: Ir. Simon SK GOH & TeamWANG HARON & GOH SDN. BHD.http://whgsabah.com Fb.com/whgsabah
INTRODUCTION
12/01/15
GEOLOGY
Sabah Fault Lines nearest to Kota Kinabalu
About 58 km away at the Ranau/Kundasang area
The red lines denote the active Fault lines
FREQUENCY OF SEISMIC ACTIVITYFirst recorded in 1966 at a magnitude of 5.3 on the Richter scale in Ranau
1976 at a magnitude of 5.8 on the Richter scale in Lahad Datu
Last recorded in 1991 at a 5.4 magnitude tremor in the same area in Ranau
Recently, two active faults have been recognized at Ranau/Kundasang area
–Lobou-Lobou Fault, left-lateral strike-slip, trending N20oE
–Mensaban Faults, normal-oblique, striking WNW-ESE
EARTHQUAKE INTENSITY SCALERichter Scale (Magnitude) Modified Mercalli Intensity (MMI)
1.0 – 3.0 I
3.0- 3.9 II- III
4.0- 4.9 IV - V
5.0- 5.9 V-VI
6.0- 6.9 VI-VII
7.0- 7.9 VII- VIII
8.0 or Higher VIII or Higher
I = Not Felt II- III = Weak
VI= StrongVII = Very Strong
IV= LightV = Moderate
VIII = Destructive
I = Not Felt II- III = WeakIV = LightV = ModerateVI = StrongVII = Very StrongVIII = Destructive
Mercalli Intensity scale (MMI)
FACTORS AFFECTING SEISMIC DESIGN FORCES
• Ground acceleration
• Epicenter distance from a fault
• Site Geology
• Types of lateral load resisting system of structures
BASIC PRINCIPLES OF SEISMIC DESIGN
1. Structural Simplicity
2. Uniformity, Symmetry and Redundancy
3. Bi-directional Resistance and Stiffness torsional resistance and stiffness
4. Diaphragmatic Behavior
5. Adequate Foundation
SEISMIC RESISTANCE DESIGN CODES1. Design to EuroCode (EC8) based on ground conditions type and
seismic action zoning
2. Increase dead and imposed loads by 20% to allow for vertical movement
3. Increase Horizontal notional load from basic 1.5%g (deadweight)
4. Base Isolation System
COST IMPLICATION
1. Bigger columns / Shear wall
2. Increase in reinforcement
3. Foundation and Additional Tie-beams and foundation slab
4. Detailing for local ductility
5. Panel Walls, Finishes and ornaments to be permanently attached to the frame
RECENT EARTHQUAKE FACTS
Date: 5 June 2015 (Friday)
Origin time 07:15:43 MST
Duration: 30 seconds
Magnitude: 6.0 (Mw) (USGS)
5.9 (Mw) (MetMalaysia)
Depth 10.0 km (6.2 mi)
Epicentre 5.980°N 116.525°E
RECENT EARTHQUAKE FACTS
12/01/15
Areas affected: West Coast & Interior Division (Mount
Kinabalu area), Sabah, East Malaysia
Total damage: Building and infrastructure damage,
landslides & geological changes
Max. intensity: VII (Very Strong)
RECENT EARTHQUAKE FACTS
12/01/15
EPICENTRE:
KOTA KINABALU:
DO WE DESIGN FOR SEISMIC RESISTANCE?
1. “National Annex MS EN Standard EuroCode 1998 on Earthquake” – scheduled to be ready middle 2015?? When will it be adopted?
2. 11th June, 2015 – Newspaper reported IEM is working with SIRIM to develop a standard for Earthquake Resistant Buildings in Sabah Based on (Peak Ground Acceleration) PGA of 0.05g calculated for Kota Kinabalu based on 5Jun Quake
3. Malaysia is within low and moderate seismic region.
DO WE DESIGN FOR SEISMIC RESISTANCE? 4. What are the parameters to be
considered to Seismic Design ? a. Sub – Soil Profile b. Peak Ground Acceleration (PGA) c. Importance Classes for Buildingsd. Elastic Response Spectrae. Frequency Content of the Motion
DESIGN CONSIDERATIONS for Seismic Resistant Structures in Sabah
Briefing prepared by: Ir. Simon SK GOH & TeamWANG HARON & GOH SDN. BHD.http://whgsabah.com Fb.com/whgsabah
Thank you