EARTHQUAKE-RESISTANT DESIGN

Question 1

Criteria for earthquake-resistant design

Answer 1

• Function
• Cost
• Reliability

Question 2

Determination of Structural Form

Answer 2

• be simple
• be symmetrical
• not be too elongated in plan and elevation
• have uniform and continuous distribution of strength
• have horizontal members which form hinges before the vertical members
• have its stiffness related to the sub-soil properties

Question 3

Causes of damage of earthquake

Answer 3

• inadequate resistance to horizontal ground shaking
• soil amplification
• permanent displacement (surface faulting and ground failure)
• irregularities in elevation and plan
• tsunami wave runup
• lack of detailing and poor construction materials
• lack of attention to non-structural elements

Question 4

Analysis due to earthquake

Answer 4

• Location
• Structure type and framing system
• frame analysis
• combine forces

Question 5

Analysis due to earthquake - location

Answer 5

• zone
• seismic source type
• distance from source
• soil parameters

Question 6

Analysis due to earthquake - structure type and framing system

Answer 6

• importance factor
• height
• configuration
• period
• near source factor (Na and Nv)
• lateral force procedure

Question 7

Analysis due to earthquake - frame analysis

Answer 7

• base shear
• lateral force distribution
• stresses
• drift
• P-delta effects

Question 8

Analysis due to earthquake - combine forces

Answer 8

• earthquake load
• live load
• dead load

Question 9

Philippines

Answer 9

lies in subduction zone between Eurasian plate and Philippine sea plate

Question 10

moving northwestward pushing Philippine sea plate about 7cm/year

Answer 10

Pacific plate

Question 11

subducting the western side of Luzon and Mindoro by 3cm/year

Answer 11

Eurasian plate

Question 12

to safeguard against major structural failures and loss of life not to limit damage or maintain fuction

Answer 12

Purpose of earthquake provisions of NSCP

Question 13

Code philosophy of Earthquake provisions of NSCP

Answer 13

Assure life safety

Question 14

Structure MUST be able to:

Answer 14

• Resist minor earthquake without damage
• Resist moderate earthquake without structural damage but possibly with non-structural damage
• Resist major earthquakes without collapse but possibly with structural and non-structure damages

Question 14

Building occupancy not more than 3 story in height excluding basements that use light frame construction

Answer 14

SIMPLIFIED STATIC LATERAL FORCE PROCEDURE

Question 14

Other buildings not more than 2 story in height excluding basement

Answer 14

SIMPLIFIED STATIC LATERAL FORCE PROCEDURE

Question 15

Regular structures under 75 m in height

Answer 15

STATIC LATERAL FORCE PROCEDURE

Question 16

All structures regular or irregular in category 4 or 5 in zone 2

Answer 16

STATIC LATERAL FORCE PROCEDURE

Question 17

Irregular structures not more than 5 story or 20 m in height

Answer 17

STATIC LATERAL FORCE PROCEDURE

Question 18

Structures 70 m or more in height

Answer 18

DYNAMIC LATERAL FORCE PROCEDURE

Question 19

Structures with stiffness, weight or geometric irregularities

Answer 19

DYNAMIC LATERAL FORCE PROCEDURE

Question 20

With over five story or 20 m in height in zone 4 not having the same structural system throughout their height

Answer 20

DYNAMIC LATERAL FORCE PROCEDURE

Question 21

Regular or irregularities located in Sf that have a period greater than 0.70s

Answer 21

DYNAMIC LATERAL FORCE PROCEDURE

Question 22

Damages to foundations in earthquakes

Answer 22

• soil damage
• foundation damage
• flexure damage
• shear damage
• faulting