Chapter 6 - Seismic Shear

Question 1

formula for diaphragm reactions

Answer 1

rd = ws*L/2

Question 2

formula for maximum shear in flexible diaphragms

Answer 2

vmax = ws&L/2

Question 3

what else is the unit shear wall called?

Answer 3

also called a unit wall shear or distributed wall shear

Question 4

what is the direct shear?

Answer 4

story shear force acting in the x or y direction

Question 5

what else is the direct shear known as?

Answer 5

the shear not considering torsion

Question 6

what is torsional shear?

Answer 6

torsional shear is a force resulting from the rotation of the rigid diaphragm about center of rigidity

Question 7

what is a diaphragm?

Answer 7

a horizontal element of SFRS that is thin and large which distributes its reaction to supporting vertical elements

Question 8

what is a chord?

Answer 8

element of the diaphragm that is perpendicular to the lateral forces

Question 9

what is a collector?

Answer 9

element of the diaphragm that is parallel to the lateral forces

Question 10

is the formula for Cs the same for diaphragms as it is for buildings?

Answer 10

it is similar but different. you use Sa instead of SDS

Question 11

what weight contributes to the weight of the diaphragm?

Answer 11

contributing wall elements which are perpendicular to the force

Question 12

structure irregularities increase the diaphragm design forces by how much?

%

Answer 12

25%