TY - JOUR
T1 - Relationship between probability of breakage to maximum principal stresses in window glass
AU - Morse, Stephen
AU - Norville, H
PY - 2010/3/1
Y1 - 2010/3/1
N2 - Currently, the ASTM design methodology to determine the load resistance of annealed window glass incorporates a probability distribution to model glass load resistance. A probability of 8 lites per 1000 broken at the first occurrence of the design load was selected to match a load resistance consistent with a historical design factor of 2.5. The historical use of a factor relationship leads to the misconception that the design methodology follows an allowable stress procedure. The misconception has led to another common misconception among architects and engineers that a constant maximum principal stress exists, associated with the load resistance for any combination of lite thickness, aspect ratio, and surface area. This paper presents a relationship between the maximum principal stress in glass lites associated with their design loads for a probability of breakage of 8 lites per 1000. The relationship clearly shows that the maximum principal stress is not constant for a single
AB - Currently, the ASTM design methodology to determine the load resistance of annealed window glass incorporates a probability distribution to model glass load resistance. A probability of 8 lites per 1000 broken at the first occurrence of the design load was selected to match a load resistance consistent with a historical design factor of 2.5. The historical use of a factor relationship leads to the misconception that the design methodology follows an allowable stress procedure. The misconception has led to another common misconception among architects and engineers that a constant maximum principal stress exists, associated with the load resistance for any combination of lite thickness, aspect ratio, and surface area. This paper presents a relationship between the maximum principal stress in glass lites associated with their design loads for a probability of breakage of 8 lites per 1000. The relationship clearly shows that the maximum principal stress is not constant for a single
U2 - 10.1061/(ASCE)1076-0431(2010)16:1(20)
DO - 10.1061/(ASCE)1076-0431(2010)16:1(20)
M3 - Article
SP - 20
EP - 28
JO - Journal of Architectural Engineering, ASCE
JF - Journal of Architectural Engineering, ASCE
SN - 1076-0431
ER -