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- W792355213 abstract "THE PROBLEMS OF SAFETY DESIGN AND THE SAFETY FACTOR IN EXCAVATIONS AND FOUNDATIONS ARE DESCRIBED AND DISCUSSED. A MAJOR COMPONENT OF THE MARGIN FOR SAFETY LIES IN THE MARGIN OF UNCERTAINTY OF FUTURE MODES: THEIR MAGNITUDE, DURATION, AND FREQUENCY. THE RESISTANCE AGAINST FAILURES IS PROVIDED BY AN ASSEMBLAGE OR SYSTEM OF STRUCTURAL COMPONENTS. THE SYSTEM INCLUDES ANYTHING THAT IS INTERCONNECTED WITH THE STRUCTURE UNDER CONSIDERATION. THE TOTAL SYSTEM INCLUDES NOT ONLY THE SOIL BENEATH THE STRUCTURE BUT THE SOIL ADJACENT TO THE STRUCTURE. THE IMMEDIATE SYSTEM CONSISTS OF THE SOIL UNDER THE STRUCTURE DIRECTLY INVOLVED IN THE PROJECT. THE COMPLEMENTARY SYSTEM INCLUDES THE SOIL AND THE STRUCTURES BEYOND THE IMMEDIATE LIMITS OF THE PROJECT. FAILURE IN EITHER OF THESE SYSTEMS MAY BE RELATED TO EXTERNAL CIRCUMSTANCES THAT MUST BE EVALUATED IN THE DESIGN BUT ARE NOT REFLECTED IN THE STRENGTH OF THE COMPONENTS OF THE IMMEDIATE SYSTEM. THE COMPLEMENTARY SYSTEM MUST BE CONSIDERED VITAL IN THE ULTIMATE SAFETY OF ANY STRUCTURE, EVEN THOUGH THE EFFECTS OF THE COMPLEMENTARY SYSTEM CANNOT BE EXPRESSED IN TERMS OF A SIMPLE SAFETY FACTOR OF THE STRUCTURE. THE SAFETY FACTOR IS ELUSIVE BECAUSE MANY OF THE FACTORS THAT CONTRIBUTE TO THE SAFETY OF THE FOUNDATION CANNOT PRESENTLY BE EVALUATED WITH ACCURACY. THE FOLLOWING APPROACHES ARE DESCRIBED: (1) STATISTICAL ANALYSIS, (2) THE COMPONENT APPROACH, AND (3) THE EMPIRICAL APPROACH. A STATISTICAL ANALYSIS BECOMES UNRELIABLE AT THE EXTREMELY LOW PROBABILITIES THAT MUST BE CONSIDERED IN DESIGN. THE COMPONENT APPROACH USES VARYING SAFETY FACTORS TO BE APPLIED TO THE LOADS ACTING ON THE STRUCTURE AS WELL AS TO THE VARIOUS SOIL PROPERTIES USED IN ANALYSIS. SAFETY FACTORS ARE ALSO APPLIED TO THE COMPONENTS OF SOIL STRENGTH INDIVIDUALLY. THIS APPROACH IS JUDGED SOUND BUT ADDITIONAL COMPONENTS OF SAFETY FACTOR ARE NECESSARY BECAUSE OF THE UNCERTAINTIES IN THE ACCURACY OF THE ENGINEERING ANALYSIS USED. THE EMPIRICAL APPROACH IS THAT OF AN OVERALL SAFETY FACTOR DEVELOPED FROM EXPERIENCE. A PROPER USE OF THE EMPIRICAL APPROACH REQUIRES THAT THERE BE A FULL STUDY OF ALL FAILURES THAT OCCUR SO THAT THE SOURCE OF ERROR CAN BE PINPOINTED AND THE UNCERTAINTIES INVOLVED IN LOADING, EVALUATION OF RESISTANCES AND ENGINEERING ANALYSIS CAN BE ESTABLISHED." @default.
- W792355213 created "2016-06-24" @default.
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- W792355213 date "1969-01-01" @default.
- W792355213 modified "2023-09-23" @default.
- W792355213 title "THE SAFETY FACTOR IN EXCAVATIONS AND FOUNDATIONS" @default.
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