# Tiếng Anh chuyên ngành Sổ tay kết cấu

Civil engineers throughout the world accept both the United States Customary System(USCS) and the System International (SI) units of measure for both applied and theoretical calculations. However, the SI units are much more widely used than those of the USCS. Hence, both the USCS and the SI units are presented for essentially every formula in this book. Thus, the user of the book can apply the formulas with confidence anywhere in the world. To permit even wider use of this text, this chapter con-tains the conversion factors needed to switch from one sys-tem to the other. For engineers unfamiliar with either system of units, the author suggests the following steps for becoming acquainted with the unknown system: 1. Prepare a list of measurementscommonly used in your daily work. 2. Insert, opposite each known unit,the unit from the other system. Table 1.1 shows such a list of USCS units with corresponding SI units and symbols prepared by a civil engineer who normally uses the USCS. The SI units shown in Table 1.1 were obtained from Table 1.3 by the engineer. 3. Find, from a table of conversion factors,such as Table 1.3, the value used to convert from USCS to SI units. Insert each appropriate value in Table 1.2 from Table 1.3. 4. Apply the conversion valueswherever necessary for the formulas in this book. 5. Recognize—here and now—that the most difficult aspect of becoming familiar with a new system of meas-urement is becoming comfortable with the names and magnitudes of the units. Numerical conversion is simple, once you have set up your own conversion table.

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