Table A.1 Relationship between USCS and SI Units for Selected Quantities USCS Units SI Units Quantity Conversion Name Symbol Name Symbol foot t 1ft=0.3048m Lengh meter m inch in. 1in.=0.0254m pound Ib 11b=0.4536kg Mass kilogram kg kilopound kip 1kip=453.6kg pound b 1Ib=4.448N Newton, Force N kilopound kip kg.m/sec2 1kip=4.448kN pound/foot2 psf 1psf=47.88Pa Pascal, Pressure N/m2 Pa pound/inch2 psi 1psi=6895Pa 同海大学 土水2程学院 13 ONGII UNIVERSITY Concluding remark Assumptions principles =>Simplification(简化) 同膀大学 土本2程学院 14 TONGJI UNIVERSITY