文档介绍：0:35:15第一章 1基础工程?基础工程?研究下部结构物与岩土相互作用共同承担上部结构物所产生各种强度、变形与稳定问题。?桩、墩基、箱基、支挡结构、围护结构、水泥搅拌体, 砂石桩体,锚固,土钉、砂井等等,都可视为结构物与岩土相互作用问题。 Factors of Safety ? Depends on ? Required reliability ? Consequences of a failure ? Uncertainties in soil properties and applied loads ? Construction tolerances ? Ignorance of the true behavior of foundations ? Cost-benefit ratio of additional conservatism in the design. 0:35:15第二章 4 0:35:15 [ ] a [ ] a Allowable stress design(use in this book) ? The design load is the most critical combination of the various load sources , as defined by codes .? ANSI/ASCE , D () D+L+F+H+T+(L ror S or R) () D+L+(L r or S or R) +( W or E) ( ) D+( W or E ) ( ) 5 0:35:16(1)由可变荷载控制时: ????? ni Qik ci Qi kQQ Gk GS SSS 2 11????组合值系数? c 6 0:35:16(2)由永久荷载控制时: ???? ni Qik ci Qi Gk GS SS 1???组合值系数? c7 0:35:16 (四)计算挡土墙、地基或斜坡稳定基滑坡推力时,荷载效应,按承载能力极限状态下荷载效应的基本组合,但其分项系数均为 1: ????? ni Qik ci Qi kQQ Gk GS SSS 2 11???????? ni Qik ci Qi Gk GS SS 1???1?? Qi G??组合值系数? c8 0:35:16 Serviceability requirements ? Intended to produce foundations that perform well when subjected to the service loads. ? The Requirements include: ? Settlement ? Heave 抬升? Tilt ? Lateral movement ? Vibration ? Durability 9 0:35:16 Measures for a large settlement ? Adjust the foundation design ? Use a more elaborate foundation ? Improve the properties of the soil ? Redesign the structure so it is more tolerant of settlements 10