ISO 23469-2005 Bases for design of structures - Seismic actions for designing geotechnical works《建筑设计基础 对设计土工技术作业的地震作用》.pdf

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1、 Reference number ISO 23469:2005(E) ISO 2005INTERNATIONAL STANDARD ISO 23469 First edition 2005-11-15 Bases for design of structures Seismic actions for designing geotechnical works Bases du calcul des constructions Actions sismiques pour le calcul des ouvrages gotechniques ISO 23469:2005(E) PDF dis

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5、rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of

6、 the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reservedISO 23469:2005(E) ISO 2005 All rights reserved iiiContents Page Foreword iv Introduction

7、 v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Symbols and abbreviated terms . 7 5 Principles and procedure. 7 5.1 Principles. 7 5.2 Procedure for determining seismic actions.9 6 Evaluation of earthquake ground motions, ground failure, and fault displacements. 9 6.1 General.

8、9 6.2 Seismic hazard analysis 10 6.3 Site response analysis and assessment of liquefaction potential 11 6.4 Spatial variation 12 6.5 Fault displacements, ground failure, and other geotechnical hazards. 14 6.6 Paraseismic influences 14 7 Procedure for specifying seismic actions . 14 7.1 Types and mod

9、els of analysis. 14 7.2 Seismic actions for equivalent static analysis 16 7.3 Seismic actions for dynamic analysis 17 8 Seismic actions for equivalent static analysis 17 8.1 Seismic actions for simplified equivalent static analysis 17 8.2 Seismic actions for detailed equivalent static analysis 20 9

10、Seismic actions for dynamic analysis 21 9.1 Seismic actions for simplified dynamic analysis 21 9.2 Seismic actions for detailed dynamic analysis . 23 Annex A (informative) Primary issues for specifying seismic actions. 24 Annex B (informative) Upper crustal rock, firm ground, and local soil deposit

11、27 Annex C (informative) Design situations for combination of actions 29 Annex D (informative) Seismic hazard analysis and earthquake ground motions 30 Annex E (informative) Site response analysis . 36 Annex F (informative) Spatial variation of earthquake ground motion . 46 Annex G (informative) Ass

12、essment of liquefaction . 51 Annex H (informative) Seismic actions defined for various models of geotechnical works. 57 Annex I (informative) Soil-structure interaction for designing deep foundations: phase for inertial and kinematic interactions 73 Annex J (informative) Limitations in the conventio

13、nal method and emerging trend for evaluating active earth pressure 74 Annex K (informative) Effects of liquefaction considered in various models of geotechnical works 76 Annex L (informative) Evaluation of other induced effects . 80 Annex M (informative) Concepts of response control and protection .

14、 83 Annex N (informative) Interdependence of geotechnical and structure designs 84 Bibliography . 85 ISO 23469:2005(E) iv ISO 2005 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work

15、 of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmen

16、tal, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The ma

17、in task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. At

18、tention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 23469 was prepared by Technical Committee ISO/TC 98, Bases for design of structures, Subcommittee S

19、C 3, Loads, forces and other actions in collaboration with ISSMGE/TC4 and CEN/TC205/SC8. ISO 23469:2005(E) ISO 2005 All rights reserved vIntroduction This International Standard provides guidelines to be observed by experienced practising engineers and code writers when specifying seismic actions in

20、 the design of geotechnical works. Geotechnical works are those comprised of soil or rock, including buried structures (e.g. buried tunnels, box culverts, pipelines and underground storage facilities), foundations (e.g. shallow and deep foundations, and underground diaphragm walls), retaining walls

21、(e.g. soil retaining and quay walls), pile-supported wharves and piers, earth structures (e.g. earth and rockfill dams and embankments), gravity dams, landfill and waste sites. The seismic actions described are compatible with ISO 2394. The seismic performance of geotechnical works is significantly

22、affected by ground displacement. In particular, soil-structure interaction and effects of liquefaction play major roles and pose difficult problems for engineers. This International Standard addresses these issues in a systematic manner within a consistent framework. The seismic performance criteria

23、 for geotechnical works cover a wide range. If the consequences of failure are minor and the geotechnical works are easily repairable, their failure or collapse may be acceptable and explicit seismic design may not be required. However, geotechnical works that are an essential part of a facility han

24、dling hazardous materials or a post-earthquake emergency facility shall maintain full operational capacity during and after an earthquake. This International Standard presents a full range of methods for the analysis of geotechnical works, ranging from simple to sophisticated, from which experienced

25、 practising engineers can choose the most appropriate one for evaluating the performance of a geotechnical work. INTERNATIONAL STANDARD ISO 23469:2005(E) ISO 2005 All rights reserved 1Bases for design of structures Seismic actions for designing geotechnical works 1 Scope This International Standard

26、provides guidelines for specifying seismic actions for designing geotechnical works, including buried structures (e.g. buried tunnels, box culverts, pipelines and underground storage facilities), foundations (e.g. shallow and deep foundations, and underground diaphragm walls), retaining walls (e.g.

27、soil retaining and quay walls), pile-supported wharves and piers, earth structures (e.g. earth and rockfill dams and embankments), gravity dams, landfill and waste sites. NOTE The guidelines provided in this International Standard are general enough to be applicable for both new and existing geotech

28、nical works. However, for use in practice, procedures more specific to existing geotechnical works can be needed, such as those described for existing structures in ISO 13822. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated

29、references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 2394:1998, General principles on reliability for structures ISO 3010:2001, Bases for design of structures Seismic actions on structures ISO 13822:

30、2001, Bases for design of structures Assessment of existing structures 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 2394, ISO 3010 and ISO 13822 and the following apply. 3.1 array observation simultaneous recording of earthquake ground motions and

31、/or microtremors by an array of seismometers 3.2 basin effects effects on earthquake ground motions caused by the presence of a basin-like geometrical boundary beneath the site NOTE Deep basin effects are defined as effects due to the geometry of the interface between the upper crustal rock and the

32、overlying firm ground or soil deposits. Shallow basin effects are defined as effects due to the geometry of the interface between the firm ground (or shallow upper crustal rock) and the local soil deposits and may be treated as part of the local site response. ISO 23469:2005(E) 2 ISO 2005 All rights

33、 reserved3.3 coherency function function describing a degree of correlation between two time histories 3.4 crest top of a geotechnical structure, typically defined for embankments and dams 3.5 culvert tunnel-like structure constructed typically in embankments or ground forming a passage or allowing

34、drainage under a road or railroad 3.6 damping mechanism that dissipates energy of motion 3.7 deep foundation foundation having a large depth to width ratio, which transfers applied loads to deep soil deposits EXAMPLES Pile foundation, sheet pile foundation, cofferdam foundation, caisson foundation.

35、3.8 design working life duration of the period for which a structure or a structural element is designed to perform as intended with expected maintenance, but without major repair being necessary 3.9 deterministic seismic hazard analysis seismic hazard analysis based on the selection of individual e

36、arthquake scenarios 3.10 dynamic analysis analysis for computing the dynamic response of a system based on the equations of motion 3.11 earth pressure pressure from soil on a wall or an embedded portion of a structure 3.12 earth structure geotechnical work consisting primarily of soil or rock EXAMPL

37、ES Earth and rockfill dams, and embankments. 3.13 earthquake ground motions transient motions of the ground caused by earthquakes, including those at the ground surface, within the local soil deposit, and at the interface between the firm ground and the local soil deposit 3.14 effective stress analy

38、sis analysis with consideration of pore pressure changes 3.15 equivalent linear model linear model incorporating elastic shear moduli and damping factors that are compatible, at various strain amplitudes, with the non-linear stress-strain relationship under cyclic loading ISO 23469:2005(E) ISO 2005

39、All rights reserved 33.16 equivalent static analysis static analysis that approximates the dynamic response of the system 3.17 excess pore water pressure change of water pressure in the soil pores with respect to those at a reference state 3.18 failure mode pattern of failure defined by distinctive

40、features of the deformed shape after failure 3.19 fault displacement permanent tectonic ground displacement associated with fault dislocation 3.20 firm ground soft rock or stiff soil layer 3.21 free field ground not subject to the effect of geotechnical works or structures 3.22 geotechnical characte

41、rization specification of material and geometrical parameters of soil or rock 3.23 geotechnical hazard hazard associated with geotechnical phenomena, including ground failure and subsidence 3.24 geotechnical work work that includes soil or rock as primary components with or without structural parts

42、made of concrete, steel, or other materials EXAMPLES Buried structures (e.g. buried tunnels, box culverts, pipelines and underground storage facilities), foundations (e.g. shallow and deep foundations, and underground diaphragm walls), retaining walls (e.g. soil retaining and quay walls), pile-suppo

43、rted wharves and piers, earth structures (e.g. earth and rockfill dams and embankments) gravity dams, landfill and waste sites. 3.25 ground failure mass movement of soil including liquefaction-induced ground deformations (settlement, lateral spreading, flow failure) and non-liquefaction-induced grou

44、nd deformations (seismic compaction, permanent deformations and landslides) 3.26 horizontal wave propagation effect effect causing spatial variation of ground motion in the horizontal direction due to the finite speed of wave propagation 3.27 hydro-dynamic pressure transient pressure exerted by a fl

45、uid on a structure in a system subject to dynamic motion 3.28 importance of a structure or facility degree of possible consequences of failure of a structure or facility caused by a reference earthquake motion ISO 23469:2005(E) 4 ISO 2005 All rights reserved3.29 inertial interaction part of soil-str

46、ucture interaction arising from the inertia forces acting on the structure 3.30 kinematic interaction part of soil-structure interaction arising from the deformation of the soil relative to that of the structure 3.31 liquefaction large drop in soil shear strength and/or stiffness caused by an increa

47、se in pore water pressure that may cause significant reduction in the shear resistance of geotechnical works and ground or may induce large ground displacement 3.32 liquefaction potential susceptibility of the soil to the onset of liquefaction under a reference earthquake motion 3.33 local site effe

48、ct effect of the local geological configuration on earthquake ground motions 3.34 lumped mass mass assigned at discrete points of a model representing a continuum 3.35 microtremors small amplitude vibration of the ground generated by either human activities or natural phenomena 3.36 overstrength str

49、ength of a structure or structural element, typically specified by the ratio of actual strength to nominal design strength 3.37 performance criteria set of conditions for specifying the response of a geotechnical work to meet the expected state defined by engineering parameters, such as acceptable displacements, strains or stresses, that characterize the performance objectives of design 3.38 performance objective expression of the expected performance of a facility in order to fulfil its purposes and functions 3.39 phase velocity velocity at