Published June 1995 by American Society of Civil Engineers .
Written in EnglishRead online
|The Physical Object|
|Number of Pages||79|
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Performance of Deep Foundation Under Seismic Loading: Proceedings of Sessions Sponsored by the Deep Foundations and Soil Properties Committees of the soci (Geotechnical Special Publication) [Turner, John P.] on *FREE* shipping on qualifying offers. Performance of Deep Foundation Under Seismic Loading: Proceedings of Sessions Sponsored by the Deep Foundations.
Example illustrates the analysis and design of deep foundations for a building similar to the one performance. Maintaining a reasonably consistent level of service load-bearing pressures for all of the Chapter 21 provides the minimum requirements for concrete foundations in Seismic Design Categories D, E and F.
In this paper, a review has been done on the seismic performance of pile foundations in liquefiable soil. The paper provides a useful and current overview of this aspect of design of pile.
properties, quantifying strain-dependent soil behavior under cyclic loading, and conducting sufficient in-situ and laboratory testing to accurately capture the variability of the subsurface conditions under the mat foundation. Demand levels. Seismic demand levels defined by the current applicable building codes and standards in the United StatesFile Size: 2MB.
Book Description. Seismic Performance of Soil-Foundation-Structure Systems presents invited papers presented at the international workshop (University of Auckland, New Zealand, November ). This international workshop brought together outstanding work in earthquake engineering that embraces a holistic consideration of soilfoundation-structure systems.
They were submitted under the following topics: LRFD, Foundations in Power/Telecommunication and Seismic Engineering Design, Deep Foundation Design, Construction, Performance and Behavior in Special Soil/Rock Conditions, Design and Construction State-of-the-Art Practices for Deep Foundations and Retaining Structures.
The performance of pile foundations under seismic loading has been researched since the early s, and the results of these researches have formed a considerable level of understanding. Under seismic excitation, a pile undergoes stresses both as a result of the vibration of the surrounding soil (kinematic interaction) and that of the.
Shallow and Deep Foundations • Elastic and Plastic Analysis. Instructional Materials Complementing FEMA P, Design Examples Foundation Design - 3. Load Path and Transfer of Seismic Forces. soil pressure. Force on a pile EQ on unloaded pile Pile supporting structure.
Inertial force. Unmoving soil EQ Motion. deflected shape. SYNOPSIS Research on soil-pile-structure interaction under dynamic loading over the past 20 years has led to a variety of analysis approaches of varying complexity to address a range of dynamic problems. Many of these analysis approaches have been adapted for use for the seismic design of pile foundations.
Performance of Deep Foundation Under Seismic Loading book structure interaction (foundation response to seismic loading), earthquake-induced earth pressures on retaining walls, and an assessment of the impacts of geologic hazards on the structures.
Geotechnical Seismic Design Policies Seismic Performance Objectives In general, the AASHTO Load and Resistance Factor Design (LRFD) Bridge Design. Instructional Material Complementing FEMADesign Examples Seismic Load Analysis 9 - 17 1a, 1b) Stiffness (Soft Story) Irregularity Vertical Structural Irregularities Irregularity (1a) exists if stiffness of any story is less than 70% of the stiffness of the story above or less than 80% of the average stiffness of the three stories above.
The seismic performance of four pile-supported models is studied for two conditions: (i) transient to full liquefaction condition, i.e. the phase when excess pore pressure gradually increases.
The seismic design of pile foundations is currently performed in a relatively simple, deterministic manner. This report describes the development of a performance-based framework to create seismic designs of pile group foundations that consider all potential levels of loading and their likelihoods of occurrence in a particular area.
The load-displacement response of liquefied soils surrounding deep foundations has been investigated previously by conducting lateral load tests on a full-scale 3 x 3 steel pipe pile group embedded in sands liquefied by controlled blasting.
This paper presents a simple procedure to develop stiffness matrix for bridge foundations under seismic loading conditions. The methodology is based on the results of a pilot program for the Washington State Department of Transportation in which a design manual was developed to assist the bridge engineers for seismic design of bridge foundations for.
the long-term performance of a deep foundation. This standard provides minimum requirements for test-ing deep foundations under static axial compressive load. Plans, speciﬁcations, and/or provisions prepared by a qualiﬁed engineer may provide additional requirements and procedures. Page 5 az,max =C⋅amax,s (2) where a z,max is the peak acceleration at the depth of the tunnel.
Table 2. Ratios of ground motion (C) at depth to motion at ground surface [Power et al. The value of az,max is used to determine the γmax (maximum shear deformation in free-field condition) from the peak ground velocity V s (Table 2) that is a function of earthquake.
For construction of a 16 mgd sewage treatment plant on predominantly deep, soft, cohesive soils in an area of highest seismic susceptibility, soil improvement with stone columns was considered as one foundation solution. Geometry of foundation elements Check of eccentric bracings under gravity load combination.
VERTICAL SEISMIC LINKS Check of columns under seismic actions. Check of beams under seismic actions. Shallow and deep foundations Elastic and plastic analysis. Instructional Materials Complementing FEMADesign Examples Foundation Design Load Path and Transfer to Soil Soil Pressure Force on a pile EQ on unloaded pile Pile supporting structure • Definition of seismic load effect E.
The main objectives of this paper are to explore the available helical piles systems as well the performance of the helical pile foundation systems under monotonic and cyclic axial and lateral loads.
In addition, to explore the new helical screw pile systems suitable for seismic retrofitting of existing foundations and for new structures.
Azizkandi, A. S., Baziar, M. and Yeznabad, A. 3D Dynamic Finite Element Analyses and 1 g Shaking Table Tests on Seismic Performance of Connected and Nonconnected Piled Raft Foundations.
KSCE Journal of Civil Engineering, 22, CrossRef Google Scholar. shallow foundation requirements 33 deep foundation requirements 34 5 shallow foundatIon desIGn 35 ntroduction i 35 types of shallow foundations 36 Pad footings and strip footings 37 gravity design procedure 39 seismic design procedure 41 foundation beams 42 design of mats and rafts foundation design loads 3 design stillwater flood depth over the life of a building is the single most important flood load calculation that will be made; nearly all other coastal flood load parameters or calculations (e.g., hydrostatic load, design flood velocity, hydrodynamic load, design wave height, DFE, debris im.
This main difference, which affects the overall behaviour and design of the foundation under both static (essentially vertical) and seismic loads, stems from the different length-to-width ratio (i.e. slenderness), which is typically in the range of –4 for caisson foundations and larger than 8 for piles [1,2].
In DFI - 42nd Annual Conference on Deep Foundations, New Orleans, LA, USA: Deep Foundations Institute. Accepted.
Heidari, M., M.K. Elsawy, and M.H. El Naggar. “Nonlinear Seismic Response Analysis of Single Pile in Sand.” In PBD- III - 3rd International Conference on Performance Based Design in Earthquake Geotechnical. SEISMIC BEHAVIOUR OF BEAM COLUMN JOINTS IN REINFORCED CONCRETE MOMENT RESISTING FRAMES - A REVIEW S.R.
Uma 1 and A. Meher Prasad 2 1 Project officer, Department of Civil Engineering, IIT Madras, India – 2 Professor, Department of Civil Engineering, IIT Madras, India- Abstract The beam column joint is the crucial zone in.
50 Performance of Exterior Beam-Column Joints under Seismic Type Loading 1. Design of Exterior Joint The joint shear strength and strong-column weak-beam condition for the earthquake ground motion in the X- and Y-directions were checked as per the draft revision of IS (BIS, ) and were found to be satisfactory.
(a) (b). If a building's foundation sits on soft or filled-in soil, the whole building may fail in an earthquake regardless of the advanced engineering techniques employed. Assuming, however, that the soil beneath a structure is firm and solid, engineers can greatly improve how the building-foundation system will respond to seismic waves.
WIND LOAD: Wind load acts on all exposed surface structures. The magnitude of the design wind pressure is given in local codes. The wind loads may be neglected in designing the foundation unless caused loads on foundations exceeding one – third of the load due to dead and live loads combined.
The International Code Council (ICC) is a non-profit organization dedicated to developing model codes and standards used in the design, build and compliance process. The International Codes (I-Codes) are the widely accepted, comprehensive set of model codes used in the US and abroad to help ensure the engineering of safe, sustainable, affordable and resilient structures.
If feasible, without exceeding the safe structural load on the pile(s) or pile cap, the maximum load applied should reach a failure load from which the Engineer may determine the ultimate axial static compressive load capacity of the pile(s).
Tests that achieve a failure load may help the designer improve the efficiency of the foundation by reducing the piling length, quantity. All the above for single and group foundations Structural resistance checks for axial, lateral and flexure Punching of foundation elements through stronger soil in to weaker soils All the above resistances under scour at design flood, Q Axial resistance when downdrag occurs (AASHTO, & ).
footing under a 12 in. bearing wall of a 10 story building founded on soil. Given: /Νc = 4 ksi /y = 60 ksi Dead Load = D = 25 k/ft Live Load = L = k/ft Wind O.T.
= W = 4 k/ft (axial load due to overturning under wind loading) Seismic O.T. = E = 5 k/ft (axial load due to overturning under earthquake loading) Allowable soil bearing pressures.
Seismic Design NYSDOT Geotechnical Page November 4, Design Manual Rev. 1 Shaking Level Description I. Not felt except by a very few under especially favorable circumstances.
Felt only by a few persons at rest, especially on upper floors of buildings. Suspended objects may swing slightly. III. an extensive database of seismic damage to under-ground structures using case histories.
Power et al. Ž provide a further update with case histories. The following general observations can be made re-garding the seismic performance of underground struc-tures: 1. Underground structures suffer appreciably less damage than surface. Seismic Design Specification for Buildings, Structures, Equipment, and Systems: 12/31/ 1 1 General Design Requirements SLAC will use the California Building Code (CBC) for structural design criteria.1 The CBC adjusts the level of design based on risk categories from I to IV.
EFFECT OF EARTHQUAKE SEISMIC LOAD ON STRUCTURAL FOUNDATIONS Key words: Seismic loads, Earthquake, Foundations 1. Abstract Most of earthquake related casualties are caused by structural collapse, and with proper design and construction practices it can be possible to mitigate the impacts of such natural disaster.
Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to better understanding of seismic demand on structures and with our recent experiences with large earthquakes near urban centers, the need of seismic retrofitting is well acknowledged.
Prior to the introduction of modern seismic. pile foundations. Pile foundations Pile foundations are the part of a structure used to carry and transfer the load of the structure to the bearing ground located at some depth below ground surface.
The main components of the foundation are the pile cap and the piles. Piles are long and slender members which transfer the load to deeper soil or. The book addresses the behavior of reinforced concrete materials, components, and systems subjected to routine and extreme loads, with an emphasis on response to earthquake loading.
Design methods, both at a basic level as required by current building codes and at an advanced level needed for special problems such as seismic performance Reviews: Certificates of compliance for the fabrication of structural, load-bearing or lateral load-resisting members or assemblies on the premises of an approved fabricator in accordance with Section Certificates of compliance for the seismic qualification of nonstructural components, supports and attachments in accordance with Section capacity of shallow and deep foundations for certain soil and foundation conditions using well-established, approximate solutions of bearing capacity.
(1) This manual excludes analysis of the bearing capacity of foundations in rock. (2) This manual excludes analysis of bearing capacity influenced by seismic forces.