Changes in the structural scri are correlated with the parameters of the supplemental dampers so that the dampers can be directly designed according to a. Paulay 1, the key idea of which is that the ideal locations of plastic hinges are chosen and suitably detailed to ensure the ductility capacity of seismicresistant structure, and other. Advocating for performancebased design report to the structural engineering institute board of governors. Uniform nationwide acceptance is expected to come slowly. This report describes the development of a performancebased framework to. Instructional materials complementing fema p751, design examples additive load w largest eccentricity. Next generation damage evaluation and seismic design based on collapse mechanism and residual capacity of buildings damaged due to repeated strong ground motions 1 maeda masaki, tohoku university kenneth elwood, university of auckland 20170304 jrapid ws kumamoto. During inelastic response, however, the members should be protected against premature brittle shear failure.
Analysis and capacity based earthquake resistance design of. Capacitydemand index relationships for performance based. Instructional material complementing fema 451, design examples seismic load analysis 9 3 load analysis procedure asce 7, nehrp recommended provisions 1. Guide specifications for lrfd seismic bridge design, 2 nd edition, with 2012, 2014, and 2015 interim revisions. The proposed reliability based methodology for establishing capacity design factors for components in seismic resistant structural steel buildings utilizes the wellestablished lrfd component reliability methodology with apt adjustments to address the issues specific to capacity based design. Naveed anwar executive director, ait consulting affiliated faculty, structural engineering director, acecoms performance based design capacity based design 2. This document includes guidance for developing detailed modeling, simulation of building response to extreme loading, and estimates of potential casualties, loss of occupancy, and economic losses. Seismic design of steel bucklingrestrained braced frames. This paper presents a performancebased methodology for the assessment of seismic vulnerability and capacity of buildings. Seismic design of structures is commonly based on strength or force. Towards displacementbased seismic design of modern. A performancebased design approach can be employed under these provisions. An energy based method for seismic design of frame.
Seismic design of steel buckling restrained braced frames. An alternate to the seismic provisions in the aashto lrfd bridge design specifications 2011. The seismic design of pile foundations is currently performed in a relatively simple, deterministic manner. Direct displacementbased design of precastprestressed.
Calculating the wind holddown capacity in wfcm table 3. Design and overstrength ofa bridge pier based on momentcurvatureanalysis 167 4. In the capacity design of structures for earthquake resistance. Memo to designers mtd 201 outlines the bridge category and classification, seismic performance criteria, seismic design philosophy and approach, seismic demands and capacities on structural and geotechnical components and seismic design practices that collectively make up caltrans seismic design methodology. A reexamination of capacitydesign equations for different structural systems, and development of new, ductilitybased equations and methodologies. A significant number of seismic rehabilitation design of an. Bridge approach embankments and fills through which cutandcover tunnels are constructed should be designed to remain stable during the design seismic event because. Deformation capacity and performancebased seismic design.
The difference between the segmented and perforated shear wall design approach and an overview of various. Direct design method based on seismic capacity redundancy. Demand and capacity factor design dcfd is a probabilitybased load and resistance factor lrfdlike format used for performancebased seismic design and assessment of structures. The focus throughout this lengthy research project has been on the development of practical and simple seismic design methodology, suitable for. With growing interest in extending the structural use of timber, significant effort has been devoted to study seismic behavior and develop design procedures, e. Seismic drift demand and capacity of nonseismically. The proposed reliabilitybased methodology for establishing capacity design factors for components in seismic resistant structural steel buildings utilizes the wellestablished lrfd component reliability methodology with apt adjustments to address the issues specific to capacitybased design.
This is ensured by providing sufficient shear capacity to resist seismic design shear forces. Performancebased design factors for pile foundations. Guidelines for performancebased seismic design of tall buildings november 2010 page vii glossary action a force, moment, strain, displacement, or other deformation resulting from the application of design load combinations. Performance based seismic design performance based seismic design is a process of designing new buildings or seismic upgradation of existing buildings, which includes a specific intent to achieve defined performance objectives in future earthquakes. Three techniques the capacity spectrum approach, the n2 method and direct displacementbased design have now matured to the stage. Guide specifications for lrfd seismic bridge design, 1 st edition. For the seismic capacity of direct displacementbased seismic design, it is a displacement response spectrum generated from several elastic.
Performancebased seismic design for tall buildings performancebased seismic design pbsd is a structural design methodology that has become more common in urban centers around the world, particularly for the design of highrise buildings. This procedure for design is known as capacity based design which would be the future design philosophy for earthquake resistant design of multi storey. With the exception of the swiss guidelines for the seismic assessment of masonry structures sia 2011, all drift capacity models are rather similar. Analysis and capacity based earthquake resistant design of multi storeyed building. Kurama2 abstract seismic design procedures in current building provisions are based on linear and nonlinear static approaches that use capacitydemand index relationships such as the relationship between the lateral strength and the maximum lateral. Current seismic design in the united states, and in most of the world, is carried out in accordance with forcebased design principles.
The vulnerability assessment methodology is based on the hazus methodology and the improved capacitydemanddiagram method. This report describes the development of a performance based framework to create seismic designs of pile group. Current design approaches in building codes around the world, e. Chapter 6 seismic design page 62 geotechnical design manual m 4603. Seismic conceptual design of buildings basic principles. Pdf analysis and capacity based earthquake resistant. It also relies on the stable energy dissipation capacity of the structure to control. General concepts of capacity based design semantic scholar. Design forces are based on the assumption that a significant. Performance based seismic design of reinforced concrete.
The concept of designing structures to achieve a specified performance limit state defined by strain or drift limits was first introduced, in new zealand, in 1993. Capacity design the objective of capacity design is to confirm a building undergoes controlled ductile behaviour in order to avoid collapse in a design level earthquake. Each performance objective is a statement of the acceptable risk of incurring specific levels of damage, and the consequential losses that occur as a result of this. Capacitydemand index relationships for performancebased seismic design structural engineering research report department of civil engineering and geological sciences university of notre dame notre dame, indiana november 2001 kenneth t. Changes in one element of a design tend to be counterbalanced by changes in another element. While the alternative methods and materials clause of the prescriptive codes allows the use of performancebased design procedures, the 2010 edition of the american society of civil engineers asce standard 7, minimum design loads for buildings and other structures. Special design provisions for wind and seismic design category asd allowable stress sections 3. Deformation capacity and performance based seismic design for reinforced concrete coupling beams ying zhou1, lei lu2, zhihua huang3 and dan li4 1 professor, state key laboratory of disaster reduction in civil engineering, tongji university, p. Design principle based on phliosophy ofcapacity design the design philosophy based on capacity design was proposed by professor r.
A comprehensive overview on drift capacities in codes is given in petry and beyer. As noted in table 2, structures are assigned to a seismic design category based. Cee spring distinguished lecture performancebased seismic design of tall buildings jack moehle duration. A guide for practicing engineers, gcr 1591734, nehrp seismic design technical brief no.
Foundation analysis and desing foundation design 1. This involves designing the structure to allow ductile failure at key predictable locations within the structure and to prevent other failure types occurring near these. A program for artificial motion generation, users manual and. Thus, use 75% of seismic vertical reactions foundation design 17.
An information series from the national authority on concrete masonry technology ncma tek 1418b 1 seismic design and detailing requirements for masonry structures introduction historically, degree of seismic risk and the resulting design loads have been linked to seismic zones, with higher seismic zones associated with higher anticipated ground motion. Instructional material complementing fema 451, design 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. This topic introduces the concepts of seismicresistant design from a philosophical. Jindirect design method based on seismic capacity redundancy for structures with metal yielding dampers earthq eng struct dyn, 47 2 2018, pp. Displacementbased seismic design of structures article pdf available in earthquake spectra 242 may 2008 with 10,482 reads how we measure reads. Next generation damage evaluation and seismic design based. Over the following years, and in particular the past five years, an intense coordinated research effort has been underway in europe and the usa to develop the concept to the stage where it is a viable and logical alternative to. Seismic design of buildings worked examples worked examples presented at the workshop ec 8. In forcebased design, elastic forces are based on initial elastic estimates of building period together with a design accelera tion spectrum for 5 percent damping. Pdf displacementbased seismic design of structures. Capacitydemand index relationships for performancebased.
Introduction one of the emerging fields in seismic design of structures is the performance based design. Psycharis displacementbased seismic design 2 forcebased seismic design codes although the structure is designed to yield during the design earthquake, only the elastic part of the response, up to yield, is examined. Seismic design response spectra for rock sites developed from chinese code gb500112001 are compared with the uniform hazard response spectra developed at the university of hong kong. Performancebased methodology for assessing seismic. In this study, a direct static design method for structures with metal yielding dampers is proposed based on a new design target called the seismic capacity redundancy indicator scri.
Fema 451b topic 12 notes masonry structures 12 4 instructional material complementing fema 451, design examples design of masonry structures 12 4 context in the nehrp recommended provisions design seismic loads load combinations chap. The scria quantitative measure of the seismic capacity redundancyis defined as the ratio of the seismic demand required by the target performance limit to the design seismic demand. Based on the survey, it was observed that the transition to displacement based seismic design is a rather slow process due to inertia invariably encountered in the engineering community. The spectral displacement s d of performance points on a capacity curve is used to estimate the damage level of a building.
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