Seismic design of steel bucklingrestrained braced frames. This report describes the development of a performancebased framework to. An alternate to the seismic provisions in the aashto lrfd bridge design specifications 2011. Instructional materials complementing fema p751, design examples additive load w largest eccentricity. Capacitydemand index relationships for performancebased. Performancebased methodology for assessing seismic. The seismic design of pile foundations is currently performed in a relatively simple, deterministic manner. Current design approaches in building codes around the world, e. The dcfd format is based on a technical framework that provides a closedform analytical. Towards displacementbased seismic design of modern.
Deformation capacity and performancebased seismic design. 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. 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. 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. Foundation analysis and desing foundation design 1. The analysis is based on the corresponding secant stiffness. A program for artificial motion generation, users manual and. 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. Special design provisions for wind and seismic design category asd allowable stress sections 3. In the capacity design of structures for earthquake resistance. 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. Performance based seismic design of reinforced concrete. 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. 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.
During inelastic response, however, the members should be protected against premature brittle shear failure. Demand and capacity factor design dcfd is a probabilitybased load and resistance factor lrfdlike format used for performancebased seismic design and assessment of structures. Direct design method based on seismic capacity redundancy. A significant number of seismic rehabilitation design of an. 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. Reinforced concrete shear walls are one of the most. 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. 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. Pdf analysis and capacity based earthquake resistant. This topic introduces the concepts of seismicresistant design from a philosophical.
Seismic design of buildings worked examples worked examples presented at the workshop ec 8. With the exception of the swiss guidelines for the seismic assessment of masonry structures sia 2011, all drift capacity models are rather similar. This procedure for design is known as capacity based design which would be the future design philosophy for earthquake resistant design of multi storey. Next generation damage evaluation and seismic design based. This is ensured by providing sufficient shear capacity to resist seismic design shear forces. It also relies on the stable energy dissipation capacity of the structure to control.
Jindirect design method based on seismic capacity redundancy for structures with metal yielding dampers earthq eng struct dyn, 47 2 2018, pp. 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. This report describes the development of a performance based framework to create seismic designs of pile group. Medium dense sand spt n 20 density 120 pcf friction angle 33 o gravity load allowables 4000 psf, b 40 ft bearing capacity eq 2000. Instructional material complementing fema 451, design examples seismic load analysis 9 3 load analysis procedure asce 7, nehrp recommended provisions 1. 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. 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. Cee spring distinguished lecture performancebased seismic design of tall buildings jack moehle duration. Analysis and capacity based earthquake resistance design of. A comprehensive overview on drift capacities in codes is given in petry and beyer. 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. Chapter 6 seismic design page 62 geotechnical design manual m 4603. General concepts of capacity based design semantic scholar.
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. Design and overstrength ofa bridge pier based on momentcurvatureanalysis 167 4. As noted in table 2, structures are assigned to a seismic design category based. Displacementbased seismic design of structures article pdf available in earthquake spectra 242 may 2008 with 10,482 reads how we measure reads. The vulnerability assessment methodology is based on the hazus methodology and the improved capacitydemanddiagram method. Current seismic design in the united states, and in most of the world, is carried out in accordance with forcebased design principles. Seismic design of structures is commonly based on strength or force. Performancebased design factors for pile foundations. 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. Introduction one of the emerging fields in seismic design of structures is the performance based design. A performancebased design approach can be employed under these provisions.
For the seismic capacity of direct displacementbased seismic design, it is a displacement response spectrum generated from several elastic. Pdf displacementbased seismic design of structures. 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. Guide specifications for lrfd seismic bridge design, 2 nd edition, with 2012, 2014, and 2015 interim revisions.
The spectral displacement s d of performance points on a capacity curve is used to estimate the damage level of a building. 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. Deformation capacity and performancebased seismic design for. Uniform nationwide acceptance is expected to come slowly. A guide for practicing engineers, gcr 1591734, nehrp seismic design technical brief no. Guide specifications for lrfd seismic bridge design, 1 st edition.
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. Advocating for performancebased design report to the structural engineering institute board of governors. 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 conceptual design of buildings basic principles. Instructional materials complementing fema p751, design examples shallow footing examples soil parameters. Naveed anwar executive director, ait consulting affiliated faculty, structural engineering director, acecoms performance based design capacity based design 2. Seismic design of steel buckling restrained braced frames. 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. Capacitydemand index relationships for performance based. Calculating the wind holddown capacity in wfcm table 3. An energy based method for seismic design of frame.
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. The difference between the segmented and perforated shear wall design approach and an overview of various. 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. 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. The focus throughout this lengthy research project has been on the development of practical and simple seismic design methodology, suitable for. Seismic drift demand and capacity of nonseismically. 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. 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. 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. Direct displacementbased design of precastprestressed. Design forces are based on the assumption that a significant.
Bridge approach embankments and fills through which cutandcover tunnels are constructed should be designed to remain stable during the design seismic event because. This paper presents a performancebased methodology for the assessment of seismic vulnerability and capacity of buildings. 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. With growing interest in extending the structural use of timber, significant effort has been devoted to study seismic behavior and develop design procedures, e. Design principle based on phliosophy ofcapacity design the design philosophy based on capacity design was proposed by professor r. Changes in one element of a design tend to be counterbalanced by changes in another element. Analysis and capacity based earthquake resistant design of multi storeyed building. Performance based seismic design performance based design begins with the selection of design criteria stated in the form of one or more performance objectives. A reexamination of capacitydesign equations for different structural systems, and development of new, ductilitybased equations and methodologies.
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