In this case, extra plywood sheet is arranged at the center of normal plywood wall and series of pairs of studs are positioned on the both sides of midply. Seismic design of wood lightframe structural diaphragm. These topics have in common that they are of interest to the designers of wood frame shear wall structures. Paper ii johan vessby, bertil enquist, hans petersson and tomas alsmarker, experimental study of crosslaminated timber wall panels, european journal of wood and wood products 2009 67. Cripple walls and wood framed basement walls first. Note doing this will automatically modify the rigidity for shear force distribution based on to shearwall capacity. Wood shear walls it is intended that these topics would be collaboratively considered by it4 and the awc wood design standards committee andor its seismic task committee. Three types of loads can be imposed on walls for such designs. Shear wall analysis and design spwall software spwall is a program for the analysis and design of reinforced concrete shear walls, tiltup walls, precast wall and insulate concrete form icf walls. Gypsum is assumed as interior shear wall sheathing, but the approach will show the difference when not including its.
The basic approach to the lateral design of wood structures is the same as for other structures. It uses a graphical interface that enables the user to easily generate complex wall models. Common wood framed lateral forceresisting systems will be discussed as will the components included in wood shear walls. In the wall and shearline input view, ensure that there are no unknowns on the exterior side of the wall.
Mechanics of multistory segmented shear walls and load combinations. Wood shear wall design examples for wind i n this article, a wood frame shear wall is analyzed and compared per american wood councils 2015 wood frame construction manual wfcm and 2015 special design provisions for wind and seismic sdpws. Design of ordinary shear walls the shear wall is designed as a cantilever beam fixed at the base, to transfer load to the foundation. Shear walls types of shear wall and its efficiency. Superior structural engineering software for analysis and design by risa tech, inc. Wood shear wall design examples for wind structure magazine. Mathematical model for latera l stiffness of shear walls with openings. Shear design analyzes a members ability to resist forces which cause it to shear, or break off, perpendicular to grain in the direction of the applied load. The latter can further influence ductility and seismic resistance of the shear wall. Optimizes shear wall design by iterating and automatically selecting the most economical sheathing and nailing patterns.
Calc base shear design plywood sheathing and base shear connection design tip design nailed connection first as this is likely to be the most difficult design component to achieve. Most residential and light commercial construction is based on a box design. Shear wall is a structural member in a reinforced concrete framed structure to resist lateral forces such as wind forces. Wood shear wall seismic and wind design example per 2015. In this paper, design aspects of midrise wood frame construction are discussed with special emphasis on capacity based shear wall and diaphragm design which was implemented in the canadian wood. Engineered wood products are a good choice for the environment. Shear wall height, h, and width, bs h, ft bs, ft hbs. This course presents information on design and construction of wood diaphragms and shear walls.
Components of shear wall design accumulated tension from framing to hardware to framing at each floor level. The term diaphragm is usually applied to roofs and floors. Wood and steel strongwall shearwalls have been evaluated to the 2006 ibcirc in icces code report esr1267 wood and esr1679 steel. The difference between the segmented and perforated shear wall design approach and an overview of. For wall 1, a continuous anchor rod system is used as holddown. Development of seismic loads using the simplified alternative structural design criteria herein. Shear wall deflection calculations generally based on nzs36003 cl 5. Singlefamily residential wood lightframe construction. These forces typically are vertical loads applied to the members strong axis. General reference risafloor online help release notes tutorials. Segmented shear wall ssw design method, chords are provided at each end of every shear wall segment i. In this example, the structure is designed and detailed for forces acting in the transverse and longitudinal directions, including the following. Architectural considerations associated with wood framing will be.
Can design only a portion to carry shear load, but need to detail rest of. Chapter 4 lateral vi list of tables table 1 calibrated connector parameters table 2 example clt wall design resistance kips 1516 table 3 test matrix for 7. Feb 24, 2015 des45 wood shear wall seismic and wind design example per 2015 wfcm and 2015 sdp duration. Two weeks ago, i had the chance to present to the young members group of the structural engineering association of metro. Wood shear wall analysis structural engineering general. The shear design and flexural design are provided in tables 2 and 3. This paper is based on a presentation that was given at a timber design society seminar and is aimed at enabling. These shear walls have intentionally been reduced in length from what may normally occur to demonstrate the effects of diaphragm and shear wall stiffness on drift and torsional irregularity issues, and to show their effects on the diaphragm chord forces. All elements either need to be isolated, or will participate in carrying the load 2. Example aspect ratio factors for wood structural panel. Most residential and light commercial construction is based on box design. There are several design tools and standards to assist engineers, architects, and build ing officials with the design of h ll p i ti h h thf shear walls. Chapter 5 design of wood framing the principal method of design for woodframed construction has historically been allowable stress design asd.
Shear walls are generally used in highrise buildings subject to lateral wind and seismic forces. The strongwall shearwall selector is intended to be used for engineered design. Because many traditional design methods are unsuccessful in predicting the realistic lateral response of conventional wood shear walls, there is a difference of opinion regarding the actual wind and seismic resistance of lightframe buildings. Two weeks ago, i had the chance to present to the young members group of the structural engineering association of metro washington on the topic of multistory lightframe shear wall design. In timber design, one of the current design methodologies for determining the lateral forces is to have a flexible diaphragm with long shear walls acting as the supports for the diaphragm. To control cracking, shear reinforcement is required in the horizontal and vertical. Wood shear wall design wood design and engineering engtips. Preliminary testing of wood structural panel shear walls. Analysis of shear walls for multistorey timber buildings. Gypsum is assumed as interior shear wall sheathing, but the approach will show the difference when not including its capacity. A diaphragm structure results when a series of such vertical and horizontal diaphragms are properly tied together to form a structural unit.
This webinar includes an overview of apas free design tool, the ftao calculator, and explains how it can help engineers and code officials in the design implementation of ftao shear walls, with a focus on asymmetric piers. Prescriptive approaches such as those outlined in awcs 2015 wood frame construction manual wfcm for one. Wood shear wall design oldrunner structural 24 apr 06 14. Design example 1 fourstory wood lightframe structure. Mechanics of multistory segmented shear walls and load combinations 5. The force that is applied to each shear wall in a seismic event is proportional to the mass each wall. A guide for practicing engineers the basic structural elements of an earthquakeresistant building are diaphragms, vertical framing elements, and the foundation. Adaptable shear wall layout in lowrise wood structures. Structural wood design for vertical gravity loads including bending, shear, deflection, vibration, tension, compression, and connections will be introduced. Seismic design of wood lightframe structural diaphragm systems. To facilitate the following design example, a free nonprintable pdf version of the 2015 sdpws and 2015 wfcm is available from the awc website for those who. Shear wall walls used in building construction that aid. This course has been approved by aia 1 hswlu and icc 0. Mechanics of multistory shear walls with force transfer around openings 6.
The simpson strongtie strong wall shearwall selector web application was created to help the designer select the appropriate shearwall solution for a given application in accordance with the latest building code requirements. The basic approach to the lateral design of wood structures is the same as for other. Shear wall designed to resist a change in shape due to loading definitions. R e loads the analysis techniques provided in this presentation are intended to demonstrate one method of analysis. Designs shear walls for sheathing, nailing and holddown connections. Prescriptive approaches such as those outlined in awcs 2015 wood frame construction manual wfcm for one and twofamily dwellingsand 2015 wfcm. Three 10footlong shear walls are placed along corridor wall lines 2 and 3. The course materials are based entirely on the apa publication. In reinforced concrete buildings, the vertical elements are usually either momentresisting frames or. Learn more about the force transfer around openings ftao method of shear wall analysis, including downloadable ftao design tools.
In the design tab, under the design procedures section, uncheck the box include deflection analysis. Shear wall analysis made easy apa the engineered wood. With more openings and larger lateral forces, segmented shear wall approaches do not always produce the most efficient structural design. Seismic design of castinplace concrete special structural. Des41 shear wall design with examples american wood. This webinar includes an overview of apas free design tool, the ftao calculator, and explains how it can help engineers and code officials in the design implementation of ftao shear walls, with a focus on asymmetric piers and multiple openings. Structural design for residential construction presentation 4. This guide expands on the bracedwallpanel allowance in the code reports. Today, virtually all matformed wood structural panels are manufactured with oriented strands, and are commonly called oriented strand board osb. Horizontal elements vertical elements resultant inertial forces g r o u n d m o t io n slide emphasizes that basic design principles apply to wood structures. Click the settings button in the main menu to open the design settings.
Wind loads above, figure 1609, basic wind speed 3second gust, 33 feet above ground, exposure c ibc 2003 zone v 30 mph 1 2 3 70 80 90 western mass. Designs fullheight wall segments, forcetransfer shear walls, and perforated shear walls with wood, gypsum, fiberboard and lumber sheathing. Oriented strand board panels manufactured of compressed wood wafers or strands have been marketed with such names as waferboard and oriented strand board. Building framing systems and best practices building. This presentation will introduce and compare rational analysis methods for designing shear walls with openings and more importunately cover design. A load bearing stud wall design example based on the allowable stress design methods outlined in awcs 2015 national design specification nds for wood construction and 2015 wood frame construction manual along with asce 710 minimum design loads for buildings and other structures will. Updated april 2019 woodworks wood products council. Horizontal and vertical elements of resistance need to be identified and designed. Design of shear resistance of wall 1 level f 2 kn kn f v e 3 knm shear wall 1 v r 4 knm panel thickness v r v e mm nail diameter mm nail spacing mm. A diaphragm is a flat structural unit acting like a deep, thin beam. The simpson strongtie strongwall shearwall selector web application was created to help the designer select the appropriate shearwall solution for a given application in accordance with the latest building code requirements. The following design assumptions are used for development of a comparison of shear wall designs using the 2015 wfcm and 2015 sdpws.
Seismic design of castinplace concrete special structural walls and coupling beams. Chapter 5 design of wood framing the principal method of design for wood framed construction has historically been allowable stress design asd. Shear forces, bending moments and axial loads are maximums at the base of the wall. Two awc standards utilized throughout the nation for a code compliant design of wood shear walls are 2015 wood frame.
Horizontal distribution of forces to individual shear walls. Modeling force transfer around openings in woodframe. Shear walls frame models seismic design of special reinforced masonry shear walls a guide for practicing engineers nehrp seismic design technical brief no. Shear uniform loads within d of support may be neglected. Elements that participate in carrying the load need to be properly detailed for seismic requirements 3. In the perforated shear wall psw shear wall design method, chords are only. Detailed information about the shear wall test program can be found in a technical report yeh et al. General reference risa3d online help release notes tutorials verification problems wood wall panel tutorial masonry wall panel tutorial plate finite element example problems. When diaphragms and shear walls are used in the lateral design of a building, the structural system is termed a. This design guide was developed to provide equivalent wallbracing solutions based on the wallbracing requirements of the international. On the interior side of the wall, specify the sheathing material as none. A shear wall, however, is a vertical, cantilevered diaphragm. Wood shear wall design wood design and engineering eng. Wood shear wall design example the following design assumptions are used for development of a comparison of shear wall designs using the 2015 wfcm and 2015 sdpws.
The contents cover rigid and flexible diaphragms, shear walls, and detailed design examples. Wood shear wall analysis kbvt structural 5 sep 09 09. G r o u n d m o t io n slide emphasizes that basic design principles apply to wood structures. The strong wall shearwall selector is intended to be used for engineered design. Stick framed with plywood shear walls and diaphragms.
Ac establishes guidelines for evaluation of lateral seismic and wind racking loads on prefabricated wood shear panels used in conjunction with wood wall framing to resist lateral, vertical, and transverse loads. In reinforced concrete framed structures the effects of wind forces increase in significance as the structure increases in. Ac prefabricated wood shear panelsapproved march 2018. Wood shear wall design example simpson strongtie structural. Midply shear wall is an improved version of normal plywood shear wall.