2012 WFCM PDF

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Figure 1. The WFCM includes design and construction provisions for high wind, seismic, and snow loads for connections, wall systems, floor systems, and roof systems. A range of structural elements are covered, including sawn lumber, structural glued laminated timber, wood structural sheathing, I-joists, and trusses.

Ground snow loads in the WFCM take into account both balanced and unbalanced snow load conditions. Those provisions are relatively unchanged in ASCE , resulting in net reductions to snow loads where unbalanced cases govern. New risk-based maps generally reduce areas of highest seismic risk along the New Madrid fault and in the Charleston, SC area.

Revised map contours will influence Seismic Design Categories of some geographic areas. Wind speeds are higher, but load factors for design are also adjusted so that the net effect will be a reduction of wind pressures in some regions Line There are separate wind speed maps for each Risk Category in the code, and Exposure D will become applicable again in hurricane prone regions.

The local authority having jurisdiction should be consulted to determine whether conversion to a mph basis is permissible. Walls sheathed with wood structural panels can be used to resist uplift alone, or simultaneously resist uplift and shear from wind forces. Section 3. Capacities are based on provisions in the NDS and have been verified by full scale testing. The primary characteristic of this method is increased nailing of panels to framing to provide a continuous load path and enable uplift loads to be transferred to existing wall anchorage at the foundation.

A desire to investigate the inherent uplift capacity of nailed wood structural panel shear walls was the impetus for development of this design method. Among the concerns is the number of tie-downs required for shear walls, which can present both cost increases and practical construction challenges.

Traditional methods of providing for uplift resistance with additional tie-downs at shear walls can be cumbersome and expensive. An integral Appendix of the WFCM still contains uplift strap and ridge strap capacity tables for those wishing to maintain that option.

Shear wall story offset provisions were clarified in the WFCM. Shear wall segments are permitted to be offset out-of-plane from the story below by a maximum distance equal to the depth, d, of the floor joists Figure 2 , where all of the following conditions are met:.

Design values for structural lumber, structural glued laminated glulam timber, and fasteners were incorporated in the integral Supplement of the WFCM. For fastener design values, the NDS is the reference standard. Design properties for horizontal diaphragms and shear walls were incorporated in the integral Supplement of the WFCM. A comprehensive table listing section by section changes to the WFCM, including modifications to Supplement and Appendix material, is available at www.

The WFCM represents the state-of-the-art for design of one- and two-family dwellings for high wind, high seismic, and high snow loads. Its reference in the IBC and IRC will allow for its use in those jurisdictions adopting the latest building code. This article originally appeared in the Winter issue of Wood Design Focus published by the Forest Products Society and is reprinted with permission. American Society of Civil Engineers.

Reston, VA. American Wood Council. Leesburg, VA. Coats, Paul. Wood Design Focus. International Code Council. Washington, DC. Line, Philip and Bill Coulbourne. January December He may be reached at bshowalter awc. Mazikins, P. Eng and Loren Ross, P. In Articles , Code Updates Comments 0. Wind speed conversion. Figure 2. Shear wall story offset limits. No Comments. Leave a Comment Click here to cancel reply. First Name Last Name. Email Website.

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Figure 1. The WFCM includes design and construction provisions for high wind, seismic, and snow loads for connections, wall systems, floor systems, and roof systems. A range of structural elements are covered, including sawn lumber, structural glued laminated timber, wood structural sheathing, I-joists, and trusses. Ground snow loads in the WFCM take into account both balanced and unbalanced snow load conditions. Those provisions are relatively unchanged in ASCE , resulting in net reductions to snow loads where unbalanced cases govern. New risk-based maps generally reduce areas of highest seismic risk along the New Madrid fault and in the Charleston, SC area. Revised map contours will influence Seismic Design Categories of some geographic areas.

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AWC releases 2012 WFCM Workbook

More Wood Construction Short Courses. This unit will provide a chapter by chapter overview of the WFCM which includes provisions for designing wood frame structures for wind, snow, and seismic loads. In addition, this presentation will provide an overview of the significant changes in the WFCM relative to the previous edition. The design example uses plans from a 2-story residence as the basis for a structural design to resist high wind, seismic, and snow loads. The workbook heavily references the WFCM to aid in understanding how to use the time-saving tools and tables provided therein.

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