APA Engineered Wodd Handbooks Episode 7 pot

5.1 CHAPTER FIVE PREFABRICATED WOOD I-JOISTS AND ENGINEERED RIM BOARD Edward Keith, P.E. Senior Engineer, TSD 5.1 INTRODUCTION While relatively new to the construction industry, when compared to products such as lumber, plywood, or glued laminated timber, both prefabricated wood I-joists and engineered rim board products are rapidly becoming the products of choice by quality- and environmentally-conscious builders alike. Both of these engineered wood products are discussed in detail in this chapter, starting with I-joists and then engineered rim board in Section 5.12. 5.1.1 The Development of Prefabricated Wood I-joists and Rim Board Originally commercialized by the Trus Joist Corporation (now a Weyerhaeuser Company) in the 1960s, engineered wood I-joists owe their beginning, at least in part, to a publication developed by the Douglas Fir Plywood Association (a pre- cursor to APA—The Engineered Wood Association) in 1959 entitled DFPA Spec- ification BB-8, Design of Plywood Beams. 1 This specification, later published as Plywood Design Specification Supplement 2, Design and Fabrication of Glued Plywood-Lumber Beams, 2 outlined the original design procedures that ultimately provided the basis for current design recommendations. The first universally recognized standard for wood I-joists was ASTM D5055, Standard Specification for Establishing and Monitoring Structural Capacities of Prefabricated Wood I-Joists. 3 This consensus standard provides guidelines for the evaluation of mechanical properties, physical properties, and quality of wood I- joists and is the current common testing standard for I-joists. However, since ASTM D5055 does not specify required levels of performance, individual manufacturers of I-joists generally have their own proprietary company standards that govern the everyday production practice for their products. The common sizes and design 5.2 CHAPTER FIVE properties for I-joists are dictated by the market and the major I-joist manufacturers have similar product offerings. Under the current building code rules and procedures, I-joist manufacturers can gain code recognition through evaluation reports provided by various code agencies, such as ICBO, BOCA, and SBCCI. For example, ICBO Evaluation Services AC14, 4 Acceptance Criteria for Prefabricated Wood I-Joists, provides guidelines on imple- menting performance features of the Uniform Building Code (UBC). Although ASTM D5055 and ICBO AC14 provide guidance for developing proprietary design values, no standard performance levels or grades are presented in the documents. The lack of a code-recognized standard that recognizes performance levels has resulted in individual manufacturing standards being promulgated by the manufac- turers covering their respective proprietary I-joist products. Each standard has the potential for having differing installation details, allowable spans, web penetration requirements, allowable stresses, etc. Some manufacturers feel that this lack of standardization has slowed the rate of acceptance of these products within the mar- ket place. As the history of other building materials such as plywood and oriented strand board (OSB) has shown, some degree of standardization of the industry is inevitable. Also inevitable is that along with standardization will come greater man- ufacturing efficiencies and greater use in construction. To fill this need for standard performance levels, APA, in conjunction with several I-joist manufacturers, is developing performance-based standards for performance-rated wood I-joist products. The first such APA performance standard is for the use of wood I-joists in residential floors, designated as PRI-400. 5 It should be noted that this is a voluntary standard and not all I-joist manufacturers have chosen to produce PRI-400 products. Since APA has promulgated the PRI-400 standard, much of the information presented in this chapter will be based on this standard. However, this does not preclude the use of any wood I-joists to achieve similar intended functions. Also manufacturers who do manufacture the PRI-400 products may also manufacture a proprietary series of I-joists for which they have obtained individual ES or NES code reports. While clearly a good idea from the start for a number of structural reasons that will be discussed in detail in this chapter, the increased use of engineered wood products such as wood I-joists and engineered wood rim board in construction will have a positive impact on the environment, from the standpoint of reducing demand for products from older-growth forests. Historically, residential floors have been framed with 2 ϫ 10s (38 ϫ 235 mm) and 2 ϫ 12s (38 ϫ 305 mm). These sizes had to be milled from trees that were at least 18 in. (460 mm) in diameter, neces- sitating the use of older-growth trees. Engineered wood I-joists and rim board prod- ucts are both made out of a number of engineered wood components, all currently being made economically out of second- and third generation plantation forests. No longer requiring the log sizes only found in older forests, these engineered wood products also permit the use of fast-growing species for which there was no com- mercial value just a few years ago. Engineered wood products such as I-joists and rim board have led the way in the early green building movement. Figure 5.1 illustrates the use of wood I-joists and structural wood panel rim board. 5.2 PREFABRICATED WOOD I-JOISTS 5.2.1 Growth of the Industry Figure 5.2 shows market trends for North American (United States and Canada) I- joists from 1980 through 2000. The source of the data can be found in the legend PREFABRICATED WOOD I-JOISTS AND ENGINEERED RIM BOARD 5.3 FIGURE 5.1 Engineered wood products used in a residential floor system. 0 100 200 300 400 500 600 700 800 900 1000 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 I-Joist Market Trends Year Million Lineal Feet FIGURE 5.2 Engineered wood I-joists market growth. (Market information based on APA.) 6,7 5.4 CHAPTER FIVE Web Flange FIGURE 5.3 Engineered wood I-joist. to the graph. 6,7 The residential market has been the driver in the United States and Canada, accounting for about 90% of the volume increase in the last 4 years. Remodeling and nonresidential construction uses are also increasing, and these markets will provide for even more market volume growth in the future. As shown by Fig. 5.2, the total U.S. and Canadian I-joist production was approximately 890 million lineal feet (271 million lineal meters) in 2000. As engineered wood I-joists only represent about 1 ⁄ 3 of the raised floor joist market in single- and multifamily residential construction and only a negligible amount of the wood roof framing market, it can be seen that tremendous domestic market potential remains to be tapped. 5.2.2 What Is an APA Performance Rated I-Joist? The APA Performance Rated I-joist (PRI) is an I-shaped engineered wood structural member designed for use in residential floor and roof construction (see Fig. 5.3). PRI I-joist products are manufactured under the rigorous quality assurance standards of APA—The Engineered Wood Association. Other I-joist products manufactured in accordance with other proprietary code evaluation reports may fulfill the same purpose. Performance Rated I-joists are identified by their net depth followed by a des- ignation such as ‘‘PRI-30’’ that relates to the joist design properties. These desig- nations will be covered later in detail. In order to be classified as a PRI, the joist is limited to a L/480 live load maximum deflection (where L ϭ span) for glued- nailed residential floor applications, a criterion that provides superior floor perform- ance. PRIs are manufactured to strict tolerances with the following characteristics: • Flanges are either sawn lumber or structural composite lumber, typically LVL. The top flange is of the same type and grade of material as the bottom flange. The net flange size depends on the material used. PREFABRICATED WOOD I-JOISTS AND ENGINEERED RIM BOARD 5.5 TABLE 5.1 Designations for APA Performance Rated I-Joists Net depth Joist designation 9 1 ⁄ 2 in. PRI-20 PRI-30 PRI-40 PRI-50 PRI-60 11 7 ⁄ 8 in. PRI-20 PRI-30 PRI-40 PRI-50 PRI-60 PRI-70 PRI-80 PRI-90 14 in. PRI-40 PRI-50 PRI-60 PRI-70 PRI-80 PRI-90 16 in. PRI-40 PRI-50 PRI-60 PRI-70 PRI-80 PRI-90 For SI: 1 in. ϭ 25.4 mm. • Webs consist of wood structural panels, which can be plywood or OSB. All panels are classified as Exposure 1 or Exterior and are typically 3 ⁄ 8 in. (9.5 mm) in thickness. • All PRIs are assembled using exterior-type adhesives per ASTM D2559. 8 • APA PRIs are available in four depths as shown in Table 5.1. • While PRIs of the same depth may be manufactured with various flange widths depending on the product designator, flange width is an important design consid- eration when specifying hangers. Unless the designer is very specific on his plans, he may not know what the actual width of the I-joist installed will be. Often designers and builders will insist that the I-joist supplier provide the hangers as well. • Most mills supply I-joists to distributors and dealers in lengths up to 60 ft (18.30 m). These are then cut to frequently used lengths such as 16–36 ft (4.90–11 m). Check local supplier for availability. It should be noted that many manufacturers produce I-joists for the commercial building market that are beyond the scope of APA Performance Rated I-joists. These I-joists are typically manufactured in depths of 18–30 in. or deeper in 2 in. depth 5.6 CHAPTER FIVE increments. Since no industry standard exists for these products, manufacturers must obtain building code Evaluation Service Reports prior to marketing. However, while these products are deeper than the PRIs, many of the design and construction phi- losophies presented in this chapter for PRIs are also applicable to other I-joists. 5.2.3 I-Joist Manufacturing Process Wood I-joists are manufactured out of a number of different flange and web ma- terials. As such, the manufacturing processes vary slightly to accommodate the material differences. In general, however, I-joists are manufactured in one of two basic methods: in fixed lengths or in continuous lines. The fixed-length method gets its name from the fact that the flange stock— usually LVL for this method—arrives at the assembly point in finite lengths, usually around 60–65 ft (18.3–19.9 m) long. A wedge-shaped groove is machined into the flange material. The geometry of this groove is essential to the manufacturing pro- cess because its wedge shape provides the clamping pressure at the web-to-flange joint that is required by the adhesive to provide a good glue bond. The adhesives used are fully waterproof and are required by the standard to meet the requirements of ASTM D2559. After the flanges are initially pressed on to the web, the com- pleted I-joists are carefully moved to the adhesive curing station of the manufac- turing process. Radio frequency, microwave, or simply storing in a hot environment are three of the curing methods used, depending on the adhesive system used and physical plant layout. Once the adhesive cure has been accomplished, the joists are trademarked, bundled together and wrapped for shipment to the distributors (see Fig. 5.4). The continuous-line method is most often used with sawn lumber flanges. In order to manufacture long-length I-joists, the flanges must be made in equally long lengths. When sawn lumber flanges are used, shorter lengths of lumber are finger- jointed together to form long lengths in a continuous process. Because the end joint is a structural joint, it does not matter where it occurs along the length of the I- joist. After end jointing, the joint moves through a radio frequency or microwave curing station to cure the adhesive in the joint. At the next station in the process, the groove is machined in the continuous flange. With two parallel flange lines operating simultaneously, the output of these lines is joined by the station that applies the adhesive to the grooves and inserts the web elements. These elements are initially pressed together as described previously, and the continuous I-joist is cut to usable lengths—as in the fixed length process, about 60–65 ft (18.3–19.9 m). The final curing of the flange-to-web joints can occur either before or after the cut-to-size operation depending on the curing method used. The I-joists are then trademarked, bundled, and wrapped for shipment to the distributors (see Fig. 5.5). 5.3 MOISTURE PERFORMANCE OF ENGINEERED WOOD VS. LUMBER All engineered wood composites have many characteristics in common. They are stronger, more dimensionally stable, more homogeneous, better utilize available natural resources and, are typically more builder-friendly than sawn lumber. From a proper design and detailing point of view, there is another common characteristic 5.7 PR TM 4014" SPACING 12 oc 16 oc 19.2 oc 24 oc SIMPLE SPAN 24-4 22-1 20-2 18-0 MULTIPLE SPAN 25-6 22-1 20-1 18-0 Performance Rated Wood I-Joist for Glued Residential Floors MILL 0000 • PRI-400 Bundled and wrapped for shipment Energy applied to cure adhesive Fixed-length I-joists pressed together Adhesive applied Grooves machined in flanges ends and edges machined in webs Web stock Flange stock FIGURE 5.4 I-joist manufacturing process—fixed-length process. 5.8 PR TM 4014" SPACING 12 oc 16 oc 19.2 oc 24 oc SIMPLE SPAN 24-4 22-1 20'-2 18-0 MULTIPLE SPAN 25-6 22-1 20'-1 18-0 Performance Rated Wood I-Joist for Glued Residential Floors MILL 0000 • PRI-400 PR TM 4014" SPACING 12 oc 16 oc 19.2 oc 24 oc SIMPLE SPAN 24-4 22-1 20'-2 18-0 MULTIPLE SPAN 25-6 22-1 20'-1 18-0 Performance Rated Wood I-Joist for Glued Residential Floors MILL 0000 • PRI-400 End joints machined Grading Sawn lumber flange stock Glue applied to end joints Continuous joists cut to length Flange stock pressed together Energy applied to cure adhesive Groove machined into continuous flange Adhesive applied to continuous groove Web stock Stock cut to size Ends and edges machined Adhesive added to ends and edges Flanges and webs pressed together Energy applied to cure adhesive Bundled and wrapped for shipment FIGURE 5.5 I-joist manufacturing process—continuous-line process using sawn lumber flanges. PREFABRICATED WOOD I-JOISTS AND ENGINEERED RIM BOARD 5.9 that it is important to understand. This characteristic is that all engineered wood components are manufactured in a relatively dry state. The moisture content of engineered wood products at the time of manufacture ranges from approximately 4–12%. During the manufacturing process, the wood-based resource must be dried to these levels to ensure that a good glue bond is developed. A range of values is given because some adhesive systems used in some products have different moisture requirements. It is also important to realize that these are not average moisture contents as traditionally measured. If a certain adhesive system requires a maximum 6% mois- ture content to develop an adequate glue bond, then every piece must meet that maximum during fabrication. A traditional average where 50% are above the max- imum and 50% are below just doesn’t work. Only those pieces at or below the maximum will ever get to the marketplace. Traditional dry lumber, on the other hand, is dried to a much higher moisture content, typically 19%, although some lumber is dried to 16%. Because of natural variability, the range of moisture content of the lumber pieces in a given bundle may vary widely. A given lumber element may even have moisture gradients along the length or across the width. In service, however, such as in a residential structure, after four to eight months of drying, all wood elements will reach an equilibrium moisture content of 6–10%, depending on the season and location of the structure. Because the engineered wood products are very close to this normal equilibrium moisture content as manufac- tured, and because they are typically shipped in a waterproof protective wrapping, they take on little or no additional moisture during this period. As such, their dimensions vary imperceptibly during this period. The sawn lumber, however, dries down during this period through a relatively large range of moisture content. Along with drying comes an equally significant shrinkage. As Fig. 5.6 shows, a 14 in. (337 mm) deep sawn lumber element can shrink as much as 3 ⁄ 4 in. (19 mm) in its depth as it cycles from the as-dried to in-service equilibrium moisture content. This difference in behavior between solid-sawn lumber and engineered wood can lead to structural failure if the designer is not careful. 5.3.1 I-joists and Rim Board Used Together in an Engineered Wood System APA EWS I-joists and APA EWS Rim Board products (discussed in Section 5.12) are made in 9 1 ⁄ 2 ,11 7 ⁄ 8 , 14, and 16 in. (241, 302, 356, and 406 mm) net depths. It is no accident that these sizes are not compatible with, and are larger than, tradi- tional lumber net depths for 2 ϫ 10s, 2 ϫ 12s, 2 ϫ 14s, and 2 ϫ 16s (38 ϫ 241, 38 ϫ 302, 38 ϫ 356, and 38 ϫ 406 mms). There are many applications in roofing systems and especially residential floors, where other elements are used in con- junction with the I-joists for the express purpose of transferring load through the floor system without overloading the floor joists. Some examples of these other elements are blocking panels over an interior bearing wall and rim or starter joists. In these cases, the vertical load from the structure above the plane of the floor is transferred through the floor into the structure/foundation below by way of direct bearing on the blocking panels and rim or starter joist. Because the load is transferred in direct bearing, it is essential that the blocking panels and rim or starter joist be the same height as the floor joist. Solid-sawn lumber cannot be used in applications like these because of the very likely potential for shrinkage. Shrinkage by as little as 1 ⁄ 8 in. (3 mm) can be enough to transfer the 5.10 CHAPTER FIVE SAWN LUMBER GLULAM BEAM Green 15-1/4" 5% 3/4" 8% 12% 24" 1% 1/4" 8% FIGURE 5.6 Shrinkage of glulam compared with sawn lumber. Load-bearing wall above I-joist Lumber blocking Lumber blocking cut to fit at 16% moisture content Load-bearing wall above Lumber blocking – after shrinkage Bearing failure FIGURE 5.7 Effects of differential shrinkage on load transfer. vertical loads from the walls above directly to the floor joists, thus inducing possible bearing or reaction overload conditions at these locations. The solution to the prob- lem is to use engineered wood products for these applications. They are manufac- tured in the correct depths and have the same dimensional stability properties (see Fig. 5.7). While the previous discussion concerns vertical loads, the same is true of lateral loads such as those caused by wind and seismic events. The small gap between the floor sheathing above and the sawn lumber rim joist or blocking panel below re- [...]... 6.18 6.18 6.18 6.18 6.18 482 480 584 613 802 881 3860 5350 5320 71 20 75 25 9535 4130 5560 5690 74 05 8050 9915 171 0 171 0 171 0 171 0 171 0 2125 2500 2040 2500 2335 3020 3355 1200 1015 1200 1160 1280 1400 7. 28 7. 28 7. 28 7. 28 7. 28 7. 28 6 57 663 79 9 841 1092 1192 4535 6 270 6250 8350 8845 11,205 4850 6520 6685 8680 9460 11,650 1 970 1 970 1 970 1 970 1 970 2330 2500 2040 2500 2335 3020 3355 1200 1015 1200 1160 1280... ft, ft, ft, 3 in 1 in 2 in 9 in 10 in 10 in 1 in 8 in 9 in 9 in 1 17 8؆ PRIs Live load deflection ϭ L / 480 Maximum I-joist designation 1 17 8؆ 1 17 8؆ 1 17 8؆ 1 17 8؆ 1 17 8؆ 1 17 8؆ 1 17 8؆ 1 17 8؆ 1 17 8؆ 1 17 8؆ 1 17 8؆ 1 17 8؆ 1 17 8؆ 1 17 8؆ 1 17 8؆ 1 17 8؆ PRI-20 PRI-30 PRI-40 PRI-50 PRI-60 PRI -70 PRI-80 PRI-90 PRI-20 PRI-30 PRI-40 PRI-50 PRI-60 PRI -70 PRI-80 PRI-90 Simple span Spacing 16 in o.c 16 in o.c 16 in... PRI-60 PRI -70 PRI-80 PRI-90 16؆ PRI-40 PRI-50 PRI-60 PRI -70 PRI-80 PRI-90 Depth Vd lbf IR e lbf ER f lbf Kg 106 lbf 2265 2910 2520 3420 3 470 1120 1120 1120 1120 1120 170 0 1905 2160 2040 2160 830 945 1080 1015 1080 4.94 4.94 4.94 4.94 4.94 2910 371 5 3145 4 375 4335 5600 6130 77 70 3025 3860 3365 4550 4635 5820 6555 8080 1420 1420 1420 1420 1420 1420 1420 1925 170 0 1905 2500 2040 2500 2335 276 0 3355 830... 10 in 5 in 8 in 10 in 16؆ PRI-40 PRI-50 PRI-60 PRI -70 PRI-80 PRI-90 27 27 28 29 31 32 ft, ft, ft, ft, ft, ft, 0 0 7 0 4 2 in in in in in in 24 24 26 26 28 29 ft, ft, ft, ft, ft, ft, 0 8 1 5 6 3 21 23 24 24 26 27 ft, ft, ft, ft, ft, ft, 11 in 4 in 7 in 11 in 11 in 7 in 19 20 23 23 25 25 ft, ft, ft, ft, ft, ft, 7 2 0 1 1 9 in in in in in in 16 15 17 17 19 20 ft, ft, ft, ft, ft, ft, 4 in 1 in 10 in 3 in... 17 18 18 19 20 ft, ft, ft, ft, ft, 2 8 1 5 8 in in in in in 14 16 15 17 18 ft, ft, ft, ft, ft, 10 in 10 in 8 in 9 in 5 in 13 15 14 16 16 ft, ft, ft, ft, ft, 6 4 3 8 9 in in in in in 11 12 12 13 14 ft, ft, ft, ft, ft, 1 6 9 5 2 in in in in in 8 9 10 10 10 ft, ft, ft, ft, ft, 3 4 7 0 7 in in in in in 5 6 7 6 7 ft, ft, ft, ft, ft, 5 2 0 7 0 in in in in in 1 17 8؆ PRI-20 PRI-30 PRI-40 PRI-50 PRI-60 PRI -70 ... ft, ft, 3 4 3 0 3 5 7 7 in in in in in in in in 5 6 8 6 8 7 9 11 ft, ft, ft, ft, ft, ft, ft, ft, 5 2 1 7 1 7 0 0 in in in in in in in in 14؆ PRI-40 PRI-50 PRI-60 PRI -70 PRI-80 PRI-90 23 26 27 28 30 31 ft, ft, ft, ft, ft, ft, 3 in 6 in 4 in 6 in 10 in 8 in 20 20 23 23 28 28 ft, ft, ft, ft, ft, ft, 1 in 2 in 8 in 2 in 0 in 10 in 18 16 20 19 24 27 ft, ft, ft, ft, ft, ft, 4 in 9 in 7 in 3 in 11 in 1 in... 16 ft, 6 in Hem-firb 17 ft, 7 in Douglas fir-larchb 17 ft, 10 in Southern pinec 18 ft, 10 in Simple span Spacing 16 in o.c 16 in o.c 16 in o.c 16 in o.c 16 in o.c 19.2 in o.c 19.2 in o.c 19.2 in o.c 19.2 in o.c 19.2 in o.c 15 15 16 16 17 14 14 15 15 16 ft, ft, ft, ft, ft, ft, ft, ft, ft, ft, Multiple span 2 in 8 in 6 in 4 in 4 in 4 in 10 in 7 in 5 in 4 in 16 17 17 17 18 14 16 15 16 17 ft, ft, ft, ft, ft,... PRI-40 PRI-50 PRI-60 16 17 18 17 19 ft, ft, ft, ft, ft, 7 in 1 in 0 in 10 in 0 in 14 15 15 16 17 ft, ft, ft, ft, ft, 11 in 8 in 9 in 4 in 4 in 13 14 14 15 16 ft, ft, ft, ft, ft, 7 in 10 in 4 in 5 in 4 in 12 13 12 14 15 ft, ft, ft, ft, ft, 2 in 9 in 10 in 5 in 1 in 10 11 10 12 12 ft, ft, ft, ft, ft, 3 8 8 7 7 in in in in in 6 7 8 8 8 ft, ft, ft, ft, ft, 9 in 9 in 9 in 4 in 10 in 1 17 8؆ PRI-20 PRI-30 PRI-40... 18 19 19 20 21 22 23 ft, ft, ft, ft, ft, ft, ft, ft, 2 9 7 6 8 0 8 4 in in in in in in in in 17 17 18 18 19 19 21 22 ft, ft, ft, ft, ft, ft, ft, ft, 2 in 9 in 2 in 5 in 6 in 10 in 4 in 0 in 15 16 16 17 18 18 19 20 ft, ft, ft, ft, ft, ft, ft, ft, 5 in 7 in 3 in 3 in 3 in 7 in 11 in 6 in 12 14 13 15 16 17 18 19 ft, ft, ft, ft, ft, ft, ft, ft, 4 0 7 1 0 3 6 0 in in in in in in in in 8 9 11 10 11 11 12 13... ft, ft, ft, ft, 3 in 0 in 3 in 5 in 11 in 7 in 8 6 8 7 9 11 ft, ft, ft, ft, ft, ft, 1 in 7 in 1 in 7 in 10 in 0 in 16؆ PRI-40 PRI-50 PRI-60 PRI -70 PRI-80 PRI-90 25 27 29 30 34 35 ft, ft, ft, ft, ft, ft, 3 in 0 in 8 in 11 in 2 in 1 in 21 20 24 23 30 31 ft, ft, ft, ft, ft, ft, 10 in 2 in 9 in 2 in 0 in 11 in 19 16 20 19 24 27 ft, ft, ft, ft, ft, ft, 11 in 9 in 7 in 3 in 11 in 9 in 16 13 16 15 19 22 ft, . PRI-40 PRI-50 PRI-60 PRI -70 PRI-80 PRI-90 482 480 584 613 802 881 3860 5350 5320 71 20 75 25 9535 4130 5560 5690 74 05 8050 9915 171 0 171 0 171 0 171 0 171 0 2125 2500 2040 2500 2335 3020 3355 1200 1015 1200 1160 1280 1400 7. 28 7. 28 7. 28 7. 28 7. 28 7. 28 16 ؆ PRI-40 PRI-50 PRI-60 PRI -70 PRI-80 PRI-90 6 57 663 79 9 841 1092 1192 4535 6 270 6250 8350 8845 11,205 4850 6520 6685 8680 9460 11,650 1 970 1 970 1 970 1 970 1 970 2330 2500 2040 2500 2335 3020 3355 1200 1015 1200 1160 1280 1400 8.32 8.32 8.32 8.32 8.32 8.32 For. PRI-20 PRI-30 PRI-40 PRI-50 PRI-60 PRI -70 PRI-80 PRI-90 253 280 330 322 396 420 5 47 604 2910 371 5 3145 4 375 4335 5600 6130 77 70 3025 3860 3365 4550 4635 5820 6555 8080 1420 1420 1420 1420 1420 1420 1420 1925 170 0 1905 2500 2040 2500 2335 276 0 3355 830 945 1200 1015 1200 1160 1280 1400 6.18 6.18 6.18 6.18 6.18 6.18 6.18 6.18 14 ؆ PRI-40 PRI-50 PRI-60 PRI -70 PRI-80 PRI-90 482 480 584 613 802 881 3860 5350 5320 71 20 75 25 9535 4130 5560 5690 74 05 8050 9915 171 0 171 0 171 0 171 0 171 0 2125 2500 2040 2500 2335 3020 3355 1200 1015 1200 1160 1280 1400 7. 28 7. 28 7. 28 7. 28 7. 28 7. 28 16 ؆. PRI-20 PRI-30 PRI-40 PRI-50 PRI-60 PRI -70 PRI-80 PRI-90 253 280 330 322 396 420 5 47 604 2910 371 5 3145 4 375 4335 5600 6130 77 70 3025 3860 3365 4550 4635 5820 6555 8080 1420 1420 1420 1420 1420 1420 1420 1925 170 0 1905 2500 2040 2500 2335 276 0 3355 830 945 1200 1015 1200 1160 1280 1400 6.18 6.18 6.18 6.18 6.18 6.18 6.18 6.18 14 ؆