Masonry detailing series international masonry institute. Excluding the independent garden variety, the nonbearing wall appears only where loads are carried by other members, as in heavy timber and other skeletal structures. The wall weight is estimated to be halfway between fully grouted. Design of masonry structures, third edition of load. The exterior non load bearing walls consisted of 8 thick partially grouted concrete masonry units cmu supported on 2 wide x 1 deep concrete footing see figures 1 to 3. Loadbearing dimension lumber for studs, plates and headers shall be identified by a grade mark of. Load carrying capacity of hollow concrete block masonry. Mineral fiber wall boards mineral fiber wall boards.
Other articles where nonloadbearing wall is discussed. Astm c129, standard specification for nonload bearing concrete masonry units. These units are intended for use in nonloadbearing partitions, but under certain conditions they may be suitable for use in nonloadbearing exterior walls above grade where effectively. With reinforcing steel located in the center of the wall, wall strength will be the same under either a positive or negative moment of the same magnitude. It essentially consists of thick, heavy masonry walls of brick or stone that support the entire structure.
Load bearing masonry construction was the most widely used form of construction for large buildings from the 1700s to the mid1900s. Connecting precast planks to concrete masonry walls. Cmu light weight, 105 pcf cmu medium weight, 125 pcf cmu normal weight, 5 pcf clay solid nominal thickness. By contrast, a non load bearing wall, sometimes called a partition wall, is responsible only for holding up itself. Unit weight classifications are the same, as well as referenced standards for aggregates, cements, sampling, and testing. But if the wall runs perpendicular at a 90degree angle to the joists, there is a good chance that it is loadbearing. Load bearing masonry construction load bearing walls how.
When piping or ductwork is placed in or partly in an exterior wall or interior load bearing wall, necessitating cutting, drilling or notching of the top plate by more than 50 percent of its width, a galvanized metal tie not less than 0. The requirements of this standard are similar to those of c90 except that the units are designed for non loadbearing applications. Load carrying capacity of hollow concrete block masonry column. C90 specification for loadbearing concrete masonry units. How to distinguish between nonload bearing and load bearing. Veneer wall system provides cladding and only resists transfers wind loads to a structural backup structural load bearing wall can be cladding but also provides load bearing system water penetration through exterior masonry elements exposed to rain should be anticipated. Design of masonry structures, third edition of load bearing. For the purpose of this report, the wall that fell is identified as the east wall by the field personnel, although contract drawings identify it as the north wall. Over 40 pdf technical articles on concrete masonry units, architectural cmus, colors, section 4200 specification, concrete block water repellancy, block job issues, order forms, job site assistance. Loadbearing walls may be designed in a manner similar to that for columns but including the design requirements for nonloadbearing walls. The masonry detailing series mds is an exhaustive collection of illustrative construction details and diagrams produced by international masonry institute imi for architects and engineers to use as a design resource. Generally, when the wall in question runs parallel to the floor joists above, it is not a loadbearing wall.
Differences in overturning anchorage for walls are shown in figure 55. This is the most common masonry mortar used in nonstructural. This thinner wall requires a form of weatherresistive exterior coating to prevent water from entering the interior. Pdf this is a study on nonbearing masonry walls, in a high. Thicken slab for cmu wall abusementpark structural feb 10 11. A hollow unit is that unit which has core void area greater than 25% of the gross area. Interior nonload bearing cmu wall structural engineering. A wall which doesnt help the structure to stand up and holds up only itself is known as a nonload bearing wall. Masonry wall systems wbdg whole building design guide.
Exterior walls generally support the floor or roof above them. Bed joint reinforcement, cracking, nonloadbearing walls, case studies. Dec 12, 2011 non load bearing wall systems non load bearing wall details release. Modern steel and reinforcedconcrete frames require exterior walls only for shelter and sometimes dispense with them on the. Over 40 pdf technical articles on concrete masonry units, architectural cmus, colors, section 4200 specification, concrete block water repellancy, block job. Load bearing masonry construction load bearing walls. How to distinguish between nonload bearing and load. The exterior nonload bearing walls consisted of 8 thick partially grouted concrete masonry units cmu supported on 2 wide x 1 deep concrete footing see figures 1 to 3. Standard specification for nonloadbearing concrete masonry. The masonry is grouted in the cells containing reinforcement, but it is not grouted solid. All masonry exterior, bearing and shear walls structural walls will be.
A wall composed of a single unit of masonry in thickness a one brick or block thick wall. This compilation includes hundreds of details for brick, block, and stone masonry systems, as well. It is connected at base with dowels, however, not connected to the underside of the concrete slab at the top. Tm 58093 masonry structural design for buildings wbdg. Astm c129, standard specification for non load bearing concrete masonry units. Masonry walls that are required for load bearing purposes may also function as shear walls in addition to enclosing and dividing spaces, unlike in steel structures where the frame is the only function. Pdf nonbearing masonry walls behavior and influence to high. The requirements of this standard are similar to those of c90 except that the units are designed for nonloadbearing applications.
Chapter 5, walls 87 differences in these bracing wall configurations include sheathing materials, minimum bracing length, extent of sheathing, and anchorage at the wall base. Figure 5 concentrated loads on masonry wall solution the bearing areas are calculated as follows. C140 test methods for sampling and testing concrete masonry units and related units. These are subject to axial compression loads in addition to their own weight and, where there is eccentricity of load or lateral loads, to flexure. Area separation wall steel stud nonloadbearing fire rating. Because most fire wall criteria relating to fireresistance rating, protected openings and penetrations, and vertical and horizontal continuity are prescriptive, the designers primary challenge when engineering and detailing a concrete masonry fire wall relates to maintaining the structural stability of the wall under fire. Loadbearing wall n s or m nonloadbearing wall ob n or s parapet wall n s exterior, at or below grade foundation wall, retaining wall, manholes, sewers, pavements, walks, and patios s cm or n interior loadbearing wall n s or m nonloadbearing partitions o n interior or exterior tuck pointing see appendix x3 see appendix x3 c 270 07. In this first slide, we see examples of different applications of masonry. Because most fire wall criteria relating to fireresistance rating, protected openings and penetrations, and vertical and horizontal continuity are prescriptive, the designers primary challenge when engineering and detailing a concrete masonry fire wall relates to maintaining the structural stability of the wall under fire conditions. A nonload bearing wall doesnt support floor roof loads above it is not a part of the structural frame system. These units are intended for use in nonloadbearing partitions, but under certain conditions they may be suitable for use in nonloadbearing exterior walls. Load bearing walls support the weight of a floor or roof structure above and are so named because they bear a load. A non load bearing self supporting wall subject to transverse lateral loads, and laterally supported by vertical or horizontal structural member where necessary. January 19, 2015 installation guide for adhered manufactured stone veneer, 4th edition 2nd printing adhered manufactured stone veneer amsv lightweight, architectural, non loadbearing product that is manufactured by.
Masonry can form structural elements typically bearing walls, columns. Wall construction shall be capable of accommodating all loads imposed according to section r301. Astm c129, standard specification for nonloadbearing concrete masonry units. Bearing walls usually consist of 2x4 or 2x6 studs, masonry, brick or concrete, with or without openings. Astm c90, standard specification for loadbearing concrete. I have an interior non load bearing 8 cmu wall between concrete floors 110 floor to floor height. It is usually outer leaf is thinner than inner leaf. I would like to connect at the top as well to make sure wall is laterally braced.
Followings are the main features of nonload bearing walls. Referenced documents purchase separately the documents listed below are referenced within the subject standard but are not provided as part of the standard astm standards. The masonry societys tms 402 code defines a partition wall as an interior wall without any structural function. Masonry works, including rendering, amount to 17 % of the total. Astm c129 75 standard specification for nonloadbearing. Nonload bearing walls for nonload bearing walls walls parallel to the floor planks the most important consideration is to laterally brace the wall with the precast concrete plank floor system. Acrobat pdf by clicking on the appropriate format to the right of the drawing title. The views and opinions expressed are those of the authors and not. Rather than the full interaction diagram, only the portion outlined by the dashed box in figure 1 is shown.
Veneer wall system provides cladding and only resists transfers wind loads to a structural backup structuralload bearing wall can be cladding but also provides load bearing system water penetration through exterior masonry elements exposed to rain should be anticipated. Non load bearing means the wall serves as a partition or to mark a boundary such as a half wall. Investigation of the april 18, 20 partial collapse of a. However, there are cases where a bearing wall is parallel to the joists. It is very rarely used today for large buildings, but smaller residentialscale structures are being built. Topic 12 deals with the seismic design of masonry structures. Introduction these are the concrete blocks either hollow or solid. They do not bear any other weight of the propertys structure other than its own. Load bearing wall n s or m non load bearing wall ob n or s parapet wall n s exterior, at or below grade foundation wall, retaining wall, manholes, sewers, pavements, walks, and patios s cm or n interior load bearing wall n s or m non load bearing partitions o n interior or exterior tuck pointing see appendix x3 see appendix x3 c 270 07.
Thicken slab for cmu wall structural engineering general. Also referred to as curtain walls, nonbearing walls are used primarily as room dividers, and generally serve no other purpose. Bearing walls are walls that typically support roof loads, floor loads andor wall loads. The provisions of this chapter shall control the design and construction of all walls and partitions for all buildings. They may be used for both load bearing as well as non load bearing walls.
Nonload bearing walls are walls inside a property that do not support any structural weight of a building. Reprint or republications of this manual should include a credit substantially as follows. When piping or ductwork is placed in or partly in an exterior wall or interior loadbearing wall, necessitating cutting, drilling or notching of the top plate by more than 50 percent of its width, a galvanized metal tie not less than 0. The international building code requires wall assemblies in types i through iv construction to comply with nfpa 285. Shear stress is determined by fv va nv where anv is net shear area. C129 75 standard specification for non load bearing concrete masonry units. Nov 02, 2017 non load bearing means the wall serves as a partition or to mark a boundary such as a half wall.
A nonload bearing wall doesnt support floor roof loads above. Standard specification for nonloadbearing concrete masonry units. May 16, 2016 nonload bearing walls are walls inside a property that do not support any structural weight of a building. One common method requires the plank adjacent to the wall to bear on the wall at least 3 inches figure 3. It is a standardized fi re test procedure for evaluating the performance of exterior, nonload bearing wall assemblies and panels that are constructed.
552 236 25 171 1022 452 656 1416 633 1161 1374 366 557 1099 97 1308 552 379 786 1294 1464 1324 655 816 810 1168 568 1419 323 191 1306 494 1346 634 205 1355 1000 1190 309 1133 725 968 1324 645 269