Basement floor slab design pdf

The design features an open floorplan layout for the living area and includes a great room with gas logs and plenty of builtins. Building the basement concrete construction magazine. Asce, secb course content slab on grades construction. Preventation of hydrostatic uplift pressure underneath of basement floor slab in high water table area.

Shear strength of beamless slabs usually a controlling factor. Although coldformed steel framing for floor systems also is permitted by the irc, it is not covered here. Monolithic slab waterproofing monolithic basement slab. We are installing laminate flooring and one room of tile over an unsealed basement slab. The extra bedroom offers added flexibility for use as a home office or other use. Design, fabrication and testing of a prototype, thinvaulted. Masonry design procedures follow the allowable stress design method of aci530. Whenever you work with any kind of flooring or surface treatment in a belowgrade basement location, the first thing that you have to do is test the moisture content of the floor over several days. Residential foundation guideline johnson county kansas. In most cases, skeletal members such as beams, col umns, and frames made from them can be. Design of concrete floors with particular reference to post. The minimum thickness can be determined by many factors. An example of the design ladder width 900 with steps mm in a building with a height of m and a floor slab thickness of 300 mm lshaped stairwell, march with eabezhnymi steps.

This is a home plan with many great features and flexible options. Wood design procedures are used to design the connections between the foundation system and the structure above and follow the allowable stress design method for wood construction. Concrete slab flooring in basements and below grade. The cement and concrete association of australia is. That is because moisture can often rise from the surrounding ground.

By drying out the basement air, moisture is drawn into the basement more rapidly causing efflorescence and spalling of concrete and further damage to interior finishes. The first floor may provide an additional horizontal reaction similar to the basement floor slab, however, thereby making the wall act as a vertical beam. If your basement has a monolithic slab, its almost always critical that you keep it intact, whereas floating slab floors do fine with concrete breakout. Specific design requirements for concrete floor construction are found in aci 360r for slabsonground, aci 223r for shrinkagecompensating concrete floors. When we were recently asked to design and build another passive house for a client, we began by questioning everything we did on the first project, from the foundation upboth successes and challenges. Design of beam, column, slab, shear wall, stair case, retaining wall, water tank and an isolated footing are done. The building have a shear wall around the lift pit. In houses having a crawl space or basement, firstfloor interior braced walls are supported on double joists, beams, or blocking as shown in figure 34. The two bedrooms are larger than you would expect for a house this size. Twoway joist concrete slab floor waffle slab system analysis and design design the concrete floor slab system shown below for an intermediate floor with partition weight of 50 psf, and unfactored live load of 100 psf. Basement walls just like most other framing systems, a postframe building can be placed on a basement wall designed for post point loads, as illustrated in figure.

The third common configuration is slabongrade construction. Interior membrane or coating is a temporary solution. Stresses in floor slabs on grade resulting from vehicular loads are a function of. The thickness of a floor slab must be determined early in design because the weight of the slab is an important part of the dead load of the structure.

Additional features include two raised bars great for visitors and a sunroombreakfast nook. What is the best way to install floating laminate over. For groundbearing slabs, it is important to design the slab around the type of soil, since some soils such as clay are too. A six storey building for a commercial complex has plan dimensions as shown in figure 1. After this again goes to design menu, concrete frame design, start design \ check of structure then etabs performs the design for every structural element. The basement has exterior waterproofing, drain tiles, and sump pump. We do not have rigid foam installed under the slab unfortunately, so i am thinking we do need. For slabongrade construction in sdcs d1 and d2, when the conditions described above require an interior braced wall line to have a foundation, the foundation depth along that interior wall. Introduction concrete slabs on grade are a very common type of concrete construction. Whereas a floating slab is characterized by a concrete slab floor or slabs that are not connected to the foundation footer beams or walls. The building is located in seismic zone iii on a site with medium soil. The lateral loads are independently resisted by shear walls. This acts as a capillary break to help prevent absorption of ground moisture. Structural wood floors replaces the traditional concreteslab basement floor, with a heated crawl space underneath.

The ideal practice is to use essentially the same technique as for slab on ground basementless floors. Twoway joist concrete slab floor waffle slab system. Concrete floor slab construction process includes erection of formwork, placement of reinforcement, pouring, compacting and finishing concrete and lastly removal of formwork and curing of concrete slab. In houses having a crawl space or basement, first floor interior braced walls are supported on double joists, beams, or blocking as shown in figure 34. How to design a basement floor plan basement design plans unfinished baseme. Slab edge may be responsible for about 60% of the slab s total heat loss certainteed effect of slab edge insulation rem design simulations 8% increase in total heating consumption with no slab edge insulation 62% of heat loss through slab edge 16. See more ideas about basement, basement flooring and floor slab.

Floor slab design floors are designed as slabs on grade. However, before you consider lowering the basement floor, it is. We live in the midwest so lots of temp changes and humidity. Heat loss calculations and principles ced engineering. We have over 2,000 5 bedroom floor plans and any plan can be modified to create a 5 bedroom. Preventation of hydrostatic uplift pressure underneath of.

The third common configuration is slab ongrade construction. A concrete slab is a common structural element of modern buildings, consisting of a flat. The construction and design of concrete slabs on grade. The walls are designed using parameters relevant to the london. This publication provides basic design guidance and construction details for raised wood floor foundations. The modelling and analysis of the structure is done by using staad. The benefit of this type of construction is to provide a more comfortable floor and prevent heaving and sloping caused by soil pressure, typical of concrete basement floors. These slabs may be supported on continuous foundations, piers or piles and grade beams, or grade beams directly on isolated chapter 1 an overview of footings and foundations 9 figure1. Open floor plan layout 5154mm architectural designs. In essence, it is a slab of concrete placed directly onto the ground. For slab ongrade construction in sdcs d1 and d2, when the conditions described above require an interior braced wall line to have a foundation, the foundation depth along that interior wall. Retaining walls, deck with pergola, house plans, projects to. The difficult part of automating concrete design is the floor slab. Calculating heat loss through a basement or slab on grade is.

In any type of soil, lateral soil pressure increases with depth, so tall walls. Information on other aspects, su ch as materials, construction methods, placement of concrete, and finishing techniques, is. A civil engineer must know all the aspects regarding the flat floor system. Slab edge may be responsible for about 60% of the slabs total heat loss certainteed effect of slab edge insulation rem design simulations 8% increase in total heating consumption with no slab edge insulation 62% of heat loss through slab edge 16. The pictorial to the right illustrates the four main sections getting started, foundations, floor framing. The slab thickness depends on the type of loads on the floor slab. Diagonal shoring of the highway retaining wall element will be provided before piling works are undertaken since the piling works will disrupt the existing ground floor slab. A slab basement is the simplest building foundation. It is appealing to solve a basement moisture problem with a. Structural design for residential construction cynthia chabot, p. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. This wall would then be designed as a simply supported member spanning between the first floor and the basement floor slab.

Tm 580912 concrete floor slabs on grade subjected to. This manual prescribes the criteria for the design of concrete floor slabs on grade in buildings for heavy loads and is applicable to all elements. While the basement floor slab is commonly placed directly on the ground, this is by no means the best practice for space that is intended to be livable. One of the first things we looked at was the basementfloor assembly, which in most passive houses is a heavily insulated, concreteslab system. Lowering of a basement floor usually means that the foundations of the house need to be underpinned. What is the best way to install floating laminate flooring over basement slab.

Around the outside of the slab, the concrete forms a 2 to 3foot deep beam that supports the rest of the house being built above. Flat plate concrete floor system does not use beams between columns or. The construction and design of concrete slabs on grade d. Install at least 4 of uniform sized, washed stone underneath the slab floor. Concrete slab moisture can cause problems with the adhesion of floorcovering material, such as tile, sheet flooring, or carpet and bondrelated failures of nonbreathable floor coatings. By underpinning a house, the foundation walls and footings are extended down to a lower level so that the basement floor can be safely excavated in order to gain extra headroom.

In most cases, the slab thickness is designed as an unreinforced concrete section. Reinforcing is added to control shrinkage cracking and maximize the distance between designed joints. These penetrations are any openings in floor slabs that provide an avenue of breech for moisture entry into the building. Flat slab analysis, design and detailing pdf flat slab system is an important division of concrete floor system. Twoway flat plate concrete floor system analysis and design the concrete floor slab system shown below is for an intermediate floor to be designed considering partition weight 20 psf, and unfactored live load 40 psf. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabsonground. Thickened slab areas and the floor slab can be poured in one operation. This appendix presents design examples of the retrofitting techniques for elevation, dry floodproofing, wet. Flat slab analysis, design and detailing pdf civil. Its important to consider not just the walls construction, but also the drainage provided and the way the wall is tied to the houses floor frame.