August 30, 2019

Vibration Analysis for Steel Joists

RISAFloor v14 includes Steel Joist Vibration Analysis per SJI Technical Digest #5. For more information, check out the video below.

Tags: RISAFloor, New, Floor Vibrations, Steel Joists

August 30, 2019 | Loads, Load Combinations, RISAFoundation, New

Nested Load Combinations in RISAFoundation

RISAFoundation includes the ability to utilize “nested” load combinations. Currently, the Load Combinations spreadsheet in RISAFoundation is limited to ten columns of Basic Load Cases (BLCs) and Factor combinations. However, there are times where you may need to include additional entries to your Load Combination. To do this, you can simply “nest” your load combinations. This means that if you need more than eight BLC entries in a single load combination, you can define the common BLCs (such as Self Weight, DL, and/or LL) in one load combination that you can then reference in the other load combinations. Entering “Lnn” in the BLC field will include all the BLCs (and their factors) from the load combination on line “nn” of the spreadsheet, thereby “nesting” the combination. This can also be used to simplify your input. Note: When a Factor is assigned to the “nested” BLC line, it will be applied to all the entries in the nested combination. For example, in the image above, the DL in LC2 has a Factor of 1.2, whereas the “nested” combination (LC2) has a Factor of 1.5. This means that the two Factors will be multiplied together, resulting in an overall factor of 12*15…

October 7, 2017 | RISAFloor ES, Concrete, New

User Defined Reinforcement

RISAFloor ES v12 now includes the ability to manually define user reinforcement in concrete slabs…

August 30, 2019 | Slab, RISAFoundation, New, Reinforcement

Add Single Layer of Reinforcement anywhere in Slab

RISAFoundation has the ability to create a single layer of reinforcement anywhere in a slab. This improvement allows for a more straightforward design of thin, lightly loaded slab-on-grade where two layers of reinforcement (top/bottom) would be unnecessary. In order to add a single layer of reinforcement, users select Single Layer from the Rebar Options drop-down found in the Mat Slab tab of the Design Rules spreadsheet. When a user selects Single Layer, only the inputs for Top Bar size and the Max/Min Top Bar Spacing are used. Additionally, the value of Top Cover found in the General tab is used to define the depth of the bar in the slab. Note: When Mid-Depth Only is selected, the Bottom Bar size, the Max/Min Bot Bar Spacing and the Bot Cover are used. The design of the slab will differ based on whether the reinforcement is placed above or below the mid-depth of the slab. When the single layer is placed above mid-depth, the slab will be designed according to slab-on-grade requirements found in ACI 360-R and ACI 223. These provisions focus mainly on design in response to crack control. When the single layer is placed below mid-depth, the reinforcement is assumed…