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If Yes then boundary elements/zones are required. If No it means there are no boundary elements/zones required. If the load combination that controlled the design used the overstrength seismic forces (meaning it had an Ω factor in the load combination) then the governing load combination will be followed by an asterisk (*).
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Risa 3d simple beam walkthrough code#
There is one main shear code check for either piers (per Section 18.7.6.1.1) or coupling beams (per equation 18.10.7.4). This column states the specific region and the associated pier or lintel. This column determines whether the output is for a coupling beam or a wall pier.
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This design consideration is applicable to Intermediate Precast and Special shear wall types. Pier design is governed by section 18.10.8. Ωv is calculated per Equation (18.10.3.1.3), the number of story above the critical section ns is user-input parameter in Global Model Setting-Seismic Tab: For the wall panel/region at critical section, Mpr and Mu values are reported in the Region result of the Detail Report. The governing combination of Mpr/Mu will be used to calculate Ωv factor. Mpr is the moment capacity calculated assume steel yield stress is 1.25*fy. In the table, the hwcs refers to the height of the entire structural wall, and lw is the width of a wall panel/region. RISA assumes the lowermost wall panel/region base to be the critical section. Note that the combined amplification factors shall not exceed 3.0 per Equation (18.10.3.1). These amplification factors are used to calculate the seismic design force Ve. The governing Ωv and ωv values are provided in the wall panel/region Detail Report. RISA calculates the amplification factors Ωv and ωv automatically based on the code provisions. Shear Force Amplification in ACI 318-19ĪCI 318-19 Section 18.10.3.1 requires the special concrete wall to consider the design shear force amplification per Equation (18.10.3.1). This option has provisions specific to section 18.10. This Wall Type assumes Seismic Design category D, E or F. This option has provisions specific to wall piers per section 18.5. The provisions required to be met are elements not considered in the RISA-3D analysis/design. This option adds no extra checks to the wall on top of the regular code checks for a non-seismic consideration per section 18.2.1.6(b). These are the three wall types supported in RISA-3D. The label is the name for the Wall Seismic Design Rule that is called out for a wall panel. ACI 318-19 and ACI 318-14 are the supported codes for this feature and all code references given in this topic are specific to these codes.Concrete Wall - Seismic Design Concrete Wall - Seismic DesignĬoncrete walls can now be designed for seismic design provisions.