CONNECTION STIFFNESS IMPLEMENTATION PROCEDURE

Transcription

1 CONNECTION STIFFNESS IMPLEMENTATION PROCEDURE FOR Risa 3D USERS 09/29/17 Modeling of Lateral Frames Using SidePlate Connection Technology: The inherent SidePlate connection stiffness can be implemented within ETABS or SAP by replacing the beam and column stiffness with the SidePlate stiffness. The SidePlate connection provides a 100% rigid panel zone at the column and increases the beam section properties for a distance of approximately the beam depth (Db) beyond the face of the column. Refer to the SidePlate Tech Tips document for a description of the different SidePlate connection types and general design guidelines. USING NON-PRISMATIC BEAM SECTIONS is the most accurate way of implementing the SidePlate connection properties in RISA 3D. The stiffened SidePlate section extends from column face to Dim A (shown in Figure 1). This stiffened SidePlate section, which consists of the physical side plates {A}, cover plates {B} and beam, has an approximate moment of inertia (3) times that of the beam alone for SMF, IMF and OMF applications and (1) times the moment of inertia of the beam for R=3 applications. C Col L Stiffened Region 100% RIGID Panel Zone Dim A Column/Beam Separation Dim B Db Column Side plate {A} Beam ELEVATION Figure 1 - SidePlate Bolted connection elevation Figure 2 - SidePlate Bolted connection section

2 STEP 1: Create General Material Properties of RIGID LINK. (See Figure 3) STEP 2: Create General Section Sets of RIGID LINK. (See Figure 4) Figure 3 - General Material Properties Figure 4 - General Section Properties STEP 3: DETERMINE THE LENGTH OF RIGID LINK RIGID LINK length at beam end is determined by half of column depth RIGID LINK length at column end is determined by beam depth + 3" RIGID LINK LENGTH = 7" FOR A W14X90 IN THIS EXAMPLE RIGID LINK LENGTH = 33" FOR A W30X90 IN THIS EXAMPLE Figure 5 - Rigid Link STEP 4: SPLIT BEAM AND COLUMN MEMBERS On the top of Risa menu, go "Modify -> Split Members..." Input the RIGID LINK length in % or ft, select "Actually Split PHYSICAL Members" and "Apply Entire to All Selected Members", split all beams/columns with the same length and the same RIGID LINK length at once. Figure 6 - Split Members Pg 2 of 6

3 STEP 5: ASSIGN FIXITY OF RIGID LINK Both ends (I End and J End) of RIGID LINK shall be assigned as "Fully Fixed (No Release)". Figure 7 - Rigid Link Fixity STEP 6: CREATE NON-PRISMATIC SECTIONS FOR R=8 PROJECTS In R=8 projects, to create Non-Prismatic beam sections at each end of the moment frame beam is to split both ends of moment frame beams as STEP 4 with the length of SidePlate dimension A. Then assign Non-Prismatic Section Properties to the split members. See Appendix for examples. Both ends (I End and J End) of Non-Prismatic Section shall be assigned as "Fully Fixed (No Release)". Figure 8 - Non-Prismatic Properties To obtain the SidePlate Non-Prismatic Section Design Properties and SidePlate Dimensions, please contact solutions@sideplate.com for more information. STEP 7: CONNECTION WEIGHT To obtain the approximate connection plate weight for a specific project, simply your Risa 3D model to solutions@sideplate.com. One of our engineers will review the model for validation and reply with the connection plate weight. Pg 3 of 6

4 Appendix Examples of Modeling SidePlate Non-Prismatic Beam in Risa 3D: Create and assign Non-Prismatic SidePlate Beam Properties: Modify on the top menu bar, click on Shape Database, when Shape Selection window pop-up, click on Add. In Add Shape window, input NPSP property values, and click ok. Then RE-OPEN Shape Selection window, select the custom shape just created and click Edit. Pg 4 of 6

5 In Edit Shape window, match NPSP properties with SidePlate Non-Prismatic Design Properties. For properties not included in SidePlate Non-Prismatic Design Properties, please refer to AISC Steel Manual. Examples: Pg 5 of 6

6 Assign NPSP beam properties to Risa model: Double click on NPSP member, in Information for Member XXX window, click on Properties TAB, click on Shape List, in Shape Selection window, select the proper custom shape just created, then click OK and OK. Pg 6 of 6