Shear Wall Design Data

A Design Summary page appears immediately before start of the sections pertaining to each design case for shear wall design results. For more detailed results, for each of the design cases to which they apply, there are tables for the following:

Shear Results Table

For each of flexible diaphragm wind design, rigid diaphragm wind design, flexible diaphragm seismic design, and rigid diaphragm seismic design, the Shear Results table shows

• forces on each shear line, shear wall, shear wall, shear wall segment between openings, and force-transfer pier.
• the allowable shear of both interior and exterior sheathing
• the design ratio of allowable to for each segment, and for the critical segment for walls and shear lines
• the combined interior and exterior shear and the rule used to combine them
• any relevant factors based on the characteristics and geometry of the walls and segments

Component and Cladding Table

If wind C&C loads are present, the Component and Cladding Table shows design for out-of-plane sheathing strength and nail withdrawal. There is only one such table, applying to both rigid and flexible diaphragm wind load cases.

The table reports C&C design loads and sheathing and nail capacities for the end zone and interior zone for each shear wall, by shear line.

The end zone C&C load is used to determine the sheathing thickness and stud spacing. The withdrawal capacity of a nail is used to determine size and spacing of nails for end and interior zones.

There may be as many as three entries in this table for each shear line and building level. These entries correspond to separate wall groups - one for non-shear walls along the shear line, one for shear walls designed using the rigid analysis, and one for shear walls designed using the flexible analysis. In practice, there will usually be only one wall group per shear line and building level.

Seismic Information

For seismic design, the program outputs a table giving the following information on each level of the structure

• total building mass on level
• total story shear force
• the floor surface area of the level
• the diaphragm force F_px from ASCE 7 12.10.1.1
• the total diaphragm design force including the effect of discontinuous shear lines factored by overstrength factor Ω0

Underneath the Seismic Information table, there are small sections showing information regarding

• the Redundancy factor r from ASCE 7 12.3.4
• the vertical earthquake load Ev from ASCE 7 12.4.2.2
• Restrictions based on building height, materials used, and Seismic Design Category
• Restrictions based on building irregularities and Seismic Design Category

Other Tables

For each design case, there are also tables showing

• Shear Wall Deflection
• Hold-down Displacement
• Story Drift
• Hold-down Design
• Collector Forces (drag struts and force-transfer straps/blocking).

Refer to the topics describing these aspects of the program for descriptions of the output.

Warnings

Warnings appear beneath the tables in red if any shear lines, walls or hold-downs fail, that is, the applied force exceeds the design capacities of these elements, or there is excessive story drift. Warnings also appear if the building contravenes other design code limitations, such as materials allowed for seismic design categories.