Concrete Screw Anchors as Retrofit Anchor Bolts

Uncategorized
0
This post examines using Concrete Screw Anchors (such as the Simpson Titen HD concrete screw) as a replacement for cast in place anchor bolts in retrofit situations. The IBC includes special provisions for cast in place anchor bolts with at least 7 inches of embedment (among other criteria). See 2021…

Retaining Wall Design

Structural Engineering
Retaining wall design is a highly inexact science that relies on many assumptions and specifications. Some parts of the process are codified, but many of the decisions to be made are based on engineering judgment, informed by past studies, geotechnical references, and sources outside of the building codes (for example,…

Shear Capacities for Wood-Framed Diaphragms

Structural Engineering
Based on SDPWS 2015 (Table 4.2). All specifications based on min. 19/32 floor sheathing, 12″ field nailing. All SDPWS shear values multiplied by 0.5 * (1 – (0.5 – 0.42)) to convert to ASD and adjust for SPF framing. Unblocked shear values show All other Cases / Case 1, in…

Retrofit Straps to Concrete

Structural Engineering
One of the easiest way to tie down shear walls to an existing concrete foundation is with the use of steel straps fastened to the face of a concrete stem wall with concrete screw anchors. Typically we use Simpson’s MST straps for this purpose. Other potential straps include the MSTCM…

Site Plan

Drafting Standards, Production Tutorial
PROPERTIES Associated Level: Main Floor (T.O. Sheathing)Orientation: True NorthView Scale: As large as will fit on a sheet (up to ¼” = 1’-0”) Cut Plane: High enough to not cut toposurface, Bottom and view depth = unlimited, top= unlimitedCreate a Plan Region encompassing the building and set cut plane to…

Roof Plan

Drafting Standards
Properties Associated Level: Main Floor or Upper Floor (T.O. Plate)Top: Associated 15’0″ (or above peak of roof)Cut Plane associated Offset 10′ (or above peak of roof, not cutting anything)Bottom: (Level Below: 0’0”)View Depth Level: (Level Below 0’0”)Visual Style: hidden linePhase Filter: Show New Lables/ Notes Existing Roof to remainNew roof…

Foundation Plan

Drafting Standards
Properties View Range: Associated Level: Foundation (T.O. Footings) looking downTop: Main Floor T.O. SheathingBottom: Below FootingsCut Plane: cut through foundation walls looking down at footings, set cut plane to cut through foundation ventsPhase Filter: Show New Labels/ Notes Existing foundation wallsExisting footingsNew foundation walls with size and reinforcementNew footings with…

Floor Framing Plans

Drafting Standards
Properties View Rangeassociated Level: Base of Footings looking UP for Main floor, T.O. Sheathing main floor for Upper floorCut Plane: Cut through foundation walls looking up, set view limits high enough to see walls above Lables/ Notes Floor sheathing thickness and nailing pattern Note any joist rollout obstacles to avoid…

Wall Framing Plans

Drafting Standards
Properties View Range Associated level: (Main floor T.O. Sheathing)Cut plane: Cut through walls to show all openings, looking DOWNVisual Style: hidden line Labels/ Notes Trimmer studs/ hold-down postsStraps/ hold-downsWall heightsExtents of work Dimensions All opening dimensions this sheet are rough openings OverallsGridlinesMajor jogs in buildingcenterline of openingscenterline of free-standing postsinterior…

LFRS Process

Calculation Templates, Drafting Standards, Structural Calculators, Structural Engineering, Structural General
General Set-up Copy/resave lateral calculator spreadsheet, and Structural calcs intro from most recent completed project in structural folder.Look up ATC Seismic hazards by location (ASCE7-16, Risk category II, Site Class D-default). Print results to structural folderCreate LFRS Structural Plan Views  Create new structural plan view labeled “LFRS Diagram – Existing…