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The Design Track is tailored to provide in-depth education specifically for those designing and engineering tilt-up projects.

 

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Dazzling Array of Architectural Treatments Using Formliners and Color Stains

September 28, 2019 from 7:00am to 8:00am

M103-105

Dave Ellis

The design and construction industries are starting to take notice of the significant benefits realized when one uses tilt-up concrete with formliners and colored stains. Owners and builders are enjoying savings in cost and time, as prefabricated tilt-up panels with architectural finishes can be supplied considerably faster than traditional alternatives. This session will explain why many architects and designers are preferring the tilt-up methods that use formliners and colored stains. We will discuss the increased flexibility, vivid colors, and the higher level of quality control that can be achieved. High-end building owners, developers, and others are seeing the many benefits of using stains and formliners to enhance the aesthetic appeal of tilt-up concrete.

Designing Floors with Joints

September 28, 2019 from 9:30am to 10:30am

M103-105

Dirk Van Cauteren

When designing floors with joints, load transfer capacities and the reduction of load capacity at joints and at the slabs’ edges are not fully realized and accounted for, not even in the most prominent floor slab industry guides throughout the world. This presentation gives an overview of load transfer at joints and describes actual testing that has been done, bringing us to a fuller understanding of load transfer capacity in various jointing systems.

Structural Integrity Provisions for Tilt-Up Construction

September 28, 2019 from 10:30am to 11:30am

M103-105

Joseph J. Steinbicker, PE, SE, FTCA

It is now widely accepted and codified that tilt-up concrete panel construction is considered site-cast pre-cast. As such, the structural integrity provisions of the American Concrete Institute’s “Building Code Requirements for Structural Concrete” (ACI 318-14) apply. The details required to satisfy the structural integrity provisions for the common one- and two-story tilt-up buildings are, for the most part, well known and in common use. However, with the increasing use of load-bearing tilt-up concrete panels to construct multi-story buildings of three stories or more, additional structural integrity provisions become applicable. This presentation will identify and discuss the code-required structural integrity provisions applicable to multi-story tilt-up, and it will show some typical details that satisfy these requirements.

Practical Applications of Nonlinear Static Analysis to the Seismic Design of Tilt-Up Structures

September 28, 2019 from 11:30am to 12:30pm

M103-105

Timothy Mays, PhD, PE

In this session, Dr. Mays discusses limit design used in tilt-up structures. The economic benefits of limit design (i.e., overall steel reduction and less stringent prescriptive seismic detailing) are coupled with increased structural reliability related to the seismic performance objectives established in the IBC. Put simply, when limit design is used for tilt-up panels, the designer is in control of the design, places reinforcing steel where needed, and is able to fully document how the structure will move, safely and reliably, during the design earthquake.

Performance Linear Elastic Design using Based Modulus of Rupture Testing

September 28, 2019 from 1:30pm to 2:30pm

Luke Pinkerton

While “structural plain concrete” is used throughout the concrete, it could contain components specifically designed to increase the modulus of rupture of the concrete. ACI 322 developed the basic approaches in the 1970s. There has been little work in this area since. There have been significant developments, however, in products that can enhance the properties of plain concrete. These simple linear elastic approaches will be applied to a subset of tilt walls that can sustain ultimate design loads while remaining elastic. While application of this mode of design is limited, it has been proven successful in over 1000 panels incorporating HelixR and provides significant economy over traditional methods. This method was demonstrated at the 2018 TCA Convention in Dallas. In this session we will cover, in detail, the plain structural concrete design, modulus of rupture testing, ASCE-7 performance based design principles behind the 2018 demo. We will invite a discussion at the end about how these principles if adopted on a wide scale would change the business from the perspective of a contractor, engineer, ready mix concrete producer and code official.

Speed, Performance, Economics: The New Approach for Braced Frames in Tilt-Up Construction

September 28, 2019 from 2:30pm to 3:30pm

M103-105

Tom Liu, PE

Bryant Cunningham

Buckling-restrained braces (BRBs) have dramatically altered the landscape of tilt-up warehouse construction by offering significant advantages in cost, speed of erection, and performance. They also eliminate the need for support columns that are often used at the intersection points of traditional braces. Proper implementation of these structural members will save design time for the engineer, reduce fabrication costs, and lead to a more time-efficient construction schedule for the fabricator and contractor. The resulting building will be safer and will have lower costs for the owner, while also providing greater warehouse functionality. This seminar will explore how BRBs function and how they are being implemented to provide smart solutions that result in more economical, more functional, and safer building design.

High-Strength Welded Wire Reinforced Tilt-Up Panels

September 28, 2019 from 3:30pm to 4:30pm

M103-105

Philip Kopf, PE, FTCA

The use of grade 80 welded wire reinforcement in tilt-up panels is becoming the go-to choice for many designers and contractors. During this talk, we will explore the value and benefits of this welded wire reinforcement in the tilt-up market. We will cover the process of converting to this product from loose bar, and we will highlight special design issues that should be considered. This seminar will provide multiple design examples with calculations.