February 1, 2017

Diaphragm Behavior of Deconstructable Composite Floor Systems

By: Mark Webster, Lizhong Wang, Jerome F. Hajjar
This study investigates the seismic behavior of deconstructable composite steel/concrete floor systems consisting of precast concrete planks and deconstructable clamping connections attaching the planks to the steel floor beams.
January 23, 2017

Experimental Study of Deformable Connection Consisting of Buckling-Restrained Brace and Rubber Bearings to Connect Floor System to Lateral Force Resisting System

By: Georgios Tsampras, Richard Sause, Robert B. Fleischman, Jose I. Restrepo

This paper presents experimental and numerical studies of a full-scale deformable connection used to connect the floor system of the flexible gravity load resisting system to the stiff lateral force resisting system (LFRS) of an earthquake-...

January 19, 2017

Low-Cycle Fatigue Performance of High-Strength Steel Reinforcing Bars

By: Chase Slavin, Wassim M. Ghannoum

New high-strength reinforcing steel bars (HSRB) are under development in the United States, driven by constructibility and economic and environmental incentives. An experimental study was undertaken to compare the low-cycle fatigue behavior of...

January 18, 2017

Mooring Line Systems for Tanker Vessels – Current Standards in Analysis and Design Compared to Real Life Data

Design and analysis of moorings of tanker vessels have traditionally been approached from two sides: from the vessel side, regulated by classification societies and with proposed guidelines from OCIMF, and from the land side, regulated by local codes and standards.
December 14, 2016

Smoke Control: Getting it Right

The December 2016 issue of Construction Specifier features “Smoke Control: Getting it Right,” an article by Brian Kuhn. In the article, Brian explores the design and implementation of smoke control systems and the importance of...

December 14, 2016

Parametric Study on Effects of Pile Orientation in Integral Abutment Bridges

By: Brooke Quinn, Scott A. Civjan

For integral abutment bridge (IAB) design, there is no consensus on the preferable orientation of the piles supporting the abutment, although variations can affect overall bridge behavior and forces in the piles. This paper details a parametric...

December 12, 2016

Development and Evaluation of Seismic Retrofit Alternatives for Older Concentrically Braced Frames

By: Molly Johnson, Andrew D. Sen, Marsha A. Swatosh, Ryan Ballard, Daniel Sloat, Charles W. Roeder, Dawn E. Lehman, Jeffrey W. Berman
Concentrically braced frames (CBFs) have been used for seismic-lateral-force resisting systems for many years, but prior to approximately 1988, they were not designed to promote ductile response using capacity-based design.
December 12, 2016

Evolution of ACI 562 Code – Part 10

By: Gustavo Tumialan, Nestore Galati, Antonio Nanni

The December 2016 issue of Concrete International magazine includes an article co-authored by Gustavo Tumialan with Nestore Galati of Structural Technologies and Antonio Nanni of the University of Miami. The article, “...

November 23, 2016

A Collaborative Approach to Restoring MIT Main Group and Building 10 Dome

By: Emily Hopps, Carl Jay, Shawmut Design and Construction, Benjamin Markham, Acentech Inc., Gary Tondorf-Dick, Massachusetts Institute of Technology

Since 1916, the Great Dome has been the symbol of the MIT campus. In 1942, MIT covered the oculus skylight in the Dome, resulting in the Barker Library Reading Room being solely lit by electric lights and an overall dim lighting level. MIT...