Practice Periodical on Structural Design and Construction

Alternate Path Method in Progressive Collapse Analysis: Variation of Dynamic and Nonlinear Load Increase Factors

Aldo McKay, Kirk Marchand, and Manuel Diaz
In performing alternative path analyses for checking the potential of a structure to progressive collapse most designers often choose static procedures which tend to be simpler and less labor demanding. As progressive collapse is a dynamic and nonlinear event, the load cases for the static procedure ... [Practice Periodical on Structural Design and Construction doi:10.1061/(ASCE)SC.1943-5576.0000126] posted Sat Jan 28, 2012.

R.C. Columns Strengthened with Steel Angles and Battens: Experimental Results and Design Procedure

Giuseppe Campione
In this paper, an analytical model is presented for the design of an axially loaded strengthened reinforced concrete (R.C.) columns with steel angles and battens. Cases of directed and not directed steel angles were considered. The model considers the contribution in confinement pressures due to tra ... [Practice Periodical on Structural Design and Construction doi:10.1061/(ASCE)SC.1943-5576.0000125] posted Mon Dec 19, 2011.

Three-Dimensional Modeling and Analyses of Orthotropic Bridge Decks Using Representative Volume Element

Upul Attanayake, Zekai Akbay, and Haluk Aktan
A representative volume element (RVE)based modeling procedure, macromechanical modeling, is presented for the homogenization of orthotropic bridge superstructures. The purpose of the models is the simplification of the complex deck structures for three-dimensional (3D) load-response analyses. A nume ... [Pract. Period. Struct. Des. Constr. doi:10.1061/(ASCE)SC.1943-5576.0000096] published Fri Dec 16, 2011.

Erratum for Development Formulation for Structural Design of Concrete Box Culverts by Alia Osman Mohamed Ahmed and ElHussein Alarabi

Alia Osman Mohamed Ahmed and ElHussein Alarabi
Abstract not available. [Pract. Period. Struct. Des. Constr. doi:10.1061/(ASCE)SC.1943-5576.0000105] published Fri Dec 16, 2011.

Settlement Rehabilitation of a 35-Year-Old Building: Case Study Integrated with Analysis and Implementation

Yail J. Kim, Sivapalan Gajan, and Mohamed Saafi
This paper presents a rehabilitation project concerning the settlement of a 35-year-old building. The foundation system of the northwest wing of the building consists of strip footings and slab on grade. Differential settlement results in significant cracking of the masonry partition walls located o ... [Pract. Period. Struct. Des. Constr. doi:10.1061/(ASCE)SC.1943-5576.0000092] published Fri Dec 16, 2011.

Reviewers

Abstract not available. [Pract. Period. Struct. Des. Constr. doi:10.1061/(ASCE)SC.1943-5576.0000112] published Fri Dec 16, 2011.

Erratum for Structural Analysis and Fatigue Reliability Assessment of the Paderno Bridge by A. Pipinato and C. Modena

A. Pipinato and C. Modena
Abstract not available. [Pract. Period. Struct. Des. Constr. doi:10.1061/(ASCE)SC.1943-5576.0000107] published Fri Dec 16, 2011.

Editor's Note

Jamshid Mohammadi
Abstract not available. [Pract. Period. Struct. Des. Constr. doi:10.1061/(ASCE)SC.1943-5576.0000111] published Fri Dec 16, 2011.

Sustainable Structural Design Methodologies

Joseph M. Danatzko and Halil Sezen
Modern society is demanding that the use of energy associated with construction and operation of structures be investigated during the planning and design phases. The engineering community has been striving to design more sustainable buildings in an attempt to reduce both raw material requirements a ... [Pract. Period. Struct. Des. Constr. doi:10.1061/(ASCE)SC.1943-5576.0000095] published Fri Dec 16, 2011.

Limiting Effects of Construction Vibrations on Sensitive Equipment

Eric E. Ungar and Jeffrey A. Zapfe
Approaches are discussed for addressing concerns regarding the effects of construction-related vibrations on sensitive instrumentation and activities. The availability of related vibration criteria is noted, the limitations of available criteria are explored, and difficulties in meeting some of the ... [Pract. Period. Struct. Des. Constr. doi:10.1061/(ASCE)SC.1943-5576.0000090] published Fri Dec 16, 2011.

Method to Compute Live-Load Distribution in Bridge Girders

Jingjuan Li and Genmiao Chen
Live-load distribution is an important step in the analysis of bridge superstructures. This paper introduces a new framework to compute live-load distribution for bridge girders. The model uses elastic spring elements to simulate the reaction of main girders to the deck system. The cross-section fra ... [Pract. Period. Struct. Des. Constr. doi:10.1061/(ASCE)SC.1943-5576.0000091] published Fri Dec 16, 2011.

Sustainability and the Structural Engineer

Geoff Weisenberger
Abstract not available. [Pract. Period. Struct. Des. Constr. doi:10.1061/(ASCE)SC.1943-5576.0000110] published Fri Dec 16, 2011.

American Swing Bridges 1797 to 1907

Francis E. Griggs, Jr.
Movable bridges were built for centuries with wood, iron, and steel. The earliest drawbridges of short span were followed by swing bridges. In the United States, swing bridges were originally built across canals such as the Erie and the Chesapeake and Ohio (C & O) with wood and iron. Starting around ... [Pract. Period. Struct. Des. Constr. doi:10.1061/(ASCE)SC.1943-5576.0000072] published Fri Dec 16, 2011.

Nineteenth-Century Metal Arch Bridges

Francis E. Griggs, Jr.
While many arches were built with wood in the early nineteenth century, the availability of cast and wrought iron and later steel led to a proliferation of metal arch bridges after the Civil War. Cast iron was used in 1839 with the Richard Delafield's Dunlap's Creek Bridge, 80 ft span, and the 1858 ... [Pract. Period. Struct. Des. Constr. doi:10.1061/(ASCE)SC.1943-5576.0000082] published Fri Dec 16, 2011.

Trenchless Infrastructure Construction Techniques Used in Colombia

John C. Matthews and Juan Carlos Gutierrez
The use of traditional urban infrastructure construction techniques, particularly open-cut construction, is being used less and less due to the benefits offered by trenchless techniques. These techniques typically reduce the disruption and impact on both the environment (i.e., reduced green house ga ... [Practice Periodical on Structural Design and Construction doi:10.1061/(ASCE)SC.1943-5576.0000123] posted Tue Nov 15, 2011.

Verification of the Strength of the Anchor Point of a Fall Arresting and Positioning Systems for Reinforcing Steel Erectors

Andre Lan and Renaud Daigle
For walls of great dimensions, fall protection is problematic. The reinforcing steel erector has to climb on the reinforcement bars to anchor and position himself to do his tasks and to protect himself against falls. Two problems are identified: 1) the selection of a harness, positioning and fall ar ... [Practice Periodical on Structural Design and Construction doi:10.1061/(ASCE)SC.1943-5576.0000122] posted Tue Nov 15, 2011.

Impact of Crew Scheduling on Project Performance

Awad S. Hanna, Aviad Shapira, Mounir El Asmar, and Craig S. Taylor
Contractors have responded to the growing pressure of owners to shorten project duration by employing a variety of crew scheduling techniques. Unfortunately, only a limited knowledge base exists for determining the impact of different crew schedules on project performance in terms of cost, duration, ... [Practice Periodical on Structural Design and Construction doi:10.1061/(ASCE)SC.1943-5576.0000121] posted Sun Nov 13, 2011.

Configuration Optimization of Drilled Shafts Supporting Bridge Structures: Three Case Studies

Brent Robinson, Vinicio Suarez, Mohammed Gabr, and Mervyn Kowalsky
A common approach to estimate the point of fixity is to utilize the results of a single pile lateral analysis. Although no universal agreement exists as to the definition of the location of the point of fixity, it is generally accepted that its location will impact the computed stresses and displace ... [Practice Periodical on Structural Design and Construction doi:10.1061/(ASCE)SC.1943-5576.0000118] posted Wed Sep 14, 2011.

Seismic Retrofitting for Chord Reinforcement for Unreinforced Masonry Historic Buildings with Flexible Diaphragms

J. Kent Hsiao and Jale Tezcan
The existing wood-diaphragm-to-masonry-wall connections in unreinforced masonry (URM) buildings provided very little or insufficient resistance in past earthquakes. Recent strengthening techniques for the connections between the URM walls and the flexible diaphragms concentrate only on the installat ... [Practice Periodical on Structural Design and Construction doi:10.1061/(ASCE)SC.1943-5576.0000117] posted Fri Sep 9, 2011.

Prediction of Inelastic Mechanisms Leading to Seismic Failure of Interior Reinforced Concrete Beam-Column Connections

Nilanjan Mitra and Pijush Samui
Inelastic mechanisms leading to failure in interior reinforced concrete beam column (RCBC) connections, designed based on concept of strong column weak beam philosophy, are primarily failure of the joint region and yielding of longitudinal reinforcement in beams. Two novel easy to use probabilistic ... [Practice Periodical on Structural Design and Construction doi:10.1061/(ASCE)SC.1943-5576.0000115] posted Wed Aug 31, 2011.

Accounting for Architectural Demands and Construction Phase in Structural Design

M. Branco, M. R. Arruda, and L. Murteira
The structural design of a three-story building in Palmela, near Lisbon, Portugal, is analyzed. Due to architectural constraints, the main facade of the first floor was designed in a setback of the second floor, which created a 13.0m (42.6 ft) span between supports. To comply with deflection require ... [Practice Periodical on Structural Design and Construction doi:10.1061/(ASCE)SC.1943-5576.0000114] posted Thu Aug 18, 2011.