The Tunnel Page - The longest road and rail tunnels in the world grouped by categories such as sub-sea tunnels, and immersed tubes. Nova Online: Why the Towers Fell - Investigates the causes of the collapse. Includes interviews with a survivor and an engineer, information on the design of the building. Structural Testing Laboratory - Materials and structural testing at Ruhr-Universität Bochum. Canadian Precast Prestressed Concrete Institute - CPCI is the prime source of technical information about precast prestressed concrete in Canada. Strunet.com - Resource for concrete design aids, for columns and beams, spread footing amalysis, flow charts in PDF, recommended books, contact form for feedback. Design Failure Lessons - Hyatt Regency Hotel Catwalk Collapse - Why it happened and how it could have been avoided. SAC Steel Project - Seeks to develop reliable, practical, and cost-effective guidelines and standards of practice for the identification and inspection of at-risk steel moment frame buildings, the repair or upgrading of damaged buildings, the design of new construction, and the rehabilitation of undamaged buildings. SEsite - Structural engineering software, technical publications, text books, code books, and jobs. Structural Design Spreadsheets - Microsoft excel spreadsheets for foundation, concrete, masonry, and wood design and lateral analysis (wind, seismic, etc.). Free download of demonstration versions with professional versions available for purchase. Engineering Fundamentals - Military manuals related to drafting fundamentals and techniques, drafting projections and sketches, wood and light-frame construction. Radar Resolution In Masonry: Facts and Myths - Thesis discusses the use of radar NDT in the testing the internal masonry structures enabling initial identification of structural problems. Structural Stability - Paper by Zdenek P. Bazan providing an overview of this vast field including elastic and inelastic structures, static and dynamic response, linear and non-linear behavior, energy approach, thermodynamic aspects, creep stability and fracture or damage-induced instability. BridgeArt.net - Provides resources for structural engineers including a database of structural engineering software, structural wiki, industry news monitoring and design spreadsheets. Structurae - International database and gallery of structures of interest to the civil engineer. Eng-Tips: Structural Engineers - Technical support forums and mutual help system. Selling and recruiting forbidden. NRC: Construction - National Research Council's rebranded Institute for Research in Construction (IRC) is Canada's construction technology centre. IRC provides research, building code development, and materials evaluation services. Forms and Structures Generated by Identicals Elements - Research dealing with generation of double curvature forms with a unique modulus: an equilateral triangle.