CBS Tower New York 1961650

Architect Eero Saarinnen Engineer Paul Weidllnger The 38-story CBS tower Is a stark vertical extrusion of the rectangular floor plan. Columns forming a framed tube are expressed as triangular extrusions on the upper floors and diamond shaped on the ground floor. The triangular columns Include niches for mechanical ducts and pipes. The niches decrease from top to bottom with the decreasing duct sizes that run down from the mechanical room on the top floor. The decreasing niches result In...

Fuji Pavilion Expo 70 Osaka 1970

Architect Yutaka Murata Engineer Mamoru Kawaguchi The Fuji Pavilion housed an exhibit and light show of the Fuji corporation in a unique, organic form. Over a circular floor plan of 164 feet (50 meter) diameter, the pavilion featured a vaulted fabric structure composed of 16 pneumatic arched tubes. The tubes of 13 feet (4 meter) diameter were tied together by horizontal belts at 13 feet (4 meter) intervals. The tubes consisted of two vinyl fabric layers that were glued together for improved...

Wind pressure

Windward Leeward Flat Roof

ASCE 7 provides three methods to define wind pressure Method 1 - Simplified Design (limited to mean roof height h 60 ft 18 m ) Method 2 - Analytical Procedure (briefly described below) The Analytical Procedure includes figures and tables for wind speed, exposure, building form, roof slope, enclosure, dynamic behavior and topography. q velocity pressure G gust factor 0.85 1.5 to 2.0 Pressure coefficient 0.8 -0.7 - 0.2 to - 0.5 -1.3 to+0.4 -0.3 to-0.7 CP Cp Cp Cp Cp Cp GCp GCpi q 0.613 I Kz...

Recreation center UC Davis California

Architect Perkins & Will Engineer Leon A. Riesemberg The recreation center for the University of California at Davis holds 10,000 spectators for occasional events. Considering the low-rise context around the facility, a major design objective was to minimize the height. This was achieved by several means. The main level is 10 ft (2.7m) below grade. Landscaped earth berms, filled from the excavated soil, surround the facility to reduce its visual height. Along the building edge the roof deck...

System Selection

Autovideur Bateau

Structural design starts with the selection of a system and material often informed by similar past projects, even if not appropriate. For example, light wood structures are common for residential building where hurricanes cause frequent destruction, though heavy concrete or masonry would resist wind load much better. A rational method is proposed with the objective to select more appropriate systems. However, since design criteria may be conflicting in some cases, selection is both art and...

Recycling hall Vienna 1981

Lang Engineer Natterer and Diettrich This recycling center features a tent-like wood structure of 560 feet (170m) diameter that soars to a height of 220 feet (67m) above ground, supported by a central concrete mast. The suspended wood roof consists of 48 radial laminated ribs that rise from outer concrete pylons with wood compression ring to the mast top. The ribs follow the funicular tension line to carry uniform roof load in pure tension, but asymmetrical loads may cause...

Concealed post cap

Concealed Beam

Concealed connections of post to beam and post to base are available, but they require greater care for proper installation and are more expensive. The alignment of bolt holes in connector and wood is essential and requires skill and experience on part of the carpenter. 1 Split ring with bolt, for twin beams, conceals all but the bolt 2 Concealed T-connector with dowels 3 Concealed L-connector with dowels 4 Concealed post base with dowels Beams need firm support attachment to prevent slippage...

Vierendeel Beam

Vierendeel Concrete Wall

Vierendeel girders resist load in combed beam action and frame action as shown on the left and right diagrams, respectively. Load causes global shear and bending which elongates the bottom in tension and shortens the top in compression. The internal reaction to global shear and bending is different in a Vierendeel compared to a beam. A beam's bending stress varies gradually over the cross-section, but global bending in a Vierendeel causes concentrated tension and compression forces in the...

Fv V Av

V shear force at section investigated Av shear area, defined as web thickness times beam depth Since this is not a rectangular beam, shear stress must be computed by the general shear formula. The maximum shear stress at the neutral axis as well as shear stress at the intersection between flange and web shear plane As will be computed. The latter gives the shear stress in the glued connection. To compare shear- and bending stress the latter is also computed. 1 Beam of L 10 ft length, with...