TWA Hangars of Thin Shell Design
TWA hangars at the Kansas City International Airport match the shape of the giant jets. The design molds hyperbolic paraboloid concrete shells into an efficient shop area. Since the design...

Direct Design of Taut Cables under Uniform Loading
The behavior of tightly strung cables under uniformly distributed loading is considered. It is found that the relevant literature is not very extensive in view of the previous lack of...

Computer Design of Antenna Reflectors
Performance of a paraboloidal antenna reflectors is adversely influenced by surface distortions from a perfect paraboloid, which causes path length variations of the RF energy beam. The...

Large Deflection of Shallow Paraboloid Shells
Based on the well-known Marguerre's theory of shallow shells, a study is made of large deflection of rectangular paraboloid shells caused by transverse loads. Using the Ritz...

Buckling of Orthotropic Hyperbolic Paraboloid Shells
The note examines the classic paper by Reissner on buckling of isotropic hyperbolic paraboloid shells....

Lowest Natural Frequency of Clamped Parabolic Arcs
An analysis is made of finding the lowest natural frequency of a clamped parabolic arc with a variable section including the effect of the cross section and constant section....

Flow over Rounded Spillways
Beginning with a condition necessary for irrotational flow, a reasonably simple solution has been obtained for the flow over round-crested spillways. Additional assumptions were that the...

Finite Difference Approach to Hyperbolic Paraboloids
A square, shallow, elastic hyperbolic paraboloid shell is considered. Local failures of shell membrane and flexible edge beam in a ruled surface due to bending and twisting effects are...

Lateral-Torsion Buckling of Parabolic Arches
Equations were derived which govern the lateral-torsional buckling of parabolic arches. Buckling loads were obtained for a uniform applied loading. Both free-standing and crown restrained...

Analysis of Hipped Roof Hyperbolic Paraboloid Structures
The results of a finite element analysis of a hipped roof hyperbolic paraboloid shell are presented. The results emphasize the stresses in the supporting and the ridge beams. Significant...

Experimental Investigation of Thin-Steel Hyperbolic Paraboloid Structures
Extensive tests on inverted umbrella and saddle-shaped models indicate that the design of thin-steel hypar roofs is usually governed by stiffness, rather than by stress limitations. The...

Analysis of Thin-Steel Hyperbolic Paraboloid Shells
Finite element analyses of orthotropic hypar structures, using flat and curved elements, are compared with experimental results. The flat element approach tends to predict the deflections...

Dynamics of Impulsively Loaded Circular Plates
A theoretical investigation is done on a loosely clamped, rigid-plastic plate subjected to a parabolically distributed impulse load. It is assumed that the plate is spherical at any instant...

Effect of Channel Shape on Gradually Varied Flow Profiles
An analysis of gradually varied flow profiles with Froude number as a reference parameter is made. Generalized nondimensional varied flow profiles of the M and S types are computed for...

Finite Element Analysis of Hyperbolic Paraboloid Shells
Orthotropic triangular finite elements with double curvature have been used in analyzing the multi-wing hyperbolic paraboloid shell roof of the American Airline aircraft hangar, San Francisco,...

Experimental Study of Lateral Buckling of Arches
An experimental investigation was conducted to obtain lateral buckling loads of parabolic and circular arches subject to either uniform vertical or uniform tilt loading, or both. Free...

Lateral Buckling of Parabolic Arches
Lateral buckling loads are presented for parabolic arches loaded uniformly by means of either hangers or columns. Buckling loads for arches with hangers have been previously obtained by...

Limit Slope in Uniform Flow Computations
A method to prepare design charts for uniform flow in open channels is presented by introducing the concept of limit slope which is the smallest critical slope for a given channel shape...

Linear Proportional Weirs
The profile equation of the weir with a parabolic bottom is analytically obtained for the condition of the discharge varying linearly with the head. The conditions of the discharge and...

Analysis of Arching Pressures in Ideal Elastic Soil
For the purpose of analysis of arching above a flexible structure the soil is considered a suitably-bounded rectangular prism with a strip of the bottom plane representing the structure...

 

 

 

 

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