# 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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