Vierendeel Frame Analysis: Slope-Shear Equations
The concept of slope-sher equations has been presented and found useful in the analysis of Vierendeel structures subjected to antisymmetric loads. Coupled with the direct rotation contribution...

Constraints for Axial Strains in Frames
In the stiffness method of analysis, as applied to plane and space frames, axial strains in members may be systematically omitted using constraint conditions that prohibit length changes....

Natural Frequency of Timoshenko Beam on Flexible Base
The influence of base rotational and horizontal springs has been investigated for Euler and Timoshenko beams. The results were presented in terms of convenient dimensionless parameters...

Prebuckling Rotations and Cylinder Buckling Analysis
The quantitative importance of prebuckling-rotation terms in the stability equations for structural shells is examined for cylindrical shells subjected to axisymmetric lateral pressure....

Principal Stress Rotation: A Missing Parameter
Changes in the directions of principal stresses occur in all ground work associated with engineering works, as well as earthquakes; an important topical example is the cyclic loading from...

Assessment of Empirical Concrete Impact Formulas
Data from 145 recent impact tests of reinforced concrete walls with solid and pipe missiles are used to assess the accuracy of several empirical formulas. For solid missiles, penetration...

Zero-Extension Line Theory of Dynamic Passive Pressure
A theory for dynamic passive pressure for sand is developed. The theory is based on a simplified zero extension line field. Equations and charts for computing the dynamic coefficient of...

Static Response of Reduced Rotation Rope
A theory has been developed to predict the static response of a wire rope consisting of a left lay inner rope and a right lay outer rope. A nonrotating rope, under axial load, can be produced...

Dense Bottom Currents in Rotating Ocean
The dynamic equations for a steady dense bottom current on a gently sloping plane in a rotating ocean are outlined. The entrainment and the friction at the wall and the interface respectively...

Turbulence in Helically Corrugated Pipe Flow
Results are reported of experimental measurements of friction factor, mean and turbulent velocities, and Reynolds stresses in fully developed flow through a helically corrugated pipe....

Space Shuttle
In modifying the decade-old Apollo man-to-the-moon launch facilities at Cape Kennedy, FL, for the forthcoming Space Shuttle mission NASA and contractors made two major innovations: To...

Response of Structure Permitting Lift-Off to Rotational Input Motion from Horizontally Propagating Waves

Hybrid Element Applied to Shear Wall Analysis
In the finite element analysis of structures consisting of assemblages of beam and plate elements such as coupled shear walls, difficulties are encountered at the point of intersection...

Flexural Rotational Capacity of Spandrel Beams
This paper presents an investigation designed to study the effect of the presence of torsion of the flexural rotational capacity of spandrel beams. Test results from fourteen identical...

Lay Effect of Wire Rope
A theory has been developed to predict the static response of wire rope consisting of strands in which the wires in the strand are wound in different directions. In the right lay-regular...

Torsional Stiffening of I-Girder Webs
The torsional response of box stiffened I-sections has been predicted by two analytical procedures. These methods utilize basic torsion theory and compatibility relationships. One method...

Extreme-Value Problems of Limiting Equilibrium
A unified formulation of extreme-value problems in soil mechanics is presented. The unified problem includes among others the conventional slope stability, bearing capacity, and limiting...

Group Factors for Pile-Deflection Estimation
A series of solutions is presented for group settlement, lateral deflection and rotation ratios, for a variety of pile-group configurations, spacings, and stiffnesses and for both a homogeneous...

Largest Rotating Biological Contactor Plant Also First to Remove Nitrogen
Orlando, Florida is now constructing a new advanced waste treatment plant that removes both nitrogen and phosphorus to a high level. The plant is notable because it is the largest rotating...

Prebuckling Rotations and Buckling Analysis