Compound Forms from Elements with Hyperbolic Surfaces

1994 ◽  
Vol 9 (2) ◽  
pp. 87-98 ◽  
Author(s):  
Anatoly G. Trushcov ◽  
Gennady P. Ivanov
Keyword(s):  
Vertical Load ◽  
Hyperbolic Surfaces ◽  
Box Beams ◽  
Large Eccentricity ◽  
Folded Structures ◽  
Hyperbolic Paraboloids

Interesting results obtained while forming structures with the use of single-petalous hyperbolic paraboloids are presented in this paper. Two main methods of forming compound shells are discussed. Formation possibilities are illustrated by examples, such as box beams and columns with walls made of hypars, bunkers and vertical silos, support elements in foundation that work under vertical load with large eccentricity, folded structures, vaulted and domed radial shells that have various plan views. The structures, mentioned above, are made of hypars with straight edges.

scholarly journals Numerical Investigation of the Behavior of Strip Footings under Large Eccentric Loads

2019 ◽  
Vol 27 (3) ◽  
pp. 29-36
Author(s):  
Sadok Benmebarek ◽  
Ahlem Guetari ◽  
Mohamed Saddek Remadna ◽  
Naima Benmebarek
Keyword(s):  
Bearing Capacity ◽  
Sandy Soil ◽  
Close Agreement ◽  
Reduction Factor ◽  
Vertical Load ◽  
Large Eccentricity ◽  
Strip Footings ◽  
New Formula ◽  
Central Load ◽  
Load Conditions

Abstract In this paper, numerical computations using the FLAC code are carried out to investigate of the behavior the bearing capacity of strip footings embedded in sandy soil and under large eccentric vertical load conditions. The study focuses on an evaluation of the non-dimensional reduction factor (RF), which is the ratio between the average bearing capacity of an eccentric footing and its bearing capacity when subjected to a central load. The results indicate a significant decrease in RF when the eccentricity increases and the curve of the decrease is parabolic, even in large eccentricity cases. Based on the numerical results obtained, a new formula of the RF is proposed, and the reasons for the discrepancy between the RF proposed by several authors are identified. The values provided by the proposed formula are in close agreement with some experimental results available in the literature.

PRECAST, PRESTRESSED BOX BEAMS - A STATE-OF-THE-ART REPORT

PCI Journal ◽  
1969 ◽  
Vol 14 (1) ◽  
Author(s):  
Brice F. Bender ◽  
William G. Kriesel
Keyword(s):  
State Of The Art ◽  
Box Beams

Flexural behavior of precast concrete box beams posttensioned with unbonded, carbon-fibercomposite cables

PCI Journal ◽  
2008 ◽  
Vol 53 (4) ◽  
pp. 62-82 ◽  
Author(s):  
Nabil Grace ◽  
Tsuyoshi Enomoto ◽  
Ahmed Abdel-Mohti ◽  
Yahia Tokal ◽  
Sreejith Puravankara
Keyword(s):  
Precast Concrete ◽  
Flexural Behavior ◽  
Box Beams

Flexural Response of CFRP Prestressed Concrete Box Beams for Highway Bridges

PCI Journal ◽  
2004 ◽  
Vol 49 (1) ◽  
pp. 92-104 ◽  
Author(s):  
Nabil F. Grace ◽  
S. B. Singh ◽  
Mina M. Shinouda ◽  
Sunup S. Mathew
Keyword(s):  
Prestressed Concrete ◽  
Highway Bridges ◽  
Flexural Response ◽  
Box Beams

Dynamic Damping and Stiffness Characteristics of the Rolling Tire

2001 ◽  
Vol 29 (4) ◽  
pp. 258-268 ◽  
Author(s):  
G. Jianmin ◽  
R. Gall ◽  
W. Zuomin
Keyword(s):  
Dynamic Behavior ◽  
Variable Parameter ◽  
Low Frequency ◽  
Vertical Load ◽  
Frequency Range ◽  
Inflation Pressure ◽  
Vehicle Simulation ◽  
Dynamic Damping ◽  
Speed Range ◽  
Stiffness Characteristics

Abstract A variable parameter model to study dynamic tire responses is presented. A modified device to measure terrain roughness is used to measure dynamic damping and stiffness characteristics of rolling tires. The device was used to examine the dynamic behavior of a tire in the speed range from 0 to 10 km/h. The inflation pressure during the tests was adjusted to 160, 240, and 320 kPa. The vertical load was 5.2 kN. The results indicate that the damping and stiffness decrease with velocity. Regression formulas for the non-linear experimental damping and stiffness are obtained. These results can be used as input parameters for vehicle simulation to evaluate the vehicle's driving and comfort performance in the medium-low frequency range (0–100 Hz). This way it can be important for tire design and the forecasting of the dynamic behavior of tires.

Stress Analysis of a Tire Under Vertical Load by a Finite Element Method

1977 ◽  
Vol 5 (2) ◽  
pp. 102-118 ◽  
Author(s):  
H. Kaga ◽  
K. Okamoto ◽  
Y. Tozawa
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Computer Program ◽  
Temperature Rise ◽  
Strain Energy ◽  
Internal Stresses ◽  
Vertical Load ◽  
The Finite Element Method ◽  
Internal Temperature ◽  
Element Method

Abstract An analysis by the finite element method and a related computer program is presented for an axisymmetric solid under asymmetric loads. Calculations are carried out on displacements and internal stresses and strains of a radial tire loaded on a road wheel of 600-mm diameter, a road wheel of 1707-mm diameter, and a flat plate. Agreement between calculated and experimental displacements and cord forces is quite satisfactory. The principal shear strain concentrates at the belt edge, and the strain energy increases with decreasing drum diameter. Tire temperature measurements show that the strain energy in the tire is closely related to the internal temperature rise.

EXPERIMENTAL STUDY ON STRESSES OCCURRING IN CONNECTION OF RUBBER BEARING UNDER VERTICAL LOAD

2020 ◽  
Vol 85 (776) ◽  
pp. 1335-1345
Author(s):  
Motoki MISU ◽  
Miyuki SHIMIZU ◽  
Shigeo FUKUDA ◽  
Naoki KATO ◽  
Takeshi FURUHASHI
Keyword(s):  
Experimental Study ◽  
Vertical Load ◽  
Rubber Bearing
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