Investigation of load carrying capacity of asymmetric high contact ratio spur gear based on load sharing using direct gear design approach

2016 ◽  
Vol 96 ◽  
pp. 52-74 ◽  
Author(s):  
P. Marimuthu ◽  
G. Muthuveerappan
Keyword(s):  
Carrying Capacity ◽  
Load Sharing ◽  
Spur Gear ◽  
Design Approach ◽  
Load Carrying Capacity ◽  
Contact Ratio ◽  
Gear Design ◽  
Load Carrying

scholarly journals Experimental Investigation of an Existing RCP Rehabilitated with a Grouted Corrugated Steel Pipe

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Bai-jian Li ◽  
Liang-sheng Zhu ◽  
Yong Li ◽  
Xin-sha Fu
Keyword(s):  
Experimental Investigation ◽  
Reinforced Concrete ◽  
Carrying Capacity ◽  
Load Sharing ◽  
Steel Pipe ◽  
Load Carrying Capacity ◽  
Pipe System ◽  
Concrete Pipes ◽  
System A ◽  
Load Carrying

Although slip-lining is the most common rehabilitation technique, few research studies have been conducted on the behavior of rehabilitated reinforced concrete pipes (RCPs). Experiments were conducted on a RCP rehabilitated with a grouted corrugated steel pipe (CSP). The RCP rehabilitated by the CSP showed an increase in both load-carrying capacity and stiffness. The grout played an important role in distributing the loads when the RCP was deteriorated, whereas the load shared by the CSP represented only a small part. When the CSP was closely fitted to the RCP at the invert, the load was shared between the PCP and CSP and the CSP carried most of the load when the RCP was fully deteriorated. The slip-lined pipe acted as a “pipe within a pipe” system. A load-sharing theory was proposed in this study and provides estimates of the load-carrying capacity of the slip-lined pipes.

scholarly journals Investigation of the Load-Sharing Theory of the RC Pipes Rehabilitated with Slip Liners

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Bai-jian Li ◽  
Liang-sheng Zhu ◽  
Xin-sha Fu
Keyword(s):  
Carrying Capacity ◽  
Load Sharing ◽  
Steel Pipe ◽  
Load Carrying Capacity ◽  
Pipe System ◽  
System A ◽  
Concrete Pipe ◽  
Hdpe Pipe ◽  
Load Carrying ◽  
Series Of Experiments

Slip-lining is a preferred rehabilitation approach in the departments of transportation in China. Although the method is the most common rehabilitation technique, few research studies have been conducted on the mechanical behavior of a rehabilitated reinforced concrete pipe (RCP). A series of experiments were conducted on RCPs rehabilitated with a corrugated steel pipe (CSP), a steel pipe, a high-density polyethylene (HDPE) pipe, and a shape steel bracket. The RCP rehabilitated with the CSP showed an increase in both the load-carrying capacity (3.46 times greater than the RCP) and the stiffness (5.35 times greater than the RCP). The RCP rehabilitated with the steel pipe, HDPE pipe, and steel bracket exhibited an increase in the load-carrying capacity (1.23, 1.50, and 1.31 times greater than the RCP, respectively), and the stiffness of these three pipes was not markedly changed. The slip-lined pipe acts as a “pipe within a pipe” system. A “load-sharing” theory was proposed in this study and provides estimates of the load-carrying capacity of the slip-lined pipes.

Structural performance of sliplined watermain

2001 ◽  
Vol 28 (6) ◽  
pp. 969-978 ◽  
Author(s):  
Jack Q Zhao ◽  
Lyne Daigle
Keyword(s):  
Carrying Capacity ◽  
Circumferential Stress ◽  
Load Sharing ◽  
Practical Method ◽  
Load Carrying Capacity ◽  
Pipe Wall Thickness ◽  
Pressure Pipe ◽  
Load Carrying ◽  
Effective Design

Rehabilitation of a watermain by grouted sliplining is usually carried out when the existing pipe is only partially deteriorated. Although designs that neglect the structural contributions from the existing pipe and the grout are generally conservative, the performance of the rehabilitated pipe needs to be better understood for effective design and management of buried water pipes. Presented in this paper is a practical method for the determination of load sharing and circumferential stresses in a sliplined pressure pipe. The laboratory tests show that the load carrying capacity of a cast iron pipe increases substantially after it is sliplined and grouted. Results also indicate that the eccentricity between the host pipe and the inserted pipe and the direction of eccentricity have an impact on the rupture load of the sliplined pipe. The effects of the host pipe wall thickness and the grout strength are also discussed. Although the method is based on a pressurized watermain, it can be used to assess the load carrying capacity of a non-pressurized pipe such as a sewer pipe. The use of this method is demonstrated through an example.Key words: performance, sliplining, watermain, circumferential stress, load sharing, grout, service life.

Dynamic Analysis of High-Contact-Ratio Spur Gears With Asymmetric Teeth

2008 ◽  
Author(s):  
F. Karpat ◽  
S. Ekwaro-Osire
Keyword(s):  
Numerical Technique ◽  
Spur Gear ◽  
Dynamic Loads ◽  
Spur Gears ◽  
Load Carrying Capacity ◽  
Contact Ratio ◽  
Mesh Stiffness ◽  
Gear Teeth ◽  
Load Carrying ◽  
Gear Contact

In this research, a numerical technique is used to study the performance of high-contact-ratio (HCR) spur gears with asymmetric teeth. Asymmetric teeth have been shown to minimize dynamic loads and to increase the load carrying capacity. This is due to the fact that these teeth have a larger pressure angle on the drive side compared to the coast side. In literature, symmetric gear teeth with HCR have been shown to also yield low dynamic loads and high load capacities. HCR gears have these positive attributes because for gears in a mesh, the number of tooth pairs sharing the transmitted load alternates between two and three. In this study, the separate benefits of an HCR gear and asymmetric teeth are unified into a spur gear with asymmetric teeth. In this case, the effect of the gear contact ratio, addendum factor, mesh stiffness, pressure angles, and operation speeds on dynamic tooth loads are considered. The influences of these parameters on dynamic response are presented and discussed. A comparison between standard and non standard gear pairs in literature is also presented, with respect to dynamic tooth loads. Sample simulation results, which were obtained by using an in-house computer program, are discussed. The results obtained are shown to match well with some related analytical and experimental results in literature. It is further demonstrated that HCR spur gears with asymmetric teeth do provide a marked advantage compared to the conventional spur gears with symmetric teeth.

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