Author: Qin Qian
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 98
Book Description
Efficient removal of stormwater runoff from bridge deck surfaces is an important safety issue. This study investigates hydraulic performance characteristics of a new type of rectangular bridge deck drain. A physical modeling study was conducted to evaluate the hydraulic performance of the innovative rectangular bridge deck drain as a function of the approach discharge, different drain configurations, and bridge characteristics. Experiments included different numbers of open drains in series for variable approach discharge cross slope and longitudinal slope. Measurements included gutter flow depth (Y) and ponding width (T) at different stations along the deck, and the capture discharge and bypass discharge. A model equation is presented for predicting the capture discharge as a function of drain size (L+W), the number of open drains (N), Manning's coefficient (n), depth of approached gutter flow (Y), longitudinal slope (S0), and cross slope (Sx). For experiments considering one through five drains in series (1-5 drains), the rating curve for each individual drain is the same when the drain size is 4 by 8 inches; however, the rating curve decreases slightly with successive drains when the drain size is 6 by 8 inches.
Hydraulic Performance Small Scale Bridge Deck Drains
Author: Qin Qian
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 98
Book Description
Efficient removal of stormwater runoff from bridge deck surfaces is an important safety issue. This study investigates hydraulic performance characteristics of a new type of rectangular bridge deck drain. A physical modeling study was conducted to evaluate the hydraulic performance of the innovative rectangular bridge deck drain as a function of the approach discharge, different drain configurations, and bridge characteristics. Experiments included different numbers of open drains in series for variable approach discharge cross slope and longitudinal slope. Measurements included gutter flow depth (Y) and ponding width (T) at different stations along the deck, and the capture discharge and bypass discharge. A model equation is presented for predicting the capture discharge as a function of drain size (L+W), the number of open drains (N), Manning's coefficient (n), depth of approached gutter flow (Y), longitudinal slope (S0), and cross slope (Sx). For experiments considering one through five drains in series (1-5 drains), the rating curve for each individual drain is the same when the drain size is 4 by 8 inches; however, the rating curve decreases slightly with successive drains when the drain size is 6 by 8 inches.
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 98
Book Description
Efficient removal of stormwater runoff from bridge deck surfaces is an important safety issue. This study investigates hydraulic performance characteristics of a new type of rectangular bridge deck drain. A physical modeling study was conducted to evaluate the hydraulic performance of the innovative rectangular bridge deck drain as a function of the approach discharge, different drain configurations, and bridge characteristics. Experiments included different numbers of open drains in series for variable approach discharge cross slope and longitudinal slope. Measurements included gutter flow depth (Y) and ponding width (T) at different stations along the deck, and the capture discharge and bypass discharge. A model equation is presented for predicting the capture discharge as a function of drain size (L+W), the number of open drains (N), Manning's coefficient (n), depth of approached gutter flow (Y), longitudinal slope (S0), and cross slope (Sx). For experiments considering one through five drains in series (1-5 drains), the rating curve for each individual drain is the same when the drain size is 4 by 8 inches; however, the rating curve decreases slightly with successive drains when the drain size is 6 by 8 inches.
Experimental Study on Hydraulic Performance of Rectangular Bridge Deck Drains
Author: Heath Thompson
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 190
Book Description
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 190
Book Description
Hydraulic Performance of Structures for Bridge Drainage
Author: Stanley C. Kranc
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 64
Book Description
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 64
Book Description
Bridge Deck Drainage: Evaluation of KDOT’s Current Design Guidance
Author: Alexander Michalek
Publisher:
ISBN:
Category :
Languages : en
Pages : 92
Book Description
Proper drainage of bridge decks is essential for vehicle safety and bridge sustainability. The evaluation of Kansas Department of Transportation (KDOT) design guidelines could reduce the likelihood of future deck drainage problems. Therefore, this research investigated current bridge deck drainage design guidelines and related literature and surveyed 22 Departments of Transportation (DOTs) to identify deck drainage issues, solutions, designs, and guidance. This study utilized a scaled physical model and varying downspout shapes and sizes to investigate the hydraulic performance of current KDOT deck drainage design and evaluate grate efficiency and lateral spread. Experimental variables included deck cross slope, longitudinal slope, and approach discharge. This study also compared a curved vane grate to the current KDOT bar grate to determine differences in drainage efficiency. An erosion rate test was performed between the two grate types to determine if changing from a rectangular vane to a curved vane could increase cleanout potential, thereby alleviating problems related to inlet clogging. Experimental results indicated increasing the downspout size from 8 inches to 10 inches or changing the downspout shape from circular to square could increase drainage efficiency with no negative impacts to performance. The curved vane grate showed similar hydraulic performance (i.e., efficiency) to the KDOT rectangular vane grate, and erosion results indicated that the curved vane grate performed similarly to the rectangular grate for cleanout of accumulated debris within the grate. Although experimental results indicated similar performance of rectangular and curved vane grates, DOT survey results showed superior in-field performance of curved-vane grates.
Publisher:
ISBN:
Category :
Languages : en
Pages : 92
Book Description
Proper drainage of bridge decks is essential for vehicle safety and bridge sustainability. The evaluation of Kansas Department of Transportation (KDOT) design guidelines could reduce the likelihood of future deck drainage problems. Therefore, this research investigated current bridge deck drainage design guidelines and related literature and surveyed 22 Departments of Transportation (DOTs) to identify deck drainage issues, solutions, designs, and guidance. This study utilized a scaled physical model and varying downspout shapes and sizes to investigate the hydraulic performance of current KDOT deck drainage design and evaluate grate efficiency and lateral spread. Experimental variables included deck cross slope, longitudinal slope, and approach discharge. This study also compared a curved vane grate to the current KDOT bar grate to determine differences in drainage efficiency. An erosion rate test was performed between the two grate types to determine if changing from a rectangular vane to a curved vane could increase cleanout potential, thereby alleviating problems related to inlet clogging. Experimental results indicated increasing the downspout size from 8 inches to 10 inches or changing the downspout shape from circular to square could increase drainage efficiency with no negative impacts to performance. The curved vane grate showed similar hydraulic performance (i.e., efficiency) to the KDOT rectangular vane grate, and erosion results indicated that the curved vane grate performed similarly to the rectangular grate for cleanout of accumulated debris within the grate. Although experimental results indicated similar performance of rectangular and curved vane grates, DOT survey results showed superior in-field performance of curved-vane grates.
Road and Bridge Deck Drainage Systems
Hydraulic Characteristics of Recessed Curb Inlets and Bridge Drains
Author: Edward Raymond Holley
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 94
Book Description
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 94
Book Description
Road and Bridge Deck Drainage Systems
Author: Jiri Marsalek
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 16
Book Description
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 16
Book Description
Bridge Deck Drains
Author: I. R. Aarset
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 152
Book Description
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 152
Book Description
Bridge Deck Drainage Guidelines
Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 60
Book Description
Bridge-deck design, at present, often includes costly bridge-deck drainage provisions. Many bridge engineers have questioned the need for bridge-deck drainage appurtenances, at least to the extent presently included in typical bridge design. This document presents criteria to determine if bridge drainage scuppers and drains are required. A design nomograph allows a rapid decision to be made. A key variable, design rain intensity, is analyzed: the rational method is reviewed and new methods for setting design rain intensity are presented that consider hydroplaning and driver vision. Regardless of the need for scuppers, bridge-end drainage is necessary, and methods are given. If scuppers are needed, this document provides sound drainage design practice for bridge drainage.
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 60
Book Description
Bridge-deck design, at present, often includes costly bridge-deck drainage provisions. Many bridge engineers have questioned the need for bridge-deck drainage appurtenances, at least to the extent presently included in typical bridge design. This document presents criteria to determine if bridge drainage scuppers and drains are required. A design nomograph allows a rapid decision to be made. A key variable, design rain intensity, is analyzed: the rational method is reviewed and new methods for setting design rain intensity are presented that consider hydroplaning and driver vision. Regardless of the need for scuppers, bridge-end drainage is necessary, and methods are given. If scuppers are needed, this document provides sound drainage design practice for bridge drainage.
Hydraulics of bridge waterways
Author: Joseph N. Bradley
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 111
Book Description
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 111
Book Description