Analysis of NBI Data for California Bridges

Transcription

1 University of California Center on Economic Competitiveness in Transportation Analysis of NBI Data for California Bridges Rosa Vasconez, Emily Yu California State Polytechnic University, Pomona July 2016

2 What is the NBI? National Bridge Inventory (NBI) A database compiled by the Federal Highway Administration (FHWA) Used to analyzed the conditions of all the bridges and tunnels in the United States

3 Research Objective Understand the National Bridge Inventory and its resources and limitations Retrieve relevant data to the bridge population in California Analyze data to get information on bridge performance and properties

4 Methodology Analyze data from the National Bridge Inventory and the National Bridges website NBI information taken from Frequently Requested Charts Information deciphered from ASCII files National Bridges website: database that extracts information from the NBI ASCII file Provides informative data about specific counties

5 Research Parameters Material Composition Wearing Surface and Deck Protection Age Functional System Structural Status Average Daily Traffic (ADT) Ownership Federal aid and Non-federal aid bridge distribution

6 Results Information on the performance of the bridge population of California in terms of strength and serviceability Correlation of bridge performance with geographic location, material type, traffic volume and age

7 Percentage of Total of Total Bridge Count Area (%) United States Bridge Distribution Represented by Percentage of Total Bridge Area Count AK AL AR AZ CA CO CT DC DE FL GA HI IA ID IL IN KS KY LA MA MD ME MI MN MO MS MT NC ND NE NE NH NJ NM NY OH OK OR PA RI SC SD TN TX UT VA VT WA WI WV WY PR State

8 Southern California Counties 25, 406 bridges in California 38% are in Southern California

9 Distribution of California Bridges (Bridge Count) 3% 14% Kern Los Angeles 61% 5% 4% 5% 6% 2% Orange Riverside San Bernardino San Diego Ventura All Other Counties in California

10 Material Composition

11 5 Material Composition of United States Bridges Represented by Bridge Count Count of Bridges (10 4 ) Concrete Steel Other 0 AK AL AR AZ CA CO CT DC DE FL GA HI IA ID IL IN KS KY LA MA MD ME MI MN MO MS MT NC ND NE NE NH NJ NM NY OH OK OR PA RI SC SD TN TX UT VA VT WA WI WV WY PR State

12 Material Composition of of United California States Bridges 4% 3% 11% 30% Concrete Steel Other 66% 86%

13 3000 Material Composition of Southern California County Bridges 2500 Number of Bridges Concrete Steel Other Kern Los Angeles Orange Riverside San Bernardino County San Diego Ventura

14 Wearing Surface and Deck Protection Provide protection from environmental and external factors

15 12 Wearing Surfaces of United States Bridges Represented in Percentage of Total Count Percentage of Count (%) AL AK AZ AK CA CO CT DC DE FL GA HI IA ID IL IN KS KY LA MA MD ME MI MN MO MS MT NC ND NV NE NH NJ NM NY OH OK OR PA RI SC SD TN TX UT VA VT WA WI WV WY PR State

16 United California States Bridges with Wearing Surfaces 12% 42% Wearing Surface 58% None 88%

17 30 Deck Protection of United States Bridges Represented in Percentage of Total Bridge Count Percentage of Count (%) AL AK AZ AK CA CO CT DC DE FL GA HI IA ID IL IN KS KY LA MA MD ME MI MN MO MS MT NC ND NV NE NH NJ NM NY OH OK OR PA RI SC SD TN TX UT VA VT WA WI WV WY PR State

18 United California States Bridges with Deck Protection 2% 32% Deck Protection None 68% 98%

19 Age Life expectancy of bridges is 70 years old. However, accounting for external and environmental factors, life expectancy is 50 years old.

20 25 Age Age of Age of Concrete Steel of California Bridges Represented by by by Percentage of of of Bridge Count Count Percentage of of Count Count (%) (%) Year Built

21 Functional System

22 Functional Systems of California Bridges 23% 42% Principle Arterial Minor Arterial Collector 19% Local 16%

23 Structural Status

24 Functionally Obsolete: The design of the bridge is no longer functionally adequate for its task Does not accommodate traffic flow or vertical clearance is restrictive Does not meet safety regulations Structurally Deficient: The bridge is in need of maintenance There are flaws in the structure and the bridge needs repair Minor concrete cracks in bridge

25 61% Functionally Structurally Obsolete Status Deficient of Bridges California in California Bridges Southern 1% California 72% 73% 1% 10% 13% 21% 2% 17% 4% 4% 2% 4% 6% 2% 2% 3% 2% Kern Los Angeles OrangeStructurally Deficient Bridges Riverside Functionally San Bernardino Obsolete Bridges San Diego Bridges without Venturadeficiency Structurally Functionally Deficient Obsolete Bridges in other Counties

26 Count of Bridges 1, Southern California Structurally Deficient and Functionally Obsolete Bridges Represented by Count of Bridges Structurally Deficient Bridges Functionally Obsolete Bridges County

27 Count of Bridges Functionally Structurally Deficient Obsolete Steel and Concrete Bridges Concrete Steel County

28 Average Daily Traffic on Bridges Total traffic averaged over 365 days.

29 Average Number of Cars (10 8 ) Total Average Daily Traffic on Bridges AL AK AR AZ CA CO CT DC DE FL GA HI IA ID IL IN KS KY LA MA MD ME MI MN MO MS MT NC ND NE NE NH NJ NM NY OH OK OR PA RI SC SD TN TX UT VA VT WA WI WV WY State

30 Ownership

31 Ownership of California Bridges Represented by Percentage of Bridge of Area Count 4% 2% 13% 8% 18% 49% State County City Other 29% 77%

32 Federally and Non-Federally Aided Bridges

33 4 Federally and Non-Federally Aided united States Bridges Represented in Count Count of Bridges (10 4 ) Federally Aided Highway Bridge Non- Federally Aided Highway Bridge AK AL AR AZ CA CO CT DC DE FL GA HI IA ID IL IN KS KY LA MA MD ME MI MN MO MS MT NC ND NE NE NH NJ NM NY OH OK OR PA RI SC SD TN TX UT VA VT WA WI WV WY PR State

34 Conclusion Trends found in Research (bridge count and bridge area): Geographic distribution and bridge attributes Bridge condition and bridge attributes Majority of the information on bridges in the United States are not deciphered in ASCII files HTML and Excel Format NBI information limited to the tables provided on the FHWA website

35 Questions?

36 United California Wearing States Surfaces Bridges with of California Wearing Bridges Surfaces 5% 12% 42% 38% 58% Monolithic Concrete, Integral Concrete, Latex Concrete, Low Slump Concrete Wearing Surface Bituminous None 57% Epoxy Overlay, Wood or Timber, Gravel, Other 88%

37 United California Deck States Protection Bridges of with California Deck Protection Bridges 7% 2% Epoxy Coated Reinforcing 22% 32% Polymer Impregnated Deck Protection 2% 13% 68% 56% Galvanized None Reinforcing, Cathodic Protection, Internally Sealed, Other Coated Reinforcing Unknown 98%

38 Bridges on Main Freeways in California

39 US 101 I-10 I-405 I-210 I-5

40 Count of of Bridges Structurally California Number Deficient of Bridges California and and Functionally the Bridges Number in Obsolete Each of Structurally Freeway Major Freeway and Interstate Deficient/Functionally Bridges in Califonia Obsolete Represented Bridges on by the Count Freeways of Bridges Structurally Deficient Concrete Structurally Structurally Deficient Deficient Steel Functionally Functionally Obsolete Concrete Obsolete Functionally Obsolete Steel I-210 I-210 I-10 I-10 US I US 101 I-5 US I-5 101I-405 I-405I-5 I-405 Freeway Freeway Freeway

41 400 Southern California Interstate and Freeway Bridges 350 Count of Bridges I-210 I-10 US 101 I-5 I Kern Los Angeles Orange Riverside San Bernardino County San Diego Ventura