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2but also what material properties to utilize when designing repairs. This makes the repairand rehabilitation process extremely difficult.The material behavior of the historical wrought iron is very different from thatof common structural steel. The structure of historical wrought iron consists primarily offerrite iron, along with numerous deposits of impurities, commonly known as slag, thatare elongated throughout the metal. This creates a fibrous structure in historic wroughtiron, as can be seen in Figure 1.2. Since the properties of the metal vary considerably dueto the large deposits of impurities, it may be difficult to utilize typical repair proceduresused in steel structures in these historical wrought iron structures.1.2 Objective of ResearchThe research study involved three primary objectives: (1) collect informationrelated to the performance and repair of wrought iron bridge structures, (2) initiate adatabase of sample material properties through data collection and experimental testing,and (3) develop a list of suggested repair techniques for joints and members typical ofwrought iron bridge construction.Upon the completion of these objectives, the historical properties of wroughtiron were more fully understood and some typical repair procedures for historicalwrought iron bridge members were developed. The properties of wrought iron weredetermined both by collecting data from previous studies and by performing experimentaltesting with wrought iron materials from two different bridges. The repair procedureswere also developed from experimental testing and analysis of literary research.
31.3 Scope of ResearchThe scope of the research completed in this study consisted of a literaturereview / synthesis study, a survey of state Departments of Transportation and CountyEngineers, materials testing of historical wrought iron, analysis and evaluation of existingrepair procedures and the development of repair recommendations.In the literature review completed, an in-depth search of many databases suchas TRIS, METADIX, and other engineering databases was completed along with an indepthsearch of collections in the Purdue University library system, and many otherlibrary systems. In this search articles dealing with the repair and rehabilitation ofspecific bridges were found along with many articles dealing with the material propertiesand manufacturing processes of wrought iron. Also, many historic sources containingtesting data on the material properties were discovered and the data were recorded.Although the literature search did find much information about wrought iron andrehabilitations in general, little information was found relating to actual repair proceduresutilized in rehabilitating wrought iron bridge members.A survey was distributed to State DOTs, State Local Technical AssistancePrograms, Indiana County Engineers, and other engineering consultants to determine thenumber of existing historic iron bridges, and if there were any existing wrought ironrepair procedures. The results from this survey did not lead to any existing wrought ironbridge member repair procedures, but it did lead to a better understanding of the need formore knowledge concerning the behavior of historic wrought iron.Extensive material and mechanical testing was completed on wrought ironbridge members from two existing bridges in Indiana. This testing included:micrographs, chemical analysis, hardness testing, tensile coupon testing, charpy impacttesting, tensile testing of eyebar end connection, and some limited fatigue testing. Themicrographs that were taken helped to develop a better understanding of the
Page 1 and 2: Purdue UniversityPurdue e-PubsJTRP
Page 3: 1. Report No. 2. Government Accessi
Page 6 and 7: epairing a bent wrought iron tensio
Page 8 and 9: vPageCHAPTER 3TEST PROCEDURES FOR M
Page 10 and 11: ixLIST OF FIGURESFigurePageFigure 1
Page 12 and 13: xiFigurePageFigure 3.30 Top View of
Page 14 and 15: xiiiFigurePageFigure 5.12 Typical T
Page 16 and 17: xvAppendix FigurePageFigure D.7 Ini
Page 18 and 19: viiiAppendix TablePageTable A.5 Det
Page 20 and 21: iiiThe authors would also like to t
Page 24 and 25: 4microstructure of the metal. The c
Page 26 and 27: 62. LITERATURE SEARCHBefore experim
Page 28 and 29: 8imperfections, the performance of
Page 30 and 31: 10wrought iron. Adding the slag aft
Page 32 and 33: 12method for manufacturing wrought
Page 34 and 35: 14patents for their process and tra
Page 36 and 37: 16This method of testing of structu
Page 38 and 39: 18plot of this percent elongation d
Page 40 and 41: 20significant variation in the perc
Page 42 and 43: 22The practice of restoring histori
Page 44 and 45: 24Elleby, Wallace W. Sanders, F. Wa
Page 46 and 47: 26From all the surveys that were di
Page 48 and 49: 28Table 2.1 Average Ultimate Streng
Page 50 and 51: 30Figure 2.3 Wrought Iron “Sponge
Page 52 and 53: 32Histogram of Kirkaldy Wrought Iro
Page 54 and 55: 34Percent Occurance in Range - %45.
Page 56 and 57: 3660Combined Wrought Iron BarsTensi
Page 58 and 59: 38The Bell Ford Bridge consisted of
Page 60 and 61: 40Two. These samples were taken fro
Page 62 and 63: 42specimens were of constant cross
Page 64 and 65: 44Along with rectangular tensile co
Page 66 and 67: 46After the initial test loading wa
Page 68 and 69: 483.6 Fatigue TestingTo develop a b
Page 70 and 71: 50The final specimen category consi
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52This analysis was completed using
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54After the initial test was comple
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56completed, but before the surface
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58readings, load cell readings and
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60Figure 3.3 Donated Eyebars 4 and
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62Figure 3.7 Heated Areas in Blue o
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64Figure 3.11 Detail Used in Groove
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66900080007000y = 27.153xR 2 = 0.99
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68Figure 3.19 Charpy Impact Testing
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70Figure 3.23 Eyebar Connection in
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72Figure 3.27 Eyebar A After Filler
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74Figure 3.31 Side View of Finished
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76Figure 3.35 Front View of Eyebar
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78strength from the existence of pe
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80The carbon content present in the
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82value may not be very accurate bu
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84strengths was found to be 29,940
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86wrought iron bars were investigat
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88stresses are induced. These perma
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90toughness the material. The test
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92From the finite element analysis,
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94Table 4.1 Chemical Analysis of Ey
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96Table 4.3 Tensile Coupon Test Res
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98Table 4.5 Charpy Impact Test Resu
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100Table 4.7 Comparison of Strain G
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102Figure 4.1 Typical Micrograph of
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104Figure 4.5 Fracture Surface of D
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106Comparison of Tensile Strengthfo
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108Combined Wrought Iron Bar Histor
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110Figure 4.17 Macrograph of Weld u
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112Figure 4.21 Cleavage Fracture of
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Figure 4.25 Elongation of Hole in E
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116signs on or near the bridge that
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118testing of historic wrought iron
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120so that they would act in symmet
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122The reasons for the differences
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124The second corrosion pattern mod
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126Keating (1984) stated that the s
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128charcoal fire until it is red ho
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130Figure 5.3 Picture of Bottom Cho
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132Figure 5.7 Using Force After Usi
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134Figure 5.11 Reassembling a Pin C
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1366. SUMMARY, CONCLUSIONS AND IMPL
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138rectangular in shape. These eyeb
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140were joined together with a full
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1424. The Charpy impact energy of t
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144connections are unsymmetrical, i
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146LIST OF REFERENCESAASHTO (1998).
Page 168 and 169:
148Hodgkinson, Eaton (1840). Experi
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150Appendix A. Data Collected From
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152Table A.1 Wrought Iron Bar Tensi
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154Table A.1 (continued) Wrought Ir
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156Table A.2 (continued) Wrought Ir
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158Table A.3 Wrought Iron Angle Ten
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160Table A.4 (continued) Summary of
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162Table A.4 (continued) Summary of
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164Table A.5 (continued) Detailed I
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184Table A.7 Tensile Strength Data
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186Table B.1 Example Historic Wroug
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188DepartmentofTransportationIf you
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190CountyIf your organizationdoes m
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192County 16: County bridge inspect
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194State 13: Included in original d
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196Figure C.1 Diagrams Showing Loca
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198Figure C.3 Heating of Eyebar fro
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200Figure C.7 Double V Butt Joint u
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202Figure C. 11 Welded Tensile Coup
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204Figure C.15 Tensile Coupon from
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206Figure C.19 Cooling Bath with Su
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208Figure C.23 Side View of Eyebar
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210Figure C.27 Eyebar End Connectio
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212Appendix D. Welding Procedure fo
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214D.2 Filler Weld for Eyebar Conne
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216Figure D.1 Weld Joint Detail Use
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Figure D.5 Completed Weld Before Su
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220Figure D.7 Initial Pass Pattern
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