Effects on Deflection and Stress in Balanced Cantilever Bridge due to Modification of Construction Plan

Authors

  • สุทธิพงษ์ ชมพิกุล
  • ธรรมนูญ สุสำเภา

Keywords:

Balanced cantilever bridge, Analysis with construction stage, Modification of constructio

Abstract

In this research, SAP2000 program were employed to analyze a cast-in-situ pre-stressed concrete balanced cantilever bridge. Construction stages were taken into account. The bridge main span is 80 m and was designed according to AASHTO LRFD 2012 standard with 7 days/segment construction duration (TS) using movable formworks with 450 kN weight each (CE). This was compared to cases where construction plan was adjusted, i.e., TS = 10, 13, or 16 days and/or CE = 517.5, 585 or 675 kN.

From the analyses, deflections and stresses were obtained at various points and at various times. Important values are difference in deflections between cantilever ends of the beams at mid-span of the bridge before joining (Dˊ) and stresses in beams at pier segment and at mid-span at 10,000 days after joining (s). The values in cases where construction was as planned and was adjusted were compared and shown in graphs. Dˊ was maximal at 40.5% when TS was 16 days and CE was 675 kN. s was maximal at 20.1% when TS was 16 days and CE was 675 kN.

References

[1] A. Bishara and N. Papakonstantinou, “Analysis of Cast-In-Place Concrete Segmental Cantilever Bridges,” American Society of Civil Engineers, vol. 11, pp. 1247–1268, 1990.
[2] H. Chiu, J. Chern and K. Chang, “Long-Term Deflection Control in Cantilever Prestressed Concrete Bridges,” American Society of Civil Engineers, vol. 122, pp. 489–494, 1996.
[3] P. Mondorf, J. Kuprenas and E. Kordahi, “Segmental Cantilever Bridge Construction Case Study,” American Society of Civil Engineers, vol. 123, pp. 78–84, 1997.
[4] C. Lglesias, “Long-Term Behavior of Precast Segment Cantilever Bridges,” American Society of Civil Engineers, vol. 3, pp. 340–349, 2006.
[5] Department of Highways, Kingdom of Thailand, “Standard Drawings for Long Span Bridge,” June, 2006.
[6] AASTHO, LRFD Bridge Design Specifications, 6th ed., American Association of State Highway and Transportation Officials, Washington, DC, 2012.

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Published

2020-06-22

How to Cite

[1]
ชมพิกุล ส. . . and สุสำเภา ธ. . ., “Effects on Deflection and Stress in Balanced Cantilever Bridge due to Modification of Construction Plan”, Eng. & Technol. Horiz., vol. 34, no. 2, pp. 78–84, Jun. 2020.

Issue

Vol. 34 No. 2 (2017): April -June

Section

Research Articles

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