A METHOD OF MEASURING DYNAMIC FORCES IN SCAFFOLDING FALSEWORK STRUCTURES

A method has been developed to measure dynamic forces in falsework arising from such sources as construction operations, movement of plant and wind effects. It uses a measuring unit which clamps easily around the tubular members of the falsework and employs strain sensitive elements to establish the mean strain developed in the member when a force is applied. These elements consist of electrical resistance strain gauges bonded to spring steel strips. By calibrating with respect to the cross sectional area of the member, the magnitude of the force can be determined. Continuous recording techniques are used to monitor dynamic effects during construction operations. A change of strain of 2 microstrain can be detected, with an overall accuracy of 2 per cent. For standard mild steel scaffolding members this is equivalent to a force of approximately 0.2 kn. The overall accuracy for the measurement of force is estimated as 3 per cent. A trial during the construction of a motorway overbridge has confirmed the practical application of the method developed. (A) /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02667045
• Corporate Authors:

  Transport and Road Research Laboratory (TRRL)

  Wokingham, Berkshire  United Kingdom 
• Authors:
  • Ryan, P C
• Publication Date: 1976

Language

• English

Media Info

• Features: Figures; Photos; References;
• Pagination: 21 p.
• Serial:
  • Publication of: Transport and Road Research Laboratory
  • Publisher: Transport and Road Research Laboratory (TRRL)
  • ISSN: 0266-7045

Subject/Index Terms

• TRT Terms: Bridges; Calibration; Construction management; Construction sites; Continuous structures; Deformation; Design; Dynamic loads; Dynamics; Electricity; Falsework; Force; Freeways; Measurement; Measuring instruments; Recording; Resistance (Electricity); Scaffolds; Strain gages; Strain measurement; Wind
• Old TRIS Terms: Construction operations; Recording systems
• ITRD Terms: 6155: Apparatus (measuring); 3455: Bridge; 6171: Calibration; 3628: Construction site; 9006: Continuous; 5595: Deformation; 9011: Design (overall design); 5473: Dynamics; 6954: Electricity; 3423: Falsework (bridge); 5421: Force; 6136: Measurement; 2752: Motorway; 5562: Strain gauge
• Subject Areas: Bridges and other structures; Construction; Design; Highways; I24: Design of Bridges and Retaining Walls; I53: Construction of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00149713
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: TRRL SR 233 UC Monograph
• Files: ITRD, TRIS, ATRI
• Created Date: Aug 4 1977 12:00AM