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Home » Case studies » UCLA / Caltrans

UCLA / Caltrans

Published on January 30 2017
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The CIDH shaft-column was designed according to standard Caltrans’ Bridge Design Specifications (1995) using the Seismic Design Criteria (1999).

Image UCLA / Caltrans

The test specimen was comprised of a 1.8 m (6 ft) diameter column extending 12.2 m (40 ft) and a 2 m (6.5 ft) diameter shaft extending 14.6 m (48 ft) below ground line, as shown in Figure 3. Steel reinforcement was comprised of 36 #14 longitudinal bars with an average yield and an ultimate tensile strength of 490 MPa (71 ksi) and 703 MPa (102 ksi) respectively and shop-welded #8 hoops at 152 mm (6 inch) spacing with an average yield and an ultimate tensile strength of 496 MPa (72 ksi) and 738 MPa (107 ksi), respectively. The longitudinal and transverse steel ratios are roughly 2 per cent and 0.7 per cent, respectively. Normal-weight ready-mix concrete was used in the specimen, with an average tested cylinder compressive strength of 42 MPa (6.1 ksi).

Aim of monitoring:
The test shaft was extensively instrumented to enable high-precision section curvature measurements and to measure contact pressure at the soil-shaft interface around the shaft perimeter. Thetesting was done to characterize the soil-shaft interaction across a wide displacement range in order to review the adequacy of existing design guidelines. The instrumentation monitored the component stresses of resistance and the effects of nonlinear soil resistance to relative displacements between the soil and shaft.

INSTALLATION PERIOD TYPE OF SENSORS NUMBER OF SENSORS
1999 SOFO 32

Main results:
The observed behavior suggests that large diameter shafts could have added capacity from side friction, which the current design models do no incorporate.

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Structure

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Sensor Installation

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Pile Failure

Related Papers:

  1. Growing Market Acceptance for Fiber-Optic Solutions in Civil Structures, T. Graver, D. Inaudi, J. Doornink, Optics East Philadelphia, USA, October 27 – 2004
  2. Combined Static and dynamic monitoring of civil structures with long-gauge fiber optic sensors, D. Inaudi, D. Posenato, B. Glisic, J. Miller, T. Graver , 23rd International Modal Analysis Conference (IMAC XXIII), Orlando, Florida, USA, 31 January-3 February – 2005
  3. Interface stresses between soil and large diameter drilled shaft under lateral loading, K. Janoyan, M. Whelan, ASCE Geotechnical Special Publication No. 124, “Drilled Shafts, Micropiling, Deep Mixing, Remedial Methods, and Specialty Foundation Systems” – 2004

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