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1813.5 Seismic reinforcement.
Where a structure is assigned to Seismic Design Category C or D, in accordance with Section 1613 and where concrete and steel are used as part of the composite pile assembly, the concrete reinforcement shall comply with Sections 1812.1.2.3 and 1812.1.2.5 and the steel section shall comply with Section 1811.7.4 or Section 1812.6.4.1.
1814.1 General.
Helical piles may be used to support axial compression, or resist axial tension and lateral loads. All helical pile foundation systems shall be approved by the commissioner in accordance with Section 28-113.2 of the Administrative Code.
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