Oxnard Municipal Code § 12.11 California Building Code

Wood Diaphragms. The anchorage of concrete or masonry structural walls to wood diaphragms shall be in accordance with AWC SDPWS 4.1.5.1 and this section. Continuous ties required by this section shall be in addition to the diaphragm sheathing. Anchorage shall not be accomplished by use of toe nails or nails subject to withdrawal, nor shall wood ledgers or framing be used in cross-grain bending or cross-grain tension. The diaphragm sheathing shall not be considered effective as providing ties or struts required by this section.

For wood diaphragms supporting concrete or masonry walls, wood diaphragms shall comply with the following:

1. The spacing of continuous ties shall not exceed 40 feet. Added chords of diaphragms may be used to form sub-diaphragms to transmit the anchorage forces to the main continuous crossties.

2. The maximum diaphragm shear used to determine the depth of the sub-diaphragm shall not exceed 75% of the maximum diaphragm shear.

(P) Section 1613.8.3: Add Section 1613.8.3 to read as follows:

1613.8.3. Modification to ASCE 7 Section 12.12.3. ASCE 7 Section 12.12.3, Equation 12.12-1 is modified to read as follows:[Figure]

(Eq. 12-12.1)

(Q) Section 1704.6: Amend Section 1704.6 to read as follows:

1704.6. Structural Observations. Where required by the provisions of Section 1704.6.1 or 1704.6.2, or 1704.6.3, the owner shall employ a structural observer to perform structural observations. Structural observation does not include or waive the responsibility for the inspections in Section 110 or the special inspections in Section 1705 or other sections of this code. The structural observer shall be one of the following individuals:

1. The registered design professional responsible for the structural design, or

2. A registered design professional designated by the registered design professional responsible for the structural design.

The registered design professional responsible for the structural design shall submit to the building official a written statement identifying the frequency and extent of structural observations. This written statement shall be made part of the construction documents prior to permit issuance.

At the conclusion of the work included in the permit, the structural observer shall submit a final report which states that all observed deficiencies have been resolved, prior to acceptance of the work by the building official.

(R) Section 1705.3: Amend Section 1705.3 to read as follows:

1705.3. Concrete Construction. The special inspections and verifications for concrete construction shall be as required by this section and Table 1705.3.

EXCEPTIONS: Special inspection and test shall not be required for:

1. Isolated spread concrete footings of buildings three stories or less in height that are fully supported on earth or rock, where the structural design of the footing is based on a specified compressive strength, f'c, no greater than 2,500 pounds per square inch (psi) (17.2 Mpa).

2. Continuous concrete footings supporting walls of buildings three stories or less in height that are fully supported on earth or rock where: