N.Y.C. Admin. Code § BC 1619: Section BC 1619: Temporary Structures and Temporary Construction Installations

1619.1 General.

Temporary construction installations that are required by this code to be designed by a registered design professional, and all temporary structures, shall comply with all the provisions of this code, except as described in Sections 1619.3 and 1619.4.

1619.2 Definitions.

The following terms are defined in Chapter 2:

TEMPORARY CONSTRUCTION INSTALLATIONS.

TEMPORARY STRUCTURES.

1619.3 Temporary construction installations.

Temporary construction installations shall be subject to the requirements of this section and Chapter 33.

1619.3.1 Design drawings for temporary construction installations.

Design loads, including location and intensity of live loads, shall be indicated on the design drawings for temporary construction installations. Drawings for multilevel temporary construction installations shall indicate the maximum number of levels to be loaded simultaneously and the maximum design loads. Any temporary construction installation utilizing authorized exemptions and load reductions in the structural design shall be indicated on drawings as temporary, and all reduced loads shall be indicated on the drawings. The environmental load mitigations shall be indicated on the design drawings. The design drawings shall be maintained at the site of the temporary construction installation and be made available to the department upon request.

1619.3.2 Loads for temporary construction installations.

Temporary construction installations shall be designed and constructed to resist the loads and load combinations required by this chapter for permanent construction and Chapter 33 of the building code. Live loads shall not be less than the code prescribed value or the maximum loads for the use of a temporary construction installation as noted on the design drawings.

Exceptions:

1. Load reductions may be utilized where permitted by Section 1619.3.3.

2. Derricks not permanently mounted to a building shall not be subject to the loads and load combinations of this chapter. Such derricks shall instead be subject to the requirements of Section 3319 and rules promulgated by the commissioner. However, temporary construction installations used to support such derricks shall be subject to the loads and load combinations of this chapter.

3. Mobile cranes shall not be subject to the loads and load combinations of this chapter. Mobile cranes shall instead be subject to the requirements of Section 3319 and rules promulgated by the commissioner. However, temporary construction installations used to support mobile cranes shall be subject to the loads and load combinations of this chapter.

1619.3.3 Load reductions for temporary construction installations.

Temporary construction installations shall be permitted to reduce the design environmental loads required by this chapter in accordance with the specifications below. An action plan for load reductions shall be required in accordance with Section 1619.5.

1.

Seismic resistance. Temporary construction installations do not need to consider seismic design. These installations, other than supports of excavation, shall be designed for a minimum of 2 percent of the dead and live load as a service level lateral force. This load shall be used in lieu of seismic forces required by Section 1613 in load combinations including seismic forces. This load shall be distributed in proportion to the design loads, applied in any horizontal direction, and need not be combined with other environmental loads.

2.

Wind. The wind design for temporary construction installations shall be computed as required by Section 1609. The basic wind speed used to design the temporary construction installation shall be permitted to be reduced by applying a factor of 0.8.

Exceptions: The following are exceptions to item 2 concerning load reductions for wind design:

1. Mast climbers shall not be permitted to reduce wind loads.

2. Suspended scaffolds shall be designed for an out of service wind speed of at least 45 mph (72.4 kph), or a lower speed when so specified by the scaffold manufacturer.

3.

Other environmental forces. Other environmental forces, including but not limited to snow, flood, ice, and temperature differential effects, shall be permitted to be reduced as appropriate for the limited seasonal exposure of the temporary construction installation.

1619.3.4 Permit renewal for temporary construction installations that utilize an action plan.

Where a temporary construction installation requires an action plan in accordance with Section 1619.5, the application to renew the permit for such temporary construction installation shall be accompanied by the submission of a report from a registered design professional certifying, based on an inspection of the temporary construction installation performed by the registered design professional within 30 days prior to the submittal of the permit renewal application, that the action plan:

1. Is still in effect;

2. Has been revised to reflect the current conditions of the temporary structure; or

3. Is no longer required, as the temporary structure has been retrofitted to comply with the loads for new construction without any reduction, pursuant to Section 1619.3.2.

1619.4 Temporary structures.

Temporary structures shall be subject to the requirements of Section 3103.1 and this section.

1619.4.1 Design drawings for temporary structures.

Design loads, including location and intensity of live loads, shall be indicated on the design drawings for temporary structures. Drawings for multilevel temporary structures shall indicate the maximum number of levels to be loaded simultaneously and the maximum design loads. Any temporary structure utilizing authorized exemptions and load reductions in the structural design shall be indicated on drawings as temporary, and all reduced loads shall be indicated on the drawings. The environmental load mitigations shall be indicated on the design drawings. The design drawings shall be maintained at the site of the temporary structure and be made available to the department upon request.

1619.4.2 Loads for temporary structures.

Temporary structures shall be designed and constructed to resist the loads and load combinations required by this chapter. Live loads shall not be less than the code prescribed value or the maximum loads for the use of a temporary structure as noted on the design drawings.

Exception: Load reductions may be utilized where permitted by Section 1619.4.3.

1619.4.3 Load reductions for temporary structures.

Temporary structures shall be permitted to reduce the design environmental loads required by this chapter in accordance with the specifications below. An action plan for load reductions shall be required in accordance with Section 1619.5.

1.

Seismic resistance. Temporary structures do not need to consider seismic design. Temporary structures shall be designed for a minimum of 2 percent of the dead and live load as a service level lateral force. This load shall be used in lieu of seismic forces required by Section 1613 in load combinations including seismic forces. This load shall be distributed in proportion to the design loads, applied in any horizontal direction, and need not be combined with other environmental loads.

2.

Wind. The wind design for temporary structures shall be computed as required by Section 1609. The basic wind speed used to design the structure shall be permitted to be reduced by applying a factor of 0.8.

Exception: In lieu of applying a factor of 0.8, temporary structures may be removed from service at the environmental conditions determined by the manufacturer of the temporary structure. The threshold for removal of service shall be indicated on the design drawings required by Section 1619.4.1 as well as the action plan required by Section 1619.5.

3.

Other environmental forces. Other environmental forces, including but not limited to snow, flood, ice, and temperature differential effects, shall be permitted to be reduced as appropriate for the limited seasonal exposure of the temporary structure.

1619.4.4 Duration of time for temporary structures.

Temporary structures shall be erected for a limited period not exceeding ninety days in accordance with Article 111 of Title 28 of the Administrative Code. Such limited period shall be counted from the date the temporary structure is substantially completed.

Exception: Where the commissioner has approved a request to extend the duration of time for a temporary structure in accordance with Section 1619.4.5.

1619.4.5 Extension of time for temporary structures.

Subject to the approval of the commissioner, the duration of time for a temporary structure may be extended by increments not to exceed ninety days. Each request to extend the time for a temporary structure shall be accompanied by the submission of a report from a registered design professional certifying the following:

1. Such registered design professional performed an inspection within the last 30 days to confirm that the temporary structure complies with the requirements of the approved construction documents for the temporary structure; and

2. Where an action plan is utilized in accordance with Section 1619.5:

2.1. It is still in effect;

2.2. It has been revised to reflect the current conditions of the temporary structure; or

2.3. It is no longer required, as the temporary structure has been retrofitted to comply with the loads for new construction without any reduction, pursuant to Section 1619.4.2.

1619.5 Action plan.

All temporary structures or temporary construction installations with reduced design environmental loads in accordance with Section 1619.3.3 or 1619.4.3 shall include environmental load mitigation measures as part of an action plan to protect the public. The action plan measures shall be indicated on the design drawings required by Section 1619.3.1 or 1619.4.1.

Exception: An action plan is not required for:

1.

Derricks not permanently mounted to a building. Derricks not permanently mounted to a building shall be secured in accordance with a wind action plan as specified in rules promulgated by the commissioner.

2.

Mobile cranes. Mobile cranes shall be secured in accordance with a wind action plan as specified in rules promulgated by the commissioner.

3.

A suspended scaffold. Suspended scaffolds shall be secured in accordance with the requirements of Section 3314; requirements for securing suspended scaffolds shall be indicated on design drawings when required by Section 3314.

1619.5.1 Implementation.

The action plan shall be such that it can be reliably implemented within one day of notice or less as appropriate for the actions.

1619.5.2 Components.

The action plan shall, at a minimum, include the following:

1. Threshold of predicted environmental loads;

2. Method of monitoring environmental loads;

3. Name of party responsible for monitoring loads and determining implementation of action plan;

4. Name of party responsible for implementing the action plan;

5. Evacuation procedures;

6. Safety zone, standoff distance or standoff perimeter as appropriate. Safety zone, standoff distance or standoff perimeter shall not extend beyond the property line;

7. Any other activities, such as the addition or removal of structural and/or nonstructural elements, removal of loads or creating sacrificial elements so that the structure may resist unreduced forces as required for permanent structures;

8. Plan to prevent wind-born debris; and

9. Verification that the design and procedures shall not adversely impact other structures.