3130 BROADWAY 2021-12-20 - Laserfiche WebLink

1 beams and foundations that will further limit their effectiveness as a lateral system. This deficiency is more significant in the transverse (i.e., north-south)direction due to less bracing. In addition,the existing foundation wall along the west exterior wall does not appear to be part of the existing lateral system,as indicated by the permit drawings,which further increased the lateral deficiency in this direction. Depending on the construction and condition of the retaining wall,a potential collapse of this wall will damage the gravity-carrying capacity of the adjacent posts,which in turn could initiate collapse of the building. Code Analysis The building has sustained substantial damage (i.e.,deterioration)to the west wall sheathing and wall framing(i.e.,vertical lateral element). A lateral evaluation shall be performed per the 2015 International Property Maintenance Code (IPMC)Sections 102.3 and 304.1.1,and 2015 International Existing Building Code (IEBC)Sections 606.2.2 and 606.2.2.1. The lateral evaluation shall consider the full lateral forces to be resisted by the west wall for the transverse direction unless: 1)documentation substantiating and evaluating the lateral performance of the post-and-beam system is included;or 2) supplemental vertical lateral elements are provided. The build is not anticipated to comply with IEBC Section 606.2.2.2,and therefore the repaired shear wall shall comply with Section 606.2.2.3. The wall shall include a foundation system and holdown anchorage. In addition,the project structural engineer-of-record (SER)shall issue a letter addressing the detailed observations contained in this report and verifying that the observed conditions do not constitute dangerous conditions in the structural system. The SER shall provide supporting documentation (e.g., calculations,etc.)substantiating their conclusions as needed. Where deemed appropriate,the SER may propose additional retrofits to mitigate the conditions, in part or in whole,in lieu of verifying they are acceptable to remain as-is. See IPMC Sections 101.3, 104.1, 108.1.1, 108.1.5 Items 3,4,and 5,304.1.1 Items 2 and 6,and 305.1.1 Items 2 and 6. See IEBC Sections 104.1, 104.2, 104.3, 105.1, 106.1, and 606.1. Detailed Observations The general condition of the building was observed to be in a state of disrepair and deterioration, though some damaged portions of the building(e.g.,exterior walkways and stairways,west wall, etc.) have already been demolished and partially rebuilt. The observable structural systems, not including the exterior walkways,stairs, and west wall,were generally found to be in good condition (i.e., not exhibiting obvious signs of deterioration or damage). The following is a detailed list of observations: a. The eastern half of the building was observed to have settled relative to the western half. Maximum relative settlement is estimated in the magnitude of at least 1 to 2 inches, but not exceeding 6 inches. Indicates of settlement include: i. Exterior window sills on the north and south walls were observed to be relatively aligned and flat for the western half of the building,then angled downward east of the building midpoint.