Cintec Pipe Anchor Retrofit System for Unreinforced Masonry (URM) and Nonductile Concrete Buildings.

2.1.1 The Cintec Pipe Anchor Retrofit System is used to retrofit unreinforced masonry (URM) structures and nonductile concrete structures. Figure 1 provides details of the system.

2.1.2 Codes and Standards: The following codes and code-related documents are incorporated by reference into this report: 1997 Uniform Code for Building Conservation (UCBC); 1997 Uniform Building Code™ (UBC); 2001 ICBO Guidelines for Rehabilitation of Existing Buildings, 1st edition; 2001 ICBO Guidelines for Seismic Retrofit of Existing Buildings; 2000 International Building Code® (IBC); Building Code Requirements for Structural Concrete (ACI 318-99), Structural Steel Buildings—Allowable Stress Design and Plastic Design (AISC ASD, 1989); and Load and Resistance Factor Design for Structural Steel Buildings, including Supplement No. 1 dated January 1998 (AISC LRFD, 1993).

2.2.1 Pipe Anchors: The Cintec Pipe Anchors are standard pipe or round, hollow structural sections complying with ASTM A 618 Grade 50, with dimensions and design properties described in the Manual of Steel Construction, Load and Resistance Factor Design or Allowable Stress Design, published by the American Institute of Steel Construction.

2.2.2 Concrete Fill: The interior area of the pipe shall be filled with normal-weight or structural lightweight concrete having, respectively, a minimum 3,000 psi (20.7 MPa) or a minimum 4,000 psi (27.6 MPa) compressive strength at 28 days. Concrete quality, mixing, and placing shall comply with Chapter 19 of the UBC or with ACI 318-99 (IBC).

2.2.3 Concrete Footings: Normal-weight concrete having a minimum 3,000 psi compressive strength at 28 days shall be used for footings. Concrete quality, mixing, and placing shall comply with Chapter 19 of the UBC or with ACI 318-99 (IBC).

2.2.4 Concrete Reinforcement: Deformed steel reinforcement bars shall comply with ASTM A 615, A 616, A 617, or A 706 Grade 60. Steel joint reinforcement for masonry shall comply with ASTM A 951 or UBC Standard 21-10 (Part I).

The design loads for the structure shall be calculated in accordance with the UCBC, UBC, IBC, Guidelines for Rehabilitation of Existing Buildings, or Guidelines for Seismic Retrofit of Existing Buildings, as applicable.

2.3.2 Analysis of the Existing Structure Materials: The existing structure shall be evaluated for in-situ material strengths in accordance with the procedures in Section 1920 of the UBC, the UCBC, Section 1916 of the IBC, or the Guidelines for Seismic Retrofit of Existing Buildings, as applicable.

2.3.3 Structural Analysis Methods: The existing structural system with the Cintec Pipe Anchor System shall be evaluated using a combination of structural methodologies described in the UBC, IBC, ACI 318-99 (IBC), AISC ASD (1989) and AISC LRFD (1993). These include linear methods, nonlinear methods, and elastic design of structural elements in accordance with the referenced codes and standards. The designer may utilize either the AISC ASD (1989) or the AISC LRFD (1993) for the design of the Cintec Pipe Anchor System.

2.3.4 Composite Columns: The design requirements for composite columns are contained in Section I2 of AISC ASD (1989) or AISC LRFD (1993). In accordance with AISC LRFD (1993), the 4 percent area limitation defines the composite action behavior for steel tube columns. According to the

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