| = 18. CHAPTER 18 — EARTHQUAKE-RESISTANT STRUCTURES | |
| = 18.11 — Special structural walls constructed using | |
| precast concrete_ | |
| == 18.11.1 Scope | |
| === 18.11.1.1 This section shall apply to special structural | |
| walls constructed using precast concrete forming part of the | |
| seismic-force-resisting system. | |
| == 18.11.2 General | |
| === 18.11.2.1 Special structural walls constructed using | |
| precast concrete shall satisfy 18.10 and 18.5.2, except | |
| 18.10.2.4 shall not apply for precast walls where deformation | |
| demands are concentrated at the panel joints. | |
| === 18.11.2.2 Special structural walls constructed using | |
| precast concrete and unbonded post-tensioning tendons and | |
| not satisfying the requirements of 18.11.2.1 are permitted | |
| provided they satisfy the requirements of ACI ITG-5.1M. | |
| = R18.11 — Special structural walls constructed | |
| using precast concrete_ | |
| == R18.11.2 General | |
| === R18.11.2.2 Experimental and analytical studies (Priestley | |
| et al. 1999; Perez et al. 2003; Restrepo 2002) have demonstrated | |
| that some types of precast structural walls post-tensioned | |
| with unbonded tendons, and not satisfying the | |
| prescriptive requirements of Chapter 18, provide satisfactory | |
| seismic performance characteristics. ACI ITG-5.1M | |
| defines a protocol for establishing a design procedure, validated | |
| by analysis and laboratory tests, for such walls, with or | |
| without coupling beams. | |
| ACI ITG-5.2 defines design requirements for one type of | |
| special structural wall constructed using precast concrete | |
| and unbonded post-tensioning tendons, and validated for use | |
| in accordance with 18.11.2.2. | |
| [ Lanjut Ke 18.12—Diaphragms and trusses ... ] | |
| | |
| | |