• 沒有找到結果。

根據本計畫執行成果顯示,可針對建築物耐震設計規範檢討及修訂,提出下列具體 建議。以下分別從加以列舉。

建議一

增修「鋼筋混凝土建築物耐震能力初步評估平台(PSERCB)」:中長期建議 主辦機關:內政部營建署、建築研究所

協辦機關:中華民國全國建築師公會、中華民國土木技師公會全國聯合會、中華民 國結構工程技師公會全國聯合會

鑒於目前習見之既有建物初評流程中未能將結構不規則性、底層梁柱構件強度與韌 性及P-△效應等加以量化作為評估之具體依據,尤其對既有中高樓層建物有可能影響其 評估結果之準確度,故建議在例如PSERCB 初評流程中有關結構系統之平面對稱性與立 面對稱性,可參考本計畫所擬之結構不規則性量化等級作為評分標準;並將剛重比指標 或結構穩定性因子列入評估項目中以適切反映

P-Δ 效應;另外,亦可將本計畫所採用之

柱構件剪力比指標與強柱弱梁檢核指標列入評估項目中以適切考量梁柱破壞模式之影 響。後續將持續與PSERCB 研究團隊、專家學者,與建築師及專業技師公會研商取得共 識後,由主辦機關進行「鋼筋混凝土建築物耐震能力初步評估平台(PSERCB)」增修訂

工作。建議內政部建築研究所未移交評估平台(PSERCB)至內政部營建署前,本項業務 仍由內政部建築研究所主辦,俟評估平台(PSERCB)移交至內政部營建署後,本項業務 改由內政部營建署主辦。

建議二

增訂「建築物耐震設計規範及解說」有關結構贅餘度相關規定:中長期建議 主辦機關:內政部營建署

協辦機關:內政部建築研究所

由於國內現行建築物耐震設計規範尚未訂定有關結構贅餘度之相關規定,然而結構 贅餘度之良窳與否著實會影響中高樓層建物之耐震性能,故建議應儘速納入國內現行建 築物耐震設計規範修訂規劃內容中。建議增訂條文及解說內容如下:

條文部份:

任一結構可依其配置,以下列方式決定結構贅餘度因子

ρ,並以 ρ 值乘以結構韌性

容量

R 以反映結構贅餘度之影響:

在考慮的地震方向上,至少有兩個平行的單跨度抗震構架,ρ=0.8。

在考慮的地震方向上,至少有兩個平行的雙跨度抗震構架,ρ=1.0。

在考慮的地震方向上,至少有三個平行的三跨度抗震構架,ρ=1.25。

解說部份:

在MOC-2008 規範(Comisión Federal de Electricidad, 2009)條文之規定中,使用抗震 構架之跨度數來反應結構贅餘度之大小,並用結構贅餘度因子

ρ 來修正結構韌性容量以

反映結構贅餘度對耐震能力之影響,根據Tena-Colunga and Cortés-Benítez (2015)之研 究,結構贅餘度越大,可有效確保結構韌性容量及抗側力強度。

ABSTRACT

The Mw 6.6 Meinong earthquake occurred on 6 February 2016 in the southern region of Taiwan. The earthquake caused significant damage in and around Tainan city, with a number of collapsed and severely damaged buildings and 117 deaths. Building reconnaissance includes commercial/residential buildings and school buildings. The observed structural damage was characteristic of non-ductile and poorly configured buildings. The collapsed buildings all contained irregularities and soft-stories. The majority of older mixed-use buildings performed adequately, but severe column failures were observed in several taller apartment buildings constructed in the 1990s. The building damage modes for the this earthquake can be summarized as follows: (1) presence of soft and weak first story, (2) lack of redundancy, (3) lack of lateral reinforcement, and (4) imbedded pipelines in column. Almost all of the collapsed and severely damaged buildings observed were constructed within a 10-year window between 1988 and 1998. No significant damage was reported to buildings designed and constructed post-1999 and most of the older mixed-use privately owned buildings performed adequately of the collapsed and severely damaged buildings, the majority appeared to be due to column failures on the ground floor due to a combination of poor structural configuration and detailing. In order to reduce the risk posed by critical structural weaknesses and improve the safety and resilience of these buildings, the efficient seismic performance evaluation and monitoring methods for mid-to-high rise buildings have to be developed for emergency need. The objective of this project is to survey the effects of soft/weak first story, non-ductile reinforcement, structural irregularity and structural redundancy on the seismic performance of mid-to-hgh rise buildings in Taiwan. In order to upgrade the applicability of the current seismic design code and preliminary seismic evaluation procedure of building structures, some revised drafts corresponding to P-Δ effect, redundancy factor, stiffness-to-weight ratio and structural irregularity in the current issued seismic design codes are proposed. Finally, some revised recommendations are referenced for the future modification.

Keywords: soft and weak story, non-ductile reinforcement, structural irregularity

相關文件