應用高強度鋼筋與高強度混凝土於橋墩耐震設計之可行性研究

Feasibility Study of New RC on the Seismic Design of Bridge Column

劉光晏(Kuang-Yen Liu) ； 宋裕祺(Yu-Chi Sung) ； 張國鎮(Kuo-Chun Chang)

《結構工程》 29卷3期 (2014/09) Pp. 5-25

https://doi.org/10.6849/SE.201409_29(3).0001

摘要

本研究採用高強度混凝土與高強度鋼筋材料（NewRC），進行6組單柱式橋墩之反覆載重實驗，檢討斷面、材料與配筋組合，使NewRC橋墩在承受相近柱軸力下可獲致與一般RC橋墩相近之撓曲強度、位移韌性與消能能力。試體規劃包括RC標準試體（BMRC1）、NewRC實心斷面試體（NEWRC1、NEWRC5）及NewRC空心斷面試體（NEWRCH1、NEWRCH2、NEWRCH3）。製作方式分為4組場鑄及2組預鑄節塊橋墩，其中NEWRCH3包含後置預力。實驗結果顯示，NewRC橋墩因配置10cm間距之橫向鋼筋提高良好的圍束效果，且高寬比大及軸力比低條件，結構行為滿足公路橋梁耐震設計規範有關強度與韌性規定，確實達成斷面及材料減量的目標。結合預鑄節塊及後置預力方式施工，更進一步提高施工效率與震後復原能力。此外，本研究以既有簡化模式分析，經比較實驗結果可快速且有效預測NewRC柱之側推曲線，達到耐震設計與評估之目的。

關鍵字

高強度鋼筋混凝土 ； 橋墩 ； 耐震性能

並列摘要

This study presents the experimental study on the seismic performance of bridge column with high strength concrete and reinforcements, called New RC column. Given a specified plastic moment strength resulted from a predetermined RC column with ordinary materials, the design objective of New RC column is to provide same plastic moment strength but reducing the cross section, quantities of longitudinal and lateral reinforcement simultaneously. Total of one RC column (BMR1), two solid-section New RC columns (NEWRC1, NEWRC5) and three hollow-section New RC columns (NEWRCH1, 2, 3) were manufactured by either cast-in-place or precast and carried out by cyclical loading tests. For New RC specimens, the design compressive strength of concrete, yielding strength of longitudinal and lateral reinforcement are 70, 685, and 785 MPa, respectively, while RC column are 28, 420, and 280 MPa. Experimental results demonstrated that New RC column with sufficient lateral confinement and subjected to relative small axial load ratio can effectively reduce cross section and usage of material without losing desired flexural strength, either equipped with solid or hollow section. Besides, applying posttensioned strands within NEWRC column can provide self-centering mechanism to eliminate residual displacement. In addition, the pushover curve can be well predicted by the conventional program. The seismic performance of New RC column has been confirmed and its application can be expected in the future.

並列關鍵字

High strength concrete and reinforcement ； bridge column ； seismic performance