鋼筋混凝土中短柱剪壓破壞之實驗研究

Experimental Study on Reinforced Concrete Intermediate Short Column Subjected to Shear Compression Failure

俞孟廷(Meng-Ting Yu)

指導教授 ： 黃世建

國立臺灣大學/工學院/土木工程學研究所/碩士(2021年)

https://doi.org/10.6342/NTU202101395

摘要

鋼筋混凝土之中短柱構件，在一般建築結構物中是屬於高勁度高強度但韌性較低且通常為剪力破壞控制之桿件，故在地震力作用下中短柱通常為早期破壞之結構桿件，因此了解鋼筋混凝土中短柱之破壞行為是極為重要。鋼筋混凝土柱之剪力破壞主要分成剪拉破壞與剪壓破壞。然而，過去在柱構件之研究多偏向於非韌性配筋之鋼筋混凝土柱，其破壞原因乃是因為柱箍筋間距過大或不具備耐震彎鉤等所造成之剪拉破壞。也是因為這樣，目前國內外對於剪拉破壞之研究已相當成熟，但因剪壓破壞之試體在現實世界中較不常見，故與其相關試驗資訊相當稀少。因此本研究設計四座剪壓破壞型式之鋼筋混凝土柱，改變參數為主筋量、主筋強度及軸壓比，並於國家地震工程研究中心進行鋼筋混凝土柱之剪壓破壞行為試驗。除了報告實驗觀察外，本研究也證實，剪壓破壞之試體是可以被實現的，也補足過去在剪力破壞實驗中較為缺少的實驗資料。

關鍵字

鋼筋混凝土 ； 中短柱 ； 剪力破壞 ； 剪壓行為 ； 側力位移關係

並列摘要

The reinforced concrete intermediate short columns in building structures are generally considered to be members with high lateral stiffness and strength, and they are usually susceptible to brittle shear failure. Under the attack of earthquake, intermediate short columns are often the first members to fail. Therefore, understanding the behavior of reinforced concrete intermediate short columns are necessary and significant. The shear failures of reinforced concrete columns can be divided into shear tension failure and shear compression failure. However, most of the research focus on the columns with non-ductile detailing which led to shear tension failure. Hence, the research of shear tension failure mode was quite a lot. Since shear compression failure column wasn’t so often to be seen, there was less of information related with shear compression failure column. Because of the limited experimental data, this study tested four reinforced concrete intermediate short columns which were expected to fail in shear compression failure. The varied parameters include amount and strength of longitudinal bars, and axial load ratio. These tests were held at the National Center for Research on Earthquake Engineering. All the specimens were tested under double curvature bending to experience shear compression failure and up to collapse. In this study, four specimens of reinforced concrete columns were carried out to investigate the effects of different amount and strength of longitudinal bars, and failure modes. Furthermore, the assumptions of analytical model were compared with the experiment results. Besides experimental observation, this research also reports that shear compression failure column can be realized in reality. Simultaneously, this study filled the vacancy in the database of shear failure column.

並列關鍵字

reinforced concrete ； column ； shear failure ； lateral load-displacement curve

參考文獻

ACI 318-11 (2011). “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-11).” American Concrete Institute, Farmington Hills, Mich., 503 pp.

ACI 318-14 (2014). “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14).” American Concrete Institute, Farmington Hills, Mich., 519 pp.

ACI 318-19 (2019). “Building Code Requirements for Structural Concrete (ACI 318-19) and Commentary (ACI 318R-19).” American Concrete Institute, Farmington Hills, Mich., 623 pp.

ACI 374.2R-13 (2013). “Guide for Testing Reinforced Concrete Structural Elements under Slowly Applied Simulated Seismic Loads.” American Concrete Institute, Farmington Hills, Mich., 22 pp.

ASCE/SEI 41-06 (2006). “Seismic Rehabilitation of Existing Buildings (41-06).” American Society of Civil Engineers, ASCE/SEI 41-06, Reston, VA., 411 pp.