自充填混凝土梁柱複合構件承受高溫之行為研究

Behavior of Self-Compacting Concrete Beam-Column Sub-Assemblage Subjected to Elevated Temperature

方一匡(I-Kuang Fang) ； 李其忠(Chi-Chung Lee) ； 周禮緯(Li-Wei Chou) ； 邱柏昇(Po-Sheng Chiu) ； 葉治銘(Jyh-Min Yeh) ； 劉泰慰(Tay-Wei Liu)

《中國土木水利工程學刊》 23卷1期 (2011/03) Pp. 55-64

https://doi.org/10.6652/JoCICHE.201103_23(1).0005

摘要

本文旨在探討自充填混凝土梁柱複合構件在高溫中、後之行為，並與國內之建築結構耐火性能驗證規定相印證。測試三座全尺寸之外柱與梁複合構件試體來模擬一棟七層樓鋼筋混凝土住宅結構受火害時之行為，並預測構件內部之溫度。依耐震規範設計之試體在ISO834昇溫條件燃燒三小時下，仍有良好之承力性能，混凝土爆裂發生在昇溫開始約25分鐘內。昇溫結束時，梁之撓度約為試驗前之10倍。殘餘強度試驗中，除一座試體發生剪力破壞，其餘兩座試體為梁在正彎矩區之撓曲破壞。以ANSYS軟體能合理預測試体內部之溫度。建築結構耐火性能驗證規定之耐火時效預測有待進一步研究。

關鍵字

火 ； 鋼筋混凝土 ； 梁柱接頭 ； 性能式設計

並列摘要

This paper presents the results of reinforced self-compacting concrete beam-column sub-assemblage specimens subjected to elevated temperature test. The current proposed guidelines of fire resistant performance-based design of reinforced concrete structures were also discussed. Three full-scale beam-exterior column sub-assemblage specimens were tested to simulate the behavior of a seven-story residential building subjected to fire hazard. Analysis was carried out to predict the temperature distribution of specimens. Test results revealed that specimens designed according to seismic specifications performed satisfactorily after three-hour ISO834 fire exposure. The significant explosive spalling occurred within about 25 minutes after heating. The beam deflection at the end of heating was 10 times that before heating. In the residual strength test, two specimens failed in ductile flexural mode at the positive moment region of beam, while another one failed in shear. The temperature distribution of specimens can be reasonably predicted using ANSYS software. The prediction of fire resistance of specimens based on the current specifications of fire resistant performance-based design needs further study.

並列關鍵字

fire ； reinforced concrete ； beam-column joint ； performance-based design