高強度鋼筋混凝土梁之撓曲裂縫控制設計

FLEXURAL CRACK CONTROL DESIGN FOR HIGH-STRENGTH REINFORCED CONCRETE BEAMS

邱建國(Chien-Kuo Chiu) ； 陳少謙(Shao-Qian Chen) ； 何柏霆(Bo-Ting He) ； 紀凱甯(Kai-Ning Chi)

《中國土木水利工程學刊》 30卷3期 (2018/09) Pp. 191-208

https://doi.org/10.6652/JoCICHE.201809_30(3).0004

摘要

本研究共進行七組懸臂梁試驗，另調查分析二十二組四點荷重簡支梁試驗、三組懸臂梁試驗，所有試驗皆採用高強度主筋（f_y=685MPa）搭配高強度箍筋（f_(yt)=785MPa），混凝土設計強度70及100MPa。探討國內外規範之撓曲裂縫控制方式的適用性，並以美國ACI-318規範為基礎提供高強度鋼筋混凝土梁構件之撓曲裂縫控制建議式，其中包含有鋼筋間距（s）及混凝土保護層厚度（Cc）之限制式，滿足限制式則可以在使用性載重下將裂縫寬度控制在0.4mm。

關鍵字

高強度鋼筋混凝土 ； 梁構件 ； 撓曲裂縫控制 ； 使用性載重

並列摘要

This study conducts seven full-size cantilever beams specimens using high-strength reinforced steel bars (f_y = 685 MPa, f_(yt) = 785 MPa). In addition, the investigation and analysis of twenty - two simple-supported beams and three cantilever beams. The specified compressive strength of concrete is 70 and 100 MPa. The purpose of this study is to investigate the flexural crack development of high-strength reinforced concrete beams (HSRC). The experimental data is used to verify the application of the flexural crack control formulas described in Foreign specification and related researches on HSRC beam members. The study concludes the design formulas for the flexural crack based on ACI 318-14, which contains the reinforcement spacing (s) and the thickness of the concrete protective layer (Cc) of the restrictions. Satisfying the restrictions can control the crack width at 0.4 mm under the service-level loading.

並列關鍵字

high-strength reinforced concrete ； beam members ； flexural crack control ； service-level loading