Study on the Cracking Control Design for High Strength RC Beams

• Main Authors: BO-TING HE, 何柏霆
• Other Authors: Chien-Kuo Chiu
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/68cbmp

碩士 === 國立臺灣科技大學 === 營建工程系 === 106 === II Abstract This study conducts seven full-size cantilever beams specimens using high-strength reinforced steel bars (fy=685Mpa, fyt=785Mpa) . 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 or span-depth ratio(Ln/D) of the restrictions, satisfying the restrictions can control the crack width at 0.4mm under the usage load. In the control of shear crack , according to the existing research results to provide span-depth ratio(Ln/D) of the restrictions, so that the amount of shear steel only need to consider the seismic demand and control the shear crack width at 0.4mm under the usage load.