Research on the Bearing Capacity of the Cross Section of Reinforced Concrete Beams Strengthened with Increasing Section Method Considering the Effect of the Second Loading
Ma Huixiang *
School of Civil Engineering and Architecture, Chongqing Jiaotong University, Chongqing, China
Li Zhigang
School of Civil Engineering and Architecture, Chongqing Jiaotong University, Chongqing, China
Yue Zhang
Shanhaiguan Shipbuilding Industry Company Limited, Hebei, China
Xu Haoran
China Metallurgical Construction Group Co., Ltd. Chongqing City Steel Structure Company, Chongqing, China
*Author to whom correspondence should be addressed.
Abstract
The reinforcement construction of the structure in the presence of initial loads, which always results in the effect of a secondary load. However, the calculation method and formula on bearing capacity of normal section of reinforced concrete beams has not been clearly stated when considering the steel quantity and reinforcement proportional boundary in the reinforcing layer under the secondary load. By analyzing the ultimate damage of reinforced concrete beams strengthened by increasing the section at different initial loads, this paper studies the effects of secondary load on the maximum amount of reinforced steel and the normal section bearing capacity for reinforced concrete strengthened beams, getting the normal section bearing capacity calculation formula of reinforced concrete strengthened beam under the reinforcement steel boundary. Finite Element Analysis software Abaqus and mathematical formula derivation are adopted to calculate and analyze comparatively, which shows that the calculating results and these analysis were well agreed. The new algorithm simplifies the original calculation process and provides theoretical basis for structural reinforcement bearing capacity calculation.
Keywords: Increasing section method, the maximum amount of reinforced steel, bearing capacity, second loading, reinforced concrete beams