Cracking risk of concrete in negative moment area of steel-concrete composite continuous beam
Huibing Xie,Bing Han,Yue Sun,Siyi Jia,Wutong Yan
Abstract
Cracking of concrete slab in the negative moment area of steel-concrete composite continuous beam bridge is a fundamental issue affecting structural durability. The concrete slab cracks and the service crack width are determined according to factors associated with design, construction and operation conditions. In order to consider uncertainties involved in these factors, this paper conducted a probabilistic analysis on the concrete cracking in the negative moment area of steel-concrete composite continuous beams. A comprehensive risk probability assessment method for concrete cracking in negative moment area is proposed. In the probabilistic analysis, risk sources affecting the stress and maximum crack width in concrete slab are identified and quantified. The service crack width prediction model was proposed based finite element analysis, and the probability of cracking and service crack width exceeds the limit is calculated. A time-dependent probabilistic analysis is conducted for in-service composite bridge deck through modify the reinforcement stress and non-uniform coefficient considering the strain increment caused by concrete creep in tension and shrinkage. Based on the sensitivity analysis, cracking control recommendations are taken from the perspectives of constructability and material properties, and results revealed that the proposed control recommendations can effectively reduce the risk of concrete cracking in the negative moment area.
Key Words
concrete cracking; cracking control measures; negative moment area; risk probability; steel concrete composite continuous beam
Address
Huibing Xie — 1)School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China 2)Key Laboratory of Safety and Risk Management on Transport Infrastructures, Ministry of Transport, Beijing 100044, China
Bing Han — School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China
Yue Sun — School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China
Siyi Jia — School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China
Wutong Yan — School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China
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