摘要
根据活性粉末混凝土(Reactive Powder Concrete,RPC)具有超高强度的特点,确定RPC梁非线性破坏模式,即受压区RPC不屈服,其应力呈线性分布;受拉区计入RPC的拉应力,并考虑其非线性阶段的贡献。在此基础上,运用自行编制的遗传算法程序调用ANSYS建立的结构分析模型,对高跨比为1/10,1/12,1/14和1/16,跨度为16,20,24和32m的铁路RPC T形梁进行优化计算。优化计算结果表明,RPC T形梁的经济高跨比为1/14;对优化结果产生主要影响的约束条件是刚度和RPC的拉应变,构造要求也会对优化计算的结果产生一定的影响。
Nonlinear failure mode of Reactive Powder Concrete （RPC） is determined according to the ultra- high strength of RPC： the compressive area concrete is assumed to be not failed and the stress distribution is linear; the tensile stress of the tensioning area concrete is calculated and the contribution of the nonlinear stage is taken into account. On the basis of the failure mode, a series of railway RPC T-beams are optimized. One genetic algorithm program is worked out to optimize the T-beams which are modeled in the ANSYS program. The depth-to-span ratio of the optimized RPC T-beams is 1/10, 1/12, 1/14 and 1/16 and the span is 16, 20, 24 and 32 m. The optimization calculation results show that the economical depth- to-span ratio of railway RPC T-beams is 1/14. The main constraint conditions to affect the optimization re- sults are the stiffness and the concrete tensile strain. The structural requirements will affect the optimization results under certain conditions.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2009年第2期38-42,共5页
China Railway Science
基金
铁道部科技研究开发计划课题(2007G030)
高等学校博士学科点专项科研基金(新教师基金课题)(20080041019)
北京交通大学科技基金资助项目(2007XM031)
关键词
铁路桥梁
活性粉末混凝土
破坏模式
优化设计
Railway bridge
Reactive powder concrete
Failure mode
Optimization design
作者简介
闫志刚（1976-），男，吉林白城人，讲师。
