摘要
对基于Timoshenko梁理论建立的非线性动力有限元法作了改进。根据压区理论得到混凝土的平均剪应力和平均剪应变关系,建立了能反映箍筋的抗剪作用的材料模型;此外,对结构在爆炸荷载作用下可能出现的各种响应现象进行了描述,以准确地预测梁破坏时不同位置截面上钢筋和混凝土的受力、变形及破坏情况。应用改进的材料模型,对爆炸荷载作用下的五个钢筋混凝土试验梁的动力响应和破坏形态进行了数值模拟,结果表明,该数值方法能较好地模拟钢筋混凝土梁的弯曲、弯剪和剪切等破坏形态。
A Timoshenko beam nonlinear dynamic finite element method is improved, where the shear effect of stirrups is described in the stress vs. strain relationship of concrete based on the average shear stress and average shear strain put forward by the compression filed theory. In addition, the indexes of the various failure phenomena of the reinforcement and concrete in the sections are described. The dynamic responses and failure modes of the five blast-loaded R/C beams for test are predicted by the improved procedure. It is demonstrated that the flexure, flexure-shear and shear failure modes of the blast-loaded R/C beams can be simulated by the present finite element procedure.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2003年第1期25-30,共6页
Explosion and Shock Waves
基金
国家自然科学基金项目(59708013)
关键词
振动与波
爆炸荷载
钢筋混凝土梁
动力响应
破坏形态
Beams and girders
Dynamic response
Failure (mechanical)
Finite element method
Reinforced concrete
Vibrations (mechanical)
