EPS混凝土动态力学性能研究

PDF(1768 KB)

振动与冲击 ›› 2011, Vol. 30 ›› Issue (7) : 205-209.

论文

EPS混凝土动态力学性能研究

胡俊1,2; 巫绪涛3; 胡时胜1

作者信息 +

EXPERIMENTAL RESEARCH OF DYNAMIC MECHANICAL BEHAVIORS OF EPS CONCRETE

HU Jun1,2; WU Xu-tao3; HU Shi-sheng1

Author information +

文章历史 +

摘要

借助霍普金森杆（SHPB）对不同粒径、不同含量的EPS混凝土的动态性能进行了
研究。EPS混凝土具有明显的率效应；EPS混凝土在低应变率下表现出明显的三个不同的阶
段：弹性区、平台区和致密区，随应变率的增加，这一特性逐渐消失；对于同样体积含量、
粒径小的EPS混凝土表现出来的平台区更明显，在本文中分析了产生这种现象的物理机制；
在高体积含量的EPS混凝土中，粒子尺寸效应逐渐消失；随应变率的增加，峰值应力后留有长长地“尾巴”，主要是由于EPS颗粒的粘弹性特性。

Abstract

A split Hopkinson pressure bar(SHPB) was employed to study the dynamic characterteristics of EPS concrete for different size and containing of EPS beads . The results show that the characterteristics of EPS concrete is sensitive to strain rate under the loading conditions in this study.The stress-strain relationship of EPS concrete exhibited three different regions: linear-elasticity deformation due to bending of the cell walls；the plateau stress as result of plastic buckling of the cell walls and plastic collapse of the cells；and this behavior was gradually vanished as strain rates increased. The plasic characterteristics of small EPS bead sizes concrete for the same EPS volume fraction is more evident,in this study,the physical origin is identified for this phenomenon. the particle size effect becomes negligible for very high EPS volume fraction concretes. the post “peak-stress’’ behavior of EPS concretes is very evident with the increasing of strain-rate in that the EPS particle viscoelatic behavior.

导出引用

胡俊;巫绪涛;胡时胜. EPS混凝土动态力学性能研究[J]. 振动与冲击, 2011, 30(7): 205-209

HU Jun;WU Xu-tao;HU Shi-sheng. EXPERIMENTAL RESEARCH OF DYNAMIC MECHANICAL BEHAVIORS OF EPS CONCRETE[J]. Journal of Vibration and Shock, 2011, 30(7): 205-209