混凝土与木材受压动力性能试验分析

为探究普通混凝土与木材受应变率影响的动力性能,设置五种不同加载应变率,通过液压伺服试验机得到两种材料不同加载工况下的应力-应变关系和破坏形态。通过应力-应变曲线提取峰值应力、峰值应变与弹性模量特征值,对比分析两种材料动力性能。研究结果表明:普通混凝土与木材均存在动力率的相关性,从破坏形态分析两种材料受动力影响破坏机理基本相同;普通混凝土与木材峰值应力和弹性模量均随着应变率的提高而提高,但木材受动力率影响更为明显,同时木材存在的稳定强度也随着应变率的提高而随之提高。两种材料峰值应变与应变率关系相对离散,木材即与混凝土材料同样存在离散性与随机性特征。

Experimental Study and Analysis on Compressive Performance of Concrete and Wood

In order to study the dynamic performance of ordinary concrete and wood subjected to strain rate, five different strain rates were set. The stress-strain relationship and failure modes of the two materials under different working conditions were obtained by hydraulic servo testing machine. The stress-strain curve Comparison of peak stress, peak strain and eigenvalue of elastic modulus. The results show that the correlation between the ordinary concrete and the wood is the same, and the damage mechanism of the two materials is basically the same from the failure mode analysis. The peak stress and elastic modulus of the ordinary concrete and wood are improved with the increase of the strain rate, but the stability of wood is more obvious, and the stability strength of wood also increases with the increase of strain rate. The relationship between the peak strain and strain rate of the two materials is relatively discrete, and the wood is the same as the concrete and randomness.