循环荷载作用下不同配比EPS轻质混凝土阻尼比变化规律

Damping behavior of lightweight expanded polystyrene concrete under dynamic cyclic loading

通过对EPS颗粒体积分数为0%,20%,30%,40%的轻质混凝土施加5×10^4次频率为5Hz的循环动荷载进行循环动力试验,对测得的数据进行计算分析,得出不同配比的EPS轻质混凝土阻尼比的变化规律.通过测定经过动力循环试验的轻质混凝土的强度,研究轻质混凝土的耐久性能.结果显示,EPS含量越高,阻尼比越大;施加的荷载越大,阻尼比的变化越明显.经过5×10^4次循环动载试验后EPS轻质混凝土强度减少不明显,量化阻尼比规律和耐久性对EPS轻质混凝土在长期循环施工的实际工程中的使用具有重要的意义.

Cyclic loading tests with 50 000 times were conducted on the lightweight concrete（ LWC）with different EPS（ expanded polystyrene） volume contents of 0%,20%,30% and 40% at the frequency of 5 Hz. By the computational analysis of the experimental data,the damping change laws of LWC with different EPS ratios were obtained. After dynamic cyclic loading tests,the intensity of LWC was measured and then the durability of LWC was studied. The experimental results showthat the higher the inclusion content,the higher the damping ratio of the LWC. The larger the applying load,the more obvious the damping ratio changes. However,the strength of LWC has no evident decrease after loading tests of 50 000 times. The quantization of damping rules and the durability have practical significance in use of the LWC in some practical engineering for suffering long-term dynamic cyclic loading.