针对钢-混组合梁桥的行车振动问题,设计了一种碰撞调谐质量阻尼器(pounding tuned mass dampers, PTMD)装置,进行了基于PTMD的钢-混组合梁减振效应试验研究和数值分析研究。设计并制作了钢-混组合梁试验模型和PTMD装置,研究了PTMD装置...针对钢-混组合梁桥的行车振动问题,设计了一种碰撞调谐质量阻尼器(pounding tuned mass dampers, PTMD)装置,进行了基于PTMD的钢-混组合梁减振效应试验研究和数值分析研究。设计并制作了钢-混组合梁试验模型和PTMD装置,研究了PTMD装置的减振效果并进行PTMD装置的参数讨论。结果表明,该PTMD装置对钢-混组合梁的振动有明显的抑制效果,在振动响应较大时能够取得更好的减振效果,其最佳质量比为2%,最佳碰撞间隙为4 mm,在试验梁上同时安装3个PTMD更为合理。以某高速公路线路上的双主梁钢-混组合梁桥为研究背景,建立了车-桥-PTMD耦合系统模型,计算并对比双主梁钢-混组合梁桥在移动车辆荷载作用下无减振装置和应用PTMD装置下的动力响应,验证了PTMD装置在实际应用中的减振效果。展开更多
In order to study the mechanism of seismic isolation、seismic absorption and the limiting strength of Dougong under the seismic vertical action in Chinese timber structure, by following the building regulation of Ying...In order to study the mechanism of seismic isolation、seismic absorption and the limiting strength of Dougong under the seismic vertical action in Chinese timber structure, by following the building regulation of Ying Zao Fa Shi published in Song Dynasty (960A.D. —1279 A.D.) in China history, the three Dougong models with the scale of 1/3.52 of the prototype structure are made, and on which the limiting strength experiments are carried out. The experimental phenomenon is observed, and the relevant P-△ curves are drawn simultaneously. The tested results show that :under the vertical load,(1) the mechanical behaviors of Dougong can be regarded as linear-elastic mechanic model with varied modulus of elasticity, and expressed with SDOF system; (2) the first cause of the destruction of Dougong is the break of the midmost of Huagong;(3) Dougong plays a very important role in reducing obviously seismic responses of the Chinese timber structure due to the sdismic vertical transmissibility is approximate to 0.019;and ⑷ under the normal condition, the material strain and stress of Dougong are very small, and no more than 1/7 of the limiting, so the abundance of the material strength is quite large. This ensures that many Chinese ancient wooden structures have survived many violent earthquakes and stood over one thousand years.展开更多
文摘In order to study the mechanism of seismic isolation、seismic absorption and the limiting strength of Dougong under the seismic vertical action in Chinese timber structure, by following the building regulation of Ying Zao Fa Shi published in Song Dynasty (960A.D. —1279 A.D.) in China history, the three Dougong models with the scale of 1/3.52 of the prototype structure are made, and on which the limiting strength experiments are carried out. The experimental phenomenon is observed, and the relevant P-△ curves are drawn simultaneously. The tested results show that :under the vertical load,(1) the mechanical behaviors of Dougong can be regarded as linear-elastic mechanic model with varied modulus of elasticity, and expressed with SDOF system; (2) the first cause of the destruction of Dougong is the break of the midmost of Huagong;(3) Dougong plays a very important role in reducing obviously seismic responses of the Chinese timber structure due to the sdismic vertical transmissibility is approximate to 0.019;and ⑷ under the normal condition, the material strain and stress of Dougong are very small, and no more than 1/7 of the limiting, so the abundance of the material strength is quite large. This ensures that many Chinese ancient wooden structures have survived many violent earthquakes and stood over one thousand years.
