Experimental assessment of damping factors in concrete housing walls

Ingeniería e Investigación

Giovanni González¹  Julián Carrillo¹  Sergio M. Alcocer² 

[1] Universidad Militar Nueva Granada;Universidad Nacional Autónoma de México;

关键词: concrete wall;    vibration period;    damping factor;    dynamic transfer function;    shake table test;   

DOI  :  

来源: DOAJ

【 摘 要 】

Thin walls having low concrete strength, minimum web steel ratios and web shear reinforcement made of welded wire meshes are commonly used in low-rise concrete housing. The damping factor commonly used for code-based dynamic analysis was evaluated based on seismic response measured during shake table tests of six low-rise concrete walls. The variables studied were the type of concrete (normal and lightweight), the web steel shear ratio (0.125% and 0.25%), the type of web shear reinforcement (deformed bars and welded wire meshes) and the effect of openings (doors and windows). Dynamic properties were evaluated considering the advantages of frequency-domain system identification, using the dynamic transfer function amplitude fitting method. The effect of failure mode on damping factor is discussed. An equation for estimating damping associated with a particular vibration period value is also proposed. It was observed that a 5% damping factor (assumed for dynamic analysis of concrete housing in the range of lineal elastic behaviour) was consistent with the values measured here.

【 授权许可】

Unknown