Study of Behavior and Measurement of Seismic Resistant Connections in Light Structural Frame Out of Aspen

Document Type : Research Paper

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Abstract

Earthquake is the major Natural disaster in Iran which once a while causes widespread death and financial losses. Constructional system and materials used in them, most often accelerate these damages, so these are considered principal reasons of the events. Countries that have regions of high seismicity, conducted research on constructional systems, materials, and methods of improving their resistance to earthquake. These research efforts have found simple solution of the problem in wood and its proper combinations with other constructional materials. In this research, regarding such target, two subjects were studied. A model of light framed one story single-family residential house in Iran was constructed to determine its dynamical behavior. The model was constructed in one- third scale of a unit with 54 square meters in base. Foundation anchorage in model was made by metal angle pieces, which were bolted to lower plank. These types of connectors could easily be fabricated in metal working shops in Iran. The rest of joints in model were made with bolts and common nails. To see the behavior of the model, its natural frequency, acceleration at different points, lateral movements (displacement), and also response of joints to tensile and compressive forces (developed due to lateral dynamical loading on a shaking table) were measured and analyzed. Results have shown that with respect to Fast Fourier Transformation spectra, ratio of maximum acceleration in roof to bottom of model, in sinusoidal acceleration test, the natural frequency of model is ten HZ (fn = 10 Hz), since 10 Hz frequency has the highest amplitude. This result had contingency with data of sinusoidal acceleration records with 10 HZ frequency and 0.64 g as well. Therefore, stiffness of model structure would be 78,250 Kg/cm. In addition, results of several sinusoidal acceleration tests for determining delay damping, has shown on the average 0.039 for this quantity. Brief results of sinusoidal acceleration test, sweeping frequency and time history of Kobe and Tabas earthquake have shown that maximum displacements (lateral movement due to dynamic loading) are related to this acceleration with 8 HZ frequency and 1.18 g. This displacement in model has been measured 0.76 mm, which is lower than allowable limit in IBC code (1% of story high, that is, 30 mm for a 3 m high). Including scale coefficient of constructed model, this figure would be 5.76 mm. But for force, it could be considered that highest tensile and compressive force would occur with 10 HZ frequency and 0.85g test. The cause is resonant phenomena in this frequency. Therefore, in resonant phenomena maximum force is applied to joints and in this case, each joint would be under load of 30% of building’s weight. Therefore, well-installed joint can considerably prevent death and financial damages. financial losses. Constructional system and materials used in them, most often accelerate these damages, so these are considered principal reasons of the events.

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References

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