EARTHQUAKE DAMAGE EVALUATION OF AN 8-STORY STEEL-REINFORCED CONCRETE BUILDING USING Sa-Sd CURVES

Abstract

A seismic performance curve shows the relationship between the representative displacement () and the equivalent base shear force coefficient () of a structure. The seismic capacity of a building can be assessed in a straightforward manner using a simple performance skeleton curve. In this study, earthquake response records were used to obtain curves for a steel-reinforced concrete (SRC) building and assess the changes in the seismic performance of the building that occur during an earthquake. This paper compares the seismic performance curves of an 8-story SRC building for 27 strong earthquakes that occurred in Japan between 1998 and 2012. The results demonstrate the practicability of using curves to evaluate the damage to real buildings using data collected during strong earthquakes.

Multi-scale Review for Possible Mechanisms of Natural Frequency Change of Reinforced Concrete Structures under an Ordinary Drying Condition

“…And 18% decrease in natural frequency of building after 7 years after construction was discovered. Li et al (2014) also use the data from the same system but the analysis is expanded to 14 years after construction, and 45% reduction of natural frequency was found including the damage during the Great East Japan Earthquake. It should be noted that all the earthquakes except for the Great East Japan Earthquake shows no change of stiffness during the earthquakes.…”

Evaluation of Soil Stiffness Using Performance Curves of an Eight-Story Steel-Reinforced Concrete Building With Embedded Spread Foundation

“…The superstructure of the measurement building (Figure 1 Figure 1 (b)) can be calculated using the method in the reference papers 7,8) .…”

“…where is the representative rocking angle, the calculation method was referred to the paper by Ligang LI et al 8) . The Step 1: Accumulate the earthquake response data of the building and extract the fundamental response using the WTT technique.…”

“…This method has been shown to be practically applicable to seismic performance evaluation of real buildings 8) . It is expected that the concept of the curve of the single-degree-of-freedom (SDOF) model can be used to evaluate soil performance (reflected by the curve of the foundation) in earthquakes.…”

Impact of Drying on Structural Performance of Reinforced Concrete Shear Walls

“…As Maruyama has pointed out, a decrease in the Young's modulus due to drying and drying shrinkage-induced cracks contribute to the stiffness reduction of the structure, which translates to a decline in the natural frequency. It is noteworthy that no stiffness change has been observed during small and medium earthquakes in 8 story steel-reinforced concrete (SRC) buildings (Li et al 2014). This study revealed that a gradual decrease in the natural frequency is caused not by the small and medium earthquakes but by the other factors.…”