Experimental Quantification on the Residual Seismic Capacity of Damaged RC Column Members

Abstract

To quantify the post-earthquake residual seismic capacity of reinforced concrete (RC) column members, experimental data for 6 column specimens with flexural, flexural-shear and shear failure modes are used to derive residual seismic capacity of damaged RC column members for specified damage states in this work. Besides of the experiment data, some related researches are also investigated to suggest the reduction factors of strength, stiffness and energy dissipation capacity for damaged RC column members, respectively. According to the damage states of RC columns, their corresponding seismic reduction factors are suggested herein. Taking an RC column with the flexural-shear failure for an example, its reductions factors of strength, stiffness and energy dissipation capacity are 0.5, 0.6 and 0.1, respectively. This work also proposes the seismic performance assessment method for the residual seismic performance of earthquake-damaged RC buildings. In the case study, this work selects one actual earthquake-damaged school building to demonstrate the post-earthquake assessment of seismic performance for a damaged RC building.

Дослідження Пошкоджених Залізобетонних Елементів, Основні Методи Їх Відновлення Та Підсилення

“…Їх використання поза межам експлуатаційного проектованого терміну часто визначається ступенем їх фактичного зносу, визначеного за результатами натурних обстежень і оцінки фактичного напружено-деформованого стану елементів. В таких ситуаціях надзвичайно важливим постає питання моделювання поведінки залізобетонної конструкції в умовах негативних силових і несилових впливів, прогнозування розвитку пошкоджень і зміни напружено-деформованого стану елемента, що було досліджено в значній кількості наукових досліджень в цій галузі ( [2,3,4]).…”

“…Всі вище перераховані і багато інших факторів детально досліджуються в наукових роботах різних країн ( [3,4,5,6]).…”

Application of Post-Embedded Piezoceramic Sensors for Force Detection on RC Columns under Seismic Loading

“…Most such uses to column members under dynamic loading have involved the monitoring of structural health using piezoelectric-based sensors. Chiu et al [7] used pre-embedded and post-embedded piezoceramic transducers to perform crackbased damage quantification in full-size high-strength RC column specimens under cyclic loading. They found that pre-embedded piezoceramic transducers were more sensitive to maximum residual crack width than the post-embedded piezoceramic transducers, especially for shear cracks.…”

“…The values of the damage indices that obtained using such sensors were more strongly correlated with crack width. Chiu et al [7] introduced a normalized damage index, which they referred to as the "crack damage index", and suggested a limiting value of this damage index at each damage level. Their results revealed that the proposed piezoceramic transducer has potential for use in the SHM of an RC column.…”

“…Along with the maximum crack width at a specified peak deformation, its corresponding residual crack width at an applied loading of zero is recorded. The crack type and measurement position are determined as described by Chiu et al [7].…”