Upgrading of isolated bridges with space-bar energy-dissipation devices: Shaking table test

Abstract

The results of the experimental research program realized on a bridge model constructed by using the seismically isolated system upgraded with space-bar devices (USI-SB) are presented in the paper. The installed adaptable system for seismic protection of bridges utilizes double spherical rolling seismic bearings (DSRSB) as seismic isolators, while the qualitative improvement of seismic performances is achieved through the use of novel adjustable multi-directional space-bar energy dissipation (SB-ED) devices. The experimental program consisted of quasi-static testing of isolation and energy dissipation devices under the cyclic loading and extensive shaking-table testing of a large-scale bridge model with installed USI-SB system. For both types of devices, a very stable all-directional response during cycling tests, as well as the favorable hysteretic behavior of the energy dissipation devices along the entire range of applied large displacements were registered. In the dynamic testing, the system showed high seismic response modification performances needed for the efficient protection, exhibiting its large potential in the qualitative improvement of seismic performances of isolated bridges.

Comparative analysis of conventional and new seismically isolated structure

“…The extensive innovative and ample original analytical and experimental investigations discussed and used in this paper were performed during the past longer period [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], for the purpose of defining the real potential for practical application of the new HC-RMS-GOSEB system for efficient seismic protection of reinforced concrete and other structures in high rise construction.…”

“…Important technological advances and innovations have been created by the authors based on conducted long-term original analytical and experimental research within several international projects, [1], [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], focused on efficient mitigation of earthquake effects upon engineering structures. Our studies have been planned and realized considering the most recent analytical advances, [3] & [20], and suitable experimental modeling developments, [2], in this specific field.…”

The effects of the duration, intensity and magnitude of far-fault earthquakes on the seismic response of RC bridges retrofitted with seismic bearings

“…Extensive studies suggest that using seismic bearings and dampers leads to seismic retrofit of buildings and bridges (Xiang and Li 2016;Mansouri and Nazari 2017;Zhou and Tan 2018;Luo et al 2019;Kontoni and Farghaly 2019). Recently, studies on the effects of using seismic bearings and dampers indicated that these devices could reduce the seismic response of structures (Cho et al 2020;Hassan and Billah 2020;Cao et al 2020;Zheng et al 2020;Wei et al 2021;Xing et al 2021;Ristic et al 2021;Khedmatgozar Dolati et al 2021;Yuan et al 2021;Chen and Xiong 2022;Marnani et al 2022;Guo et al 2022).…”

The effects of the duration, intensity and magnitude of far-fault earthquakes in seismic retrofitting an RC bridge

“…One of the most effective solutions for bridges' seismic retro t is using energy dissipation equipment. Extensive studies suggest that energy dissipation devices lead to bridges' seismic retro t [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

“…One of the most effective solutions for bridges' seismic retro t is using energy dissipation equipment. Extensive studies suggest that energy dissipation devices lead to bridges' seismic retro t [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].Studies showed that earthquakes are divided into two groups of near and far fault earthquakes according to the distance of the earthquake recording station from the fault. Each group of earthquakes has speci c characteristics [18][19].…”