Seismic response and reliability index of RC weak story buildings on soft soils of Mexico city

Jara, José; García-Calzada, C.; Olmos, B.A.; Martínez, Guillermo

doi:10.1016/j.jobe.2022.104199

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…The roof of the tunnel is composed of rock layers of different strengths. If special factors such as primary fractures and faults are not considered, the roof rock collapse of the goaf has the following characteristics due to the alternating changes of strong and weak rock layers [6]. Hard rock layers have strong anti-interference ability and can form large, unbreakable suspended roofs.…”

Section: Analysis Of Overlying Rock Collapse Processmentioning

confidence: 99%

Seismic performance of soft rock tunnel under composite support conditions

Wu,

2024

J. vibroeng.

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In order to effectively improve the seismic and impact resistance performance of soft rock tunnels, a composite support method was proposed and validated in the paper. The UDEC (Universal Distinct Element Code) model of soft rock layers was established, and the movement and subsidence characteristics of the roof and floor of the rock layers under impact loads was simulated and calculated. As a result, a composite support scheme with good cushioning performance was proposed. The top and sides of the tunnel were supported by a combination of anchor rods of different lengths and metal mesh, reinforced by steel beams and vibration absorbing filler around. The anchor rod was designed as a segmented loading structure, and can be set to different preloading forces based on the internal deformation of the rock layer. The dynamic response testing scheme was designed, and the results indicate that the segmented loading anchor rod has a significant buffering effect on the response to impact load, and can provide reasonable tension feedback at different stages. Research has found that when the water cement ratio is 0.5-1.5, the curing efficiency and strength are both higher. In order to compare the seismic performance of composite support and traditional constant resistance anchor rod support, local blasting experiments were conducted. Based on a blasting vibration tester, a data detection and transmission system were designed to obtain the vibration speed of the tunnel roof during the vibration process. The research results show that composite support can reduce the maximum vibration by more than 40 %, stabilize the fragmentation coefficient at 1.38, and have a very significant vibration reduction effect.

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Section: Analysis Of Overlying Rock Collapse Processmentioning

confidence: 99%

Seismic performance of soft rock tunnel under composite support conditions

Wu,

2024

J. vibroeng.

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“…There are lots of researches on the seismic performance of building structures, but so far, most research concentrates on the causes of vibration [3], excavation of weak structures, and seismic performance tests through experiments and simulation analysis methods. The representative ones are as follows: Jara [4] explained the collapse of weak story buildings observed during the earthquake, evaluated the seismic response, and determines the reliability indices of a typology of buildings with flexible ground floors; Hafner [5] performed a non-linear static pushover analysis, examined possible failure mechanisms and explained a conclusion process of the building's usability; Mohammed [6] constructed three scaled models of steel skeleton structures with variable embedded depths, and the finite element technique is carried out for scaled and real models. Miah [7] proposed a building vibration reduction scheme with high anti-damping characteristics, of which vibration isolation effect is good, but the cost is high and the construction is relatively difficult.…”

Section: Introductionmentioning

confidence: 99%

Analysis and optimization of seismic performance of high-rise residential building

Wang¹,

Chang²,

Kong³

et al. 2022

J. vibroeng.

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In order to improve the seismic performance of high-rise buildings, a friction damper installation scheme was proposed in the paper. Through numerical simulation and experimental testing, the vibration reduction effect was compared and verified. Herringbone structure was applied to install friction damper in the bearing wall. Based on this vibration reduction scheme, the finite element model of high-rise building was established, and the influence of damper on the modal characteristics of building frame was analyzed. It can be known that the damper has little influence on the natural frequency, but has a great influence on the amplitude range of the excitation response. In the finite element model, two kinds of seismic waves were applied, the strength and dynamic response was simulated and calculated, and the maximum deformation and stress results were obtained. Compared with the initial model, it can be known that the more intense the vibration is, the more obvious the damping effect of the damper is. A seismic excitation simulation system based on acceleration sensor detection is designed and applied to the wall vibration test. The results show that the maximum vibration acceleration of the measured point is reduced by 26.3 % by the damper, and the stable seismic effect can still be maintained during the impact of extension. Compared with the traditional hardness and volume reinforcement scheme, the friction damper can reduce the production cost and improve the adaptability to seismic wave excitation, which provides an important basis for seismic research in other fields.

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