Seismic Damage Analyses of Staircases in RC Frame Structures

Jiang, Huan Jun; Gao, Hai Long; Wang, Bin

doi:10.4028/www.scientific.net/amr.446-449.2326

Cited by 9 publications

(9 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In previous earthquakes, stairs and their connected frame structure units were prone to serious earthquake damage [1][2][3] . As an earthquake-prone country, China attaches great importance to the influence of stair members on the stiffness of the main structure in structural design.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the New Type of Connecting Nodes of Prefabricated Stairs Using Flexible Grouting Material

Zhang,

Huo,

Liu

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

In recent years, prefabricated buildings have been developing positively in China. Prefabricated concrete stairs are widely used in prefabricated concrete buildings because of their quick construction, convenient handling, reduced cost, and premium appearance. They also have promising application potential in cast-in-place concrete structures and steel buildings. The stairs are important escape routes during earthquakes and play the role of “safety islands.” Therefore, the study on the seismic performance of connecting nodes of prefabricated concrete stairs is significant. For a new flexible-hinge connecting node of the prefabricated stairs with flexible grouting material (FGM), the low-frequency cyclic loading test is carried out in this paper to study the stress performance of the end nodes of the stairs under in-plane and out-of-plane low-frequency cyclic loading. The results show that the new flexible-hinge connecting nodes of the prefabricated concrete stairs have moderate bearing capacity and stiffness, which can mitigate the effect of diagonal bracing under small and medium earthquakes and dissipate energy to a certain extent.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Study on the New Type of Connecting Nodes of Prefabricated Stairs Using Flexible Grouting Material

Zhang,

Huo,

Liu

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…Feng et al [13] and Zhao et al [14] proposed a design to separate the staircase from the overall structure and suggested cutting off the transfer path of horizontal load in the staircase. In addition, Jiang et al [15] put forward detailed requirements to separate the staircase from the overall structure, and the sliding support installed in the staircase was also proposed. Subsequently, shaking table tests of a reinforced concrete stair with sliding bearing were conducted by Zhao et al [16].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Seismic Performance of RC Frame Buildings with Rubber Isolation Bearing Installed in Staircases

Bai

Liang

et al. 2023

Buildings

View full text Add to dashboard Cite

A rubber isolation bearing installed in a staircase (RBS) was proposed to mitigate seismic damages to the component of staircases and improve their seismic performance. A series of quasi-static tests performed with respect to the horizontal and vertical mechanical properties of RBS as well as the numerical modelling were verified with experimental results. Next, the finite element models of typical types of reinforced concrete frames (without stairs, with cast-in-place reinforced concrete stairs, and with RBS stairs) were established. The modal dynamic and non-linear elasto-plastic analyses of system-level building models were herein conducted, respectively. The effect of the RBS on the dynamic response of the whole structure and the mechanical performance of stair components was revealed. The analysis results indicated that the RBS provided the desired floor-to-floor relative drift and effectively isolate the seismic action from the stair flight. Therefore, the presence of RBS can effectively mitigate the influence of a staircase on the entire building’s structure, weaken the diagonal strut effect of flights, and reduce the inner forces of staircase components.

show abstract

“…For reinforced concrete (RC) frame structures, the infill wall failure (Crisafulli, 1997), staircase failure (Jiang et al, 2012), and beam-column joint failure (Cotsovos, 2013) normally occur under seismic loading conditions, of which the infill wall and staircase failures will not have too much impact on the integral frame structures. As the beam-column joints are of crucial importance in the inelastic response of the frame structures to transfer the inertia load from frame structures to foundations, the collapse of RC frame structures is mostly induced by beam-column joint failure.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis on seismic behavior of beam-column joint with different cement-based materials

Ding

Zhang

et al. 2022

Advances in Structural Engineering

View full text Add to dashboard Cite

Under cyclic loading conditions, the ductility of frame beam-column joints, which can be evaluated by the displacement ductility coefficient ( μ), is strongly affected by the axial load ratio ( n). Due to the high toughness of engineering cementitious composites (ECCs), the normal concrete can be replaced giving better joint ductility. However, the limit values of n for reinforced ECC (R-ECC) joints have not been clarified. Therefore, T- and cross-shaped reinforced concrete (RC) and R-ECC joint finite element models were established and analyzed under n values. The results indicated that the seismic performance of the joints, including μ, equivalent damping coefficient ( ξ eq), and secant stiffness ( K i) were strongly dependent on n. μ and ξ eq became inversely proportional to n when n was over 0.5. The RC and R-ECC joint ductile failure could occur when n was in the range of 0.3–0.7 and 0.3–0.9, respectively. The joint brittle failure occurred in RC and R-ECC joints when n was over 0.7 and 0.9, separately. Under the same n and load history, the maximum value of μ of R-ECC joints increased by 33.7% and 27.9% for T- and cross-shaped joints separately compared to that of RC joints. It is suggested that the n values for RC and R-ECC joints should not exceed 0.7 and 0.9, respectively.

show abstract

Seismic Damage Analyses of Staircases in RC Frame Structures

Cited by 9 publications

References 1 publication

Experimental Study on the New Type of Connecting Nodes of Prefabricated Stairs Using Flexible Grouting Material

Experimental Study on the New Type of Connecting Nodes of Prefabricated Stairs Using Flexible Grouting Material

Investigation on the Seismic Performance of RC Frame Buildings with Rubber Isolation Bearing Installed in Staircases

Numerical analysis on seismic behavior of beam-column joint with different cement-based materials

Contact Info

Product

Resources

About