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September 2014 - June 2017
Publications
Publications (59)
Here, a seismic-response analysis model was proposed for evaluating the nonlinear seismic response of a pile-supported bridge pier under frozen and thawed soil conditions. The effect of a seasonally frozen soil layer on the seismic vulnerability of a pile-supported bridge pier was evaluated based on reliability theory. Although the frozen soil laye...
The presence of frozen soil layers leads to stratification in soil stiffness, thereby influencing the dynamic response of pile foundations in seasonally frozen soil regions. This study investigated the dynamic response of pile-soil interaction (PSI) systems in such regions. A reduced-scale (1=10) model of a pile group with an elevated cap in railwa...
Global warming is accelerating the permafrost degradation along the Qinghai-Tibet Railway (QTR), causing the surface deformation (SD) of the railway subgrade. Especially in the Salt Lake to Wuli section of the QTR, the permafrost is widely distributed, and the SD has been the most serious. However, the spatio-temporal characteristics and mechanism...
In this article, a nonlinear static analysis model of a bridge pile foundation is established using numerical simulation, and the correctness of the model is verified via experiments. Then, the damage characteristics and mechanical behaviors of bridge pile foundations in cold regions under lateral loads are investigated based on the validated analy...
In order to study the effect of permafrost on the seismic performance of bridge piers with pile foundations, a three-dimensional finite element model considering the effect of frozen soil was firstly established. Then the effects of unfrozen soil, seasonal frozen soil and permafrost on the seismic performance of bridge piers with pile foundations w...
High-rise pile cap foundations play a crucial role in bridge engineering within permafrost regions. This study aims to investigate the seismic response of bridge pile foundations with high-rise caps during both cold and warm seasons. Initially, the existing dynamic analysis model of pile-soil interaction is enhanced. Subsequently, a dynamic analysi...
This paper investigates the seismic response of curved beam bridges equipped with friction pendulum isolation bearings through nonlinear time history analysis. Various influencing factors are considered, including different bearing schemes, friction coefficients, and slide radii of the friction pendulum isolation bearings. The results demonstrate t...
To study the effect of temperature on the seismic performance of a prestressed reinforced concrete (PC) continuous girder bridge with laminated rubber bearings (LRBs), a two-linked continuous bridge was used as the background to consider the effect of extreme temperature on the properties of LRBs and pier concrete. First, the properties of concrete...
It is necessary to understand the site seismic response for seismic design and post-earthquake damage assessment of structures in seismically active regions. In cold regions, the presence of layered frozen soil not only affects the ground motion characteristics but also influences the seismic response of structures on these sites. This study aims t...
Seasonal freezing and thawing of the active layer in permafrost can significantly alter the seismic response of the free field. In this study, a specific laminar shear model box with a soil-freezing system was designed, and shaking table tests of free fields under different soil-freezing conditions were conducted for ground motions with different i...
Frozen soils are widely distributed in the seismically active regions of northwest China. Under the background of global warming, the study of the dynamic characteristics of frozen soil is very significant for the sustainable development of engineering in cold regions. In this study, the silty clay in the Lanzhou area of northwest China is selected...
A R T I C L E I N F O Keywords: Small-and medium-span girder bridges Double-column piers Cox hazard model Survival analysis Fragility A B S T R A C T Fragility analyses have undoubtedly been critical steps in the seismic risk assessment of highway bridges, and even in transportation networks. In view of the shortcomings of the previous fragility an...
Frost heave induces deformation and damage to various facilities in cold regions and on artificially frozen ground. A convenient and quick way to assess frost susceptibility is favorable to deal with frost heave. This study introduced an easy freezing ring test, in which a short cylindrical soil sample is frozen from the outmost boundary to its cen...
Replaceable components are beneficial to functionality rapid restoration of structures after earthquakes, which is a good option for seismic design of resilient bridges. In this study, a lattice-type bridge pier with replaceable connection component was proposed for railway bridges. Large initial stiffness was provided by using steel truss connecti...
For pile group foundations used in cold regions with frequent seismic activity, the pile cap embedment conditions and freezing-thawing effect of soil layer deserve concerns in seismic design. In this study, quasi-static tests are carried out to investigate seismic failure characteristics of the bridge pile foundation with elevated and embedded caps...
The active layer in permafrost region is inevitably subjected to seasonal freezing-thawing actions. The soil freezing and thawing can change boundary conditions of the bridge pile foundation in permafrost region, which will influence the seismic responses of the bridge. In this study, quasi-static tests were carried out by using two 1/8 scaled mode...
Pile foundation with elevated cap is always applied for railway bridges in permafrost region to minimize the thermal disturbance to vulnerable permafrost. Permafrost can influence the failure characteristics of the pile foundation under earthquakes and complicate the seismic performance evaluation of railway bridges with pile foundations in seismic...
A superior seismic strengthening technology should be not only secure and reliable, but also economical and feasible for the widespread structures. In China, the gravity pier with low longitudinal steel ratio has been widely used in railway bridges, and most of them have insufficient seismic performance due to limited technological level in the ear...
Railway bridge pier with large cross-section will vibrate significantly during strong earthquake events. Sacrificial components can be used to improve the lateral stiffness and control the initial uplift of the self-centering pier during earthquakes. This study investigated the seismic isolation mechanism and behavior of a self-centering railway br...
Digging well foundation has been widely used in railway bridges due to its good economy and reliability. In other instances, bridges with digging well foundation still have damage risks during earthquakes. In this study, a new type of digging well foundation with prefabricated roots was proposed to reduce earthquake damage of these bridges. Quasi s...
With climate warming, widespread permafrost degradation is found worldwide in recent years. For permafrost regions located in earthquake belts, i.e. the Qinghai-Tibet Plateau permafrost region in China, permafrost degradation effect on seismic performance of the bridge pile foundation is worthy of research. In this study, a pile-soil interaction mo...
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Here, aiming at situations of only one main crack being formed at the bottom of a railway gravity bridge pier with low reinforcement, concrete at the bottom of the pier being not obviously crushed without plastic hinge area formed, and existing obvious rocking phenomenon under dynamic action, a simplified aseismic calculation model for this kind of...
Ground seasonal freezing and thawing in cold regions can alter boundary conditions of bridge pile foundations and influence their seismic behaviors. This article describes a test apparatus with a custom-designed cooling system for investigating the seismic behavior of pile foundations in seasonally frozen ground. Two 1/8-scale models of a reinforce...
Replaceable components can be used to avoid severe damage of bridge pier in earthquake or to achieve rapid replacement if damaged after earthquake. This study proposed a novel railway bridge pier with concrete columns as main component and steel truss connection system as replaceable component. Shaking table tests with 1/10-scaled models were carri...
Earthquakes cause severe damages to bridge structures, and rocking isolation of piers has become a superior option
for the seismic protection of bridges during earthquakes. A seismic isolation method with free rocking mode is proposed for
railway bridge piers with medium height. Experimental and numerical analysis are conducted to evaluate the seis...
Digging well foundation has been widely used in railway bridges due to its good economy and reliability. In other
instances, bridges with digging well foundation still have damage risks during earthquakes. However, there is still a lack of
knowledge of lateral behavior of digging well foundation considering the soil-foundation interaction. In this...
The pile group foundation is widely used for gravity pier of high-speed railway bridges in China. If a moderate or strong earthquake occurs, the pile-surrounding soil will exhibit obvious nonlinearity and significant pile group effect. In this study, an improved pushover analysis model for the pile group foundation with consideration of pile group...
Precast concrete elements in accelerated bridge construction (ABC) extends from superstructure to substructure, precast pile foundation has proven a benefit for regions with fragile ecological environment and adverse geological condition. There is still a lack of knowledge of the seismic behavior and performance of the precast pile foundation. In t...
In this study, the variations of the temperatures and volumetric unfrozen water contents for two fine-grained soils (i.e., silty clay and silt) with high degrees of saturation during a freezing–thawing process were experimentally studied. Experimental results show that for the two soils, the supercooling phenomenon only happens in the early stage o...
Pile foundation is widely used for railway bridges in loess throughout northwestern China. Modeling of the loess–pile interaction is an essential part for seismic analysis of bridge with pile foundation at seismically active regions. A quasi-static test is carried out to investigate the hysteretic behaviors of pile foundation in collapsible loess....
Evaluation of calculation models for the unfrozen water content of freezing soil is very important for numerical simulations. Based on the published 250 laboratory data and around 5 years field observed data, this paper evaluated the five widely used unfrozen water content models, i.e., the Zhang et al. (2017a) model, the Anderson and Tice (1972) m...
In this study, a series of freezing experiments were carried out to investigate the changes of volumetric unfrozen water contents in freezing soils. The experimental results show that the soil type and the initial volumetric water content have significant effect on the freezing point and volumetric unfrozen water content of freezing soils. On the b...
Seismic strengthening is essential for existing bridge piers which are deficient to resist the earthquake. The concrete and CFRP jackets with a bottom-anchoring method are used to strengthen railway bridge piers with low reinforcement ratio. Quasi-static tests of scaled down model piers are performed to evaluate the seismic performance of the origi...
The thermal conductivity of soils is a key factor in calculating soil heat transfer and analyzing temperature fields of geotechnical engineering in cold regions. We measured the thermal conductivity of a silty clay by a QuickLine-30 Thermal Properties Analyzer during a freezing-thawing process, and analyzed the variation of the thermal conductivity...
In the study, a matrix model, based on the combinations of 1 thermal conductivity model for saturated soils (λsat), 4 thermal conductivity models for dried soils (λdry) and 4 Kersten number models for soils (Ke), was proposed to calculate the thermal conductivity of soils. 16 calculation models were included in the matrix. The matrix could be used...
The seismic isolation techniques of controlled rocking bridge pier is presented to improve seismic performance of the railway bridge in the earthquake-prone zone. In order to limit the lateral movement and overturning under the rarely strong earthquake, the inhibiting steel bar and prestressing tendon are used in the rocking bridge piers. The seism...
Freezing–thawing deformation is a key factor in determining damages for engineering structures in cold regions. Based on the laboratory experiments, the characteristics of the freezing–thawing deformation were analyzed, and the variation of the matric suction was discussed. The results show that for each freeze–thaw cycle, the freezing–thawing defo...
Frost heave is the primary cause of frost damage in cold regions. For frost-susceptible soils, water migration induced by a temperature gradient is a key factor in determining the frost heave of the soils with a water supply during the freezing process. This study looked at the effect of temperature gradients on frost heave through a series of one-...
Dry bridges have been widely applied in the Qinghai-Tibet Railway (QTR) to minimize the thermal disturbance of engineering to the permafrost. However, because the Qinghai-Tibet Plateau is an area with a high potential occurrence of earthquakes, seismic action can easily destroy the dry bridges. Therefore, a three-dimensional numerical model, with c...
Frost heave behavior during soil freezing process is an important issue of concern in cold regions, which is influenced by the hydro-thermal characteristics including the freezing point and water migration. The frost heave is caused by the freeze of water from different sources, i.e. pristine water, migrated water or both; however, it is difficult...
The unfrozen water content is a key factor controlling the moisture migration and causing the frost heave or thaw settlement during freezing and thawing processes. The freezing temperature is an important index to judge whether the soils are in a frozen state or not. The characteristics of the unfrozen water content and the freezing temperature and...
In this study, a large-scale one-directional freezing experiment with water supply was performed to investigate the water–heat migration and frost-heave behavior of the saturated silty clay. The results indicate that the temperature gradient is larger in the frozen zone than that in the unfrozen zone because of the heat release of the supplied wate...
Civil engineering buildings are often damaged by frost heave of ground soils in cold regions. The hydro-thermal behavior is a key factor in determining frost heave of soils during freezing process. Moreover, the frost heave is also strongly affected by overburden pressure and external water source. Here, a series of one-directional freezing experim...
The crushed-rock interlayer embankment with ventilation ducts has been advocated to stabilize the permafrost stratum under expressways in permafrost regions. This embankment must render better cooling effect than railway embankments because the expressway surface is wider and hotter. To this purpose, the walls of the ventilation ducts need to be pe...
Numerous engineering projects have been completed on the Qinghai-Tibet Plateau, and with continued economic growth, additional important engineering projects are being planned. Major transportation construction is largely restricted to the Qinghai-Tibet Engineering Corridor, which is as narrow as a few hundred meters in some places. In this narrow...
