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| 1 | Rapid repair techniques for severely earthquake-damaged circular bridge piers with flexural failure mode显示文摘In this study, three rapid repair techniques are proposed to retrofit circular bridge piers that are severely damaged by the flexural failure mode in major earthquakes. The quasi-static tests on three 1:2.5 scaled circular pier specimens are conducted to evaluate the efficiency of the proposed repair techniques. For the purpose of rapid repair, the repair procedure for all the specimens is conducted within four days, and the behavior of the repaired specimens is evaluated and compared with the original ones. A finite element model is developed to predict the cyclic behavior of the repaired specimens and the numerical results are compared with the test data. It is found that all the repaired specimens exhibit similar or larger lateral strength and deformation capacity than the original ones. The initial lateral stiffness of all the repaired specimens is lower than that of the original ones, while they show a higher lateral stiffness at the later stage of the test. No noticeable difference is observed for the energy dissipation capacity between the original and repaired pier specimens. It is suggested that the repair technique using the early-strength concrete jacket confined by carbon fiber reinforced polymer(CFRP) sheets can be an optimal method for the rapid repair of severely earthquake-damaged circular bridge piers with flexural failure mode. | Sun Zhiguo Li Hongnan Bi Kaiming Si Bingjun Wang Dongsheng | 2017 | Earthquake Engineering and Engineering Vibration2017，16，2： | 8 |
| 2 | Simulation of multi-support depth-varying earthquake ground motions within heterogeneous onshore and offshore sites显示文摘This paper presents a novel approach to model and simulate the multi-support depth-varying seismic motions(MDSMs) within heterogeneous offshore and onshore sites.Based on 1 D wave propagation theory,the three-dimensional ground motion transfer functions on the surface or within an offshore or onshore site are derived by considering the effects of seawater and porous soils on the propagation of seismic P waves.Moreover,the depth-varying and spatial variation properties of seismic ground motions are considered in the ground motion simulation.Using the obtained transfer functions at any locations within a site,the offshore or onshore depth-varying seismic motions are stochastically simulated based on the spectral representation method(SRM).The traditional approaches for simulating spatially varying ground motions are improved and extended to generate MDSMs within multiple offshore and onshore sites.The simulation results show that the PSD functions and coherency losses of the generated MDSMs are compatible with respective target values,which fully validates the effectiveness of the proposed simulation method.The synthesized MDSMs can provide strong support for the precise seismic response prediction and performance-based design of both offshore and onshore large-span engineering structures. | Li Chao Li Hongnan Hao Hong Bi Kaiming Tian Li | 2018 | Earthquake Engineering and Engineering Vibration2018，17，3： | 6 |
| 3 | Dynamic amplification factors for a system with multiple-degrees-of-freedom显示文摘It is well-known that the responses of a structure are different when subjected to a static load or a sudden step load.The dynamic amplification factor(DAF),which is defined as the ratio of the amplitude of the vibratory response to the static response,is normally used to depict the dynamic effect.For a single-degree-of-freedom system(SDOF)subjected to a sudden dynamic load,the maximum value of DAF is 2.Many design guidelines therefore use 2 as an upper bound to consider the dynamic effect.For a civil engineering structure,which is normally a multiple-degrees-of-freedom(MDOF)system,the DAF may exceed 2 in certain circumstances.The adoption of 2 as the upper bond as suggested by the design guidelines therefore may lead to unsafe structural design.Very limited studies systematically investigate the DAF of a MDOF sysCorrespondence to:Bi Kaiming,Centre for Infrastructure Monitoring and Protection,School of Civil and Mechanical Engineering,Curtin University,Kent Street,Bentley WA 6102,Australia Tel:(+61)892665139 E-mail:kaiming.bi@curtin.edu.autem.This study theoretically investigates the DAF of a MDOF system when it is subjected to a step load based on the fundamental theory of structural dynamics.The condition on which the DAF may exceed 2 is defined.Two numerical examples and one experimental study of a cable-stayed bridge subjected to sudden cable loss are presented to illustrate the problem. | Zhang Chao Hao Hong Bi Kaiming Yan Xueyuan | 2020 | Earthquake Engineering and Engineering Vibration2020，19，2： | 3 |
| 4 | Modeling and simulation of spatially varying earthquake ground motions at sites with varying conditions 显示文摘 | BI Kaiming HAO Hong | 2011 | Probabilistic Engineering Mechanics2011，29，1： | 1 |
| 5 | Modelling and simulation of spatially varying earthquake ground motions at sites with varying conditions 显示文摘 | BI Kaiming HAO H | 2012 | Probabilistic Engineering Mechanics2012，29，： | 1 |
| 6 | Experimental investigation of spatially varying effect of ground motions on bridge pounding 显示文摘 | Li Bo BI Kaiming CHOUW N | 2012 | Earthquake Engineering & Structural Dynamics2012，41，14： | 1 |
| 7 | Modelling and simulation of spatially varying earthquake ground motions at sites with varying conditions显示文摘 | Kaiming Bi Hong Hao | 2012 | Probabilistic Engineering Mechanics2012，29，： | 1 |
| 8 | 基于Rayleigh阻尼模型的层间隔震结构上下部选择显示文摘建立了层间隔震结构的多质点系简化模型及结构动力方程,采用Newmark时程分析法,利用MTALAB对层间隔震结构上下部结构采用Rayleigh阻尼模型时的不同参数取值方法进行研究.结果表明:采用不同振型阻尼比时,层间变形差异较小,但加速度响应特别是下部结构的加速度响应差异较大,取振型阻尼比ξ数值为1%时计算偏于安全;采用不同振型频率时,第2阶和第3阶2种情况的层间变形和加速度响应差别较小,取第3阶的情况下地震响应要大于取第2阶的情况,在实际工程中按第3阶取值时计算偏于安全;采用刚度相关型和Rayleigh型2种情况的层间变形和加速度响应差别较小,采用质量相关型加速度地震响应较大,在实际工程中采用质量相关型计算时偏于安全. | 刘德稳 招继炳 盛冬发 周旺旺 Kaiming Bi | 2022 | 湖南科技大学学报(自然科学版)2022，37，3： | 1 |
| 9 | Enhanced trimeric ACE2 exhibits potent prophylactic and therapeutic efficacy against the SARS-CoV-2 Delta and Omicron variants in vivo显示文摘Dear Editor,The outbreak of coronavirus disease 2019(COVID-19)has resulted in a severe global pandemic that has lasted for more than two years.1 Several vaccines were developed at an unprecedented speed to protect billions of people.2 Many monoclonal antibodies have also been discovered,several of which are in the clinical stages.3 However,limited vaccine availability and vaccine hesitancy compromise the impact of vaccines.The continuous evolution of SARS-CoV-2 has also resulted in many variants that can escape immunity,reducing the effects of vaccines and antibodies.4 With more than 30 mutations in the spike protein,the Omicron variant escapes the majority of existing antibodies and extensively evades vaccine-induced immunity.5,6 Thus,therapeutics that are broadly effective against current and future emerging SARS-CoV-2 variants are still highly desirable. | Mengjiao Li Zi-Wei Ye Kaiming Tang Liang Guo Wenwen Bi Yuyuan Zhang Yan-dong Tang Guoguang Rong Mohamad Sawan Xin Yin Ren Sun Shuofeng Yuan Bobo Dang | 2022 | Cell Research2022，32，6： | 1 |
| 10 | Required separation distance between decks and at abutments of a bridge crossing a canyon site to avoid seismic pounding 显示文摘 | Kaiming Bi Hong Hao | 2010 | Earthquake Engineering & Structure Dynamics2010，39，3： | 1 |
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