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学者姓名：赵衍刚
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Abstract ：
The compressive strength model of fibre-reinforced polymer (FRP) confined recycled aggregate concrete (RAC) is important in practical engineering designs. The existing research has showed that the compressive strength of FRP-confined RAC can be predicted by the models for FRP confined natural aggregate concrete (NAC). However the accuracy of existing compressive strength models for FRP-confined NAC vary greatly because of the unclear understanding of the confinement mechanisms. Previous research has shown that the axial stress of confined concrete tends to be path-dependent. In this study, a confining stress path-based compressive strength model of FRP-confined RAC is proposed based on theoretical analyses of the confining stress path of FRP-confined RAC. In the proposed model, an effect index is determined to express the influence of confining stress path on the compressive strength. The relationship between the effect index and confinement ratio and that between lateral stress dominant index and confinement ratio are obtained. The proposed model is verified by comparison with previous experimental test results and those predicted by existing representative models. It is found that the compressive strength of FRP-confined RAC is path-dependent for small confinement ratios (less than 0.43) and path-independent for large confinement ratios (larger than 0.43).
Keyword ：
FRP-confined recycled aggregate concrete FRP-confined recycled aggregate concrete Confining stress path Confining stress path Confinement ratio Confinement ratio Replacement ratio Replacement ratio
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| GB/T 7714 | Wang, Juan , Lin, Siqi , Zhao, Yan-Gang . Stress path-based compressive strength model of FRP-confined recycled aggregate concrete [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 440 . |
| MLA | Wang, Juan 等. "Stress path-based compressive strength model of FRP-confined recycled aggregate concrete" . | CONSTRUCTION AND BUILDING MATERIALS 440 (2024) . |
| APA | Wang, Juan , Lin, Siqi , Zhao, Yan-Gang . Stress path-based compressive strength model of FRP-confined recycled aggregate concrete . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 440 . |
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Abstract ：
In recent decades, the outcrossing rate method has gained popularity for structural time-dependent reliability assessments (TRA). Despite numerous efforts, developing a general analytical outcrossing rate method for a nonstationary non-Gaussian performance function to estimate the failure probability within the forecast time interval remains a significant challenge. This paper introduces an analytical outcrossing rate method for non-Gaussian cases, named the three-moments-based outcrossing rate (TMO) method. The outcrossing rate is formulated based on the third-moment outcrossing rate with no assumption of the correlation between the performance function and its derivative process, allowing for a comprehensive understanding of the performance characteristics of a structure. Following the development of the proposed outcrossing rate, a TRA methodology is established to evaluate the failure probability of the nonstationary non-Gaussian performance function. Notably, the TMO method only requires statistical moments of the nonstationary non-Gaussian performance function, which are easy to calculate, facilitating efficient implementation. Three numerical examples are presented to demonstrate the applicability, efficiency, and accuracy of the proposed TMO method. It can be concluded that the proposed TMO method provides an accurate and useful approach for TRA in engineering applications.
Keyword ：
Nonstationary Nonstationary Non-Gaussian Non-Gaussian Outcrossing rate Outcrossing rate Analytical method Analytical method Time-dependent reliability Time-dependent reliability
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| GB/T 7714 | Li, Xiang-Wei , Zhang, Xuan-Yi , Zhao, Yan-Gang . Outcrossing Rate Method for Nonstationary Non-Gaussian Performance Functions and Its Application to Time-Dependent Reliability Assessment [J]. | JOURNAL OF ENGINEERING MECHANICS , 2024 , 150 (10) . |
| MLA | Li, Xiang-Wei 等. "Outcrossing Rate Method for Nonstationary Non-Gaussian Performance Functions and Its Application to Time-Dependent Reliability Assessment" . | JOURNAL OF ENGINEERING MECHANICS 150 . 10 (2024) . |
| APA | Li, Xiang-Wei , Zhang, Xuan-Yi , Zhao, Yan-Gang . Outcrossing Rate Method for Nonstationary Non-Gaussian Performance Functions and Its Application to Time-Dependent Reliability Assessment . | JOURNAL OF ENGINEERING MECHANICS , 2024 , 150 (10) . |
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Abstract ：
The damping modification factor (DMF) is used to modify the 5%-damped response spectrum to produce spectral values that correspond to other necessary damping ratios for seismic design. The DMF has been the subject of numerous studies, and it has been discovered that seismological parameters like magnitude and distance can have an impact on it. However, DMF formulations incorporating these seismological parameters cannot be directly applied to seismic design because these parameters are not specified in the present seismic codes. The goal of this study is to develop a formulation for the DMF that can be directly applied in seismic design and that takes the effects of magnitude, distance, and site conditions into account. To achieve this goal, 16660 ground motions with magnitudes ranging from 4 to 9 and epicentral distances ranging from 10 to 200 km are used to systematically study the effects of magnitude, distance, and site conditions on the DMF. Furthermore, according to the knowledge that magnitude and distance affect the DMF primarily by changing the spectral shape, a spectral shape factor is adopted to reflect influences of magnitude and distance, and a new formulation for the DMF incorporating the spectral shape factor is developed. In comparison to the current formulations, the proposed formulation provides a more accurate prediction of the DMF and can be employed directly in seismic design.
Keyword ：
magnitude magnitude damping modification factor damping modification factor distance distance site conditions site conditions spectral shape factor spectral shape factor response spectrum response spectrum
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| GB/T 7714 | Zhang, Haizhong , Deng, Jia , Zhao, Yan-Gang . Damping modification factor of pseudo-acceleration spectrum considering influences of magnitude, distance and site conditions [J]. | EARTHQUAKES AND STRUCTURES , 2023 , 25 (5) : 325-342 . |
| MLA | Zhang, Haizhong 等. "Damping modification factor of pseudo-acceleration spectrum considering influences of magnitude, distance and site conditions" . | EARTHQUAKES AND STRUCTURES 25 . 5 (2023) : 325-342 . |
| APA | Zhang, Haizhong , Deng, Jia , Zhao, Yan-Gang . Damping modification factor of pseudo-acceleration spectrum considering influences of magnitude, distance and site conditions . | EARTHQUAKES AND STRUCTURES , 2023 , 25 (5) , 325-342 . |
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Abstract ：
Non-Gaussian processes beset many aspects of structural engineering analysis. To estimate non-Gaussian processes, various third-order Hermite polynomial models have been proposed and widely applied. Different forms of expressions have been proposed for hardening and softening processes in existing Hermite polynomial models, which makes them inconvenient to implement. Furthermore, these models are either too simple to ensure accurate results or too complicated to implement conveniently. Thus, a unified third-order Hermite polynomial model that achieves a good balance between accuracy and convenience for both hardening and softening processes is proposed in this study. Explicit expressions for translations of the marginal distributions between the non-Gaussian and Gaussian processes using the proposed Hermite polynomial model are deduced, and the applicable ranges are provided. The accuracy of the proposed model is demonstrated by comparing the coefficients and estimated moments with those obtained from the moment-matching method. Furthermore, the application of the proposed model in evaluating first passage probability, analyzing fatigue damage, and estimating peak factors of non-Gaussian wind pressure coefficient histories is demonstrated with numerical and practical examples.
Keyword ：
Hermite polynomial Hermite polynomial Unified model Unified model Non-Gaussian process Non-Gaussian process Hardening process Hardening process Softening process Softening process
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| GB/T 7714 | Zhang, Xuan-Yi , Zhao, Yan-Gang , Lu, Zhao-Hui . Unified Hermite Polynomial Model and Its Application in Estimating Non-Gaussian Processes [J]. | JOURNAL OF ENGINEERING MECHANICS , 2019 , 145 (3) . |
| MLA | Zhang, Xuan-Yi 等. "Unified Hermite Polynomial Model and Its Application in Estimating Non-Gaussian Processes" . | JOURNAL OF ENGINEERING MECHANICS 145 . 3 (2019) . |
| APA | Zhang, Xuan-Yi , Zhao, Yan-Gang , Lu, Zhao-Hui . Unified Hermite Polynomial Model and Its Application in Estimating Non-Gaussian Processes . | JOURNAL OF ENGINEERING MECHANICS , 2019 , 145 (3) . |
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