Seismic behavior of novel low‐damage precast infill walls with sliding joints for reinforced concrete frame

Zhang, Chao; Yu, Tianhao; Chen, Zhangyan; Huang, Weiyuan; Zhang, Shaohua; Zhou, Yun; Lu, Dehui; Zhang, Lin

doi:10.1002/eqe.3746

Cited by 22 publications

(8 citation statements)

References 54 publications

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“…To aid in post-earthquake damage assessment of concrete structural components, the above-developed segmentation and quantification model is applied. The model utilizes detailed fine-scale damage descriptions of vertical load-bearing components based on the work of Zhang [53], and the seismic damage evaluation specification [54]. The whole failure process of components was recorded in enough experimental images, which were collected for this purpose.…”

Section: B Actual Applications For Post-earthquake Damage Assessment ...mentioning

confidence: 99%

Complex Crack Segmentation and Quantitative Evaluation of Engineering Materials Based on Deep Learning Methods

Jing,

Huan,

Wang

et al. 2024

IEEE Access

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Recognizing and quantifying microcracks on surfaces are crucial for early detection of structural damage, as they can lead to more complex issues in engineering structures. In this study, a dataset reflecting varying surface cracks on various engineering materials from the 2018 Ecuador earthquake was constructed. Furthermore, we proposed deep learning-based methods for recognizing and quantifying complex surface cracks. The methods utilized an enhanced U-Net semantic segmentation model, along with noise reduction and topological parameter extraction post-processing algorithms. The intersection-over-union recognition capacity for simple extended, complex crisscrossed, and microcracks was significantly improved, reaching as high as 91.71%, 89.56%, and 100% compared to the original U-Net. The results showed that the enhanced U-Net architecture had a steady training process and high accuracy in segmenting various types of cracks, especially microcracks, which were difficult to detect through manual observation or conventional imaging techniques. Therefore, the proposed model is suitable for pre-alarming monitoring of multiscale damage. A noise reduction post-processing algorithm was introduced to enhance the segmenting capability by extracting detailed characteristics of prediction samples. Statistical analysis of false-positive samples showed that 90% of misrecognitions were eliminated compared to the original situations. The study also developed an approach for determining the topological parameters of complicated patterns on hierarchical cracks in the refined masks at the pixel level. The average relative errors of area, perimeter, length, compactness, average width, and centroid coordinate for crack samples in ground-truth annotations and refined masks are below 10.75%, 1.89%, 1.51%, 6.20%, 9.75%, and 0.72%, respectively. Finally, a graphical user interface integrating all algorithms was explored and applied for damage assessment of structural components under various environmental disturbances.

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Section: B Actual Applications For Post-earthquake Damage Assessment ...mentioning

confidence: 99%

Complex Crack Segmentation and Quantitative Evaluation of Engineering Materials Based on Deep Learning Methods

Jing,

Huan,

Wang

et al. 2024

IEEE Access

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“…To achieve this goal, one option is creating flexible joints using deformable materials surrounding the interfaces of the infill walls and frame to isolate the infill from the primary structure. [42][43][44] The optional deformable materials include the silicone sealant, 45 polystyrene plate, 46 cellular material, 47 Styrofoam, 48 and polyurethane foam. 49 Moreover, forming sliding connectors represents another viable choice to protect the fragile boundary of the infill.…”

Section: Introductionmentioning

confidence: 99%

“…62 While these solutions indeed offer wall panels with commendable ductility and mitigate damage compared to conventional infill walls with door openings, they still exhibit undesirable corner crushing and crack development in the infill walls surrounding the door openings once the inter-story drift ratio higher than 3.0%. [63][64][65] Consequently, supplementary fixtures are often deemed necessary to safeguard both the infill wall and door opening. [66][67][68] The principal reason is that the introduction of door openings disrupts the working mechanism and force transmission mechanism of these infill systems.…”

Section: Introductionmentioning

confidence: 99%

“…The second method aims at eliminating the detrimental multiple‐diagonal strut mechanism within the infill wall with a door opening by isolating the infill wall from the boundary frame. To achieve this goal, one option is creating flexible joints using deformable materials surrounding the interfaces of the infill walls and frame to isolate the infill from the primary structure 42–44 . The optional deformable materials include the silicone sealant, 45 polystyrene plate, 46 cellular material, 47 Styrofoam, 48 and polyurethane foam 49 .…”

Section: Introductionmentioning

confidence: 99%

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Experimental and analytical studies of infill wall with sliding joints considering a door opening

Huang,

Niu,

Zhang

et al. 2024

Earthq Engng Struct Dyn

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Semi‐rigid steel frame stands out due to its remarkable deformation capability under seismic loading, while the introduction of partitioned walls would disturb the expected seismic behavior of the infilled steel frames. Furthermore, the presence of door openings might exacerbate these negative effects. To mitigate the detrimental multiple‐diagonal strut effect of traditional infill walls around the door opening, an innovative low‐damage wall panels system: prefabricated infill wall panels with a door opening and sliding joints are presented for semi‐rigid steel frames. For testifying the effectiveness of the proposed structure, a quasi‐static test was carried out on three half‐scaled steel frames: a bare frame, a frame infilled with conventional wall panels with a door opening, and a frame infilled with the novel wall panel system with a door opening. Experimental results reveal that the developed innovative wall panels with a door opening could avoid unfavorable crack developments and opening deformation around the door area. It is mainly attributed to the releasement of the adverse multiple‐diagonal strut mechanism of traditional wall panels with door openings. Thus, the presented infilled frame showcases seismic performance similar to the bare steel frame, while having a higher energy dissipation capacity. Moreover, the developed analytical prediction method based on the superposition principle could accurately estimate the lateral load‐carrying capacity of the structures. Due to negligible deformation of the both bottom infill wall panel and the door opening, the innovative infill wall only contributes about 10% lateral load‐carrying capability to the infilled frame.

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“…The final method is to split the infill wall around the opening into multiple horizontal or vertical subpanels to reduce lateral stiffness and create sliding joints between adjacent subpanels [22][23][24][25]. A recommended approach is to frame the opening with hardwood boards, with or without additional shear keys, and implement horizontal sliding joints above and below the window openings [15,26,27]. To protect vulnerable window openings, traditional solutions involve incorporating steel tubes [23,28] and wooden posts [29,30] to further confine the possible deformation of the openings.…”

Section: Introductionmentioning

confidence: 99%

Influence of window opening on cyclic behavior of precast infill wall with sliding joints

Huang

Chen

Zhang

et al. 2023

Preprint

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In engineering practice, creating window openings in partition infill walls is a common requirement for infilled frames. However, the intervention of infill walls may interrupt the desired cyclic behavior of the infilled frame, and worst yet, the inevitable window opening might further aggravate such negative interaction. To protect the openings from the detrimental multiple diagonal struts mechanism of the traditional infill wall with a window opening under lateral loadings, this research presents a novel infill wall system with a window opening for semi-rigid steel frames. Three half scaled specimens are subjected to quasi-static cycle tests: a bare steel frame, a steel frame infilled with a traditional infill wall with a window opening, and a precast infill wall with a window opening and sliding joints in a steel frame. Experimental results show that the proposed infill system with a window opening can release adverse crack development or opening deformation of the window opening by mitigating the detrimental multiple diagonal struts effect in conventional infill walls with window openings under lateral loadings. In this way, the developed infilled frame exhibits similar cyclic behavior to the designed bare steel frame with higher energy dissipation capacity. Furthermore, parametric analysis results reveal that the friction factor of the sliding joints has a significant effect on enhancing the bearing capacity of the proposed infill system, while the change of opening sizes and locations of the window opening has negligible impact on the cyclic behavior of the developed infill system.

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Seismic behavior of novel low‐damage precast infill walls with sliding joints for reinforced concrete frame

Cited by 22 publications

References 54 publications

Complex Crack Segmentation and Quantitative Evaluation of Engineering Materials Based on Deep Learning Methods

Complex Crack Segmentation and Quantitative Evaluation of Engineering Materials Based on Deep Learning Methods

Experimental and analytical studies of infill wall with sliding joints considering a door opening

Influence of window opening on cyclic behavior of precast infill wall with sliding joints

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