Search Results (83)

The conservation and restoration of architectural heritage face dual challenges from natural erosion and human interference, necessitating the adoption of efficient and non-contact digital technologies to achieve sustainable preservation. Virtual reality (VR) technology, with its advantages of immersion, interactivity, and visualization, provides a novel technological pathway for digital documentation, conservation decision-making, and public presentation of architectural heritage. Taking the Fuliang Red Pagoda in Jingdezhen, Jiangxi Province, as the research object, this study constructs a high-precision digital reconstruction and VR interactive application workflow based on the integration of terrestrial laser scanning and close-range photogrammetry. Through point cloud denoising, Iterative Closest Point (ICP) registration, and Poisson surface reconstruction algorithms, a refined three-dimensional model of the pagoda is achieved, and an immersive VR system is developed with functions including component information query, virtual restoration scheme switching, and interactive exploration. The results demonstrate that this technical workflow not only enables non-contact digital archiving of the Fuliang Red Pagoda but also provides a visual decision-support tool for conservation interventions. Under full-scene operation, the system achieves an average rendering frame rate of 92 FPS and maintains motion-to-photon latency below 20 ms, ensuring good real-time performance and interaction stability. The findings indicate that VR-based digital technologies can enhance the scientific rigor of conservation planning and promote public engagement while adhering to the principles of authenticity and minimum intervention. This study provides a replicable technical pathway and practical reference for high-precision digital reconstruction and sustainable conservation of historic buildings. Full article

In the practice of historic building conservation and restoration, the authentic restoration of damaged components often faces challenges due to the lack of definitive design evidence. To address this issue, this paper proposes a restoration derivation method that integrates digital survey technologies, such as UAV oblique photogrammetry and 3D laser scanning, with the analysis of historical mathematical composition rules. Taking five Ming Dynasty pavilion-style stone pagodas in Fuzhou as subjects, this study first employed digital surveying and cross-verification with ancient texts to reveal their shared, precise proportional system: the eave–column ratio of the Ruiyun Pagoda approaches √2 (≈1.414), while the other four pagodas approach the golden ratio of 1.618. Furthermore, the pagoda silhouettes are governed by a √2 hierarchical system and a √3/2 visual correction mechanism. Based on these mathematical rules, a triple logical chain of “historical evidence verification–functional constraints–traditional adaptation” was constructed and applied to the quantitative restoration design of the damaged finial of the Luoxing Pagoda. This process ultimately derived the relationship between its total height and the first-story width as (L/2 + √2/2), with the finial height being 1/7 of the pagoda body’s total height. This case study validates the effectiveness of the proposed method in transforming profound historical wisdom into clear engineering parameters, offering a replicable and verifiable technical pathway for the digital conservation and scientific restoration of similar architectural heritage. Full article

The Yingxian Wooden Pagoda, a structure with a history spanning a thousand years, currently faces significant wind-induced safety risks. To understand the aerodynamic mechanism behind this issue, this study uses Computational Fluid Dynamics (CFD) with the Realizable k-ε turbulence model to perform high-fidelity transient simulations at wind speeds from 10 to 30 m per second. The results show that the highest positive pressure occurs on the sides of the windward face, while a large low-pressure vortex zone forms on the leeward side. The simulations include both the Kármán vortex street and the measurement of three-dimensional vortex-induced forces, marking a major advancement. A key finding is the synchronized period (ratio ≈ 1) of the along-wind and cross-wind forces, which differs from streamlined cylinders and is due to the pagoda’s unique octagonal shape. The force amplitudes increase exponentially with wind speed, while the average drag and lift have a quadratic relationship. Additionally, a new shape-specific correction factor of 0.875 is introduced to adjust the classical Strouhal formula, which greatly improves prediction accuracy for this type of ancient structure. This study offers both a theoretical foundation and a practical “digital wind tunnel” method for assessing wind-induced risks and supporting the safety monitoring of historic timber structures. Full article

Granite sawdust is a by-product in the process of stone processing, which is usually piled up, thus easily causing environmental pollution. To achieve resource utilization, granite sawdust was used as a partial substitution of cement in this work. The effects of different sawdust contents (10–50%) were systematically studied on the pore structure and the mechanical properties of its dry powder mortar. Combined with the grey correlation theory, the correlation between pore size distribution and compressive strength was analyzed. The results showed that the consistency and mechanical properties of the mortar gradually decreased along with the increasing sawdust content, while its critical pore-diameter decreased. The mortar performance was the best when its sawdust content is 10%, which meets the M25 technical requirements. When content reaches up to 30%, the mortar still met the strength standard of M20. Compared to fly ash, the mortar with 30% sawdust as the substitution has a higher water retention rate but lower mechanical strength. The grey correlation analysis indicated that the pores with diameters less than 10 nm and greater than 1000 nm had the most significant impact on the compressive strength. Full article

The sacredness of religious architecture stems from embodied spatial perception and interactive effects. This study examines the Sakyamuni Pagoda of Fogong Temple in Shanxi Province and explores the generative mechanism of its sacred space through fieldwork, literature analysis, and textual semantic analysis. Findings reveal that the Sakyamuni Pagoda’s sacredness is not an inherent property but is constructed through bodily pilgrimage practices, following a path from sensory experience to cognitive assessment. On the one hand, the pagoda’s material spatial form, the spiritual symbolism of its mural religious images, and the embodied practices of presence collectively constitute a perceptual realm of sacredness. On the other hand, these experiences are deepened into enduring sacred memories and collective identity through cognitive assessment activities such as emotional responses and meaning interpretation. The study reveals the generative logic of sacredness—from perception to internalization—within the continuous interaction between “body and space”, providing theoretical reference for the spatial interpretation of religious architecture and heritage revitalization. Full article

Cracks and holes are commonly found in wooden components, and ancient Chinese wooden buildings, represented by the Yingxian Wooden Pagoda, demonstrate the ability to work with defects. This study systematically investigated the effects of longitudinal cracks and circular holes on the load-bearing capacity of wooden beams through four-point bending experiments on 1580 specimens. The study focuses on load-bearing capacity as the core indicator and provides calculation formulas for the section weakening coefficient and damage tolerance coefficient to quantitatively evaluate the impact of defects. Research has found that the harmfulness of a defect strongly depends on its position within the wooden beam. In the horizontal direction, when the longitudinal crack is located in the pure bending section of the wooden beam, it has little effect on the load-bearing capacity of the wooden beam. Once it deviates to the transverse bending section, the load-bearing capacity of the wooden beam significantly decreases. The hole is most dangerous when it is located in the horizontal center of the wooden beam, and it is also dangerous when it is near the loading point. In the vertical direction, the crack has the greatest impact on the load-bearing capacity of the wooden beam when it is located in the middle-height layer or its vicinity, while its impact decreases when it is close to the top and bottom surfaces of the wooden beam. Holes have the least impact when approaching the middle-height layer, which is different from the impact pattern of cracks. In addition, the hazard increases when the hole is located in the tension zone of the wooden beam, and decreases when it is located in the compression zone. The anisotropy and fiber structure of wood are the microscopic basis for the damage-tolerance mechanical behavior of timber beams. Full article

A numerical simulation is conducted to investigate the interaction and burnout characteristics of mixed coal under O₂/CO₂ atmosphere in a 200 MW tangential firing boiler. Multiple models are utilized to simulate the flow and combustion processes inside the furnace, and a three-dimensional full-furnace model is constructed using an improved Weighted-Sum-of-Gray-Gases (WSGG) model. Using two types of coal and their mixed coal, the combustion of mixed coal under four O₂/CO₂ atmospheres is examined. Results show that there exists a significant interactive effect of promoting ignition and inhibiting burnout between difficult-to-ignite coal and easy-to-ignite coal. Increasing the proportion of easy-to-ignite coal helps improve the ignition performance of mixed coal. With a high proportion of easy-to-ignite coal, the oxygen-grabbing ability is enhanced. Increasing the inlet oxygen concentration can facilitate coal ignition and effectively enhance the burnout rate of difficult-to-ignite coal, mitigating the adverse effects of burnout inhibition. Among five typical oxidant-stream distribution methods, the positive pagoda oxidant-stream distribution can satisfy the combustion requirements of each layer, achieve relatively high burnout rates for difficult-to-ignite coal and mixed coal, and demonstrate the optimal comprehensive combustion performance. The findings can provide valuable references for optimizing oxygen-enriched combustion in boilers, thereby promoting the sustainability of coal-fired power generation. Full article

Stone cultural relics are primarily composed of sandstone, a water-sensitive rock that is highly susceptible to deterioration from environmental solutions and dry-wet cycles. Sandstone pagodas are often directly exposed to natural elements, posing significant risks to their preservation. Therefore, it is crucial to investigate the performance of sandstone towers in complex solution environments and understand the degradation mechanisms influenced by multiple environmental factors. This paper focuses on the twin towers of the Huachi Stone Statue in Qingyang City, Gansu Province, China, analyzing the changes in chemical composition, surface/microstructure, physical properties, and mechanical characteristics of sandstone under the combined effects of various solutions and dry-wet cycles. The results indicate that distilled water has the least effect on the mineral composition of sandstone, while a 5% Na₂SO₄ solution can induce the formation of gypsum (CaSO₄·2H₂O). An acidic solution, such as sulfuric acid, significantly dissolves calcite and diopside, leading to an increase in gypsum diffraction peaks. Additionally, an alkaline solution (sodium hydroxide) slightly hydrolyzes quartz and albite, promoting calcite precipitation. The composite solution demonstrates a synergistic ion effect when mixed with various single solutions. Microstructural examinations reveal that sandstone experiences only minor pulverization in distilled water. In contrast, the acidic solution causes micro-cracks and particle shedding, while the alkaline solution results in layered spalling of the sandstone surface. A salt solution leads to salt frost formation and pore crystallization, with the composite solution of sodium hydroxide and 5% Na₂SO₄ demonstrating the most severe deterioration. The sandstone is covered with salt frost and spalling, exhibiting honeycomb pores and interlaced crystal structures. From a physical and mechanical perspective, as dry-wet cycles increase, the water absorption and porosity of the sandstone initially decrease slightly before increasing, while the longitudinal wave velocity and uniaxial compressive strength continually decline. In summary, the composite solution of NaOH and 5% Na₂SO₄ results in the most significant deterioration of sandstone, whereas distilled water has the least impact. The combined effects of acidic/alkaline and salt solutions generally exacerbate sandstone damage more than individual solutions. This study offers insights into the regional deterioration characteristics of the Huachi Stone Statue Twin Towers and lays the groundwork for disease control and preventive preservation of sandstone cultural relics in similar climatic and geological contexts. Full article

This study examines the three pagodas of the Mireuksa Temple Site—the West, East, and Wooden Pagodas—to analyze how material evidence, cultural memory, and representation shape authenticity in architectural heritage. The research aims to clarify how different conservation strategies, including authentic restoration, speculative reconstruction, and digital mediation, influence the construction and communication of cultural memory. Methodologically, the study employs a comparative case analysis grounded in archival research, archaeological records, field observations, and interpretive analysis of digital media practices. The findings indicate three distinct patterns: (1) the West Pagoda demonstrates that evidence-based restoration can maintain both material and historical authenticity; (2) the East Pagoda shows that reconstructions based on limited evidence tend to generate visually convincing yet historically uncertain representations; and (3) the Wooden Pagoda illustrates that digital mediation can effectively communicate lost heritage, but only when its speculative nature is made transparent to the public. The most significant result is that authenticity cannot be defined solely by material survival but must be evaluated through the ethical and transparent communication of historical uncertainty. Based on these insights, the study proposes a conceptual framework of “memory authenticity,” offering heritage practitioners a tool for assessing restoration choices in contexts where architectural evidence is fragmentary or lost. The findings also provide practical implications for heritage management, including evidence-based decision-making, ethically informed digital interpretation, and responsible presentation of reconstructed or hypothetical forms. Full article

As urban spaces and cultural contexts continue to evolve, the conservation of immovable cultural heritage faces increasing challenges. This study adopts museumification as an extension of the living heritage continuity approach and examines how a religious monument can be re-embedded in contemporary social life. Using the Jin dynasty Sansheng (Three Saints) Pagoda in Qinyang City, Henan Province, as a case study, it analyzes the mechanisms through which museumification reshapes heritage value and public engagement. A three-dimensional analytical framework—field, space, and society—was developed, and data were collected through field observation, 205 questionnaire responses, and in-depth interviews with museum staff. The results show that museumification has enhanced the pagoda’s public visibility and symbolic meaning, strengthened local identity, and supported the transmission of historical knowledge. Visitors reported cultural pride, historical immersion, and emotional connection, demonstrating the museum’s role in maintaining the living continuity of the site. However, challenges such as limited exhibition space, insufficient narrative coherence, and the tendency for emotional experience to outweigh knowledge acquisition remain. Overall, the study offers empirical insights into the contemporary transformation of religious heritage and provides practical implications for conservation strategies based on museumification. Full article

To investigate the dynamic performance and seismic response of Ming dynasty masonry pagodas in the Jiangnan region of China, the Great Wenfeng Pagoda in Taizhou, Zhejiang Province, was selected as the study object. Based on on-site inspection and maintenance records, the in situ compressive strength of masonry at each level was measured using a rebound hammer, considering that the pagoda was immovable and no destructive testing was permitted. A numerical model of the pagoda was established using the finite element software ABAQUS 2016 with a hierarchical modeling approach. The seismic response of the pagoda was computed by applying the El Centro wave, Taft wave, and artificial Ludian wave, and the seismic damage mechanism, the distribution of principal tensile stress, and seismic weak zones were analyzed. The results showed that the horizontal acceleration increased progressively along the height of the pagoda. Under minor earthquakes, the pagoda remained largely elastic, whereas under moderate and strong earthquakes, the acceleration at the top and bottom and the story drifts increased markedly, with the effects being most pronounced under the Taft wave. The damage was primarily concentrated in the first and second stories at the lower part of the pagoda and around the doorway. Tensile stress analysis indicated that the masonry blocks in the first and second stories were at risk of tensile failure under strong seismic action, whereas the lower-level stone blocks in the first story remained relatively safe due to their higher material strength. This study not only reveals the seismic weak points of Ming dynasty masonry pagodas in the Jiangnan region but also provides a scientific basis for seismic performance assessment, retrofitting design, and sustainable preservation of traditional historic buildings. Full article

Ordovician marine red beds (OMRBs) are widely developed along the margins of Gondwana and represent distinctive limestone facies. These red beds are known for their diverse sedimentary structures and have been described by scholars as the “fashionable facies” in geological history. However, their characteristics and classification remain controversial. Multiple hypotheses about their origin have also hindered a clear understanding of these strata. Therefore, this study focuses on the Xiangxi area (South China) and presents a detailed analysis of the sedimentary structures of marine red beds, building on previous research on OMRBs in South China. Based on genetic features, we divide the most debated “nodule-like” and “cracked” structures—previously identified by earlier researchers—into ten subtypes. Three key genetic end-members are identified among these subtypes: breccia, patch, and argillaceous band. Detailed studies using microslab analysis, scanning electron microscopy, geochemistry, and paleontology were carried out on these three end-members. The results confirm that the Ordovician marine red beds were mainly deposited in a shallow marine environment, with the red coloration primarily derived from continental sources. As the sea level rose, the color of the red beds lightened, and the dominant sedimentary structures shifted from breccia end-members to argillaceous band end-members. Additionally, this study identified a vertically penetrating argillaceous band controlled by syndepositional compressive stress, which may be linked to NW-directed compression from the Kwangsian Orogeny. Evidence from tectonic styles, biofacies migration, and chronostratigraphy supports this hypothesis. Full article

This paper is a case study of the Tang-dynasty Gilded Silver “Bodhisattva Holding up the True Body” (peng zhenshen pusa 捧真身菩薩) Statue (dated 871) excavated from the relic crypt of the Famen Temple pagoda in Fufeng 扶風 County, Shanxi 陝西. Commissioned to commemorate Emperor Yizong 懿宗’s 39th birthday, the statue was designed both to support the Buddha’s relic and to express a wish for the emperor’s longevity. Most strikingly, the Bodhisattva is seated on a three-layered pedestal richly adorned with esoteric Buddhist images and Siddhaṃ scripts. Departing from previous Buddhalogical approaches, this paper suggests that the Famen Temple statue did not serve to illustrate a specific maṇḍala, theological doctrine, or scripture. Instead, together with the five miniature garments interred underneath it, the statue draws upon esoteric ritual technology—particularly the Three Siddhi mantras—as well as cosmological, botanical, and embryological imagery to create a soteriological matrix of bodily transformation for the intended beneficiaries. By situating the object within the historical circumstances and religious practices of the late Tang imperial court, this study illuminates the statue’s conceptual design, symbolic significance, and intended function—namely, to address the patrons’ concerns with spiritual salvation and the renewal of life after death. Full article

This study examines the evolution and integration of Buddhist architecture in East Asia and emphasizes the preservation of indigenous building traditions by adapting pre-Buddhist architectural typologies, vernacular construction techniques, and localized worship practices. In addition, this study highlights the adaptive transformation of Indian Buddhist structures as they incorporate regional architectural forms, resulting in distinct monumental styles that had a profound symbolic significance. By introducing the concept of a cosmopolitan attitude, it underscores the dynamic coexistence and reciprocal influence of universalized and vernacular architectural traditions. The findings highlight the interplay between cultural universality and particularity, illustrating how architectural meaning and intention define the uniqueness of structures beyond their stylistic similarities. This study demonstrates that even when architectural forms appear similar, their function and underlying intent must be considered to fully comprehend their historical and cultural significance. Full article

The so-called “counterfeit monks and nuns” 僧尼偽濫 is regarded as an important reason for the “Huichang Persecution of Buddhism” 會昌滅佛, but it reflects the central views of the Tang Dynasty. When we delve into the local society of the Mid-to-Late Tang period, we find that they developed their own narrative logic. From the perspective of the imperial court, Li Deyu 李德裕 criticized Wang Zhixing 王智興 for establishing an ordination altar in Sizhou 泗州 for personal gain. However, in the biographical inscription of monk Mingyuan 明遠 in Sizhou, Wang Zhixing is portrayed as a key figure who collaborated with Mingyuan to ensure the survival of the Kaiyuan Monastery 開元寺, with the inauguration of the ordination altar 戒壇 serving as a necessary means to obtain financial resources. In fact, Mingyuan had previously undertaken a similar operation at the Lingju Monastery 靈居寺 in Liuhe County 六合縣, Yangzhou 揚州. The inscription of the Lingju Monastery Stele 大唐揚州六合縣靈居寺碑 reflects the cooperation between local monks and secular people at that time. During the process of rebuilding the monasteries, Mingyuan cleverly exploited the cult of the divine monk Sengqie 僧伽 within the Society of Jianghuai 江淮. The cult of Sengqie had become a national belief during the Mid-to-Late Tang period, and the existence of the Sengqie pagoda 僧伽塔 made the Kaiyuan Monastery in Sizhou uniquely significant. Later on, Youxuan 幽玄 also carried out similar initiatives by establishing an ordination altar for the restoration at the Baoli Monastery 寶曆寺 in Hongzhou 洪州. If we set aside the shadow of the overarching theme of the Huichang Persecution of Buddhism on the history of Buddhism during the Mid-to-Late Tang period, we may uncover a more vibrant picture of local Buddhism. Full article