Flexural Behavior of Typical Chinese Traditional Timber Stitching Beams

In Chinese traditional timber buildings, stitching is very common. When the bearing capacity or the rigidity is inadequate, a timber beam is often strengthened with another beam using the stitching method. The timber stitching beams are mainly of two types—the small-top/big-bottom type and the big-top/small-bottom type. To study the bending behavior of these two types of timber stitching beams, including the failure mode, the flexural capacity, the strain distribution at mid-span section, and the maximum deflection, bending tests are carried out on 14 timber stitching beams with Chinese traditional conformation for seven pine beams and seven fir beams. The results show that the failure modes of the small-top/big-bottom type of stitching beams all show brittle fractures at the bottoms of the bottom beams. The failure modes of the big-top/small-bottom type of stitching beams all show brittle fractures at the bottoms of the top beams. The distribution of section strain along the height of each part of the beam basically obeys plane hypothesis. Based on the theoretical and experimental analysis, the calculation formulas of flexural capacity and maximum deflection of these two types of timber stitching beams made of pine and fir are presented.     

The Mazarrón 1 Shipwreck: an iron‐age boat with unique features from the Iberian Peninsula

Two iron‐age shipwrecks, associated with Phoenician ceramics, were discovered at the Playa de la Isla in Mazarrón, Spain. This preliminary report describes hitherto unknown boatbuilding features of the Mazarrón 1 hull remains. The vessel presents hybrid boatbuilding techniques using both pegged mortise‐and‐tenon plank‐edge fasteners and sewn seams employing longitudinal continuous stitching, and a unique keel scarf. It is an important source of information for the development of shipbuilding in the western Mediterranean during the Iron Age.     

微生物诱导碳酸钙修复汉白玉石梁裂缝试验研究

石质文物劣化后产生裂缝等病害,需要恰当的修复方法。本研究应用微生物诱导碳酸钙沉积技术修复汉白玉石梁裂缝,模拟石质文物裂缝修复。研究对象为带V型槽的非贯通和贯通裂缝的汉白玉石梁(尺寸为40 mm×40 mm×160 mm),修复方法为先注浆后自由下渗。通过对比石梁修复前后破坏荷载和强度的变化以及CT扫描技术可视化非贯通裂缝修复过程来评价修复效果。结果显示:修复后石梁裂缝表面致密光滑,颜色与母材相近,整体美观性好;非贯通裂缝修复后破坏荷载均有所增加,贯通裂缝修复后的抗折强度能恢复到原有强度的35.12%,均值为3.684 MPa,最高能达到5.234 MPa;CT扫描结果定性和定量均表明胶凝体密度随修复进行而增加,接触面修复质量弱于其他位置。     

Lead‐Glazed Rustiques Figulines (Rustic Ceramics) of Bernard Palissy (1510–90) and his Followers

The glaze chemistry of a group of rustiques figulines attributed to the renowned French potter Bernard Palissy (1510–90), or to his followers and imitators, has been determined non‐destructively using PIXE and PIGE analyses. The glazes are all lead silicates, the colourants being transition metal oxides—CuO, CoO, MnO and Fe₂O₃—with a small addition of SnO₂ to some of the glazes being common. Some distinction can be made between the various fabricated objects based on details of the overall composition and on the concentrations of the various colourants. The presence of B₂O₃ in any glaze, even in quantities as small as 0.1–0.3%, indicates a post‐16th century production. Additionally, B₂O₃ in larger quantities, a few per cent or greater, very probably indicates an 18th–19th century production. However, at least one object known to be of 19th century production contains no B₂O₃.     

荆州文庙大成殿维修勘察测绘报告

荆州文庙大成殿为清代中期一座建筑。本文通过对大成殿现场勘察测绘,并结合有关资料阐述了荆州文庙兴衰的历史过程,同时对大成殿建筑结构的测绘分析,挖掘出这座古老建筑独特风貌和别具一格的建筑工艺,反映我国古代劳动人民无穷智慧和伟大的创造力,从而使我们不遗余力地保护这座建筑,使之千秋万代。     

用电子束辐照加固秦俑彩绘

为有效加固秦俑彩绘,选择单体渗透、电子束辐照加固方法进行保护。在最佳辐照加固条件：以2-羟基甲基丙烯酸乙酯为单体,用1MeV2．0mA 60kGy电子束辐照可有效地加固秦俑彩绘层。加固后的陶俑表面没有出现光泽,彩绘层颜色鲜艳如初,生漆层、颜料层也再无起翘、脱落现象,干燥、自然。     

SIMPLIFIED MODELLING STRATEGIES TO SIMULATE THE DYNAMIC BEHAVIOUR OF R/C WALLS

A continuous damage model and different simplified numerical strategies are proposed to simulate the behaviour of reinforced concrete (R/C) walls subjected to earthquake ground motions. For 2D modelling of R/C walls controlled primarily by bending, an Euler multilayered beam element is adopted. For 3D problems, a multifibre Timoshenko beam element having higher order interpolation functions has been developed. Finally, for walls with a small slenderness ratio we use the Equivalent Reinforced Concrete model. For each case, comparison with experimental results of R/C walls tested on shaking table or reaction wall shows the advantages but also the limitations of the approach.     

French Decorative Ceramics Mass‐Produced During and After the 17th Century: Chemical Analyses of the Glazes

Chemical analyses of a group of Pb silicate–glazed decorative objets d'art showing scenes of the French royal family (Louis XIII and Henri IV), and biblical and classical figures, have been analysed and compared with other similar heritage ceramics and with the rustiques figulines of Bernard Palissy (1510–90) and his followers and imitators. In particular, non‐destructive ion‐beam chemical analyses (PIXE and PIGE) have been performed on 11 ceramic artefacts from the Cleveland Museum of Art (CMA) and a like number from several French museums; results for 13 objects are described in detail in this paper. SEM–EDX has been performed on chips (‘microsamples’) taken from small unobtrusive defective regions on the CMA ceramics. The results of the ion‐beam and SEM–EDX techniques are in good agreement. All the decorative ceramics included uniform non‐opacified glazes. None of these objects can be of 16th century production; all must date from the 17th to the 19th centuries.     

Flexural Performance of Small Fir and Pine Timber Beams Strengthened With Near-Surface Mounted Carbon-Fiber-Reinforced Polymer (NSM CFRP) Plates and Rods

In order to study the flexural performance of fir and pine timber beams strengthened with near-surface mounted carbon-fiber-reinforced polymer (CFRP) plates and rods, bending tests on 20 specimens are carried out, including four unstrengthened specimens, four specimens strengthened with CFRP plate with the dimension of 1.4 mm × 30 mm, four specimens strengthened with CFRP plate with the dimension of 2.8 mm × 30 mm, four specimens strengthened with one Φ6 mm CFRP rod, and four specimens strengthened with one Φ8 mm CFRP rod. The proportions of fir specimens and pine specimens are 50% and 50%. The results show that compared with the unstrengthened specimens, there is an improvement in flexural capacity and stiffness of the specimens strengthened with near-surface mounted CFRP plates and rods respectively. Finally, the calculation formulas of the flexural capacity of fir and pine timber beams strengthened with near-surface mounted CFRP plates and rods are presented.     

成都老官山汉墓出土织机复原研究

成都老官山汉墓出土了四台多综织机模型,提供了古代多综织机的实物证据。它们都采用一样的移动齿梁选综机构,提综机机构却有不同,一台织机用一个旋转踏板提升滑框,滑框再提升多片纹综。另外三台方法相同,用一个旋转踏板提升连杆,连杆再提升多片纹综。通过出土文物的实物对照,分析选综机构和提综机构的机械原理,比较两种提综机构的性能优劣,从而推断滑框式织机可以织造经向纹样循环大的经锦,但操作较费力;曲柄连杆式织机织造的经锦纹样循环虽小,但操作省力。分析过程同时也展示了古人杰出的智慧和创造力。