浅谈道路桥梁结构病害与加固

道路桥梁建设是我国道路建设的一个重要环节,道路建设的好坏直接影响到我国交通运输的情况,通过交通运输进而对我国的经济建设和社会发展形成一定的影响。本研究就我国现阶段我国道路桥梁结构常见的病害、形成病害的主要原因及病害的不良影响、道路桥梁结构病害与加固的重要性进行全面系统的分析和论述,并在此研究基础上针对有效预防和排除道路桥梁结构病害,加固道路桥梁结构的策略和方法给出几点建议,以供相关建筑行业的人士参考和学习。     

高层建筑结构工程选型及布置研究

随着对建筑结构和功能需求的需求增加，高层建筑迎来了新的发展。对于高层建筑结构设计来说，抗震性能起着关键作用，而建筑结构选型及布置工作又是抗震设计的重点。为此，本文将从高层建筑结构选型及布置上，来分析不同结构选型、不同建筑结构布置对建筑受力性能的影响。     

炭纤维微观结构研究现状与未来的浅见

总结了炭纤维微观结构研究的现状与问题，并预测这一研究领域的今后发展动向。     

肋板楼盖与网架杂交应用的实践

本文结合一个工程实例，介绍传统钢筋混凝土肋板楼屋盖结构与大空间钢结构杂交应用中，起着的初步索实践，介绍传统钢筋混凝土板壳结构拓宽应用思想。     

钢筋混凝土巨型结构在高层建筑中的应用

巨型结构是近年来出现的一种新型高层结构形式。本文搜集了国内外部分钢混凝土巨型结构实例（包括钢－混凝土混合结构）,给出了种建筑的基本和主要设计参数,为相关研究人员提供了较为系统的参考资料。     

工程结构选型方案对比分析研究

由于经济的发展,高层建筑更是有如雨后春笋般迅速发展,数量剧增。而目前的工程设计领域中,往往不够重视结构经济性问题,导致同一工程不同的人设计其土建造价可能差别很大,造成不必要的浪费。本文通过计算软件SATWE对同一建筑进行两个不同结构方案的计算、分析、比较,验证了高层结构选型在结构设计中的重要地位。     

建筑设计中的结构艺术性展示

“结构艺术”的概念虽然早在十九世纪被提出，但是在建筑界这个词汇却一直未能得到关注。而近些年很多建筑的设计理念却暗含了“结构艺术”的思想。我们是时候应该探讨一下这个对我们建筑师即陌生又熟悉的词汇了。     

大跨空间结构理论研究和工程实践

结构形式的创新和有力的理论研究支持,是大跨空间结构健康发展的两个关键因素。文章结合笔者参与的若干大型工程,从一个侧面反映我国十余年来在空间结构形式创新方面所进行的努力。简要介绍了笔者在悬索体系解析计算理论、单层网壳结构稳定性、网壳抗震性能和振动控制、悬索和薄膜结构的风致动力响应等理论研究领域取得的一些进展     

结构工程论

现在已经出现了结构艺术的提法,但这并不是一个新的现代艺术运动,因为自从马期．泰尔福特（Ｔｈｏｍａｓ Ｔｅｌｆｏｒｄ）在１８１２年将现代结构表现出来以后,到目前为止,结构工程的形式和概论基本上没有改变。为了建立完善的结构设计思想,提高结构工程设计手法,本文首次对结构哲学展开研究从结构与机械,结构与建筑,结构的三维特性等三方面对结构进行了论述。     

建筑结构设计的常见问题研究

建筑工程质量至关重要,主要由设计质量和施工质量两个方面来衡量。本文主要阐述建筑设计中在结构设计方面存在的普遍问题,并提出了针对这些问题的防治方法,以满足建筑、结构相协调,体现建筑安全、合理、经济的原则。     

Effect of Permeable Crystalline Material on Steel Reinforcement Corrosion of Concrete

Permeable crystalline materialcan permeate into pores and cracks of concrete and catalyze the reaction between Ca(OH) 2and unhydrated cement to generate a great quantity needle non-soluble crystals, which can stop up the pores and cracks of concrete, and increase the impermeability of concrete. This paper reported the results of a study conducted to evaluate steel reinforcement corrosion of concrete specimens uncoated and coated with permeable crystalline material as well as mixed with the permeable crystalline material. The properties evaluated for corrosion test were water impermeability, water absorption, compressive strength and potential. The results of water impermeability, water absorption, compressive strength clearly showed that the permeable crystalline material could prohibit water, any soluble salts and moisture from penetrating the concrete to cause corrosion, leaking, and other problems, and it did increase the compressive strength, which was favorable for protection of corrosion of reinforcing steel. Moreover, it was concluded from the potential-time curve that the steel reinforcement of uncoated specimen was in the state of activation whereas that of other specimens coated and mixed with the permeable crystalline material was in the state of inactivation. Above all, it was indicated that the permeable crystalline materialis very effective to protect the steel reinforcement of concrete from corrosion.     

The Research and Application About "Dry Peeling Off" Technology for Airplane Surface Paint Layer

In this paper, the principle of spurting take off lacquer were introduced; and with orthogonal method the unsaturate polyester was prepared ;it was easy to peel airplane paint layer off with this material and equipment.     

Quality Study of Honeycomb Core Shaping Without Wax Stabilization

Sandwich panels utilizing honeycomb cores result in lightweight, high-strength units that are very rigid. Indeed, they give honeycomb panels the best strength-to-weight ratio of any construction type available. Conventionally, the wax is poured into the cell of the core to strengthen the structure and prevent the core from being crushed during milling. Much time and labor is required to wax, mill, and clean the cores. In this study, the process of pouring wax into the core was skipped. In other words, the cutter directly milled the core. Experiments showed that the compressive strength of the core produced without wax stabilization was only 3% lower than that of cores produced using the traditional method. In addition, the drum peel strengths of cores produced without wax stabilization were 38.4% higher than cores produced using the traditional method, in which residual wax seriously polluted the adhesive. It was also found that eliminating the wax process can reduce costs.     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

In-process thermal treatment of polylactic acid in fused deposition modelling

Polylactic acid (PLA) is one of the most widely used open source fused filament fabrication materials due to its ease of extrusion, biodegradability, and mechanical strength. The mechanical strength of PLA largely depends on the proper growth of its semi-crystalline structure, which can be severely impaired by a low rate of crystallization, particularly in open source printers. This can be further aggravated by the non-uniform thermal distribution of heat that causes improper curing among the extruded beads of the printing material. As a result, PLA printed on open source printers does not achieve the best mechanical properties. This research, for the first time, proposes an additive-free solution implemented through a detailed set of experimentation to improve the curing rate through in-process temperature variations to cure the joints among the beads. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy is used to confirm the improvements in the bead joints. This work is conducted in two phases of experiments. In the first phase, a full factorial ANOVA is used to investigate various process parameters and the important variables are used in the second phase to print test specimens in four different sets.     

Investigation of the Corrosion Behaviors of HVOF-Sprayed Carbide Cernet Coatings in Molten Al-Zn-Si Alloy Bath

In continuous hot-dip galvanization process the corrosion and chemical stability of the sink roll in the galvanizing bath are important problem which effects on the quality and productivity. In order to protect the sink roll the carbide cermet and/or ceramic coatings were deposited on the surface of the sink roll. The WC-, Cr3 C2-cermet coatings were deposited by high velocity oxygen fuel (HVOF) spray, respectively. The coating samples were immersed in molten Zn-alloy containing 50 wt % aluminum at 833 K for 24 hr and 144 hr, respectively. The inter-diffusion and inter-reaction of Zn, Al and elements in coating and corrosion behaviors of these coatings were investigated by XRD, SEM and EPMA etc. The corrosion mechanisms of the carbide cermet coatings and ceramic coatings in molten High Al-Zn-alloy were approached.     

Fundamental study of adhesion of ice to cooling solid surface (Discussion on influence of copper oxide layer on ice adhesion force)

In many situations, ice often adheres to a cooling solid surface, frequently causing serious accidents. It is critical to clarify the mechanism of ice adhesion to the cooling surface in order to prevent ice adhesion. In a past study, the shearing stresses of two kinds of test plates with a copper surface having the higher thermal conductivity were measured. The shearing stress corresponds to ice adhesion force. Both shearing stresses were significantly different; however, the cause remains unclear.Therefore, the present study focuses on an oxide layer as the main factor causing the difference of both shearing stresses; the influence of the oxide layer formed on shearing stress was discussed. And in the removal and reformation processes of the oxide layer, the time variation of the shearing stress was clarified. Moreover, the relationship between the state of the copper surface and the shearing stress was also clarified by surface analysis.     

＂Three Transformations＂ and Standardization

During his inspection in Henan Province in May, Chinese President Xi Jinping stressed to ＂push forward the transformation from China Speed to China Quality, from Made in China to Created in China, and from Chinese Products to Chinese Brand＂. The ＂Three Transformations＂ are the specific requirements and goal of China＇s national development in the context that market should play a decisive role in the allocation of resources.     

重塑标准推行格局 推动LED照明的普及（英文）

正When you are enjoying the green,energy-saving and healthy lighting of IKEA LED luminaire,you may not realize that most of IKEA’s LED bulbs are produced by the LED luminaire smart manufacturing system of Hangzhou Zhongwei Photoelectricity CO.,LTD(ZVISION).No longer enclosed in the laboratory,the product standards are brought into the factory workshop and even to the entire production process.Thus,the standards are promoted and applied in a favorable way by enterprises,benefitting consumers with high quality products.     

Chinese Experts Contribute to ISO＇s New Toy Standards

正The international standard,ISO 8124-6,Safety of toys–Part 6:Certain phthalate esters in toys and children’s products,was officially issued by ISO worldwide on August 15.It was the first time for Chinese experts to lead the ISO standard development in toys industry.The standard was drafted by a group of Chinese experts from SAC/TC for toys and relevant Chinese departments and finally completed by a dedicated international group of experts.ISO 8124-6 makes a substantive breakthrough in the aspects of the scope of toys,limitation of plasticizer types,control of test cost,accuracy of test,operation convenience,etc.,offering the operational guidance for toy manufactures and testing laboratories.