A Building Information Modeling-Life Cycle Cost Analysis Integrated Model to Enhance Decisions Related to the Selection of Construction Methods at the Conceptual Design Stage of Buildings

Life Cycle Cost Analysis (LCCA) provides a systematic approach to assess the total cost associated with owning, operating, and maintaining assets throughout their entire life. BIM empowers architects and designers to perform real-time evaluations to explore various design options. However, when integrated with LCCA, BIM provides a comprehensive economic perspective that helps stakeholders understand the long-term financial implications of design decisions. This study presents a methodology for developing a model that seamlessly integrates BIM and LCCA during the conceptual design stage of buildings. This integration allows for a comprehensive evaluation and analysis of the design process, ensuring that the development aligns with the principles of low carbon emissions by employing modular construction, 3D concrete printing methods, and different building design alternatives. The model considers the initial construction costs in addition to all the long-term operational, maintenance, and salvage values. It combines various tools and data through different modules, including energy analysis, Life Cycle Assessment (LCA), and Life Cycle Cost Analysis (LCCA) to execute a comprehensive assessment of the financial implications of a specific design option throughout the lifecycle of building projects. The development of the said model and its implementation involves the creation of a new plug-in for the BIM tool (i.e., Autodesk Revit) to enhance its functionalities and capabilities in forecasting the life-cycle costs of buildings in addition to generating associated cash flows, creating scenarios, and sensitivity analyses in an automatic manner. This model empowers designers to evaluate and justify their initial investments while designing and selecting potential construction methods for buildings, and enabling stakeholders to make informed decisions by assessing different design alternatives based on long-term financial considerations during the early stages of design.

3D Model Construction and Ecological Environment Investigation on a Regional Scale Using UAV Remote Sensing

The acquisition of digital regional-scale information and ecological environmental data has high requirements for structural texture,spatial res-olution,and multiple parameter categories,which is challenging to achieve using satellite remote sensing.Considering the convenient,facilitative,and flexible characteristics of UAV(unmanned air vehicle)remote sensing tech-nology,this study selects a campus as a typical research area and uses the Pegasus D2000 equipped with a D-MSPC2000 multi-spectral camera and a CAM3000 aerial camera to acquire oblique images and multi-spectral data.Using professional software,including Context Capture,ENVI,and ArcGIS,a 3D(three-dimensional)campus model,a digital orthophoto map,and multi-spectral remote sensing map drawing are realized,and the geometric accuracy of typical feature selection is evaluated.Based on a quantitative remote sensing model,the campus ecological environment assessment is performed from the perspectives of vegetation and water body.The results presented in this study could be of great significance to the scientific management and sustainable development of regional natural resources.

3D printing of functional bioengineered constructs for neural regeneration: a review

Three-dimensional(3D)printing technology has opened a new paradigm to controllably and reproducibly fabricate bioengineered neural constructs for potential applications in repairing injured nervous tissues or producing in vitro nervous tissue models.However,the complexity of nervous tissues poses great challenges to 3D-printed bioengineered analogues,which should possess diverse architectural/chemical/electrical functionalities to resemble the native growth microenvironments for functional neural regeneration.In this work,we provide a state-of-the-art review of the latest development of 3D printing for bioengineered neural constructs.Various 3D printing techniques for neural tissue-engineered scaffolds or living cell-laden constructs are summarized and compared in terms of their unique advantages.We highlight the advanced strategies by integrating topographical,biochemical and electroactive cues inside 3D-printed neural constructs to replicate in vivo-like microenvironment for functional neural regeneration.The typical applications of 3D-printed bioengineered constructs for in vivo repair of injured nervous tissues,bio-electronics interfacing with native nervous system,neural-on-chips as well as brain-like tissue models are demonstrated.The challenges and future outlook associated with 3D printing for functional neural constructs in various categories are discussed.

Construction and visualization of 3D vacant place model

The method of building 3D model was discussed at first. Aiming at the feature of mine vacant place,a method to build the 3D vacant place model based on multi TIN (triangular irregular network) was put forward, and the data structure and visualization of vacant place were discussed. Then some crucial technologies of realizing function in 3D-GIS were proposed. In addition,the software about special 3D mapping and assaying was introduced.

Enhanced Constructability Using 4D Plus Modelling in Brownfield Sites

In the oil and gas industry, operations in greenfield sites are straightforward. However, there are increased risks, such as damage to existing facilities, unknown site conditions, and other complexities in brownfield sites. In addition to these physical risks, task scheduling is also complex, as vessels need to be replaced during a turnaround. To mitigate the risks of site conditions and realize a truncated schedule for Saudi Aramco’s operations, 3D laser scanning was combined with 3D modeling, clash detection, and time. This integrated approach minimized the shutdown period, which resulted in cost savings, heightened safety, and enhanced stakeholder communications.

Research on the Three-dimensional Modeling and Optimization of a Virtual Tower Crane Based on 3DS Max, Solidworks and EON Professional

Three-dimensional modeling of virtual hoisting machinery is the critical works to structure the system of virtual construction, and the foundation to realize intelligent and interactive virtual hoisting. Aimed at enhancing the requests of image quality and stability of the virtual construction scene, taking a tower crane for example. We studied the technology of three-dimensional modeling and optimization of a virtual tower crane, and a method named two-stage model optimization was put forward. This depended on the modeling stage using Solidworks and 3DS Max and the performance optimization stage in EON. The practice of software development indicates that the proposed methods of three-dimensional modeling and optimization could satisfy the performance request of virtual construction system and be popularized to other virtual system.

NUMERICAL MODELLING OF THREE-DIMENSION CHARACTERISTICS OF WIND-DRIVEN CURRENT IN THE BOHAI SEA

Three- dimension (3-D) wind-driven currents in the Bohai Sea in both winter and summer are calculated by using a 3- D barotropic steady model, and the results are consistent with observed flow char -acteristics. Based on the results, 3- D characteristics of flow, currents at different depths, compensated flow in the lower layer , long and narrow alongshore current, the area of upwelling and downwelling, main circulation in vertical profile, and the current in Bohai Strait are discussed.

Three-Dimensional Visual Analysis for Construction Layout of Reservoir Project

It is difficult to analyze the inter-relationship for the construction layout of a reservoir project scientifically and intuitively.According to the characteristics of broad field and huge information,the modeling methods of digital terrain and solid model as well as the techniques of texture mapping and scene navigation are adopted.The simulation system is developed by C program language,which includes the functions of the interactive navigation of 3D scene,the visual inquiry of project digital model information,the storage and management of project information.A certain reservoir is taken as a case.The 3D visual analysis for the construction layout and engineering information are obtained.The proposed system is of great advantages in dealing with large amount of information and the method provides a theoretical basis and technical support for the construction layout of a reservoir project.

“3+2”助理全科医生培养模式构建探讨

建立全科医生制度是保障和改善城乡居民健康的迫切需要,全科医生是综合程度较高的医学人才,被称为居民健康的“守门人”。本文对“3+2”助理全科医生培养模式进行研究和探讨,构建基本框架,并就内涵建设、保障措施等方面作了较为深入的探讨。

基于“3+3”模式的“营养与配餐设计”课程建设研究

长沙环境保护职业技术学院的"营养与配餐设计"课程,按照"专业+车间+检验室"的人才培养模式,实现了课程教学过程及教学内容上的三个相统一。教学过程的三个统一是:理论与实践知识相统一,教材与职业资格鉴定标准(营养配餐员和公共营养师)相统一,真实实践场所与对应岗位相统一。教学内容的三个统一是:课程内容与职业标准相统一,课程目标与职业工程相统一,考核成绩与职业鉴定相统一。在实施的两年时间内,学生职业资格鉴定通过率100%,教师职业教学能力得到较大提升。

高维D=3 SM阵列编码构造和实现

本文基于第一作者1994年提出的D=2 SM阵列码的概念体系,进一步给出D=3 SM阵列码的编码规则和存在条件,并讨论其结构特点、构造步骤和设计分析。最后指出其编码性能和用途。

3D打印在教育领域的应用研究

3D打印机作为3D领域的一种前瞻性产品,带来了世界性的制造业革命,无需机械加工或模具,就能直接从计算机图形数据中生成任何形状的物体。目前,3D打印技术这种快速成型的新技术,已经应用于工业制造、医疗、建筑、航空航天、文化创意、数码娱乐、配件饰品行业和教育等诸多领域,越来越受到大家的关注。通过介绍3D打印的基本概念、原理以及发展状况和趋势,并通过案例设计,研究其在教育的各个学习阶段的应用;进一步分析了基于3D打印技术的教学应用模式;最后总结3D打印未来发展前景。

本土社会工作与专业社会工作的互构演化——“1+3”组合实践模式的学理阐释

"1+3"实践组合模式的学理研究表明:虽然两种社会工作的理念和方法截然不同,但二者既不是非此即彼的关系,也非简单的理论与实践的关系,因为在这些表象背后深藏着文明的冲突与整合;两种社会工作在相互对立的同时,也在相互建构,展示出互构演化发展的前景。

基于“四个1/3”的高职人才培养模式的构建

随着高职院校内涵建设的不断强化,生源水平的逐年降低,市场需求的不断提高,原有的高职院校人才培养模式难以适应社会发展的需求。对此,提出教师挂职锻炼、外聘企业骨干、学生校内实训、学生顶岗实习相互融合的基于"四个1/3"高职人才培养模式。

建筑工程制图3D建模研究

通过对建筑工程制图与CAD课程培养目标的分解,结合当前本课程的实际授课情况,构思出建筑工程制图与CAD课程能力构成及影响关系图。根据能力构成与影响关系图,给出了建筑工程制图与CAD课程的三大能力要素培养的具体实训措施,以识图为基础,制图为手段,最终实现3D建模。

When a tree model meets texture baking:an approach for quality-preserving lightweight visualization in virtual 3D scene construction

Three-dimensional(3D)high-fidelity surface models play an important role in urban scene construction.However,the data quantity of such models is large and places a tremendous burden on rendering.Many applications must balance the visual quality of the models with the rendering efficiency.The study provides a practical texture baking processing pipeline for generating 3D models to reduce the model complexity and preserve the visually pleasing details.Concretely,we apply a mesh simplification to the original model and use texture baking to create three types of baked textures,namely,a diffuse map,normal map and displacement map.The simplified model with the baked textures has a pleasing visualization effect in a rendering engine.Furthermore,we discuss the influence of various factors in the process on the results,as well as the functional principles and characteristics of the baking textures.The proposed approach is very useful for real-time rendering with limited rendering hardware as no additional memory or computing capacity is required for properly preserving the relief details of the model.Each step in the pipeline is described in detail to facilitate the realization.

基于3-RRRS机构的新型并联机床构型及运动建模

提出了一种基于3-RRRS机构的并联机床构型。RRRS是由3个R副和1个S副组成的支链。3-RRRS机构在上下平台之间连接移动平台,实现移动平台相对于下平台的六维运动;安装在移动平台上的动力头完成机床的加工操作。RRRS运动支链的每个R副配备1个驱动动力,共有3个驱动;整个运动支链系统有9个驱动,具有从属驱动特性,使并联机床具有较大的工作空间和较好的运动动态特性。首先,介绍了新型机床的模块化结构;其次,对基于3-RRRS机构的机床进行建模分析,给出了机床操作中各机构变量的运动和控制模型;最后,给出计算实例,并用运动仿真对计算结果进行了验证。相关工作为后续设备的实际使用提供了理论依据。

大型高架桥无支架盖梁施工过程模板受力特性的3D-FEM模拟分析

以上海S32高速公路闵浦大桥西侧引桥段的盖梁施工为例,通过合理的边界条件处理,基于ABAQUS有限元分析软件建立了复杂结构的3D-FEM模型,并以混凝土弹性模量和泊松比的变化模拟实际施工,进而分析无支架盖梁的受力状态.计算结果与现场实测的结果基本吻合,为无支架盖梁施工技术的研究分析提供了参考方法.研究表明:混凝土浇注完成约10 h左右,即具有90%的设计强度,基本能承受自身重力荷载,盖梁的竖向及横向荷载逐渐向混凝土转移;同时,该时间的确定为现场确定拆模时间、提高施工进度提供了依据.

Teaching Reform of Building Construction Course under the Background of New Digital Technology

With the advent of the information age,all walks of life have paid more and more attention to the development and application of digital technology.At the same time,the construction industry,which is a traditionally important industry,is not an exception.A series of high-tech digital technologies have been widely used in architectural design and construction,such as BIM technology,3D printing technology,and VR technology.In view of the teaching link of architectural talent training,it is necessary to keep up with the development trend of the digital age,integrate these three kinds of technology into architectural teaching,and impart knowledge to students from planar 2D textbooks to 3D visual digital models,and further transform it from 3D digital to physical perceive or virtual simulation level,and reform teaching methods in all dimensions and in all dimensions to improve teaching effect.In this paper,the feasibility and necessity of integration of the above three architectural digital techniques into the teaching process of"building construction"from the aspects of teaching content,teaching method and teaching evaluation were discussed,and a new teaching model under the background of digital technology was proposed,which has certain teaching reference significance.

纤维增强3D打印混凝土受剪破坏数值模拟

为评估3D打印建筑结构可靠度,利用纤维增强混凝土多尺度耦合数值分析平台,对纤维增强3D打印混凝土部件受剪破坏行为展开数值模拟。根据成型方式与打印材料组合设置不同算例,着重比较部件的破坏方式与抗损性能。模拟结果表明:添加纤维能显著提高混凝土裂后韧性;受制于薄弱的层间粘结,普通3D打印混凝土抗剪能力逊于一体浇筑成型混凝土;通过使用纤维对层间界面进行强化,打印成型混凝土的抗损性能可获得明显改善。数值模拟为提高3D打印建筑结构可靠性提供了理论思路。