中国科大北区学生食堂结构设计

本文重点介绍了空腹夹层板柱结构体系新技术在本工程中的运用及特点,探讨了在设计与施工中应注意的问题。本工程空腹夹层板结构设计为安徽地区首例,理论分析与实践表明,空腹夹层板楼盖体系具有良好的力学特性及技术经济指标。     

预应力混凝土夹层板楼盖结构

提出了新型预应力混凝土夹层板楼盖结构体系的设计慨念、构造与施工技术的工程实践经验,重点介绍了跨度(或柱网)6～12m的多层与高层建筑。进行了楼盖结构体系的经济效益分析,提供了同条件的多种楼板组成的楼盖结构体系的技术经济分析数据。结果表明,预应力混凝土夹层板楼盖结构具有施工方便、节省造价、增大使用空间等优点。     

钢筋混凝土空腹夹层板楼盖的设计与研究

钢筋混凝土空腹夹层板楼盖体系是一种新型板系空间网格结构体系,具有节省净空高度,楼板跨度大,上下弦间可穿设备管线,结构布置灵活等优点。目前钢筋混凝土空腹夹层板楼盖应用于多项工程实例中,针对某项目应用空腹夹层楼盖结构进行分析及具体结构设计计算。     

大跨度钢筋混凝土楼盖力学性能与经济性分析

钢筋混凝土空腹网架楼盖和空腹夹层板楼盖是基于大跨度楼盖需要产生的新型楼盖形式。详细介绍了几种大跨度钢筋混凝土楼盖的构造特点,推导了考虑剪切变形的钢筋混凝土空腹网架楼盖和空腹夹层板楼盖的等效剪切刚度。以25m×25m大跨度楼盖工程为例,利用ANSYS和PKPM软件对钢筋混凝土密肋井字梁楼盖、空腹网架楼盖和空腹夹层板楼盖的力学性能和经济指标进行了对比分析。结果表明:三种形式的楼盖在均布荷载10kN/m2作用下的挠度均能满足《混凝土结构设计规范》(GB 50010—2010)要求,其中钢筋混凝土空腹网架楼盖和空腹夹层板楼盖经济性能更好,具有明显的优势。     

U形钢板-混凝土高强螺栓连接组合空腹夹层板楼盖结构研究与应用

提出一种多层大跨度结构体系--U形钢板 混凝土高强螺栓连接组合空腹夹层板楼盖,该结构体系由U形钢板-混凝土组合下肋、钢筋混凝土上肋和上下肋间设置的钢筋混凝土剪力键形成的需考虑夹芯层剪切变形的空间楼盖。介绍了该楼盖结构体系的简化计算模型、弹性连续化理论分析方法和实用分析方法,通过仿真模型试验及实际工程应用,验证了弹性连续化理论分析方法与实用分析方法的正确性。研究结果表明：采用由上、下表层薄膜刚度和具有一定抗剪刚度的剪力键夹芯层组成的U形钢板-混凝土高强螺栓连接组合空腹夹层板楼盖简化计算模型进行弹性连续化理论分析,其分析结果与仿真模型试验结果基本相符,相对误差最大不超过5%;按等强和等刚度原则将U形钢板-混凝土组合空腹夹层板折算成钢筋混凝土实腹梁的实用分析方法,其计算结果与仿真模型试验结果基本相符,相对误差最大不超过4%。以黑龙江中医药大学文体中心B区57 m×39 m+57 m×36 m双跨多层（地下1层、地上3层）工程为算例,并与原位测试结果进行比较,说明U形钢板-混凝土高强螺栓连接组合空腹夹层板楼盖安全可靠,且具有较好的经济性。     

型钢混凝土组合空腹夹层板结构静动力性能分析

针对现有U形钢板-混凝土组合空腹夹层板楼盖结构体系在实际应用中存在的一些问题,提出了以H型钢组合结构构件替代原有空腹夹层板中的主要构件,形成了型钢混凝土组合空腹夹层板楼盖结构体系。同时结合实际工程案例将型钢混凝土组合空腹夹层板楼盖体系的分析、设计结果与U形钢板-混凝土组合空腹夹层板的设计结果进行对比,并对型钢混凝土组合空腹夹层板结构进行三向罕遇地震作用下的动力弹塑性分析。研究表明,在多层大跨度建筑结构中,型钢混凝土组合空腹夹层板受力性能良好,能满足结构的承载力要求和正常使用要求,在罕遇地震作用下,型钢混凝土组合空腹夹层板整体性较好,抗震性能良好,建议在跨度较大时选用型钢混凝土组合空腹夹层板结构。     

大跨钢结构空腹夹层板楼盖设计

钢结构空腹夹层板楼盖是基于多层大跨钢结构的一种新型空间网格结构体系。这种新型空间网格结构体系是由上肋、下肋和上下肋之间设置的剪力键组成。本文通过哈尔滨武源小区商业广场屋面大跨钢结构空腹夹层板楼盖结构的设计和分析,介绍了钢结构空腹夹层板楼盖的实用计算方法,以及主要构件和节点的设计要点。设计同时采用MIDAS/Gen有限元分析软件进行建模分析,验证了采用实用计算方法进行钢结构空腹夹层板屋盖设计的可靠性。本文还对钢结构空腹夹层板楼盖结构的自振特性和舒适度进行了分析。分析结果表明大跨钢结构空腹夹层板楼盖体系安全、可靠,满足舒适性要求。     

正六边形多层大跨度公共建筑的混凝土蜂窝型空腹夹层板楼盖结构研究

多层大跨度公共建筑的混凝土结构体系的关键是楼盖,传统的楼盖做法是混凝土和预应力混凝土框架结构平面力系。在混凝土空腹夹层板结构的基础上,提出正六边形平面的多层大跨度混凝土蜂窝型空腹夹层板楼盖,以满足公共建筑楼盖平面形式多样化的要求。介绍了新结构体系的组成、构造、力学特性,并与传统结构体系进行对比分析,结果表明,在正六边形平面中,新结构的力学模型为一块考虑剪切变形的类似圆形平面的夹芯板,其经济指标优于传统结构。     

装配式钢空腹夹层板楼盖分析与设计

钢空腹夹层板楼盖是由上肋、下肋和上下肋之间设置的剪力键组成的新型空间网格结构体系,适合于多高层大跨度工业和民用建筑.本文以简阳市某实际工程为例,采用通用有限元分析软件YJK和MIDAS分别进行了分析计算,论述了钢空腹夹层板的设计方法和关键节点.分析结果表明,钢空腹夹层板楼盖受力合理,结构安全可靠,适合装配式建造.研究成...     

新型复合空腹夹层板楼盖力学性能有限元分析

对新型复合空腹夹层板楼盖的构造进行了介绍,通过有限元分析软件ABAQUS模拟新型复合空腹夹层板楼盖在静力荷载作用下挠度、破坏及自振周期。模拟结果表明:与钢筋混凝土空腹夹层板楼盖相比,新型复合空腹夹层板楼盖在同级静力荷载下挠度减小,楼板自振周期增大,能够使结构远离地震卓越周期,减轻地震破坏。     

Unsteady thermal performance analysis of a room with serial and parallel duct radiant floor heating system using hot airflow

In this study, the unsteady thermal performance of a test room heated by circulating hot airflow under the floor was analyzed with a developed mathematical model based on heat transfer equilibrium among the air flow, the floor and the indoor air. The time variations in the indoor air temperature for the serial duct floor heating system were investigated theoretically and experimentally. The time variations in the floor surface and the indoor air temperatures were predicted theoretically for the parallel duct floor heating system. Experiments on the time variations of the dimensionless numbers such as Nu for the airflow in duct and the indoor air, Gr for the indoor air and the heat ratios of convection and radiation to total heat for the serial duct floor heating system were performed. The theoretical and experimental results showed a good agreement.     

Numerical simulation of radiant floor cooling system: The effects of thermal resistance of pipe and water velocity on the performance

Using the existing floor heating system, the radiant floor cooling system can be used as an alternative to the conventional all-air cooling systems. In this paper, a numerical model for the radiant floor cooling system is built using finite volume method. The objective of this study is to research the effects of the thermal resistance of pipe and water velocity on the performance of the radiant floor cooling system. In order to provide better heat transfer simulation in the pipe, composite grids are used in the model. The numerical floor surface temperature and the heat flux are in agreement with the measured results. The results illustrate that the pipe has effect on the performance of the radiant floor cooling system when the thermal conductivity of the pipe is low. However, the effect of the water velocity on the performance of the cooling system is not great. The model is helpful to calculate and design such kind of radiant floor cooling systems.     

湘电重装装配车间重载地面设计研究

通过对湘电重装360t矿用重型电传动车辆装配车间地面的计算与分析,探讨了非均布荷载或活荷载,且荷载等级属特重的地面的设计.     

大跨预应力次梁楼盖结构体系经济性分析

根据几类已建工程的调查统计、分析对比,对与传统设计手法不同的大跨预应力次梁楼盖结构体系的经济合理性做了详细分析,结果表明这种体系方案合理,综合经济效果显著.     

石膏空腔模填充混凝土空心楼盖研制及应用

提出了一种新型现浇混凝土空心楼盖,从加工、研制、施工、结构、经济、运用等方面介绍了这种新型楼盖的特性。研究与运用结果表明,该楼盖体系具有经济、实用、易施工、结构性能好等诸多优点,是值得推广的环保节能型空心楼盖体系。     

A calculation method for the floor surface temperature in radiant floor system

In this paper, a calculation method for the floor surface temperature in radiant floor heating/cooling system is proposed, a new formula is derived to estimate the floor surface temperature. The floor is divided into two layers. The correlation for the thermal conductivity of the lower layer is developed based on the numerical model of the radiant floor system built in this paper. The results show that the floor surface temperature values from the proposed method are in agreement with the experimental and numerical values.     

Modelling floor heating systems using a validated two-dimensional ground-coupled numerical model

This paper presents a two-dimensional simulation model of the heat losses and temperatures in a slab on grade floor with floor heating which is able to dynamically model the floor heating system. The aim of this work is to be able to model, in detail, the influence from the floor construction and foundation on the performance of the floor heating system. The ground-coupled floor heating model is validated against measurements from a single-family house. The simulation model is coupled to a whole-building energy simulation model with inclusion of heat losses and heat supply to the room above the floor. This model can be used to design energy efficient houses with floor heating focusing on the heat loss through the floor construction and foundation. It is found that it is important to model the dynamics of the floor heating system to find the correct heat loss to the ground, and further, that the foundation has a large impact on the energy consumption of buildings heated by floor heating. Consequently, this detail should be in focus when designing houses with floor heating.     

低温热水地板与热泵空调器采暖测试对比分析

通过对重庆地区一住宅内低温热水地板供暖系统的测试,分析对比了该系统与热泵空调采暖方式对室内热舒适性的影响及运行费用的差别,同时对地板辐射和对流散热的综合效果进行分析,表明在长江流域等非采暖地区应用地板辐射采暖的可行性及优越性。     

电地板辐射采暖系统的实测与分析(一)

通过对不同地板结构及相应不同导线间距电地板辐射采暖系统热工性能的测试分析 ,考察了该系统的稳定性和可靠性 ,并通过对全过程试验数据的处理 ,得出综合比较结果 在计算分析基础上 ,得出电地板辐射采暖系统某些特点和规律性 ;找出影响电地板辐射采暖系统效果的主要因素 ,并进一步分析这些因素是如何对电地板辐射采暖系统效果产生影响的 其结果对该类型系统的设计、施工及运行具有重要指导意义     

Overview of the Structural Design of World Trade Center 1, 2, and 7 Buildings

This paper summarizes the primary structural systems that comprised World Trade Center (WTC) 1, 2, and 7, which were destroyed in the terrorist attacks of September 11, 2001. There were four major structural subsystems in the towers: the exterior walls, the core, the floor system, and the hat truss. The major structural systems within WTC 7 were the foundation, exterior moment frames, floor system, interior columns, and column transfer trusses and girders. At the time of design and construction, the WTC towers were innovative in many ways, and resulted in a tremendous increase of open-plan commercial office space in downtown Manhattan. As the first of four papers, this paper summarizes the structural and passive fire protection features of each building, and focuses on the structural systems which played a critical role in the outcome of the attacks of September 11, 2001. Three companion papers address the effects of aircraft impact damage on the WTC towers and debris damage on WTC 7, the effects of fire on the three buildings, and how these events contributed to building collapse by describing the contribution of key structural systems to the overall building behavior and collapse, such as the floor systems and hat trusses in WTC 1 and WTC 2 and the floor connections around Column 79 in WTC 7.