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1.
结合工程实际,针对大体积防水混凝土施工,在配合比设计、原材料质量控制、混凝土浇筑工程、混凝土表面处理、混凝土温差监测及混凝土养护等方面采取了有效控制措施,以提高混凝土抗渗性能。  相似文献   

2.
某地铁钢管柱必须垂直插入柱下扩孔混凝土灌注桩中,柱下C35混凝土初凝时间必须满足钢管柱从插入灌注桩至完成的整个过程,要求混凝土初凝时间不小于36 h,终凝时间不大于42 h,属于超缓凝混凝土。本文从C35超缓凝混凝土配合比设计思路、原材料的选择与检测、基准配合比设计和对超缓凝混凝土的工作、力学等性能进行检测,得出符合该施工要求的超缓凝混凝土配合比,为以后的类似工程混凝土施工提供可借鉴的经验。  相似文献   

3.
结合南京纬三路过江通道工程N线工区C60盾构式管片高性能混凝土的制备要求,对C60高性能混凝土配合比进行了系统研究,提出C60盾构式管片高性能配合比参数的控制以及一种简易的配合比优化设计方法,应用中取得较好的效果。  相似文献   

4.
本文在多年工程实践和国内外大量研究资料的基础上,比较系统地论述了钢纤维混凝土配合比设计方法及步骤。并根据《钢纤维混凝土结构设计与施工规程》(CECS38:92)和《普通混凝土配合比设计规程》(JGJ/T56-96),考虑钢纤维掺入混凝土基体后,其拌合物的性质及强度均有不同程度的变化,因此其配合比设计与普通混凝土配合比设计及有关参数的职值也有所不同,本文对此进行了详细的论述,供工程施工参考。  相似文献   

5.
以厦门市仙岳路西段高架桥地面旧水泥混凝土路面改造工程为例,阐述了旧水泥混凝土路面的病害类型和处治方法、玻璃纤维格栅的应用、沥青混凝土加铺层类型的选用及SMA混合料配合比设计和施工.工程实践证明,上述各施工工艺和质量控制,能有效地减少反射裂缝产生,提高旧水泥混凝土路面沥青加铺层的路用性能.  相似文献   

6.
细论述了刘家道口枢纽工程刘家道口节制闸工程施工中各工艺流程:混凝土材料,混凝土配合比,混凝土拌制和输送,混凝土浇筑、养护及拆模等工艺流程及其全程质量控制.为刚刚从事水利水电工程的学子和工程技术人员提供参考.  相似文献   

7.
介绍喷射混凝土在隧道工程中的应用,并从喷射混凝土的原材料与配合比、施工设备、施工工艺三个方面进行分析,提出相应的施工质量控制途径.  相似文献   

8.
根据高强混凝土的力学性能,提出在工程中采用钢纤维高强混凝土的优越性,对钢纤维高强混凝土的原材料选择、配合比设计以及拌合、浇注等关键问题作了详尽的探讨和归纳,并对具体实例分析了钢纤维高强混凝土的配合比对性能的影响。  相似文献   

9.
结合厦门海底隧道二次衬砌混凝土施工,介绍C45高性能耐久性混凝土在海底特殊环境下的配合比设计、工作性能及施工注意事项,为类似工程的施工提供借鉴.  相似文献   

10.
结合天津市轨道交通B1线一期工程,对温带季风气候区域冬季混凝土施工质量控制措施进行了研究。为提高混凝土的抗冻性和早期强度,对配合比进行了专项设计,加入了矿物掺合料;在此基础上,对混凝土拌和、运输、浇筑、养护等过程提出了相应的控制措施,研究结果可为今后类似工程施工提供可靠的经验。  相似文献   

11.
This paper deals with the economically optimized design and sensitivity of two of the most widely used systems in geotechnical engineering: spread footing and retaining wall. Several recent advanced optimization methods have been developed, but very few of these methods have been applied to geotechnical problems. The current research develops a modified particle swarm optimization (MPSO) approach to obtain the optimum design of spread footing and retaining wall. The algorithm handles the problem-specific constraints using a penalty function approach. The optimization procedure controls all geotechnical and structural design constraints while reducing the overall cost of the structures. To verify the effectiveness and robustness of the proposed algorithm, three case studies of spread footing and retaining wall are illustrated. Comparison of the results of the present method, standard PSO, and other selected methods employed in previous studies shows the reliability and accuracy of the algorithm. Moreover, the parametric performance is investigated in order to examine the effect of relevant variables on the optimum design of the footing and the retaining structure utilizing the proposed method.  相似文献   

12.
工程项目中的时间—费用优化问题,既可以用网络计划技术进行优化,也可以利用线性规划模型求解。然而,这两种方法对一些较复杂的工程项目进行时间—费用优化时,会存在不能保证整体优化和计算量太大的问题。文章应用Excel模型对工程网络图中的时间—费用优化问题进行了研究。  相似文献   

13.
This paper presents a novel approach to find optimum locations and capacity of flexible alternating current transmission system (FACTS) devices in a power system using a multi-objective optimization function. Thyristor controlled series compensators (TCSCs) and static var compensators (SVCs) are the utilized FACTS devices. Our objectives are active power loss reduction, newly introduced FACTS devices cost reduction, voltage deviation reduction, and increase on the robustness of the security margin against voltage collapse. The operational and controlling constraints, as well as load constraints, were considered in the optimum allocation. A goal attainment method based on the genetic algorithm (GA) was used to approach the global optimum. The estimated annual load profile was utilized in a sequential quadratic programming (SQP) optimization sub-problem to the optimum siting and sizing of FACTS devices. Fars Regional Electric Network was selected as a practical system to validate the performance and effectiveness of the proposed method. The entire investment of the FACTS devices was paid offand an additional 2.4% savings was made. The cost reduction of peak point power generation implies that power plant expansion can be postponed.  相似文献   

14.
利用准精确惩罚函数法构造出价格函数,并且采用自适应遗传算法,进行电路级综合,以获得全局最优解。实验结果表明:利用本方法可以快速设计出满足性能指标的CMOS运算放大器。  相似文献   

15.
为了得到高品质的系统输出,提出了基于遗传算法的自适应控制系统的设计方法。以自适应控制器的每个控制量、状态参数、输出量等作为基因,在问题的状态空间内进行并行的启发式优化搜索,根据这些基因构成的染色体估计系统输出量。这种方法适用于非线性动态系统中多参数、多约束条件的最优控制。  相似文献   

16.
混凝土冻融耐久性的试验研究   总被引:2,自引:0,他引:2  
以混凝土冻融耐久性为研究内容,用不同种类混凝土的抗压强度、动弹性模量、超声波声速等指标的损失率来表征冻融过程中混凝土的性能劣化状况,并系统比较了不同种类混凝土的抗冻性优劣.通过研究得出:无论是普通混凝土,还是高强混凝土或高性能混凝土,其动弹模损失率、抗压强度损失率、超声波声速损失率均随冻融次数的增加而增大;提高混凝土强度在一定程度上可以提高混凝土抗冻融性能;掺入高效减水剂、优质引气剂和优质掺合料等,高性能混凝土抗冻融性能比对应的基准混凝土性能显著改善,而且通过这样的技术措施,较低强度等级的混凝土也可以获得高抗冻性.鉴于超声波测试方法方便、快捷、准确。而且可以直接用于实际工程的混凝土性能检测,所以,与动弹模测试方法相比,采用超声波测试技术来评价实际工程中混凝土的耐久性劣化程度具有明显的优势.  相似文献   

17.
This paper describes one approach to the design of reinforced concrete (RC) bridge piers, using a three-hybrid multi-objective simulated annealing (SA) algorithm with a neighborhood move based on the mutation operator from the genetic algorithms (GAs), namely MOSAMO1, MOSAMO2 and MOSAMO3. The procedure is applied to three objective functions: the economic cost, the reinforcing steel congestion and the embedded CO2 emissions. Additional results for a random walk and a descent local search multi-objective algorithm are presented. The evaluation of solutions follows the Spanish Code for structural concrete. The methodology was applied to a typical bridge pier of 23.97 m in height. This example involved 110 design variables. Results indicate that algorithm MOSAMO2 outperforms other algorithms regarding the definition of Pareto fronts. Further, the proposed procedure will help structural engineers to enhance their bridge pier designs.  相似文献   

18.
A two-stage method is developed to solve a new class of multi-storage tank multi-source (MTMS) systems. In the first stage, the optimal storage policy of each tank is determined according to the electricity tariff, and the ground-level storage tank is modeled as a node. In the second stage, the genetic algorithm, combined with a repairing scheme, is applied to solve the pump scheduling problem. The objective of the pump scheduling problem is to ensure that the required volume is adequately provided by the pumps while minimizing the operation cost (energy cost and treatment cost). The decision variables are the settings of the pumps and speed ratio of variable-speed pumps at time steps of the total operational time horizon. A mixed coding methodology is developed according to the characteristics of the decision variables. Daily operation cost savings of approximately 11% are obtained by application of the proposed method to a pressure zone of S. Y. water distribution system (WDS), China.  相似文献   

19.
结合《门式钢架轻型房屋钢结构技术规程》的相关规定,将遗传算法应用于H型钢檩条截面优化设计问题的求解,并在此基础上建立了H型钢檩条截面优化的数学模型。采用二进制编码,通过执行遗传算法的选择、交叉和变异算子,实现对H型钢檩条截面的优化设计。算例结果表明,该优化算法用于H型钢檩条截面优化设计是有效可行的。  相似文献   

20.
综述了遗传算法的基本原理和方法 ,着重讨论用遗传算法求解方程组的近似解 ,并给出了具体的实施方法  相似文献   

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