单调荷载下带加劲肋钢板混凝土剪力墙力学性能有限元分析

目的 研究一种新型带加劲肋钢板的混凝土剪力墙的力学性能.方法 利用ABAQUS有限元软件在剪力墙顶端加侧向位移,针对不同参数如轴压比,剪力墙厚度,钢板厚度等的剪力墙的力学性能进行研究,分析剪力墙的承载力和屈服位移.结果 剪力墙的承载能力随着内置于剪力墙的钢板厚度,剪力墙的厚度,轴压比,混凝土强度等级的增加而增加.带加劲肋钢板的剪力墙比普通混凝土剪力墙的承载能力和屈服位移都有很大的提高,钢板对剪力墙屈服后强度的提高有很大帮助.结论 带加劲肋的钢板内置于剪力墙中能大幅度提升剪力墙的单调荷载下的力学性能.     

水电站埋藏式加劲压力钢管的结构计算与设计优化

作者根据圆柱壳的轴对称弯曲理论,推导出地下加劲埋管结构计算的理论公式,并据此编制出地下埋管结构应力计算和设计优化程序。该程序在满足规范规定的各种约束条件下,以管壁厚度、加劲环间距、高度和厚度等作为变量,以每米钢管的总用钢量为目标函数,进行结构应力计算和工程量比较,从中选出用钢量相对最小的设计方案。计算表明:当地质条件中等,内、外水压力较大时,采用本计算方法与按规范规定的设计方法并同样进行了优化设计后的结果相比,每米钢管的用钢量可节约5%~18%左右。     

涂装柔性C形吊具的应用及分析

主要论述了柔性C形吊具的演变和发展,介绍了其结构特点和功能,并通过在具体项目中的使用以及设备工艺参数的对比,介绍了柔性C形吊具的优点,与跟其相似的输送机进行了对比和分析。     

A simple method for the inclusion of external and internal supports in the spline finite strip method (SFSM) of buckling analysis

The SFSM is an attractive numerical technique for the buckling analysis of folded-plate structures where general loading regimes and boundary conditions need to be modelled. In implementing splines as interpolation functions in the longitudinal direction of the strip, amended splines have been used conventionally to model the variety of end conditions that may occur. These amended splines are fairly difficult to implement, particularly so if internal restraints are also to be specified. A simple technique for replacing the specification of dedicated amended splines is presented in this paper. The method is then employed to study the local buckling of flat plates under longitudinally and transversely varying compression and bending with different boundary conditions at the ends.     

A simulated annealing algorithm based approach for balancing and sequencing of mixed-model U-lines

It is known that two interrelated problems called as line balancing and model sequencing should be solved simultaneously for an efficient implementation of a mixed-model U-shape assembly line in a JIT (Just in Time) environment. On the other hand, three versions of assembly line balancing problem can be identified: Type I, Type II, and Type E. There are only two articles ( Kara, Ozcan, & Peker, 2007a and Hamzadayi & Yildiz, 2012) related to simultaneous balancing and sequencing of mixed-model U-lines for minimizing the number of stations (Type 1 problem) by ignoring the fixed model sequence in the current literature. In this paper, a simulated annealing algorithm is proposed for solving a problem of type 1 by ignoring the fixed model sequence. Accordingly, simulated annealing based fitness evaluation approach proposed by Hamzadayi and Yildiz (2012) is enhanced by adding the tabu list, and inserted into the proposed algorithm. Implementation difficulties experienced in meta-heuristics based on solution modification for solving these types of problems are demonstrated. ‘Absolute deviation of workloads’ (ADW) is quite frequently used as performance criteria in the literature. It is found that ADW is an insufficient performance criterion for evaluating the performance of the solutions, and this is showed by means of an illustrative example. The parameters of the proposed algorithm are reviewed for calibrating the algorithm by means of Taguchi design of experiments. Performance of the proposed approach is tested through a set of test problems. The results of computational experiments indicate that the proposed approach is an effective method in solving simultaneous line balancing/model sequencing problems for mixed-model U-lines for minimizing the number of stations.     

设纵肋钢箱混凝土轴压短柱试验研究

为研究钢箱内填混凝土、含钢率以及钢箱内纵向加劲肋是否开孔等对钢箱混凝土轴压短柱力学性能的影响,进行了3个钢箱混凝土和1个钢箱轴压短柱的模型试验。试验结果表明：钢箱内填混凝土可有效提高试件的轴压刚度和承载力;纵肋可充分参与构件整体受力,其中纵肋开孔试件变形能力更强,延性更好。与设纵肋薄壁钢管混凝土短柱现有试验数据对比表明：随含钢率的提高,混凝土强度提高系数有所增大。建议设纵肋钢箱混凝土轴压短柱承载力可按叠加原理进行计算,其中钢箱截面积可计入纵肋的面积。     

某多层钢结构厂房垂直支撑节点设计

对越南冒溪多层钢结构发电厂工程中一垂直支撑节点进行设计,使其能满足承载力和抗震设计要求.提出一种用材经济、施工方便的连接形式,按规范验算各连接部位的可靠性.验算结果表明:提出的设计方法可靠、合理;验算项目正确、全面.     

基于材料非线性的海洋柔性立管防弯器有限元分析

建立海洋柔性立管防弯器三维有限元模型,研究聚氨酯材料非线性对防弯器弯曲性能的影响．通过算例对比不同材料属性的计算结果,发现不考虑材料非线性的计算结果与理论分析结果吻合较好．试验结果表明考虑防弯器材料非线性的立管最大曲率比不考虑材料非线性的小10％．因此,在防弯器详细分析时很有必要考虑材料非线性．     

具有加劲肋的四边简支矩形板的稳定性研究

本文利用能量原理研究了具有加劲肋的四边简支矩形板的稳定性，比较了横向与纵向设置加劲肋对板稳定性的作用。     

卧式U型夹套设备的稳定性分析和设计

对卧式U型夹套设备的内简直边段及附近过渡区的稳定性进行分析,并总结以往设计和制造这类设备的经验教训,提出两种计算公式和设计方法给设计者选择,其中还提出了必要时加强内简刚性的具体措施。对两种设计方法进行了分析比较。