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1.
采用有限元法,全过程分析了考虑长期荷载作用下时构件的应变-荷载曲线。基于有限元模型,分析了长期荷载作用下圆端形钢管混凝土柱的工作机理。结果表明:考虑长期荷载作用影响对圆端形钢管混凝土柱的内力分布、变形有较大影响,对承载力影响不大,且随着高宽比的增大,构件的峰值荷载增大,延性减小。 相似文献
2.
高子平 《福建工程学院学报》2016,(6):532-537
分析了福州市某建筑吹填土CFG桩复合地基沉降机理,通过方案比选,提出采用钢管混凝土桩加固建筑物基础的处理方案;详细介绍了钢管混凝土桩数量及布置、桩身构造设计、施工流程及工艺要求等;监测结果表明,采用钢管混凝土桩进行基础加固,对控制建筑物沉降效果显著。 相似文献
3.
Based on the characteristics of an L-shaped column composed of concrete-filled square steel tubes, the axial compression experiment and nonlinear finite element analysis were carried out to study the mechanical property of the L-shaped column. The load-displacement curve for the L-shaped column, the deflection and load-strain curves for the mono columns were obtained by the axial compression experiment. The results show that the L-shaped column exhibits a flexural-torsional buckling failure mode. The numerical simulation by the finite element analysis shows that the bearing capacity and failure mode are in accordance with those of the axial compression experiment and the feasi- bility of the finite element analysis is proved. For the calculation of the bearing capacity of the L-shaped column com- posed of concrete-filled square steel tubes, an analytical method is proposed based on the theory of the elastic stability and spatial truss model. The results of the analytical method are in good agreement with those of the axial compression experiment and the finite element analysis. 相似文献
4.
A 9-story concrete-filled steel tubular frame model is used to analyze the response of joints due to sudden column loss. Three different models are developed and compared to study the efficiency and feasibility of simulation, which include substructure model, beam element model and solid element model. The comparison results show that the substructure model has a satisfying capability, calculation efficiency and accuracy to predict the concerned joints as well as the overall framework. Based on the substructure model and a kind of semi-rigid connection for concretefilled square hollow section steel column proposed in this paper, the nonlinear dynamic analyses are conducted by the alternate path method. It is found that the removal of the ground inner column brings high-level joint moments and comparatively low-level axial tension forces. The initial stiffness and transmitted ultimate moment of the semi-rigid connection are the main factors that influence the frame behavior, and their lower limit should be guaranteed to resist collapse. Reduced ultimate moment results in drastic displacement and axial force development, which may bring progressive collapse. The higher initial stiffness ensures that the structure has a stronger capacity to resist progressive collapse. 相似文献
5.
结合实际工程,总结了三维倾斜钢管柱的制作和安装方法.采用计算机的CAD\CAM辅助设计系统对倾斜钢管柱建立三维模型,确定几何下料尺寸.利用相贯线切割机可以直接割出圆柱的多管相贯线,同时开出焊接坡口方便了后期施工.钢管柱通过塔式起重机和汽车吊采用分节安装的方法进行安装,安装时从两个方向各架设1台经纬仪以控制钢管柱外壁标记点的投影在地面作出的相应标记点上.钢管柱接口的焊接采用了平面上从中部对称地向四周扩展的焊接顺序,保证了焊接的质量. 相似文献
6.
为研究钢管高性能混凝土界面黏结性能,进行了包括钢管壁厚、截面形式、钢材类型和钢管内表面状态4 个参数的推出试验研究,分析了试件的试验现象、荷载-滑移曲线和界面黏结强度。 结果表明,仅当试件壁厚较薄时,钢管中下部会出现45°剪切滑移线;不同钢管壁厚试件的荷载-滑移曲线共有3 种增长模式,均包括胶结滑移段、滑移段和摩阻段3 个阶段;增大钢管壁厚、使钢管内表面锈蚀可以提高界面黏结强度;采用方形钢管代替圆形钢管、不锈钢管代替普通钢管对界面黏结强度有不利影响。 相似文献
7.
朱甫星 《淮南职业技术学院学报》2009,9(1):17-19,44
不锈钢光纤束管的焊接质量影响光缆的使用性能,利用涡流擦伤法检测不锈钢光纤束管焊接质量,可以有效的检测、监控不锈钢光纤束管;介绍了涡流法在线检测不锈钢光纤束管时几个重要参数的确定以及确定这些参数所采用的一般方法。 相似文献
8.
The mechanical behavior of concrete-filled glass fiber reinforced polymer （GFRP）-steel tube structures under com- bined seismic loading is investigated in this study. Four same-sized specimens with different GFRP layout modes were tested by a quasi-static test system. Finite element analysis （FEA） was also undertaken and the results were presented. Results of the nu- merical simulation compared well with those from experimental tests. Parametric analysis was conducted by using the FE models to evaluate the effects of GFRP thickness, axial compression rate, and cross sectional steel ratio. The experimental and numerical results show that the technique of GFRP strengthening is effective in improving the seismic performance of traditional concrete-filled steel tubes, with variations related to different GFRP layout modes. 相似文献
9.
Bin Rong Rui Liu Zhenyu Li Changxi Feng Guangchao You Fafitis Apostolos 《天津大学学报(英文版)》2017,23(3):258-266
Finite element analysis and parametric studies were performed to investigate the flexural capacity of the panel zone of diaphragm-through joints between concretefilled square steel tubular columns and H-shaped steel beams.Through the comparisons of failure modes,load–displacement curves,and bearing capacity,it was found that the flexural capacity of the panel zone of diaphragmthrough joints was determined by the tensile action and influence of the web of H-shaped steel beams,and the axial load should be taken into account.The steel tube and the diaphragm were the major parts of the joint that resisted the bending moment.The contribution of in-filled concrete had little influence on the flexural capacity of the panel zone of the joint and could be neglected.According to the results of these numerical studies,a formula that considered the influence of the web of H-shaped steel beams and the axial load was developed based on the yield lines in the diaphragm and the steel tube.The results of the proposed formula were in good agreement with the numerical data of this investigation. 相似文献
10.
全世海 《天津职业院校联合学报》2013,(6):109-111,120
预埋管灌浆是化学灌浆技术结合仿生自修复机理应用于混凝土裂缝修补的一种新的尝试,通过初始粘度和粘结拉伸强度测试选择适宜的环氧树脂浆液配方,采用通长配置2Ф4钢丝和壁厚1㎜中性白玻管的混凝土抗折试块作模拟灌浆试件,以抗折强度恢复率比较预埋管灌浆和传统钻孔灌浆两种不同灌浆方式的修补效果,试验结果表明:预埋管灌浆可达到甚至超过钻孔灌浆的修复效果,但要推广应用于工程实践,还有很多的技术关键有待深入研究和完善。 相似文献
11.
欧智菁俞杰林上顺王金泽 《福建工程学院学报》2019,(6):511-517
以黄桷湾特大桥为工程背景,选取轴压比、梁墩刚度比、系梁布置形式及柱肢混凝土强度等级为设计参数,应用Midas Civil有限元软件构造了20座三跨对称桥梁计算模型。研究E1地震作用下钢管混凝土双肢格构墩连续梁桥主要控制截面参数地震响应,探讨各设计参数对钢管混凝土双肢格构墩连续梁桥抗震性能的影响规律,并对全桥进行优化验证。研究结果表明:轴压比对地震作用下结构内力和位移有一定影响,建议控制在0.15~0.25;梁墩刚度比对结构的抗震性能影响较大,控制在4.08~10.90时结构的内力分布更加合理;核心混凝土的强度在C40~C50时取值较为合理。 相似文献
12.
以跨度为120m的刚性拱肋柔性系杆的下承式钢管混凝土拱桥为分析模型,利用摩擦摆减震隔震支座对简支体系的桥跨结构进行减震研究,运用MIDAS有限元软件模拟多维人工地震波输入以检验摩擦摆系统的减震效果。分析结果证明了在大跨度钢管混凝土拱桥中应用摩擦摆隔震支座系统的有效性。 相似文献
13.
某选煤厂钢结构柱脚螺栓的预埋采用钢板加固法,解决了预埋螺栓位置偏差、施工困难、工期紧的难题。 相似文献
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15.
随着钢结构的发展,钢管搭接节点应用越来越广泛.钢结构中节点受力最复杂,目前对平面K型钢管搭接节点的静力研究有很好的基础.但是在低周往复荷载下节点滞回性能的分析还比较少.采用有限元法对平面K型圆钢管搭接节点在弦杆轴向荷载作用下节点的承载力进行研究,对比分析不同几何参数与节点焊接形式下的极限承载力和破坏形式. 相似文献
16.
Shear failure in panel zones and plastic hinges in steel beams are the two major failure modes of connections between concrete-filled steel tubular(CFST) columns and steel beams. To investigate the behavior of this type of connection in both modes,two through-diaphragm connections were tested under cyclic and monotonic loadings and the load-carrying capacity,ductility,and strength of degradation of connections were discussed. Using ABAQUS software,we developed nonlinear finite-element models(FEMs) to simulate the load-carrying capacity and failure modes of the connections under monotonic loading. The finite-element(FE) analysis and test results showed reasonable agreement for the through-diaphragm connections,which confirms the accuracy of FEMs in predicting the load-carrying capacity and failure modes of connections. Based on the validated FEM,a parametric study was then conducted to investigate the infl uence of the thicknesses of the tube and diaphragm on the load-carrying capacity and failure modes of these connections. The results indicate that the strength,stiff ness,and load-carrying capacity are infl uenced less by the thickness of the diaphragm,and more by the thickness of the steel tube. According to the FE analysis results,it can be found that the critical condition between the two failure modes is determined by the shear resistance and bending resistance. 相似文献
17.
自密实钢管混凝土是将混凝土填入薄壁钢管内形成的介于钢结构与混凝土结构之间的一种新型组合结构。实际工程中如何使钢管内混凝土密实,不产生夹层、离析和气囊,是确保钢管与混凝土共同工作的关键。文章通过工程实例详细阐述了泵送顶升自密实钢管混凝土施工工艺、节点设计与连接方式,以及原材料要求与施工过程质量控制措施等,并通过工程实体检测,符合设计与工程质量要求。 相似文献
18.
通过对康庄磷化厂生产线钢结构工房3#厂房副跨改造难点进行分析,在与原有钢柱的连接问题上采用一小牛腿与原钢柱等强度焊接,再用高强度螺栓把牛腿与钢梁连接;在屋面彩板的搭接及防水问题采用将固定支架上部的彩板割开,然后将要搭接的彩板和原来的彩板在支架上部处内搭接,再在接口处用密封条封闭的方案;在柱距为16m处的柱间及屋面板衔接问题上采用矩管平面桁架。 相似文献
19.
架空直立式码头钢护筒嵌岩桩受力性状综述 总被引：1，自引：0，他引：1
以三峡库区架空直立式码头大直径钢护筒嵌岩桩为切入点,主要针对受钢护筒影响下架空直立式码头嵌岩桩的受力性状作一综述.在阐明何为钢护筒嵌岩桩的基础上综述了钢护筒及钢护筒嵌岩桩的受力性状和嵌岩桩-土-岩的受力性状的研究现状,并从钢管混凝土桩(柱)与钢护筒嵌岩桩受力性状的区别、钢护筒与桩芯钢筋混凝土的联合受力和考虑重复荷载作用下钢护筒效应对嵌岩桩承载性能的影响3个方面探讨有待研究的方向,为进一步研究钢护筒嵌岩桩提供一些思路. 相似文献
20.
C-A指派问题是实际分配任务数不仅小于总任务数,而且小于总人数,并且规定一人一事和一事一人,是一类非标准形式的指派问题.鉴于用匈牙利法求解这类非标准形式C-A指派问题的计算复杂性,给出一种新的算法,该算法首先用差值法找出可行解,然后通过行、列调整找到最优解. 相似文献