共查询到20条相似文献，搜索用时 171 毫秒
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以某混合梁斜拉桥为工程背景,分别采用Midas Civil和ANSYS建立全桥空间杆系有限元模型和钢混凝土结合段的精细实体有限元模型,进行最不利荷载组合作用下结构受力性能分析。研究表明:钢-混凝土结合段在最不利荷载组合工况下各组成部分受力均衡、变形连续协调;钢-混凝土结合段的钢箱梁应力满足要求,各钢板无屈曲现象发生;钢-混凝土结合段中混凝土箱梁节段在混凝土顶板与隔板结合部及翼缘倒角位置会出现较大的主拉应力,最大可达到4.84 MPa,超过C50混凝土抗拉强度,建议必要时应增加钢筋用量,进一步优化局部受力。 相似文献
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为了解高温气候条件下重载水泥混凝土路面结构受力特征,本文以福建省高温气候条件与重载交通特性为研究实体,采用三维有限元程序EverFE2.24计算高温气候下重载交通对路面的影响.研究结果表明,高温气候下重载交通对水泥混凝土路面造成的不利影响,降低了路面寿命.各参数对面板的受力敏感性分析结果表明,增加面板的厚度、提高地基刚度及设置传力杆,均能有效改善面板的受力性能,其中增加面板厚度带来的受力性能改善的效果最显著.此外,增大基层厚度,在减少了车辆荷载应力的同时,也增大了面板的温度应力,因此对于改善面板受力特性不一定有效. 相似文献
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空钢管桁架N型节点易发生压陷破坏,为了使杆件破坏先于节点破坏而发生,提出了在弦杆内灌浆以提高节点压陷承载力的设想.进行了8个灌浆方铜管桁架N型节点的承载力试验.基于试验结果,进行了试件的几何参数分析,研究了套箍系数、支杆间隙和支主杆边长比等参数对节点性能的影响.基于试验结果和模拟分析结果,揭示了这类节点的受力机理与破坏模式,提出了对应于不同破坏模式的节点承载力计算公式:N型受压节点及受拉节点承载力分别按弦杆压陷破坏和冲剪破坏模式进行计算;弦杆的承载力要按弦杆直剪破坏模式进行校核. 相似文献
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陈洪斌 《襄樊职业技术学院学报》2004,3(3):1-4
概述了两个钢筋混凝土梁柱中节点在低周反复荷栽作用下的试验，通过试验。分析了这两个梁柱中节点的受力机理及抗震性能，通过对这两个节点抗震性能的比较。得出了抗震节点和非抗震节点抗震性能的优劣。 相似文献
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为研究疲劳荷载对钢桁腹-混凝土组合外接式节点静力性能的影响,设计并制作了3个1∶3节点模型,分别进行了静载破坏试验和疲劳后静载破坏试验,获得了节点破坏模式、荷载-位移曲线及节点板荷载-应变曲线,研究了节点屈服荷载、极限荷载、节点刚度及延性系数等力学性能指标的变化.试验结果表明：节点板是组合节点受力关键构件,节点板破坏是外接式节点的典型破坏模式;疲劳荷载对节点屈服前的受力性能影响较小,但对节点屈服后的受力性能影响显著;与仅承受静载的试件相比,未疲劳破坏试件的极限承载力减小4%,延性系数减小28%,有疲劳破坏试件的极限承载力减小25%,延性系数减小52%;疲劳裂纹引起了节点板应力重分布,增大了无疲劳裂纹区域的应变,且应变增长率随着与疲劳裂纹距离的增加而减小. 相似文献
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本文以三跨预应力混凝土连续槽型梁顶推施工为工程背景,在顶推前对槽型梁进行顶升模拟试验,用以检验顶推过程中导梁与混凝土连接处、槽型梁关键截面的受力是否安全。首先通过Midas/Civil有限元软件建立桥梁模型,对顶推进行全过程施工仿真计算,确定桥梁顶推过程中最不利工况,在此基础上通过顶升加载模拟最不利工况下的梁体受力,通过试验过程中的变形、应力监测,将实测值与理论计算值对比分析,结果表明前导梁、槽型梁具有足够的刚度、强度安全储备,且结构基本处于弹性工作状态,整个顶升试验的顺利实施可为类似顶推桥梁施工提供实践参考。 相似文献
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“杆”的平衡是静力学中常见的模型之一,其一般问题的求解要用到转动物体的平衡条件——力矩的代数和等于零。但有一类常称“三力杆”的平衡,在解决有些问题时可化受力“杆”为受力“点”,从而只用共点力的平衡条件即可。 所谓“三力杆”,指的是杆状刚体只有三点受力(注意不一定只有三个力)且各点受力满足:①在同一平面内;②互不平行。由于在同一平面内的三个非平行力平衡时,三力的作用线必交于一点,所以,“三力杆”要平衡,三点受力“必共点”,这就是化“杆”为“点”的理论根据,或叫“三力杆”的平衡条件,具体运用步骤为: 相似文献
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轻杆受力问题历来是教学的难点．同学们认为：杆的受力必定沿杆的方向,即使知道不一定沿杆的方向,也感到难以确定其大小和方向,在此笔者就轻杆受力问题做以下探讨． 相似文献
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钢管混凝土柱-环扁梁中节点静载试验研究 总被引：5，自引：0，他引：5
介绍了钢管混凝土柱-钢筋混凝土环扁梁中节点的构造和基本受力机理,以及环梁、环扁粱节点的静载试验结果.试验结果表明,通过合理设计,环梁、环扁梁节点能有效地传递框架梁、扁梁梁端的剪力和弯矩,具有良好的变形能力. 相似文献
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介绍了钢管混凝土柱-环梁中节点(环梁节点)在静载和低周反复荷载作用下的设计方法,其可靠性得到试验数据的证实。结果显示,在地震区推广应用钢管混凝土柱-钢筋混凝土环梁节点的结构体系具有较强的可行性。 相似文献
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Recent research has shown that circular hollow section (CHS) joints may exhibit non-rigid behavior under axial load or bending.
The non-rigid behavior significantly affects the mechanical performance of structures. This paper is concerned with the parametric
formulae for predicting axial stiffness of CHS X-joints while braces are in tension. The factors influencing the axial stiffness
of CHS X-joints under brace axial tension are investigated, including the joint geometric parameters, the axial force of the
chord, and bending moments of braces in two directions, etc. Effects of various parameters on axial stiffness of CHS X-joints
are examined by systematic single-parameter nonlinear analysis using shell finite element methods. The analysis is implemented
in a finite element code, ANSYS. The observed trends form the basis of the formulae for calculating the joint axial stiffness
under brace axial tension by multivariate regression technique. In order to simplify the formulae, two non-dimensional variables
are introduced. The proposed formulae can be used to calculate the joint axial stiffness in the design of single-layer steel
tubular structures. 相似文献
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Behavior of axially loaded tubular X-joints using bolted connection: mechanical model and validation
Yong Chen Ji-yang Wang Yong Guo Guo-hui Shen Li-xian Yang Bin-nan Sun 《浙江大学学报(A卷英文版)》2013,14(12):880-889
X-joints are one of the fundamental joint configurations used in a wide range of transmission tubular structures. Experimental investigation of lbur tubular X-joints with bolted connection was conducted in this study, and it was found that the annular plate was the main yielding control member of such X-joints. Moreover, the portion outside the effective width of the chord member still had a restriction effect on the annular plate, which led to reducing the yielding strength of the joint, while the gusset plate could help to improve the yield strength capacity. In the current design code of steel structures, the contribution to the strength capacity of the gusset plate has not been taken into account. Therefore, based on some mechanical assumptions, a general mechanical model was proposed. After the introduction of the gusset plate strength capacity factor, the yield capacity simplified calculation method of such X-joints was derived. Through the analyses of such X-joints with various diameters and thicknesses, it was concluded that a simple mechanical model could predict test results very well and that the contribution of the gusset plate was also taken into account. 相似文献
14.
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
15.
傅鹏斌 《河北职业技术学院学报》2010,(1)
论述了目前钢管混凝土柱节点的常见型式,分析了加强环式节点、穿心牛腿环梁节点、钢筋贯通式刚接节点、锚定式节点、十字板式节点、分层式节点和环梁式节点的构造特点和各自的优缺点。指出钢管混凝土柱节点在理论研究和实际应用中的一些问题。 相似文献
16.
Dynamic response of RPC-filled steel tubular columns with high load carrying capacity under axial impact loading 总被引：3，自引：0，他引：3
Experimental investigation into impact-resistant behavior of reactive powder concrete (RPC)-filled steel tubular columns was conducted,and dynamic response of the columns under axial impact loading was studied by means of numerical simulation method.Increase coefficient of load carrying capacity and ratio of load carrying capacity between steel tube and RPC core of col-umns were obtained. 相似文献
17.
利用锈层稳定化处理的耐候钢焊接接头,进行了大气曝晒(喷淋)加速试验,结果证明:经表面复合处理剂处理后的Q450NQR1耐候钢,腐蚀率显著降低,不仅提高了耐蚀性,而且也提高了抗局部腐蚀能力。经表面复合处理剂处理的焊接接头与非焊接样的腐蚀试验结果没有差别,说明表面复合处理剂适用于焊接接头的锈层稳定化处理。 相似文献
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In order to evaluate the seismic behavior of confined RC column-composite beam joints, five interior joints were tested under low cyclic reversed load. The weakening extent of flanges, the number of studs, and whether to reinforce weakened flanges were used as parameters in designing these five joints. Failure characteristics, hysteretic curves, skeleton curves, ductility, energy dissipation, strength degradation, and stiffness degradation were analyzed. The test results revealed that the steel beam flanges in the joints were equivalent to the tie rod. Weakened flanges resulted in poor seismic behavior; however, the seismic behavior could be improved by increasing studs and reinforcing weakened flanges. The joint steel plate hoops, equivalent to stirrups, did not yield when the maximum load was reached, but yielded when the failure load was reached for the joints with shear failure. Increasing stud-type joints and reinforcing flange-type joints ensured good seismic behavior and met project requirements. Based on the experimental results, the failure mechanism of the joints was discussed, and the shear capacity equations of the joints was presented. 相似文献
19.
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
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X100管线钢屈服强度在690MPa以上,为了实现钢管埋弧焊缝的高强度高韧性匹配,研制了与X100管线钢相匹配的WS01焊丝,该焊丝匹配大西洋CHF105焊剂,焊接接头抗拉强度810MPa,20℃冲击功,焊缝的弯曲、硬度实验结果均达到AP15L钢管标准要求。 相似文献