共查询到20条相似文献，搜索用时 31 毫秒
1.
The National Swimming Center built for the 2008Beijing Olympic Games applies the polyhedron spatialframe structure, which is based on the foam physicstheory[1]. Its simple geometry is a square box of 170m×170 m×29 m. It can hold 17 000 people, theroof o… 相似文献
2.
陈培旭张铮冯若若 《福建工程学院学报》2021,(3):268-274
以顶底角型件高强螺栓连接铝合金梁柱节点为研究对象,利用有限元软件建立数值模型,并根据试验实测数据验证了有限元的准确性。探讨了轴压比、节点域厚度和顶底角型件厚度对节点力学性能的影响。对算例计算所得弯矩-转角曲线进行分析,拟合回归了三参数模型中形状系数的近似解析公式。结果表明,节点在合适的轴压比、节点域厚度和顶底角型件厚度下能表现出良好的抗震性能。提出的形状系数近似计算公式较为准确可靠,可为实际工程的连接设计方法提供理论依据。 相似文献
3.
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
4.
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
5.
采用有限元分析方法考察梁和柱的截面尺寸、角型连接件尺寸、铆钉直径及端距等对节点性能的影响,根据计算得到的弯矩-转角曲线拟合出三参数模型中形状系数n 值的近似计算公式。结果表明,柱翼缘厚度和角型件厚度对节点初始刚度和极限承载力影响显著,梁高和铆钉端距的影响次之。形状系数建议公式计算结果与试验结果吻合较好,可为该类连接节点设计方法提供理论依据。 相似文献
6.
The reinforcement effect of a reconstruction scheme for a steel factory building was investigated using finite element method and dynamic performance test. The workshop concerned is a portal frame structure with four spans and two slope roofs, of which ten columns need cutting for expanding span. The design and reconstruction pro- ject of column-cut supported by joist were introduced, which includes column reinforcement, connection rebuilding between brackets and crane beams, and the changing of rigid joint into hinge joint. The construction scheme was put forward in the light of the characteristics of the reinforcement and reconstruction. Spot test of dynamic performance on the workshop and comparison with theoretical analysis results show that the column-cut supported by joist design is effective and the reconstruction project is successful. 相似文献
7.
介绍了桥式起重机主梁设计的计算方法及校核过程。应用有限元软件建立主梁三维模型,并针对主梁进行了静力学分析。为保障主梁结构的可靠性,将主梁与端梁装配成桥架,建立了桥架整体模型,并进行了静态分析和模态分析,在确认桥架设计合理的基础上提出了改进方案。 相似文献
8.
为客车车身结构接头的设计提供理论依据,应用有限元法,通过ANSYS软件分析了接头角板对客车平面框架结构承载性能的影响,并对计算结果进行对比.结果证明,在垂直弯曲载荷下,接头处添加角板对客车平面结构承载能力影响不大;在扭转载荷下,接头处添加角板能够有效提高客车基本平面结构的承载能力. 相似文献
9.
A new energy harvester using a piezoelectric and suspension electromagnetic mechanism 总被引：1，自引：0，他引：1
This study presents a new design of a piezoelectric-electromagnetic energy harvester to enlarge the frequency bandwidth and obtain a larger energy output. This harvester consists of a primary piezoelectric energy harvesting device, in which a suspension electromagnetic component is added. A coupling mathematical model of the two independent energy harvesting techniques was established. Numerical results show that the piezoelectric-electromagnetic energy harvester has three times the bandwidth and higher power output in comparison with the corresponding stand-alone, single harvesting mode devices. The finite element models of the piezoelectric and electromagnetic systems were developed, respectively. A finite element analysis was performed. Experiments were carried out to verify the validity of the numerical simulation and the finite element results. It shows that the power output and the peak frequency obtained from the numerical analysis and the finite element simulation are in good agreement with the experimental results. This study provides a promising method to broaden the frequency bandwidth and in- crease the energy harvesting power output for energy harvesters. 相似文献
10.
Thelevel of vibration and noiseis animportant estima-tionindexoninternal combustionengines .As vibrationandnoise legislations are continually introduced and progres-sivelyrestricted,lowerlevel noise becomesincreasinglyim-portant .The traditional design pe… 相似文献
11.
A new contraction joint element model for the interface in different meshes between the arch dam sections is con- structed. The study on the elastic-plastic damage constitutive model for concrete, which is applied to multi-axial stresses, is also taken. The models of the dam-foundation-reservoir system for Xingbiling and Jinping concrete arch dams, China are calculated using the proposed contraction joint elements and the elastic-plastic damage constitutive model to verify the proposed models. Results showed that the proposed contraction joint element model has a high precision in simulating the behavior of contraction joints and the elastic-plastic damage constitutive model has a high precision in simulating the behavior of the damage to the concrete. 相似文献
12.
13.
基于平面桁架有限元分析的基本原理,利用MATLAB软件对某平面桁架编制了计算程序,得到了结构的内力计算结果、变形图和结构的动力特性,并将计算结果与ANSYS有限元分析软件的结果进行比较.结果表明,二者的计算结果一致.利用MATLAB可以编制结构有限元分析程序,计算速度快,数据准确,并能为复杂结构有限元分析提供参考. 相似文献
14.
JRC-JCS模型在抗剪强度参数取值中的应用 总被引：3，自引：0，他引：3
工程岩体的失稳几乎都是沿着结构面发生的。而岩体结构面的抗剪性质并不完全满足莫尔一库仑准则，因此在岩质边坡的稳定性分析中采用莫尔一库仑准则有可能会带来较大误差。本文简要的回顾了岩体结构面抗剪强度估算方法发展的历程，提出了基于JRC-Jcs模型计算等效抗剪强度参数的概念和方法，并通过简单计算实例阐明了这一方法在处理实际工程问题中的特点。 相似文献
15.
利用有限元程序MIDASCivil建立了装配式预应力混凝土空心板桥整体计算模型并进行计算,通过对比分析装配式预应力板桥在重做铺装、粘贴钢板和施加横向预应力的荷载横向分布影响线降低幅度、变化趋势,其中,着重分析了施加横向预应力之后的加固效果。有限元模型分析的结果表明,施加横向预应力效果最好,可达到治本效果。 相似文献
16.
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
17.
黄玉宁郑永乾赖鹏松 《福建工程学院学报》2020,(4):329-335
采用有限元软件ABAQUS建立了不同加载角T形带肋和多室钢管混凝土压弯构件的计算模型,数值计算结果与试验结果吻合良好。对影响T形钢管混凝土柱水平荷载P-水平位移Δ关系曲线的参数进行分析,结果表明:加载角为0°时,T形钢管混凝土构件的承载力最低,在67.5°负向加载时,构件的承载力最大,比0°加载角构件大13%左右,加载角为45°~90°间承载力总体上差别不大。随着钢管屈服强度、混凝土抗压强度、钢管长厚比、带肋和多室T形钢管混凝土构件在斜向加载的承载力增加,在传统钢管混凝土基础上,提出了适用于不同加载角带肋和多室T形钢管混凝土压弯构件的承载力设计方法,简化计算公式与有限元结果、试验结果均吻合较好。 相似文献
18.
Calculation Model of Equivalent Strength for Induced Crack Based on Double-K Fracture Theory and Its Optimizing Setting in RCC Arch Dam 总被引：2，自引：0，他引：2
By means of fracture testing on roller-compacted concrete (RCC) three-point bending beams with two different specimen sizes, the P-CMOD complete curve for RCC was gained. Furthermore, by applying double-K fracture theory, KIC^ini,KIC^un, as well as the critical effective crack length and the critical crack tip opening displacement, were evaluated. Based on the double-K fracture parameters above, the calculation model of equivalent strength for induced crack was established, thus the calculation method on its initiation, stable propagation and unstable fracture was ascertained. Moreover, the finite element simulation analysis of stress field in ShaPai arch dam and the on-site observational splaying points of induced crack at different altitudes validated the reliability of the model. Finally, crack inducer‘s optimal setting in RCC arch dam was studied. It improves the design level of induced crack in RCC arch dam and satisfies the necessity of engineering practice. 相似文献
19.
钢筋混凝土屋面悬挑屋檐结构的有限元分析 总被引：1，自引：0，他引：1
结合工程实际,在钢筋混凝土屋面飘板结构设计中,对其悬挑屋檐方案安全问题采用有限元方法进行计算和分析,结果显示,悬挑屋檐板的最大跨度应取4.8m,梁按变截面设计并不增加悬挑屋檐板的最大位移,在悬挑屋檐板端部内增设几道钢筋,可使悬挑屋檐板的端部位移和应力均匀. 相似文献
20.
复合悬臂曲梁力学性能的研究 总被引：1，自引：0，他引：1
用有限元方法对复合悬臂曲梁进行了数值分析,求得了复合悬臂曲梁的正应力和切应力。设计并制作了复合悬臂曲梁的实验模型并进行了应力测试,将两者结果与解析解进行比较,进一步验证了复合曲梁的理论公式的正确性,此举也为高校有关复合曲梁的开放性实验提供了一些参考。 相似文献