压型钢板组合梁在负弯矩作用下的抗弯承载力分析

连续组合梁在内支座处的负弯矩区段会出现混凝土板受拉、钢梁受压的不利局面。为了解组合梁在负弯矩作用下的受力性能 ,并为有关连续组合梁的进一步研究提供依据 ,对压型钢板组合梁在负弯矩作用下的抗弯性能进行了试验研究。结果表明 ,按照简化塑性方法计算压型钢板组合梁截面在负弯矩作用下的抗弯承载力与试验结果吻合很好 ;在其他参数不变的情况下 ,纵向钢筋配筋量对梁的延性、滑移及裂缝等都有较大的影响 ;此外 ,压型钢板对组合梁抗弯承载力的提高作用有限 ,设计时可以忽略不计。     

Performance of shear connection in composite beams with profiled steel sheeting

This paper describes the structural performance of shear connection in composite beams with profiled steel sheeting. An accurate and efficient nonlinear finite element model was developed to study the behaviour of headed stud shear connectors welded through-deck. The profiled steel sheeting had transverse ribs perpendicular to the steel beam. The material nonlinearities of concrete, headed stud, profiled steel sheeting, reinforcement and steel beam were included in the finite element model. The capacity of shear connection, load-slip behaviour of the headed stud, and failure modes were predicted. The results obtained from the finite element analysis were verified against experimental results. An extensive parametric study was conducted to study the effects on the capacity and behaviour of shear connection by changing the profiled steel sheeting geometries, the diameter and height of the headed stud, as well as the strength of concrete. The capacities of shear connection obtained from the finite element analysis were compared with the design strengths calculated using the American Specification, British Standard and European Code for headed stud shear connectors in composite slabs with profiled steel sheeting perpendicular to the steel beam. It is found that the design rules specified in the American and British specifications overestimated the capacity of shear connection, but the design rules specified in the European Code were generally conservative.     

钢-闭口型压型钢板轻骨料混凝土组合梁受力性能试验研究

完成了8个钢-闭口型压型钢板轻骨料混凝土组合梁试件的静力试验,对组合梁受力性能进行了研究。试验中详细考察了钢-闭口型压型钢板轻骨料混凝土组合梁在不同名义剪跨比、不同栓钉布置形式下的受力过程、裂缝发展、破坏形态和型钢、钢板与混凝土应变发展过程、跨中弯矩与跨中挠度以及型钢与组合板端部滑移发展情况;根据对试验结果与现行规范所建议方法计算结果的对比分析,提出了钢-闭口型压型钢板轻骨料混凝土组合梁的受弯承载能力以及受剪承载能力计算方法。研究结果表明,钢-闭口型压型钢板轻骨料混凝土组合梁试件的破坏形态主要表现为弯曲剪切破坏,组合梁具有较好的承载能力和延性,在80%Pu后,组合梁界面才表现出明显的滑移现象,截面不满足平截面假定。研究还表明,即使组合梁试件按照我国现行规范计算所得连接程度较小时,也具有较高的受弯承载能力。同时,为考察组合梁动力特性,对8个组合梁试件的前三阶自振频率和阻尼比进行了试验测试,测试结果表明组合梁阻尼比较     

钢-压型钢板混凝土组合梁的极限负弯矩强度

组合梁的抗剪连接程度是影响组合梁极限承载能力的重要因素。为此 ,推导了压型钢板混凝土组合梁负弯矩强度计算公式 ,讨论了采用线性内插法的简化计算方法 ,分析了影响负弯矩强度计算的剪力连接程度     

多跨连续压型钢板承载力的近似计算

提出了一个估算多跨连续压型钢板极限承载力的近似方法,即拟简单塑性铰方法。该方法考虑了连续压型钢板中的弯矩重分布,能够较为准确地估算多跨连续压型钢板的承载力。与已有文献中的试验相比,该方法估算的承载力是偏于安全的。由该法还得到了估算这种压型钢板在均布荷载下的承载力的显式,便于实际应用。     

闭口型压型钢板——混凝土组合板承载能力试验研究

闭口型压型钢板—混凝土组合板中,压型钢板能更好地起到受拉钢筋的作用,比开口型压型钢板—混凝土组合板有更多性能优势和更好的应用前景。通过八块采用新型BONDEKⅡ型闭口型压型钢板的组合板的静力性能试验研究和理论分析,着重考察剪跨比和组合板端部栓钉布置对组合板受力性能、破坏形态和极限承载能力的影响,提出了该类闭口型压型钢板的组合板的受弯承载力、竖向受剪承载力和纵向剪切粘结破坏承载力的计算方法及公式,为组合板设计计算提供依据。     

Behaviour of headed stud shear connectors for composite steel-concrete beams at elevated temperatures

The behaviour of composite steel-concrete beams at elevated temperatures is an important problem. A three-dimensional push test model is developed herein with a two-dimensional temperature distribution field based on the finite element method (FEM) and which may be applied to steel-concrete composite beams. The motivation for this paper is to increase the awareness of the structural engineering community to the concepts behind composite steel-concrete structural design for fire exposure. The behaviour of reinforced concrete slabs under fire conditions strongly depends on the interaction of the slabs with the surrounding elements which include the structural steel beam, steel reinforcing and shear connectors. This study was carried out to consider the effects of elevated temperatures on the behaviour of composite steel-concrete beams for both solid and profiled steel sheeting slabs. This investigation considers the load-slip relationship and ultimate load behaviour for push tests with a three-dimensional non-linear finite element program ABAQUS. As a result of elevated temperatures, the material properties change with temperature. The studies were compared with experimental tests under both ambient and elevated temperatures. Furthermore, for the elevated temperature study, the models were loaded progressively up to the ultimate load to illustrate the capability of the structure to withstand load during a fire. It is concluded that finite element analysis showed that the shear connector strength under fire exposure was very sensitive. It is also shown that profiled steel sheeting slabs exhibit greater fire resistance when compared with that of a solid slab as a function of their ambient temperature strength.     

钢-压型钢板混凝土连续组合梁调幅系数的试验研究

为了研究钢 压型钢板混凝土连续组合梁的受力性能,对 3根两跨钢 压型钢板混凝土组合梁进行了试验研究。试验结果表明,通过控制力比 R,压型钢板组合梁支座负弯矩区具有足够的塑性转动能力和延性,能够保证连续梁形成充分的塑性内力重分布。同时,根据现有的试验结果和理论分析,推导了连续组合梁负弯矩调幅限值的计算公式,计算结果与试验值符合良好。据此,对连续组合梁的负弯矩调幅系数提出了建议。     

钢-压型钢板混凝土组合梁极限抗弯承载力的研究

本文在推导钢 压型钢板混凝土组合梁极限抗弯承载力计算公式的基础上,验证了简化计算方法的可行性。通过对笔者完成的 5根钢 压型钢板混凝土组合梁试验结果的计算分析,提出栓钉间距对其抗剪承载力的影响系数β。本文公式计算结果与国内外 26根试验梁的实测值吻合良好。根据本文研究成果,可以很方便地得到考虑钢 压型钢板混凝土组合梁组合作用的极限抗弯承载力。     

内配型钢矩形钢管混凝土轴压短柱生命周期内的力学性能

为了研究内配型钢矩形钢管混凝土轴压短柱在生命周期内的受力机理,利用有限元软件ABAQUS建立该类短柱的计算模型,并与已有的相关试验结果进行对比。模型中将钢管初应力和长期荷载作为生命周期内的主要因素进行考虑,分析了内配型钢矩形钢管混凝土轴压短柱生命周期内的荷载-变形全过程曲线、跨中截面各部件纵向应力分布和钢材与混凝土之间的相互作用力; 考察了初应力系数、长期荷载比和含钢率对构件承载力和变形的影响规律。结果表明:考虑钢管初应力和长期荷载作用的内配型钢矩形钢管混凝土轴压短柱极限承载力与一次加载情况下相比变化不明显,但极限承载力对应的纵向应变增长84.2%; 在长期持荷阶段,核心混凝土发生卸载现象,其承担的荷载下降了30%左右,再加载阶段又继续承载; 钢管与混凝土之间的接触应力在中截面处最大,沿构件长度方向逐渐向两端减小; 随着钢管含钢率增大,构件极限承载力增大,变形减小,而型钢含钢率对构件变形影响较小; 随着初应力系数和长期荷载比的增大,构件纵向变形增大。     

压型钢板组合楼板承载力的有限元分析

压型钢板组合楼板是 2 0世纪发展起来的一种新型结构形式。它具有显著的优势 ,如轻质、高强 ,施工快捷等 ,将在未来的建筑领域中大有作为。组合楼板的承载力主要取决于钢板 -混凝土界面处的抗剪强度。建立了一个二维有限元模型来研究单向组合板的性能。并将计算结果与试验数据进行对比 ,验证了模型的有效性     

闭口型压型钢板-混凝土组合板疲劳性能试验研究

为研究闭口型压型钢板-混凝土组合板的疲劳性能,完成14块闭口型压型钢板-混凝土组合板的疲劳试验研究。试验主要考察组合板端部栓钉布置、组合板板厚、疲劳荷载水平及组合板加载剪跨比等4个主要因素对组合板疲劳破坏模式及疲劳损伤程度的影响。试验过程中对组合板在各个关键阶段的动挠度、动滑移、压型钢板及混凝土应变、组合板残余挠度及组合板剩余承载能力等参数进行测量和分析。在试验研究基础上,根据组合板疲劳破坏形态及损伤发展情况,着重对组合板的疲劳性能进行较全面研究,初步提出组合板疲劳性能水平评估方法及组合板疲劳设计建议。试验研究结果表明,无栓钉组合板的疲劳性能明显差于带栓钉组合板,布置栓钉可大大提高组合板疲劳性能;无栓钉组合板的设计疲劳荷载上限可以取为40%的静力极限荷载,而带栓钉组合板的设计疲劳荷载上限可以取为60%的静力极限荷载。研究结果为闭口型压型钢板-混凝土组合板疲劳设计计算提供有利依据。     

闭口型压型钢板-混凝土组合板数值模态分析研究

目前,压型钢板-混凝土组合板结构在工业厂房和电厂中得到广泛应用,其组合板振动特性也日渐为业主和设计人员所关注。利用ANSYS有限元分析程序对闭口型压型钢板-混凝土组合板进行数值模态分析,得到组合板各阶自振频率及振型。对模态分析过程中所涉及到的材料模型定义、单元划分以及建模技术等问题进行了详细介绍,数值模拟结果与组合板模态试验结果比较吻合,表明所采用的有限元模态分析方法能较准确模拟组合板的振动特征。进一步运用ANSYS程序对一系列不同跨度和边界条件下的组合板进行数值模态分析,得到不同跨度和边界条件下组合板的振型和自振频率,为组合板的振动设计提供有益的参考和依据。     

宝冶U76压型钢板-混凝土组合楼板纵向抗剪承载力试验

宝冶U76压型钢板为带压痕开口槽形板,端部焊接栓钉来提高压型钢板-混凝土组合楼板间的纵向抗剪承载力。通过该压型钢板-混凝土组合楼板的加栽试验,得到该组合楼板的压型钢板与混凝土间相对滑移与荷载的关系曲线。根据不同厚度、不同剪跨下8块试件的关系曲线,采用线性回归方法得到U76压型钢板-混凝土组合楼板的纵向抗剪剪力粘结系数,从而确定该种组合楼板的纵向抗剪承载力计算公式。     

按部分剪力连接计算压型钢板-混凝土组合板承载力的简化方法

提出多种荷载作用下,简支压型钢板-混凝土组合板承载力的部分剪力连接简化计算方法。分析组合板纵向剪切破坏的部分剪力连接理论模型,阐明组合板纵向剪切破坏的机理,以及控制截面位置和极限荷载的求解思路。通过公式推导,分别得到了组合板在两点对称荷载和均布荷载作用下的承载力计算公式。在此基础上,提出点荷载和均布荷载共同作用下的组合板承载力计算方法,通过参数分析,对该方法进行简化,得到多个荷载作用下组合板承载力的简化计算公式。结合12个简支组合板的静力试验结果,进行公式验证,计算结果与试验值吻合良好。通过小比例滑块试验得到压型钢板与混凝土的界面强度参数,即可用该方法计算组合板的承载力。     

压型钢板组合梁滑移性能的有限元分析

利用ANSYS有限元软件对压型钢板组合梁模型进行了有限元数值模拟分析,将有限元分析结果与试验结果进行了比较,验证了模型的合理性,利用ANSYS软件对压型钢板组合梁在栓钉布置方式和混凝土板强度影响下交界面的滑移性能进行了探讨.     

Experimental and finite element study of profiled steel sheet dry board folded plate structures

Folded plate structures constructed with profiled steel sheeting connected to dry boards by self drilling, self tapping screws (known as the PSSDB system) are being proposed as an alternative to traditional forms of roof construction. This paper describes the analysis, testing, and the structural behaviour of such kind of structures. The proposed efficient and load bearing structural system consists of an assembly of individual PSSDB panels connected by steel angle plates at the ridges, formed to the required shape, width and span. An analytical model using finite element method has been proposed. The profiled steel sheeting was idealised as an equivalent homogeneous orthotropic thin shell plate elements of constant thickness. Two directional plate elements were proposed in modelling the connection between profiled steel sheeting and dry board to include biaxial shear deformation. The proposed analytical method has been used to analyse the results of full-scale folded plate PSSDB tests and is found to give good results.     

Local buckling behaviour of trough girders composed of an assemblage of profiled steel sheets

The local buckling behaviour of profiled trough girders in bending, made from cold formed profiled steel sheeting and used for profiled composite beams, is studied using an elastic finite strip method. The simplified method assumes that there is no shear stress present within the buckling half-wavelength, and is thus applicable to the uniform bending case where no moment gradient exists. Three typical types of profiled steel sheeting configurations are studied in the form of profiled trough girders, and these are investigated comparatively. The variation of the elastic local buckling coefficient with the cross-sectional parameters is demonstrated for each of the three typical rib shapes. An example of the local buckling of a typical profiled through girder is given.     

钢-闭口型压型钢板轻骨料混凝土组合梁弯曲刚度研究

完成了8个钢-闭口型压型钢板轻骨料混凝土组合梁试件的静力试验,对组合梁弯曲刚度计算方法进行研究。分别介绍了换算截面刚度法、考虑滑移的刚度折减法及修正折减刚度法这三种目前常用的组合梁刚度计算方法,并采用刚度折减法和修正折减刚度法计算了8个组合梁试件的刚度及跨中变形,并与试验结果进行比较分析,最终根据分析结果对组合梁的刚度计算方法提出建议。     

压型钢板-混凝土组合楼板剪切粘结性能研究

为研究YX75-200-600和YX76-344-688压型钢板-混凝土组合楼板的剪切粘结承载力和剪切粘结性能,进行了18块足尺寸简支压型钢板-混凝土组合楼板的载荷试验,并进行了相关的分析。试验结果表明:18个试件的破坏形态均为剪切粘结破坏,影响剪切粘结性能的主要因素有剪跨、压型钢板厚度和栓钉。由试验数据分析得到的端部有栓钉YX75-200-600压型钢板-混凝土组合楼板的剪切粘结系数m,k为228.12,-0.015,YX76-344-688压型钢板-混凝土组合楼板的剪切粘结系数m,k为246.9,-0.0028。