国际期刊导读

1部分混凝土外包波形钢腹板组合工字梁的抗剪性能试验研究 摘要：针对提高负弯矩作用下连续梁的结构特性提出了一种新型的部分混凝土外包波形钢腹板组合工字梁。对这种混凝土外包组合工字梁在对抗荷载下的抗剪性能进行试验分析研究。     

波形钢腹板预应力混凝土组合箱梁结构在中国桥梁工程中的应用

介绍了波形钢腹板预应力混凝土(PC)组合箱梁桥中波形钢腹板的设计方法,给出了中国在建和已建的该类桥梁结构中波形钢腹板的抗剪屈曲界限图,总结了中国在这种桥梁中所使用的几种抗剪连接件形式,并介绍了2种新型的抗剪连接件及2007年以来中国在建的4座波形钢腹板PC组合箱梁桥的结构及其特点,为今后这种结构的桥梁建设提供了有益的参考.     

波形钢腹板组合刚构桥墩-梁结合部受力性能试验研究

由波形钢腹板组合梁和钢筋混凝土桥墩所构成的组合刚构桥,可以综合组合结构与刚构桥的优势,具有跨越能力强、长期性能好和施工方便等优势,是适用于高烈度地震区大跨桥梁的一种新型结构形式。本文对波形钢腹板组合梁刚构桥墩梁结合部以及墩顶位置组合梁负弯矩区的受力性能进行了试验研究。试验表明,此类墩-梁固结节点具有良好的承载力、刚度、耗能能力、延性以及变形恢复能力,抗震性能良好;波形钢腹板组合梁负弯矩区开裂荷载较高,裂缝分布较均匀,抗剪连接件性能可靠,正应力横向分布均匀。同时,还分析了腹板内衬混凝土对截面正应变分布的影响以及波形钢腹板在不同荷载水平下对组合梁抗剪强度的贡献,并建议了波形钢腹板在节点区混凝土内的锚固深度。     

波形钢腹板-钢管混凝土桁式弦杆组合梁抗扭性能研究

以波形钢腹板-钢管混凝土桁式弦杆组合梁为研究对象，开展抗扭性能试验和理论分析，并与波形钢腹板-钢管桁式弦杆组合梁和波形钢腹板-钢管混凝土弦杆组合箱梁抗扭性能进行对比；研究波形钢腹板-钢管混凝土桁式弦杆组合梁的扭曲破坏形态、截面类型、管内混凝土对组合梁抗扭性能的影响，并探讨波形钢腹板-钢管混凝土桁式弦杆组合梁抗扭承载能力计算方法。结果表明，波形钢腹板-钢管混凝土桁式弦杆组合梁可等效为闭口箱形截面。扭曲破坏形态为混凝土桥面板沿与梁轴线呈45°方向斜向开裂，且纵向钢筋发生屈服。管内混凝土对组合梁抗扭刚度和抗扭承载能力具有一定的贡献度。基于线性刚度叠加方法，提出钢管混凝土组合抗扭刚度计算方法。根据波形钢腹板-钢管混凝土桁式弦杆组合梁可能发生的四种扭曲破坏形态，提出波形钢腹板-钢管混凝土桁式弦杆组合梁抗扭承载能力计算方法，并将采用该文所提出的组合梁抗扭承载能力计算方法得到的理论计算结果与试验和有限元分析结果进行对比，误差不超过8.5%。     

腹板嵌入式组合梁中抗剪连接件推出试验

提出一种节省钢材且具有较高受剪承载力的新型组合梁--腹板嵌入式钢-混凝土组合梁,它是将倒T形钢梁腹板上部开槽,嵌入到混凝土翼板中形成的组合梁。通过10个推出试件的试验,研究腹板嵌入式组合梁中钢板连接件的受剪承载力。推出试验结果表明,连接件的受剪承载力随混凝土强度等级、钢板厚度增加而提高。基于试验结果,通过参数回归分析,拟合出嵌入式组合梁连接件受剪承载力计算公式,并提出连接件的构造要求。通过与普通组合梁中栓钉连接件受剪承载力的比较表明,腹板嵌入式钢-混凝土组合梁中钢板连接件具有承载力高、易于实现完全抗剪连接的优点,而且连接件抗剪连接刚度大,可以减少组合梁由于滑移效应引起的刚度折减。     

波形钢腹板PC组合箱梁在玉春桥中的应用研究

针对一座波形钢腹板PC组合箱梁桥——玉春车行天桥,对其波形钢腹板和抗剪连接键的设计与构造进行了介绍,并对波形钢腹板和抗剪连接键的受力性能进行了计算分析,计算结果表明,在正常使用极限状态下,钢板的剪应力满足规范要求,且不会在钢板剪切屈服之前发生局部屈曲、整体屈曲或合成屈曲的破坏形式;剪力连接键的抗剪承载能力满足使用要求且具有较大的安全裕度。     

波形钢腹板PC箱梁抗剪连接键设计

波形钢腹板PC箱梁是一种新型的钢-混凝土组合结构,这种结构以波形钢板代替混凝土作为箱梁的腹板,并采用箱内体外预应力技术,实现了主梁的轻型化,进而减少了下部结构的工程量,由于其良好的受力特性在日本和欧美得到了广泛的应用。而抗剪连接键是能否为结构提供足够完整组合作用的一个决定因素,文章主要介绍波纹钢腹板PC组合箱梁抗剪连接键的设计计算方法,并介绍某波纹钢腹板PC组合箱梁连续梁桥（70m＋120m＋70m）的抗剪连接键的计算实例。     

冷弯薄壁型钢组合楼盖抗剪性能试验研究

为了研究冷弯薄壁型钢组合楼盖抗剪性能,进行了1个冷弯薄壁C型钢—压型钢板混凝土组合楼盖、3个冷弯薄壁C型钢桁架—压型钢板混凝土组合楼盖和1个冷弯薄壁C型钢桁架—ALC板组合楼盖试件的抗剪性能试验。详细考察了组合楼盖在低周反复荷载作用下的应变分布规律和破坏形式,分析了组合楼盖的滞回曲线、骨架曲线、荷载强度退化、刚度退化。试验研究表明:采用冷弯薄壁C型钢梁组合楼盖的抗剪极限承载力要高于采用冷弯薄壁C型钢桁架梁组合楼盖;抗剪件在一定程度上可以提高组合楼盖的抗剪承载力。     

钢-竹组合工字梁受剪性能试验研究

以钢-竹组合工字梁的竹材截面翼缘厚度、腹板宽度及剪跨比λ为参数,对9根钢-竹组合工字梁进行了受剪性能试验,分析了组合梁的破坏过程、破坏机理、变形及承载力等,研究了影响组合梁受剪性能的因素,校验了组合梁变形及受弯承载力计算公式,并提出了组合梁受剪承载力简化计算公式.研究结果表明:钢-竹组合工字梁整体工作性能优良,组合效应...     

波形钢腹板PC组合箱梁研究现状

文章介绍了波形钢腹板PC组合箱梁的结构特点,国内外对波形钢腹板PC组合箱梁性能的研究,包括:抗弯性能,抗剪性能,剪滞效应,预应力导入效率,徐变的影响,疲劳,扭转。最后建议波形钢腹板PC组合箱梁需进一步研究的内容。     

Shear behavior of partially encased composite I-girder with corrugated steel web: Experimental study

A new type of partially encased composite I-girder with corrugated steel web has been proposed to improve the structural performance of continuous girders under hogging moment. The shear behavior of such partially encased composite I-girders under anti-symmetric loading has been experimentally and analytically investigated. Experimental results show that the partially encased composite girders has superior shear strength compared to steel I-girders, since shear bucking of steel web is restricted by concrete encasement. The shear stiffness of the composite section is based on the total summation of corrugated web and concrete encasement with average thickness before cracking, and the ratio of shear resistance shared by the steel web and the concrete encasement depends on their shear stiffness. In addition, predicted shear strength of the partially encased composite girder with corrugated web is proposed according to the experimental failure mode and strain distribution. The analytical shear stiffness and shear resistance ratio at the elastic stage are verified by experimental results. And the calculated shear strength for steel and composite girders agree well with the experimental results. The comparison shows that the proposed analytical methods can be applied in predicting elastic shear stiffness and design shear strength for such partially encased composite girders with corrugated web.     

Shear behavior of partially encased composite I-girder with corrugated steel web: Numerical study

Shear behavior of partially encased composite I-girders with corrugated web has been investigated analytically and numerically in this paper. A 3-D finite element model with geometric and material nonlinearity is established and verified by the experiments. Subsequently, a parametric study is carried out to examine the effects of geometric and material properties on the shear behavior which includes corrugation, height, thickness, connection degree between steel web and concrete encasement. It is found that the ultimate shear strength of steel I-girders is improved with increases in the thickness, height and yield strength of corrugated web, while the ultimate shear strength of partially encased composite I-girders increases with the thickness, yield strength of corrugated web and the thickness, compressive strength of concrete encasement. However, the stud stiffness has little influence on the ultimate shear strength. Moreover, the concrete encasement improves the shear strength of steel I-girders, the degree of improvement increases with the thickness and compressive strength of the concrete, but decreases drastically with the thickness of corrugated web. Therefore, it is suggested that concrete should be poured on the corrugated web with thin thickness or low yield strength to prevent buckling occurrence before yielding of steel web. Finally, shear strength prediction equations are proposed and verified by numerical results. The calculated shear strength agree well with the numerical results for steel I-girders before and after composite with concrete, which indicates that the proposed analytical equations can be applied to predict the shear strength of such partially encased composite girders with corrugated web.     

Bending behavior of concrete-encased composite I-girder with corrugated steel web

A partially encased composite I-girder with flat or corrugated web has been proposed to improve the structural performance of continuous composite girder under hogging moment. The flexural behavior of such structure under two points symmetric loading has been experimentally and analytically investigated. Static flexural loading tests showed that the partially encased girder improved bending strength in comparison to steel I-girder, as local bucking of steel flange was restricted by encased concrete. Especially for the corrugated web girder, the ultimate bending strength was improved about 20%, and the ductility also increased about 3 times. In addition, the limitation of width-to-thickness ratios for steel and concrete-encased composite I-girders with corrugated web were suggested to prevent premature failure due to local buckling of compressive flange. Moreover, the analytical methods of flexural strength under service and ultimate state for partially encased composite girder were proposed and verified with experimental results. It was found that the analytical bending strengths agreed well with the experimental ones at both service and ultimate state, which means the proposed analytical equations can be applied in predicting flexural strength accurately for such encased composite girder with flat or corrugated web.     

考虑腹板剪切变形及滑移的波形钢腹板梁理论模型

在采用栓钉等柔性剪力连接件的波形钢腹板组合梁中,由于波形钢腹板较大的剪切变形及双界面剪切滑移,平截面假定不再适用。为此,通过将波形钢腹板梁的弯曲分解为顶底板整体满足平截面假定的主弯曲和顶底板各自满足平截面假定的次弯曲,引入波形钢腹板的剪切变形协调条件和界面剪切滑移关系,推导了考虑波形钢腹板剪切变形及界面滑移的波形钢腹板梁弹性弯曲微分方程,利用给出的横隔板对次弯曲和滑移的约束边界条件,求得了简支波形钢腹板梁在不同荷载作用下的解析解,并采用有限元分析予以验证。在此基础上,分析了横隔板及滑移对梁体弯曲性能的影响。结果表明：横隔板约束对梁体变形影响很小,但会使其附近梁段顶底板出现应力集中;当界面剪切刚度系数大于0.9时,在高跨比1/20~1/10范围内,考虑滑移与不考虑滑移梁跨中挠度比小于1.05;界面剪切刚度系数越小,横隔板附近梁段顶底板应力集中越严重。     

部分外包混凝土简支组合梁受弯性能试验研究

为了研究部分外包混凝土组合梁在正弯矩作用下的受力性能,考察钢梁腹部钢筋混凝土对组合梁承载力及刚度的影响,对4根简支梁试件进行了试验研究,其中包括1根普通钢-混凝土组合梁试件和3根钢梁腹板与腹部混凝土界面采用不同连接方式的部分外包组合梁试件。试验结果表明：钢梁腹板与腹部混凝土界面采用不同连接方式对部分外包组合梁的受弯承载力和刚度没有显著的影响;与普通钢－混凝土组合梁相比,由于钢梁腹部钢筋混凝土的贡献,部分外包组合梁的受弯承载力和抵抗变形的能力均有较大的提高;承载力极限状态时部分外包组合梁中钢梁与腹部混凝土之间的相对滑移值较小,其滑移效应对组合梁截面受弯承载力的影响可以忽略不计。在试验研究的基础上,推导了部分外包组合梁塑性受弯承载力的计算公式,计算结果表明,简化塑性理论可以较准确地预测该类组合梁的受弯承载力。     

Investigation on the Collapse Behavior of Diagonal Stiffened Composite Plate Girders Subjected to Shear Loading

In this study, a new analytical method is presented to estimate the shear capacity of diagonally stiffened steel–concrete composite plate girders. This method is formulated based on tension field action in steel girder web and failure mechanism of concrete slab deck. To validate the accuracy of the proposed method, the obtained results are compared with three-dimensional finite element analysis of composite plate girders with different configuration of stiffeners. The results of analytical and numerical investigations indicate that the proposed method can accurately estimate the ultimate shear capacity of composite plate girders. In addition, it is shown that the diagonal stiffeners on one hand can reduce the buckling effects of shear panel of girders and on the other hand can increase the strength of elastic shear buckling and ultimate shear capacity of girders well in comparison with the unstiffened thin steel plate girders.     

Shear buckling strength and design of curved corrugated steel webs for bridges

This paper presents the shear buckling strength and design of curved corrugated steel webs for bridges considering material inelasticity. The inelastic buckling strength is determined from buckling curves based on the proposed shear buckling parameter, which is a function of the elastic shear buckling strength of steel web and the material shear yielding strength. A finite element analysis is carried out to study the geometric parameters affecting the shear buckling strength of curved corrugated steel webs for bridges. Based on the numerical results, a shear buckling parameter formula is proposed with no need to calculate either local, global, or interactive buckling parameters. But it depends on the geometric properties of the curved corrugated web profile. Another formula is presented to maximize the shear buckling capacity of curved corrugated web. The proposed formulae agreed well with the published experimental data. The curved corrugated webs produce a tremendous increase in the shear buckling strength and considerable weight saving in regard to the corresponding trapezoidal corrugated webs. The corrugation angle has a considerable effect on the behavior of curved corrugated webs, where higher corrugation angles produce a tremendous increase in the shear buckling strength of curved corrugated webs. It was found that the proposed approach provides a good prediction for the shear buckling strength of curved corrugated steel webs of bridges.     

Zur plastischen Bemessung hochfester kammerbetonierter Verbundträger

Plastic design method for high‐strength partially concrete encased composite beams. Partially concrete encased composite beams offer numerous advantages compared to conventional composite beams consisting of a steel beam and a concrete slab. In many cases these advantages are not used because of missing practicable design models. In the current paper the load bearing behaviour and the rotation capacity of partially concrete encased composite beams made of high strength steel and concrete is investigated using experimental tests and parametric studies. At first the influence of high strength concrete encasement and high strength structural steel on the cross section capacity is described. Taking into account the stress‐strain distribution of high strength concrete and steel a new plastic design method for partially concrete encased composite beams was affiliated. The experimental and theoretical results are documented in the research report [1] and the dissertation [2].