波折腹板梁抗剪性能研究

本文基于非线性有限元结构分析方法 ,对波折腹板梁在剪力作用下的破坏机理及基本性质进行了理论分析 ,分析中考虑了大变形与几何初始缺陷。分析结果表明波折腹板梁的抗剪极限承载力明显优于普通工字钢梁。     

腹板开矩形孔复杂卷边冷弯槽钢梁局部屈曲性能及直接强度法研究

为了研究腹板开孔复杂卷边冷弯槽钢梁的局部屈曲性能，以及探究北美冷弯型钢结构设计规范(AISI S100-2016)中腹板开孔冷弯槽钢梁局部屈曲直接强度法计算公式的可靠性，对孔高比(孔洞高度与腹板高度的比值)分别为0、0.2、0.4、0.6和0.8的10个腹板开矩形孔复杂卷边冷弯槽钢梁纯弯试件进行了静力试验研究。试验结果表明，开孔和不开孔试件均发生以局部屈曲为主的屈曲破坏模式，与不开孔试件相比，开孔试件的受弯承载力下降，且下降幅度随孔高比的增大而增大。利用ANSYS有限元程序对试验进行了模拟分析，分析结果与试验结果吻合良好；在此基础上，采用经试验验证的有限元模型，通过变换腹板高度、板厚和孔高比开展了有限元参数分析，并根据有限元参数分析结果对已有腹板开孔冷弯槽钢梁的弹性局部屈曲临界应力近似计算公式进行了修正。基于试验结果、有限元参数分析结果以及修正的弹性局部屈曲临界应力近似计算公式，对AISI S100-2016中开孔冷弯槽钢梁发生以局部屈曲为主破坏时的直接强度法计算公式进行了修正。     

An Accurate Analysis for Sandwich Steel Beams with Graded Corrugated Core Under Dynamic Impulse

This paper addresses the dynamic loading characteristics of the shock tube onto sandwich steel beams as an efficient and accurate alternative to time consuming and complicated fluid structure interaction using finite element modeling. The corrugated sandwich steel beam consists of top and bottom flat substrates of steel 1018 and corrugated cores of steel 1008. The corrugated core layers are arranged with non-uniform thicknesses thus making sandwich beam graded. This sandwich beam is analogous to a steel beam with web and flanges. Substrates correspond to flanges and cores to web. The stress–strain relations of steel 1018 at high strain rates are measured using the split-Hopkinson pressure. Both carbon steels are assumed to follow bilinear strain hardening and strain rate-dependence. The present finite element modeling procedure with an improved dynamic impulse loading assumption is validated with a set of shock tube experiments, and it provides excellent correlation based on Russell error estimation with the test results. Four corrugated graded steel core arrangements are taken into account for core design parameters in order to maximize mitigation of blast load effects onto the structure. In addition, numerical study of four corrugated steel core placed in a reverse order is done using the validated finite element model. The dynamic behavior of the reversed steel core arrangement is compared with the normal core arrangement for deflections, contact force between support and specimen and plastic energy absorption.     

Fatigue strength evaluation of welded structural details in corrugated steel web girders

Fatigue strength evaluation of welded structural details is of practical significance in the design of corrugated steel web girders in highway bridges and industrial structures. In this paper, the fatigue strengths of corrugated steel web girders with several welded structural details and welding methods are analytically examined by fatigue tests of corrugated web beams and small-size welded joints. The stress concentration & distribution characteristics of corrugated web beams were analysed using finite element analysis. The beam test results showed that the structure with scallops or notches in the flange has lower fatigue strength and that with butt joints is prone to suffer from shear crack on the corrugated web. Within the inside range of the scallop, the stress concentration becomes greater with the increase of scallop radius and the tension flange contributes significantly to the bending capacity of corrugated steel web beams. The tests for small-size welded joints indicated their applicability in the analysis and prediction of S-N relationship of the test corrugated steel web beams. Finally, the fatigue crack propagation lives of weld joints were compared with those of test corrugated steel web beams with respect to related design Categories of the AASHTO LRFD Bridge Design Specifications.     

波形钢腹板体外预应力组合梁正截面承载力及应力分布特征研究

为研究预应力状态下波形钢腹板组合梁的截面应力分布特征,设计制作2根波形钢腹板组合梁,在预应力筋张拉过程中研究了预应力对组合梁受弯截面应力分布特征的影响,通过正截面受弯试验对试件塑性承载力先进行测定;对体外预应力组合梁正截面承载力进行了理论分析;利用有限元分析软件,对与试件同类型的波形钢腹板体外预应力组合梁的塑性受弯承载力进行了参数分析,研究了腹板高度和混凝土强度对正截面承载力的影响。结果表明：预应力对此类构件的翼缘应变变化量影响较波形钢腹板的大约2~3倍;预应力损失对截面中性轴位置变化影响可忽略不计;施加预应力将使波形钢腹板组合梁的受弯承载力提高约30%,腹板高度等参数与此类结构跨中截面承载力呈线性关系;理论值与有限元模拟结果吻合良好,验证了所提出正截面承载力理论的准确性。     

波形钢板-混凝土组合剪力墙抗震性能试验研究

为研究波形钢板-混凝土组合剪力墙的抗震性能,完成了竖向波形钢板-混凝土组合剪力墙、水平波形钢板-混凝土组合剪力墙以及平钢板-混凝土组合剪力墙拟静力试验,研究了波形钢板-混凝土组合剪力墙在低周往复荷载作用下的变形能力和破坏模式,分析了荷载-位移滞回曲线、骨架曲线、各阶段特征荷载和位移值等,以及结构的破坏特征、变形和耗能能力、刚度和承载力退化。试验结果表明：波形钢板-混凝土组合剪力墙具有较大的抗侧刚度、较好的延性和耗能能力;与平钢板-混凝土组合剪力墙相比,波形钢板-混凝土组合剪力墙有较好的界面黏结性能,而平钢板-混凝土剪力墙由钢板变形引起的混凝土剥落严重;波形钢板-混凝土组合剪力墙的初始刚度较平钢板-混凝土组合剪力墙的高,竖向波形钢板-混凝土组合剪力墙的承载力和极限位移较水平波形钢板-混凝土组合剪力墙的高,波形钢板-混凝土组合剪力墙的承载力退化和刚度退化比平钢板-混凝土组合剪力墙的慢,表现出较好的受力性能。采用ABAQUS有限元软件可以较好地模拟试验,有限元分析结果表明,波形钢板的应力分布比较均匀,组合作用效应明显,适合在抗震结构中采用。     

The effect of stiffener on behavior of reduced beam section connections in steel moment-resisting frames

Reduced Beam Section (RBS) connections are a new type of connection which have been used in steel moment-resisting frames since the 1994 Northridge earthquake. This study is primarily aimed at analyzing the effects of suitable web stiffeners on preventing the deterioration effect of the hysteresis curve for RBS connections. Results of more than 183 nonlinear finite element analyses on different IPE sections with radius cut, straight cut, and drilled-flange RBS connection showed that different web stiffeners considerably contribute to the enhancement of seismic performance of RBS connections. In this research, the effects of factors such as the geometry and the number of the stiffeners, the distance between the stiffener and column side, and the length and thickness of the stiffener on the seismic performance of RBS connections were also studied.     

腹板开孔钢梁的极限承载力有限元分析

应用有限元法对腹板中心开圆孔钢梁的性能和极限承载力进行了研究,并用其它学者所做的试验加以验证。由有限元计算所得的极限荷载、破坏特征以及荷载变形关系与试验结果比较接近。研究表明,在孔洞周边设置加劲肋对孔进行加强可以显著改善这类梁的承载性能。     

波纹腹板H型钢梁的抗弯强度分析

钢梁腹板的薄壁化一直是困扰钢结构发展的难题,波纹腹板钢梁在一定程度上解决了这个矛盾。本文以钢梁的抗弯强度为基础,对比计算了波纹腹板钢梁与普通钢梁的强度差异,并在此基础上分析了影响波纹腹板钢梁抗弯强度性能的因素,为这种新型钢梁的应用提供了理论依据。     

钢连梁-钢板混凝土组合剪力墙组合件抗震性能试验研究

为进一步提高联肢剪力墙结构的抗震性能,提出了一种改进型钢连梁-钢板混凝土组合剪力墙混合结构.通过对5个1/2缩尺连梁-墙肢组合件的低周往复加载试验,研究了钢连梁跨高比和加劲肋布置等因素对组合件抗震性能的影响.研究表明:组合件塑性变形均集中在易更换的钢连梁上,墙肢和节点部位损伤程度较低,有利于实现结构罕遇地震作用后的功能...     

波形钢腹板组合箱梁桥剪力滞效应研究

波形钢腹板组合箱梁由于其力学性能和经济性能比普通箱梁优越而正被广泛地使用,本文介绍了计算波形钢腹板组合箱梁桥剪力滞系数的能量变分法,用有限元分析软件ANSYS进行了波形钢腹板组合箱梁桥的建模,并采用能量变分法的结果加以验证。结果表明采用有限元法模拟波形钢腹板组合箱梁桥的剪力滞效应效果较好,分析了波形钢腹板组合箱梁桥横桥向和纵桥向剪力滞系数的变化规律。     

On the hysteretic behavior of trapezoidally corrugated steel shear walls

At present, corrugated plates have numerous applications such as web of plate girders and aerospace applications. Higher out‐of‐plane stiffness and initial elastic strength of the corrugated plates compared with flat plates are reasons for consideration. This study investigates the behavior of trapezoidally corrugated steel plate shear walls (TCSPSWs) under monotonic and cyclic loadings. Finite element analyses that include both material and geometric nonlinearities are employed for the examination. The results from finite element analysis are verified through tested specimen findings. Moreover, the behavior of the steel shear walls with the flat infill panels and the corrugated plate infill panels is compared. The results show that explicit dynamic analysis is the most suitable analysis for the TCSPSWs under quasi‐static loading. Furthermore, although strength of the TCSPSWs obtained from the finite element analysis and the test are fully coincident in elastic region, nonetheless, they are fairly coincident in elastic–plastic and plastic region. Copyright © 2012 John Wiley & Sons, Ltd.     

波纹腹板焊接H形钢疲劳性能试验研究

设计了4根梯形波纹腹板焊接H形钢试件,依据GB 50017-2003《钢结构设计规范》的相关规定进行疲劳性能试验,并特别考虑了GB 50278-2010 《起重设备安装工程施工及验收规范》中吊车梁安装偏差的相关规定。通过ANSYS有限元分析验证试件破坏形式的合理性。研究结果表明：对于CECS 291:2011 《波纹腹板钢结构技术规程》中推荐波形的梯形波纹腹板H形钢,其疲劳性能优于平腹板H形钢,疲劳设计中可按3类钢构件进行计算,且不考虑腹板波纹转折引起的应力集中及安装偏差等施工因素的影响。     

波浪腹板轴心受压构件设计方法及试验研究

波浪腹板工形构件作为受弯构件具有较高的承载效率。波浪腹板工形构件作为轴心受压构件使用,在截面合理设计条件下也仍不失为一种性能良好的构件。通过理论和数值分析,对波浪腹板轴心受压构件的稳定性设计理论进行研究,提出其稳定承载力的计算方法;制作了两个试件进行轴压试验研究,并与有限元分析结果进行对比。同时比较平腹板与波浪腹板受压构件的经济性,说明在构件绕强轴失稳破坏的情况下,减小波浪腹板的厚度而增大其高度可获得较大的承载力。     

方钢管混凝土框架-十字加劲薄钢板剪力墙结构水平承载力研究

为研究方钢管混凝土框架-十字加劲薄钢板剪力墙结构的抗震性能和水平承载力,进行了一榀缩尺比为1∶3的2层单跨方钢管混凝土框架-十字加劲薄钢板剪力墙结构的拟静力试验,得到了其破坏形态、荷载-位移滞回曲线、骨架曲线、特征荷载和位移等。利用有限元软件ABAQUS对其进行了非线性数值模拟,分析了方钢管混凝土框架-十字加劲薄钢板剪力墙的抗震性能、受力机理和破坏机制。基于试验和数值模拟结果,结合理论研究,提出了方钢管混凝土框架-十字加劲薄钢板剪力墙的水平承载力的计算式,并将其计算结果与试验、数值模拟结果进行对比。结果表明：方钢管混凝土框架-十字加劲薄钢板剪力墙具有较高的水平承载力、初始刚度及良好的延性和耗能能力,水平承载力计算式的计算结果与试验、数值模拟结果吻合较好。     

波折腹板H形截面梁的有限元分析

波折钢腹板相对于平直钢腹板具有优异的抗屈曲性能和良好的局部稳定性.利用ANSYS有限元软件分别建立了波折腹板H形截面梁和平直腹板H形截面梁的有限元模型,通过对比总结分析两种梁在轴压力、弯矩和剪力作用下的截面应力分布情况的差异,得出波折腹板H形截面梁在轴压力和弯矩作用下由翼缘承担大部分荷载,在剪力作用下由腹板承担大部分荷载.得到的结果可以为相关结构设计提供一定的参考.     

钢骨混凝土连梁联肢剪力墙抗震性能试验研究及有限元分析

国内已有部分超高层建筑结构采用钢骨混凝土连梁联肢剪力墙,但现行规范尚未对其钢骨含钢率等控制参数给予明确规定。为此,对不同含钢率的钢骨混凝土连梁联肢剪力墙进行了低周反复荷载试验研究、ABAQUS有限元模拟以及变参数分析。分析结果表明：钢骨混凝土连梁联肢剪力墙试件的破坏模式、水平承载力、变形能力和耗能能力明显优于钢筋混凝土连梁联肢剪力墙;由ABAQUS参数分析结果可知,钢骨含钢率应控制在4%~8%之间,且宜增加连梁钢骨腹板的面积。     

波形钢腹板组合槽型梁静载试验与有效预应力分析

波形钢腹板组合槽型梁是一种新型下承式开口薄壁桥梁结构,对4片按照1/4相似比进行设计的试验梁进行两点对称加载和有限元分析,研究两组试验梁在对称荷载作用下的荷载位移关系、截面应变分布、裂缝发展规律和破坏形态等,分析张拉预应力和释放预弯力后试验梁底板混凝土的有效预压应力。研究表明：竖向荷载作用下试验梁符合平截面变形规律,应忽略波形钢腹板对抗弯刚度的贡献和底板混凝土对抗弯承载力的抵抗作用;试验梁混凝土受压区受限于上翼缘板,其应变分布为梯形而非常规的三角形分布;下承式槽型截面的中性轴偏低,波形钢腹板预弯钢梁反弹能够有效地对混凝土施加预压应力;采用波形钢腹板能有效提高槽型梁的预应力施加效率,文中建议的波形钢腹板组合梁预应力等效荷载法,能准确计算此类结构的混凝土有效预压应力;两组试验梁由于配筋量的不同分别发生塑性和脆性弯曲破坏;波形钢腹板组合槽型梁的自重轻、抗弯刚度较大、具有较好的延性和抗裂性能。     

Experimental and numerical study on eccentric compression performance of partially encased composite columns with corrugated web

Partially encased composite (PEC) members are becoming increasingly popular because of their high strength and suitability for prefabrication and assembly. Corrugated steel plate has higher out-of-plane stiffness than flat steel plate. When it is combined with concrete, the bonding between corrugated steel plate and concrete is more obvious than that between flat steel plate and concrete. For this reason, a new type of corrugated web PEC column (CPEC column) was proposed in this paper, and its eccentric compression performance was studied by experiment and numerical method. Nine specimens were tested, of which two were subjected to axial compression and seven were subjected to eccentric compression. The key factors considered in the experiment were the loading direction, load eccentricity, link spacing, and width-to-thickness ratio of flange. A three-dimensional finite element model of the CPEC columns was established and verified, and the influence of the wave angle of corrugated web on the behavior of CPEC columns under eccentric compression was investigated using a parametric study. Finally, the current design codes for estimating the interaction curve and bearing capacity of CPEC columns were assessed.