体外预应力钢与混凝土组合梁试验研究

进行了 5根简支体外预应力钢与混凝土组合梁在竖向荷载下的试验研究。对比分析了普通钢与混凝土组合梁、预应力钢与混凝土组合梁和预应力加固钢与混凝土组合梁的受力性能与破坏形态。     

钢-混凝土组合梁滑移性能的研究与展望

钢-混凝土组合梁的研究和应用近年来发展很快,其兼有钢结构与混凝土结构两者的优点。钢梁与混凝土板界面滑移对组合梁的承载力和抗弯性能有很大影响。它在一定程度上减小组合梁刚度,增大变形,影响构件性能。通过总结目前国内外对钢-混凝土组合梁滑移性能研究以及连接件的荷载-滑移曲线公式,对钢-混凝土组合梁的研究提出了问题并进行了展望。     

新型外包钢-混凝土组合梁与普通钢-混凝土组合梁性能对比分析

新型外包钢-混凝土组合梁与普通钢-混凝土组合梁相比具有受力性能好,防火性能高,综合经济指标提升等优势。运用ANSYS有限元分析软件从完全剪力连接和部分剪力连接两个方面对新型外包钢-混凝土组合梁和普通钢-混凝土组合梁进行受力性能对比和分析,得出新型外包钢-混凝土组合梁性能优于普通钢-混凝土组合梁的结论。     

箱形钢-混凝土组合梁简介

介绍了箱形钢-混凝土组合梁的提出及箱形钢-混凝土组合梁的结构形式，探讨了箱形钢-混凝土组合梁的理论研究及应用现状，提出了箱形钢-混凝土组合梁研究中需要解决的问题，以促进箱形钢-混凝土组合梁的应用。     

钢—混凝土蜂窝组合梁的剪应力分析

介绍了钢—混凝土蜂窝组合梁的优点,通过对钢—混凝土蜂窝组合梁施加均布荷载和集中荷载,分析了该组合梁的力学性能,以明确钢—混凝土组合梁的工作状况,为其推广应用提供技术支撑。     

钢-混凝土预制板组合梁的试验研究

为研究钢-混凝土预制板组合梁在静载作用下的组合效应,完成了3根钢-混凝土预制板组合梁在跨中集中荷载作用下的试验,结合试验结果与现有的组合梁理论,对钢-混凝土预制板组合梁的抗弯受力性能及其组合效应进行了分析,为该方向的进一步研究提供实用参考价值。     

钢—混凝土组合梁的发展及研究

对钢—混凝土组合梁结构进行了介绍,较为系统地阐述了钢—混凝土组合梁的发展史、特点、研究方法及其应用状况,并介绍了有关钢—混凝土组合梁方面值得进一步研究的问题,以推动钢—混凝土组合梁的应用。     

腹板嵌入式组合梁抗弯性能理论和试验研究

提出了一种新型腹板嵌入式钢-混凝土组合梁,并对该组合梁的整体抗弯性能和抗剪性能进行了研究.首先阐述了腹板嵌入式钢-混凝土组合梁的构成、受力特点和主要优点,然后介绍了该组合梁的抗弯承载力、钢梁与混凝土翼板之间的滑移以及挠度计算公式.通过竖向荷载作用下的静力加载试验对4个腹板嵌入式钢-混凝土组合梁试件的抗弯承载力、滑移影响...     

钢-压型钢板混凝土组合梁裂缝的试验研究

为研究钢 混凝土组合梁在负弯矩作用下混凝土翼缘裂缝的发生和发展情况 ,对 8根钢 压型钢板混凝土组合梁进行了试验研究。结果表明 ,影响组合梁裂缝的因素比较复杂 ,需要采取有效的措施加以控制。同时 ,结合试验和理论分析 ,进一步完善了钢 混凝土组合梁混凝土翼缘最小配筋率、开裂弯矩和最大裂缝宽度的计算方法 ,计算结果与实测值吻合良好     

浅析筒仓仓顶结构设计

利用结构力学的基本原理,对大直径筒仓仓顶的钢与混凝土组合梁结构进行了力学分析,讨论了影响钢与混凝土组合梁结构结构设计的主要因素.     

钢-混叠合板组合梁在连体结构工程中的应用

近年来钢 混凝土组合梁以其施工速度快、材料性能应用充分等特点在我国工程建设中得到了广泛的应用。跨度为 3 5m的T形钢 混凝土叠合板组合梁在清华科技园连体工程中得到了应用。与钢骨混凝土梁方案进行了比较 ,钢 混凝土叠合板组合梁比钢骨混凝土梁方案更加优越 ,非常适用于大跨横向承重结构。     

Experimental study on curved composite beams subjected to combined flexure and torsion

There are situations in which a composite steel–concrete beam is subjected to torsion, such as members that are curved in plan or straight edge beams. The concrete slab and steel beam contribute to the torsional strength and stiffness of a composite steel–concrete beam, but this composite action is usually ignored in design codes of practice, which leads to conservative designs. Therefore, this paper investigates the ultimate strength of curved in place composite steel–concrete beams. Eight curved in plan composite steel–concrete beams have been tested under a single applied load at mid-span. Partial shear connection has also been considered in these tests. The composite steel–concrete beams have been designed with different span/radius of curvature ratios. This paper further supports the view that, in the presence of flexure, there will be an increase in the torsional moment capacity, but the flexural moment capacity does not greatly increase in the presence of torsion. A model has also been presented to represent the bending–torsion interaction for curved in plan composite steel–concrete beams with full and partial shear connection.     

轻钢-混凝土组合梁的试验研究及非线性有限元分析

针对轻钢-混凝土组合梁这种新的结构形式,本文进行了六个试件的试验研究,分析了构件的破坏形式、荷载-位移曲线、荷载-应变曲线、钢材和混凝土的应变分布及板宽度方向应变分布等。通过试验研究,初步了解了轻钢-混凝土组合梁的特点和各种截面的粘结性能。采用组合梁单元模型,对轻钢-混凝土组合梁进行了非线性有限元分析,理论计算结果与试验结果吻合较好。     

体外索钢箱——混凝土组合连续梁非线性结构性能试验研究

钢箱-混凝土组合连续梁负弯矩区混凝土的开裂问题影响了这类组合结构向更大跨度的发展。针对这一问题,提出在钢箱-混凝土组合连续梁中施加体外索的新技术,研究施加体外索对增强钢箱一混凝土组合连续梁负弯矩区混凝土的抗裂能力,提高钢箱-混凝土组合连续梁弹塑性结构性能的有利作用。经对比试验表明,施加体外索后,钢箱-混凝土组合连续梁负弯矩区混凝土的开裂荷载提高2．8倍,组合连续梁的弹塑性抗弯刚度提高29．35％,承载力提高34．67％,结构性能显著提高。在试验研究基础上,分析钢箱-混凝土组合连续梁负弯矩区局部力学性能与整体非线性结构性能的关系,揭示体外索提高钢箱-混凝土组合连续梁弹塑性结构性能的力学实质,给出承载力计算建议。研究结果可作为体外索钢箱-混凝土组合连续梁工程应用和理论分析的参考。     

Strength and post‐yield behavior of T‐section steel encased by structural concrete

In this study, the seismic performance of unsymmetrical steel–concrete composite precast beams with T‐shaped steel section were numerically explored and validated by their earlier experimental investigation. This design is based on the proposed calibrated finite element model in which key damage parameters for the evaluation of the nonlinear, post‐yield behavior of the precast composite steel beams were identified. The proposed nonlinear finite‐element‐based numerical model uses various parameters, including the dilatation angle and concrete‐damaged plasticity, to simulate the nonlinear behavior of unsymmetrical composite precast beams with T‐section steel. Greater seismic capacity with greater ductility, contributing to a maximized structural capacity within the composite precast beams was introduced by the effective use of the 2 materials, steel and concrete, and shown by the nonlinear hysteretic investigation of unsymmetrical steel–concrete composite precast beams that was validated experimentally. The post‐yield structural capacity found via the numerical analysis agrees with experimental results when the concrete‐damaged plasticity of the plastic‐damaged seismic model for concrete and the von Mises criteria of the steel section were introduced into the finite element model. Practical design parameters and recommendations were eventually suggested by examining the influence of precast composite beams with unsymmetrical steel sections on the concrete degradations and damage evolution.     

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].     

Composite beam composed of steel and precast concrete (Modularized Hybrid System,MHS). Part I: experimental investigation

An experimental investigation of composite beams composed of wide flange steel and precast concrete is presented. The bottom flange of the steel section is encased in precast concrete. Utilizing the merits of both steel and concrete material, the size of the steel beams can be reduced without sacrificing performance. The bottom flange of the steel beam is reinforced with concrete at a manufacturing plant, eliminating the use of temporary pour forms. The composite beams were tested to investigate how the size of the wide flange steel and how the top and bottom reinforcements influence the behaviour of the beams. Flexural load carrying capacity, load displacement relationships and failure modes were examined. The test specimens were T‐shaped composite beams with slabs, each measuring 10‐m long. The flexural moment strength of all of the composite beams—at both the yield limit state and the maximum load limit state—was measured and compared with the analytical flexural capacity. The stiffness degradation, ductility and dissipating energy capabilities of the composite beams were investigated based on the hysteresis curves. The composite beams tested in this study successfully reduced both the floor height of the building and the size of the steel beams needed to meet code requirements. Copyright © 2008 John Wiley & Sons, Ltd.     

深圳华融大厦型钢混凝土组合结构设计

深圳华融大厦的框架筒体结构采用型钢混凝土混合结构框架,可以解决跨度大、梁高受限的问题。从结构选型、整体计算分析等方面介绍了深圳华融大厦的结构设计,阐述了框架柱错位处理方法及转换桁架等特殊构件的设计要点,在型钢混凝土结构设计时应充分考虑型钢制作和安装的特点。     

预应力组合梁框架抗震性能研究

本文对预应力组合梁框架的抗震性能进行试验研究与滞回分析。基于预应力组合梁框架的低周反复荷载试验,对其破坏形态、破坏机制、位移延性、耗能能力、刚度退化、变形恢复能力等抗震性能进行了较为系统的研究。研究表明预应力组合梁框架具有优良的抗震性能。编制了预应力组合梁框架滞回分析程序,探索了预应力组合梁框架理论分析的新途径。     

钢-混凝土连续组合梁的设计方法

针对我国现行钢结构规范的不足 ,并结合国内外组合结构规程的先进成果 ,从整体分析及负弯矩区计算两个方面对钢 混凝土连续组合梁的设计方法进行了探讨。同时对连续组合梁的研究现状也做了简要介绍。介绍的方法和结论可供设计人员参考