设置横隔板方钢管混凝土柱轴压性能试验

为研究横隔板对方钢管混凝土柱轴压力学性能的影响,以横隔板数量、间距、含钢率为主要参数设计了5个试件(其中1个未设横隔板,4个设置了横隔板),进行了轴压性能试验和承载力计算公式推导。研究结果表明,对于高宽比为4的试件,横隔板间距与柱截面边长之比大于等于2时,横隔板的约束效应对钢管屈曲模态、承载力及延性的影响不显著,横隔板间距与柱截面边长之比等于1时,则其约束效应对钢管屈曲模态、承载力及延性的影响较明显。与试验结果相比,所推导的承载力公式计算结果略大于试验结果,试验为高效利用钢材提供参考借鉴。

Flexural behaviors of double-reinforced ECC beams

In order to investigate the flexural behaviors of engineered cementitious composites （ECC）, theoretical and experimental researches are done on flexural doublereinforced ECC beams. Based on the assumption of the plane section remaining plane in bending and simplified constitutive models of materials, the calculation methods of load carrying capacities for different critical stages are obtained. Then, these calculation methods are demonstrated by comparing the test results with the calculation results. Finally, based on the proposed theoretical formulae, the effects of the compression strength, compression strain and tension strength of ECC, and the reinforcement ratio on the flexural behaviors of double-reinforced ECC beams are analyzed. The calculated and measured results are in good agreement, which indicates that the theoretical model can be used to predict the momentcurvature response of steel reinforced ECC beams. And the results of parametric studies show that the increase in the compression strength of ECC can greatly improve the flexural performance of beams; the increase in the ultimate compression strain can significantly improve the ultimate curvature and ductility, but has little effect on the load bearing capacity of beams. little effect on the flexural The tensile strength of ECC has behaviors of ECC beams. The increase in the steel reinforcement ratio can lead to significant improvement of the load bearing capacity and the stiffness of beams, but a degradation of the ductility of beams. The theoretical model and parameter analysis results in this paper are instructive for the design of steel reinforced ECC beams.

广州有轨电车琶醍站加固改造设计分析

琶醍站(原啤酒博物馆站)位于珠江啤酒厂的琶醍啤酒创意产业艺术区内,原为珠江啤酒厂的水泵房,由于有轨电车线路穿过水泵房,需将水泵房搬迁后,方可进行改造。基于此,本文分析了该工程改造过程中的重难点,阐述了改造的设计思路,应用化拉为剪、高承载力低延型性、混凝土抱箍节点等关键技术,以期为后续相关加固改造项目提供借鉴。

多层钢结构厂房结构及节点性能化设计

根据钢标性能化设计,采用“低延性-高承载力”的抗震设计思路,对某常规设计的多层钢结构厂房进行性能化设计,对实际性能化设计过程中产生的问题进行分析阐述,证明采用合理承载力性能等级和延性等级结构设计是成立的,在节点设计时性能化设计是更为合理的计算方式,并通过对比钢结构工业厂房常规设计和性能化设计,对用钢量方面做比较,得出结构总用钢量可以减少10%的结论,在烈度不高的工业建筑中采用性能化设计对节约钢材用量产生了积极效果,为钢结构优化设计提供了新的方向。对组合钢次梁截面优化,探索组合梁更加合理的受力计算模式,得出上小下大截面组合梁相近应力比的情况下能节省40%的钢材用量的结论。

圆钢管约束钢筋混凝土短柱的轴压力学性能

进行了20个圆钢管约束钢筋混凝土短柱的轴压力学性能试验研究,试验中的主要参数为钢管径厚比(50、70和100),混凝土强度(C50和C80)和钢管屈服强度(Q235和Q345)。试验结果表明:圆钢管约束钢筋混凝土柱中被分隔钢管的高度对构件的轴压承载力和延性无明显影响;随钢管径厚比增大和混凝土强度的提高,构件的延性降低;随钢管屈服强度的提高,构件的轴压承载力提高,但钢管屈服强度对构件的延性无明显影响。对钢管的应力分析结果表明,圆钢管约束钢筋混凝土轴压短柱的峰值荷载点对应于钢管的屈服点。根据试验结果和钢管的应力分析结果建立了圆钢管约束钢筋混凝土短柱的轴压承载力公式,提出了设计建议。