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1.
针对热塑性长纤维增强复合材料模板体系在剪力墙混凝土浇筑过程中的实测,探讨其简化计算模型的选取。现场实测结果表明:在混凝土侧压力和施工荷载的作用下,面板主要处于受拉状态,平面上两个方向的应变比为0.65～1.79, 说明该塑料模板的简化验算,除整体按双向板进行验算外, 尚应针对面板、水平肋、垂直肋等分别进行验算。 相似文献
2.
厚度2.8 m的现浇混凝土楼板的重量远大于危险性较大模板支撑体系规定的荷载值,采用通常的模板支撑架不能满足立杆稳定性验算的要求。设计超厚板独立支撑模板支撑体系,在模板支撑架立杆上布置应变测点,采集浇筑混凝土过程中的应变数据。分析显示:局部测点应变值偏大与模架下方立杆偏心受压有关,浇筑混凝土过程中出现瞬间动载远超静态荷载应变允许值等现象。建议应用类似模板支撑结构时,设计更为合理的立杆上方承载装置;浇筑和振捣混凝土形成的动荷载是模板支撑架的安全隐患,有必要进一步研究动荷载与模板支撑架稳定性之间的关系。 相似文献
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滑模技术在水利水电工程中常用于大体积混凝土施工,在地下洞室混凝土衬砌很少涉及,特别是对于小断面地下洞室混凝土衬砌更是未曾采用。对于滑模这种先进的施工技术如何应用于小断面地下洞室混凝土衬砌,本文结合工程实际情况,对液压滑模系统的结构设计和施工方法进行了探讨和总结,为滑模技术在小断面地下洞室混凝土衬砌提供了实际经验。 相似文献
4.
李克杰 《马钢职工大学学报》2013,(1):38-42
以结构基本自振周期的变化率作为自变量,构造识别精度较高的对数函数,将其作为结构损伤的表征量,借助有限元分析设计软件ETABS对14层钢筋混凝土纯剪力墙结构进行数值模拟,揭示了地震波属性（峰值速度与加速度之比）、结构高宽比及等效损伤位置、损伤程度对整体结构抗震性能的影响规律,提出了适用于RC剪力墙结构剩余抗震能力的评价模型。 相似文献
5.
A pseudo-dynamic testing program was generated on a fabricated composite frame with steel plate shear walls (SPSWs) to study its seismic performance. The specimen was a three-storey single-bay frame, which was composed of H-section steel columns and composite beams, and was assembled by bolted height-adjustable steel beam-to-column connections (BHA connections). Beam-only-connected SPSWs were selected as lateral load resisting members. The specimen was subjected to four ground motions of progressively increasing intensity. The results showed that: (1) beam-only-connected SPSWs provided sufficient lateral load resistance, lateral stiffness, and energy dissipation capacity to the fabricated frame via the tension field action developed in their infill panels; (2) the fabricated frame, assembled by BHA connections, exhibited substantial redundancy and good ductility; (3) an undesirable failure mode of the fabricated frame, in huge earthquakes, included severe cracking in composite beams and block shear failure in SPSWs’ connections; (4) the inter-storey shear force distribution determined by ASCE/SEI 7-10 was verified with experimental data. 相似文献
6.
双层钢板混凝土组合剪力墙的抗剪性能(英文) 总被引：1，自引：0，他引：1
为深入了解双层钢板混凝土组合剪力墙的抗剪性能,采用数值模拟的方法研究了钢板厚度、混凝土厚度、混凝土强度及组合剪力墙的跨高比等主要参数对该组合剪力墙抗剪性能的影响规律,并提出了该组合剪力墙弹性抗侧刚度及抗剪极限承载力的简化计算公式.研究表明:随着钢板厚度、混凝土厚度、混凝土强度等级的增加,组合剪力墙的抗剪性能均有较显著的提高;组合剪力墙跨高比的变化对其弹性抗侧刚度影响较大,而对其抗剪极限承载力的影响并不明显.通过将公式计算结果与有限元计算结果进行对比分析,发现提出的简化计算公式较合理,能较好地反映双层钢板混凝土组合剪力墙的实际受力状态.该结论可作为双层钢板混凝土组合剪力墙初步设计的参考建议. 相似文献
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朱占虎 《河北能源职业技术学院学报》2004,4(3):64-64,71
通过架棚巷道支护结构分析,架棚巷道破坏原因多是由于巷道的侧压力和底鼓引起,造成棚子相对下沉,使巷道变形、断面变小,采取在巷道两墙打锚杆和棚脚穿钢筋混凝土鞋后巷道围岩对侧压力减小了,支架支承能力增强,提高了巷道的稳定性。 相似文献
9.
Simplified analysis for reflective overpressure on walls of rectangle-section tunnel due to its inner-explosion 总被引：1，自引：0，他引：1
Based on the constructing thought of the displacement model of isoparametric finite element, an extended interpolating algorithm is deduced for calculating the overpressure history of an optional point on the walls of the rectangle-section tunnel under an optional point-explosion in its internal space. According to the working principle, the overpressure histories of all nodes on the walls of a tunnel with the equal width and height of 2 m, induced by a reference-charge explosion at each node in this tunnel's cross section, are computed using the LS-DYNA software, and then are gathered to establish a reference database, which makes it possible to set optionally the positions of the explosive and the overpressure-observed point. In addition, some variation factors of peak values and durations of overpressure on the walls, reflecting some changes on the charge weight and the sizes of width and height of the section, are included in this algorithm in order to simulate approximately the overpressure responses on the walls under the optional charge weight and cross-section size. Some example analyses indicate the rapidity and validity of this method, and therefore this will bring it a good prospect in engineering application. 相似文献
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INTRODUCTION Reinforced concrete elements with box section are commonly used in horizontal subsystems and in vertical support of bridge structures. The horizontal structural members normally have box section and top flange. The vertical supports of the bridge usually have a box section also. To simplify the deduction of such structural member under combined forces, the box sections without top flange are discussed here. Fig.1 shows the typical section types of reinforced concrete members.… 相似文献
11.
To figure out the distribution of temperature gradient along the girder height of steel-concrete composite box girder, combined with the mechanical characteristics of prestressed concrete composed box girder with corrugated steel webs, the calculation formulas of cross-sectional temperature stress along the span in a simply-supported beam bridge with composite section were derived under the conditions of static equilibrium and deformation compatibility of the beam element. The methods of calculating the maximum temperature stress value were discussed when the connectors are assumed rigid or flexible. Theoretical and numerical results indicate that the method proposed shows better precision for the calculation of temperature self-stress in both the top and the bottom surfaces of the box girder. Moreover, the regularity of temperature stress distribution at different locations along the girder span is that the largest axial force of the top or the bottom plate of the box girder is located in the midspan and spreads decreasingly until zero at both supported ends, and that the greatest longitudinal shear density in steel-concrete interface appears at both supported ends and then reduces gradually to zero in the midspan. 相似文献
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This paper presents a case study on an ultra-deep diaphragm wall with a depth of 110 m constructed in Ningbo City. The in-situ application shows that using Bauer BC40 cutter machine in conjunction with cutter wheels specified for different strata would be qualified for constructing the 110 m diaphragm wall with high efficiency and precision given that the quality of slurry and poured concrete can be guaranteed. The ground settlement can be effectively controlled by using the overlapping construction method. Sliding failure as a whole characterized by pronounced lateral deformation is likely to occur in the upper muddy clay layer due to its high compressibility and sensitivity. In contrast, local collapse of trench walls tends to happen in the sandy silt strata. Furthermore, careful attention should be paid to sandy silt during the entire construction period as the vertical displacement of the sandy silt continues to develop even after concrete pouring 相似文献
13.
Based on the investigation of fiber influence on workability of self-compacting concrete (SCC), tests were carried out on two series of SCC rectangular simply supported beams, which were made of hooked steel fibers reinforced concrete with or without stirrups, subjected to four-point symmetrically placed vertical loads. The major test variables are steel fiber contents and stirrup ratios. The results indicate that the ultimate load significantly increases with the increase of fiber content; the addition of ... 相似文献
14.
Through the experiments of 7 T-section composite beams, steel fiber reinforced self-stressing concrete （SFRSC） as the composite beam in the composite layer was studied under the hogging bending. The tests simulated composite layer tensile strain under the hogging bending of inverted loading composite beams, giving the relationship under the different fatigue stress ratios between fatigue cycles and steel bar’s stress range, crack width, stiffness loss and damage, etc., in composite layer. This article established fatigue life equation, and analyzed SFRSC reinforced mechanism to crack width and stiffness loss. The results show that SFRSC as the composite beam concrete has excellent properties of crack resistance and tensile, can reinforce the fatigue crack width and stiffness loss of composite beams, and improve the durability and in normal use of composite beams in the hogging bending zone. 相似文献
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根据商品混凝土塌落度大,流动性增强,导致杯口基础浇筑困难的现状,分析设计构造要求,提出留置施工缝,杯壁混凝土二次浇筑的方案,计算杯壁竖向配筋及抗剪键面积,补强设计杯壁结合面施工缝. 相似文献
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陈登福 《重庆大学学报(英文版)》2007,6(4):242-248
The mathematical model of high-efficiency continuous billet casting was developed, incorporating the effective spraying water coefficient and the effective specific spraying water flowrate of secondary cooling. To realize uniform cooling in secondary cooling zones, the spraying cooling structure and the arrangement of nozzles were redesigned and optimized, and an additional spraying cooling zone was used. A new secondary cooling model of spraying water was built. It was found that the required spraying water flowrate of a cooling zone was related with the casting speed, the casting temperature, the compositions of liquid steel and the cooling water temperature of secondary cooling. The operation of the reformed caster proved that the spraying cooling structure and the new secondary cooling model were suitable, and the casting speed was greatly enhanced. The highest casting speed was (3.8 to 4.0) m/min for billet with a section of 150×150 mm2. The quality and the output of the billet were improved, and the economical benefit was heightened. 相似文献
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王军 《连云港职业技术学院学报》2014,(2):56-59
结合大模内置GJB复合细石砼轻质内墙板在剪力墙结构内填充墙应用的实例,探讨了GJB（钢筋网架与聚苯乙烯板）复合细石砼轻质内墙板在剪力墙结构体系中的应用及其施工工艺注意要点. 相似文献
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INTRODUCTION There is increased need in recent years for strengthening or rehabilitation of existing reinforced concrete structures adversely affected by overloading, construction material deterioration, seismic loads, structural deformation, etc. An effective method for increasing the shear capacity of reinforced concrete columns is the use of externally bonded carbon fiber reinforced plastic (CFRP) systems (ACI, 2002). FRP systems were first applied to reinforced concrete col-umns i… 相似文献
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金鑫 《扬州职业大学学报》2014,(2):40-43
以某高速公路工程一标段施工为例,采用DXZ40/1300下行式移动模架施工。针对此简支箱梁的结构特性,紧密结合现场实际情况,从方案比选、实施工序、施工控制要点等方面介绍了DXZ40/1300下行式移动模架拼装提升施工技术。 相似文献
20.
采用流延成膜法,以戊二醛为交联剂制备Ti O2/壳聚糖复合膜。用X射线衍射仪,傅立叶红外光谱仪以及扫描电镜对复合膜进行表征,并研究了不同戊二醛含量对壳聚糖膜溶胀率的影响。以甲基橙降解反应为模型,研究Ti O2/壳聚糖复合膜降解染料废水的性能。结果表明：Ti O2与壳聚糖相容性较好,加入Ti O2可提高复合膜的机械强度,戊二醛交联能有效抑制膜的过度溶胀;复合膜对甲基橙的降解效果良好：当复合膜用量为0.30g,初始浓度为5mg/L甲基橙溶液50m L,p H为2.36,紫外光照射80min,降解率可达到85%以上,具有较好的应用前景。 相似文献