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1.
砼框架结构抗震设计中浅基础的设计是众值烈度(多遇烈度)下的弹性基础设计,多遇地震作用均应参与组合,柱根设计内力为众值烈度(多烈度)下处于弹性状态时,最不利组合内力经内力调整设计的延性框架柱根内力,浅基础的设计按弹性基础设计时不需要考虑基础的延性要求,设计计算应遵循地基基础抗震设计原则,满足地基基础抗震设计要求。  相似文献   

2.
为研究某一设有叠合柱的局部错层钢筋混凝土(reinforced concrete,RC)框架结构在近断层和远场地震作用下的破坏概率,自定义钢管混凝土叠合柱塑性铰参数,并与试验对比验证塑性铰参数的有效性。采用SAP2000建立非线性分析模型,选取近断层和远场地震波共22条,分别以地震峰值加速度(peak ground acceleration,PGA)和最大层间位移角作为地震动强度指标和结构性能指标,基于增量动力分析(incremental dynamic analysis,IDA)结果和点估计函数对错层框架结构进行易损性分析。结果表明:对于远场地震动,结构满足“三水准”抗震设防要求,在罕遇地震下超越防止倒塌极限状态的概率仅为0.24%;结构在近断层多遇地震下仍能满足“小震不坏”的设计要求,设防地震下结构超越修复后使用极限状态的概率为53.63%,发生中等破坏的概率较大,罕遇地震下结构达到倒塌极限状态的概率为5.37%,较远场地震作用破坏更为严重。研究结果可为错层框架结构的设计和地震风险评估提供参考。  相似文献   

3.
论砼框架结构抗震设计   总被引:1,自引:1,他引:0  
在砼框架结构抗震设计中,应充分考虑地震的破坏作用,合理设定抗震目标,满足设计的基本要求,采用科学的设计方法,建立有效的抗震机制。  相似文献   

4.
砼框架结构延性的探讨   总被引:1,自引:0,他引:1  
本文对砼框架结构延性的概念与重要性进行了总结。分析了影响砼框架结构延性的因素,总结了改善砼框架结构延性的措施,有利于结构设计人员加深对砼框架结构延性的理解。  相似文献   

5.
为了避免混凝土的脆性断裂破坏,在钢/混凝土连接区域中用高延性水泥基材料(ECC)代替了普通混凝土. 采用剪力键/ECC 的抗剪试验、二维锚固螺栓/ECC 拔出试验和有限元模拟研究了 ECC 材料的延性对于连接区域破坏模式、结构性能的影响. 实验结果表明: 通过微观力学原理设计的 ECC 具有 300 倍于普通混凝土的拉伸延性,从而使钢/混凝土连接区中混凝土断裂破坏模式由脆性转变为延性. 混凝土材料的高延性使结构承载能力和变形性能获得改善,这也同时为有限元模拟结果所验证. 通过改变混凝土材料延性而提高结构性能的理念也可在其他类似的钢/混凝土组合结构中得到应用.  相似文献   

6.
浅谈框架结构的延性设计   总被引:1,自引:0,他引:1  
针对实际工程中框架结构房屋抗震设计中的延性设计问题,并结合新的《建筑抗震设计规范》GB50011—2001,分析了延性设计思想及实现方法。  相似文献   

7.
结合"5.12"汶川大地震的震害分析,分析探讨了钢筋混凝土框架结构所出现的"强梁弱柱"破坏。利用对国内外研究成果的分析和总结,寻求影响"强梁弱柱"破坏的主要因素,以便确定合理的柱梁的抗弯承载力来满足"强柱弱梁"的设计要求,并指出了今后如何满足"强柱弱梁"的研究方向,同时给出了影响"强柱弱梁"的三个关键因素,而对于这些因素如何具体应用到框架结构中则有待进一步探讨。  相似文献   

8.
运用有限元分析软件ANSYS对钢筋混凝土多层框架结构进行分析,并与国内通用结构分析软件PKPM分析结果和手算结果进行比较 结果表明,采用ANSYS对钢筋混凝土多层框架结构在竖向荷载作用下的分析满足设计要求  相似文献   

9.
某六层学生公寓的结构设计,采用框架结构、后浇带、人工挖孔墩和独立基础等技术,解决了设计中遇到的问题,从而满足了建筑功能的要求,并且该结构体系受力可靠,经济可行。  相似文献   

10.
地震作用是一种对结构的能量输入。当地震作用引起的构件截面内力超过结构相应的强度指标使结构开裂或钢筋屈服时,这对延性结构来说并不意味着结构破坏,它还能继续吸收和消耗地震能量,因此,延性结构具有较好的抗震性能。但是钢筋混凝土构件的剪切破坏是接近脆性性质的,剪切破坏先于延性结构的破坏,就不能使整个结构的延性性质得到充分发挥,因此要特别防止剪切破坏。  相似文献   

11.
外包钢混凝土构件是一种新型的结构体系。通过实验,对外包钢混凝土构件的受剪破坏过程和抗剪机理进行了分析研究,并与现行混凝土结构设计规范进行了比较,证明了外包钢混凝土具有抗剪强度高、延性好等特点。此外,还对外包钢混凝土杆件的剪切计算公式进行了简化处理,得到了外包钢混凝土的简化计算公式。  相似文献   

12.
Brittle cracks were observed in the welded beam-to-column connections of steel frames during an earthquake. The crack propagation and accumulated damage to the connections can lead to fractures at much lower ductility ratios. Understanding the connections’ damage behavior during an earthquake is crucial for the design of steel moment frames in seismic areas. Nine full scale beam-to-column connections were tested under constant amplitude and variable amplitude cyclic loading. The effects of loading amplitude, loading history, and peak load on the connection damage were analyzed. The damage characters were studied and three damage evolution models were calibrated and validated based on test results. The damage mechanism was investigated and an effective plastic strain index was developed to evaluate connection damage based on a ductile fracture mechanism. A fatigue fracture mechanics-based model, for evaluating the damage process of beam-to-column connections under cyclic loading, was proposed.  相似文献   

13.
To investigate the seismic behavior of connections composed of steel reinforced ultra high strength concrete (SRUHSC) column and reinforced concrete (RC) beam, six interior strong-column-weak-beam connection specimens were tested subjected to reversal cyclic load. Effects of applied axial load ratio and volumetric stirrup ratio on ductility, energy dissipation capacity, strength degradation and rigidity degradation were discussed. It was found that all connection specimens failed in bending in a ductile manner with a beam plastic hinge. The ductility and energy dissipation capacity increased with the decrease of applied axial load ratio or increase of volumetric stirrup ratio. The displacement ductility coefficient and equivalent damping coefficient lay between those of steel reinforced ordinary concrete connection and those of reinforced concrete connection. The applied axial load ratio and volumetric stirrup ratio had less influence on the strength degradation and more influence on the stiffness degradation. The stiffness degraded sharply with the decrease of volumetric stirrup ratio or increase of applied axial load ratio. The experimental results indicate that SRUHSC column and RC beam connection exhibited better seismic performance and can provide reference for engineering application.  相似文献   

14.
对底部框剪砌体房屋地震作用产生裂缝的原因进行分析,提出了在检测过程中应综合考虑此类结构的刚度、强度和延性的方法,对房屋检测有相当的参考价值·  相似文献   

15.
在ANSYS(大型通用有限元分析软件)的帮助下,对跨高比为3的连梁进行了有限元模拟。目前,工程中对于跨高比在2.5-3.5之间的情况,还是依靠经验来完成。这就为连梁在实际工程中的应用提供理论依据,同时也作为后续同类研究的参考。  相似文献   

16.
The main thrust of this research was to determine the effectiveness of polyvinyl alcohol (PVA) powder in enhancing the durability of short GFRC materials. Accelerated aging of the materials was achieved through low-pressure steam curing in a moist chamber. The strength and ductility of GFRC were measured by the direct tension test, which showed that incorporation of PVA powder into GFRC could improve its mechanical behaviour and turn it from brittle to ductile. To investigate the mechanism of the tensile strength enhancement, the fiber-matrix interface was examined by polarizing optical microscopy and scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDAX). It was found that PVA powder tended to migrate to the fiber-matrix interfacial zone and thus prevented the accumulation of calcium hydroxide in this area. PVA film around the fiber resulted in a more ductile interfacial microstructure and better bonding between fiber and matrix, which should be responsible for enhancing the tensile property and preventing the aging of GFRC. Furthermore, PVA powder reduced the microhardness and brittleness at the interface.  相似文献   

17.
学生评价课堂教学质量是提高课堂教学质量的有效方法之一.文章提出了基于COM 和ASP技术的学生评价教学质量系统的实现框架,介绍了系统的功能需求、逻辑结构设计和涉及的部分关键技术.  相似文献   

18.
中餐主题宴会设计分析   总被引:1,自引:0,他引:1  
主题宴会设计是餐饮业的一项重要工作任务,也是餐饮业吸引顾客增加利润空间的重要渠道。但是实际上主题宴会设计仍存在一些误区,在一定程度上偏离了主题宴会设计的宗旨,影响了主题宴会产品的质量。鉴于以上情况,本文从中餐主题宴会设计的主题、台面、菜单、服务员要求等方面对中餐主题宴会设计提出了一些合理建议,并提出了设计过程中所应该注意的问题,提高主题宴会设计的效能,希望能对餐饮业和教育界的中餐主题宴会设计项目有一定的借鉴意义。  相似文献   

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