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钢管再生混凝土框架的恢复力模型研究 被引量:11
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作者 张向冈 陈宗平 +1 位作者 薛建阳 苏益声 《世界地震工程》 CSCD 北大核心 2016年第1期277-283,共7页
为研究低周反复荷载作用下钢管再生混凝土框架的恢复力模型,进行了1榀圆钢管再生混凝土柱-钢筋再生混凝土梁框架和1榀方钢管再生混凝土柱-钢筋再生混凝土梁框架的拟静力试验。对实测试件的破坏机制和滞回曲线,采用位移幅值承载力突降的... 为研究低周反复荷载作用下钢管再生混凝土框架的恢复力模型,进行了1榀圆钢管再生混凝土柱-钢筋再生混凝土梁框架和1榀方钢管再生混凝土柱-钢筋再生混凝土梁框架的拟静力试验。对实测试件的破坏机制和滞回曲线,采用位移幅值承载力突降的特殊处理方法,建立以相对屈服点、相对峰值点和相对破坏点为特征点并结合滞回曲线和刚度退化的三折线荷载-位移恢复力模型。研究结果表明:试件梁端出现弯剪破坏或弯曲破坏,梁先出铰,柱后出铰;试件的滞回曲线基本对称,呈现出比较饱满的梭形。建立的低周反复荷载作用下钢管再生混凝土框架的恢复力模型可以用于该类新型组合结构的弹塑性地震反应分析。 展开更多
关键词 钢管再生混凝土柱-钢筋再生混凝土梁框架 恢复力模型 拟静力试验 位移幅值承载力突降
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方钢管再生混凝土柱恢复力模型试验与分析 被引量:4
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作者 张向冈 陈宗平 +1 位作者 薛建阳 苏益声 《防灾减灾工程学报》 CSCD 北大核心 2016年第5期744-750,共7页
为研究低周反复荷载作用下方钢管再生混凝土柱的恢复力模型,以再生粗骨料取代率和轴压比为变化参数,设计并制作了6个试件,进行拟静力试验。观察试件的破坏形态,实测试件的滞回曲线,综合采用定点指向、位移幅值承载力突降、模型软化点等... 为研究低周反复荷载作用下方钢管再生混凝土柱的恢复力模型,以再生粗骨料取代率和轴压比为变化参数,设计并制作了6个试件,进行拟静力试验。观察试件的破坏形态,实测试件的滞回曲线,综合采用定点指向、位移幅值承载力突降、模型软化点等特殊处理方法,建立以相对屈服点、相对峰值点和相对破坏点为特征点并结合滞回曲线和卸载刚度的三折线荷载—位移恢复力模型。结果表明:试件破坏形态与普通钢管混凝土柱相似,方钢管底部鼓曲破坏,再生混凝土底部被压碎。试件的滞回曲线比较饱满,且稳定性良好。建立的低周反复荷载作用下方钢管再生混凝土构件的三折线恢复力模型与实测滞回曲线吻合较好,建议用于该类新型组合结构的弹塑性地震反应分析。 展开更多
关键词 方钢管再生混凝土柱 恢复力模型 拟静力试验 定点指向 位移幅值承载力突降 模型软化点
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浅谈摩擦摆支座的应用
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作者 张弓 王智 郝砚琪 《四川建材》 2020年第7期130-131,共2页
为了消除桥梁结构在正常使用时的变形及地震荷载作用下的变形对结构的影响,应用摩擦摆抗震球形支座,解决承载、变形、抗震等问题。3×36 m连续钢箱梁,横向跨度(59~64) m,5 000余t钢结构由8根钢筋混凝土墩柱支撑,墩柱上安装三种类型... 为了消除桥梁结构在正常使用时的变形及地震荷载作用下的变形对结构的影响,应用摩擦摆抗震球形支座,解决承载、变形、抗震等问题。3×36 m连续钢箱梁,横向跨度(59~64) m,5 000余t钢结构由8根钢筋混凝土墩柱支撑,墩柱上安装三种类型的摩擦摆抗震球型支座,钢箱梁桥体已投入使用。 展开更多
关键词 摩擦摆球形抗震支座 承载位移 支座观测
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Determination of ultimate bearing capacity of uplift piles using intact and non-intact load−displacement curve 被引量:5
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作者 WANG Qin-ke MAJian-lin +2 位作者 JI Yu-kun ZHANG Jian CHEN Wen-long 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第2期470-485,共16页
Based on the field destructive test of six rock-socketed piles with shallow overburden,three prediction models are used to quantitatively analyze and predict the intact load−displacement curve.The predicted values of ... Based on the field destructive test of six rock-socketed piles with shallow overburden,three prediction models are used to quantitatively analyze and predict the intact load−displacement curve.The predicted values of ultimate uplift capacity were further determined by four methods(displacement controlling method(DCM),reduction coefficient method(RCM),maximum curvature method(MCM),and critical stiffness method(CSM))and compared with the measured value.Through the analysis of the relationship between the change rate of pullout stiffness and displacement,a method used to determine the ultimate uplift capacity via non-intact load−displacement curve was proposed.The results show that the predicted value determined by DCM is more conservative,while the predicted value determined by MCM is larger than the measured value.This suggests that RCM and CSM in engineering applications can be preferentially applied.Moreover,the development law of the change rate of pullout stiffness with displacement agrees well with the attenuation form of power function.The theoretical predicted results of ultimate uplift capacity based on the change rate of pullout stiffness will not be affected by the integrity of the curve.The method is simple and applicable for the piles that are not loaded to failure state,and thus provides new insights into ultimate uplift capacity determination of test piles. 展开更多
关键词 load−displacement curve prediction model determination method of bearing capacity change rate of pullout stiffness
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某客车动力总成悬置系统振动解耦优化设计 被引量:3
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作者 杜建国 《新技术新工艺》 2014年第2期40-41,共2页
以当前正在开发的一款新型客车的悬置系统为例,详细描述了解耦优化设计方法在动力总成悬置系统开发过程中的应用。在悬置系统动力学仿真分析的基础上,进行了悬置支架解耦优化设计,提高了系统解耦率。对各悬置点承载及位移进行分析,为悬... 以当前正在开发的一款新型客车的悬置系统为例,详细描述了解耦优化设计方法在动力总成悬置系统开发过程中的应用。在悬置系统动力学仿真分析的基础上,进行了悬置支架解耦优化设计,提高了系统解耦率。对各悬置点承载及位移进行分析,为悬置元件非线性刚度设计提供了参考依据。 展开更多
关键词 悬置系统 解耦优化 承载位移分析
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基于脆值理论的家用空调器挂机包装防护研究 被引量:6
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作者 段良 赵希枫 +1 位作者 赵可可 王志刚 《上海包装》 2017年第5期33-37,共5页
针对空调器挂机包装跌落出现的问题,本文研究了空调挂机包装跌落的脆值及其缓冲包装。首先,以传统脆值理论及破损边界曲线作为空调器挂机包装设计的理论依据,基于现有空调器包装缓冲方案设计,引入"产品包装位移承载"的概念,... 针对空调器挂机包装跌落出现的问题,本文研究了空调挂机包装跌落的脆值及其缓冲包装。首先,以传统脆值理论及破损边界曲线作为空调器挂机包装设计的理论依据,基于现有空调器包装缓冲方案设计,引入"产品包装位移承载"的概念,实现对挂机的缓冲包装方案的理论冲击G值的计算;同时对相应包装方案进行跌落试验测试,测得实际跌落冲击G值;最终,通过对比理论计算和试验测试的G值结果,对理论计算进行适当的复核,得到以"产品包装位移承载"为基础的空调器挂机包装设计的理论依据。进而可实现对现有空调器挂机跌落冲击的G值进行预估,缩短了挂机包装设计周期,降低了空调器包装开发成本。同时该方法也可以为空调器的结构和包装设计优化提供一种新的理论参考。 展开更多
关键词 空调器挂机 空调包装 脆值理论 G值 位移承载
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Finite element analysis of effect of soil displacement on bearing capacity of single friction pile 被引量:3
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作者 王丽 郑刚 欧若楠 《Journal of Central South University》 SCIE EI CAS 2014年第5期2051-2058,共8页
Effect of soil displacement on friction single pile in the cases of tunneling,surcharge load and uniform soil movement was discussed in details with finite element method.Lateral displacement of the pile caused by soi... Effect of soil displacement on friction single pile in the cases of tunneling,surcharge load and uniform soil movement was discussed in details with finite element method.Lateral displacement of the pile caused by soil displacement reached about 90% of the total displacement,which means that P-Δ effect of axial load can be neglected.The maximum moment of pile decreased from 159 kN·m to 133 kN·m in the case of surcharge load when the axial load increased from 0 to the ultimate load.When deformation of pile caused by soil displacement is large,axial load applied on pile-head plays the role of reducing the maximum bending moment in concrete pile to some extent.When pile is on one side of the tunnel,soil displacements around the pile are all alike,which means that the soil pressures around the pile do not decrease during tunneling.Therefore,Q-s curve of the pile affected by tunneling is very close to that of pile in static loading test.Bearing capacities of piles influenced by surcharge load and uniform soil movement are 2480 kN and 2630 kN,respectively,which are a little greater than that of the pile in static loading test(2400 kN).Soil pressures along pile increase due to surcharge load and uniform soil movement,and so do the shaft resistances along pile,as a result,when rebars in concrete piles are enough,bearing capacity of pile affected by soil displacement increases compared with that of pile in static loading test. 展开更多
关键词 TUNNELING surcharge load uniform soil movement friction pile bearing capacity
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联合拉杆基础与群桩基础在大跨度拱形结构基础中的应用
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作者 陈志海 《广东土木与建筑》 2017年第6期38-40,共3页
随着我国建筑行业持续发展,大跨度空间形效结构既能满足建筑外形及空间要求,又能让结构布置及传力路径与建筑外形协调一致,实现了建筑与结构的高度融合。对某大跨度拱形钢桁架屋盖底部存在的较大水平推力,采用联合水平拉杆与群桩基础共... 随着我国建筑行业持续发展,大跨度空间形效结构既能满足建筑外形及空间要求,又能让结构布置及传力路径与建筑外形协调一致,实现了建筑与结构的高度融合。对某大跨度拱形钢桁架屋盖底部存在的较大水平推力,采用联合水平拉杆与群桩基础共同抵抗的方式进行处理,提出拉杆与群桩基础的联合水平等效线性总刚度的概念,计算基础的水平位移和拉杆与群桩各自承担的水平作用力,验证其可行性。 展开更多
关键词 大跨度拱形结构基础 联合水平等效线性总刚度 群桩水平承载力与位移 Midas GEN
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Axial compression physical testing of traditional and bird beak SHS T-joints
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作者 陈誉 王江 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第6期2328-2338,共11页
The static tests of nine traditional and bird beak square hollow structure(SHS) T-joints with different β values and connection types under axial compression at brace end were carried out. Experimental test schemes, ... The static tests of nine traditional and bird beak square hollow structure(SHS) T-joints with different β values and connection types under axial compression at brace end were carried out. Experimental test schemes, failure modes of specimens, jack load-vertical displacement curves, jack load-deformation of chord and strain intensity distribution curves of joints were presented. The effects of β and connection types on axial compression property of joints were studied. The results show that the ultimate axial compression capacity of common bird beak SHS T-joints and diamond bird beak SHS T-joints is larger than that of traditional SHS T-joint specimens with big values of β. The ultimate axial compression capacity of diamond bird beak SHS T-joints is larger than that of common bird beak SHS T-joints. As β increases, the increase of the ultimate axial compression capacity of diamond bird beak SHS T-joints over that of common bird beak joints grows. The ultimate axial compression capacity and the initial axial stiffness of all kinds of joints increase as β increases, and the initial axial stiffness of the diamond bird beak SHS T-joints is the largest. The ductilities of common bird beak and diamond bird beak SHS T-joints increase as β increases, but the ductility of the traditional SHS T-joints decreases as β increases. 展开更多
关键词 bird beak SHS T-joints axial compression property physical testing ultimate axial compression capacity initial axial compression stiffness strain intensity distribution DUCTILITY
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Movement laws and mechanical characteristics of top coal in blasting face
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作者 SUN Guang-zhong JIANG Zhi-gang 《Journal of Coal Science & Engineering(China)》 2010年第4期352-355,共4页
Measuring the top coal movement and abutment pressure about Teaching ThirdMine that belonged to the National Energy Investment and Development.It shows that thetop coal's strong compression occurs 6 m in front of ... Measuring the top coal movement and abutment pressure about Teaching ThirdMine that belonged to the National Energy Investment and Development.It shows that thetop coal's strong compression occurs 6 m in front of the face, the top coal is in front of sideabutment pressure concentration increase area at this time, and the top coal horizontaldisplacement increase rapidly.Also analyzed the top coal mechanical properties, and thetop coal under abutment pressure turned into block state.Finally, analyzed the top coalfailure mechanism and the structure of the mechanical model, and also made a theoreticalanalysis of the top coal's ultimate bearing capacity. 展开更多
关键词 top coal caving abutment pressure mechanical model ultimate bearing capacity
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基于ANSYS分析CFST拱肋极限承载状态的计算模型对比研究
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作者 朱慈祥 向中富 +2 位作者 张学富 孙吉飚 卞明智 《工业建筑》 CSCD 北大核心 2008年第z1期566-570,451,共6页
结合已有的CFST(concrete-filled steel tuber)本构模型,基于ANSYS分析,对已做试验的两个CFST(单圆管)单肋拱空间极限承载力进行了双重非线性有限元分析探讨。对比研究了六种建模方法下模型拱的极限承载状态,较好地得出了模型拱的极限... 结合已有的CFST(concrete-filled steel tuber)本构模型,基于ANSYS分析,对已做试验的两个CFST(单圆管)单肋拱空间极限承载力进行了双重非线性有限元分析探讨。对比研究了六种建模方法下模型拱的极限承载状态,较好地得出了模型拱的极限承载力和极限承载位移。评价了各种建模方法的适应性,提出了ANSYS分析下精确模拟CFST拱极限承载力的基本原理、基本方法和建模方法选取的建议。计算结果与试验结果符合较好,验证了计算模型的合理性。研究成果可供计算CFST拱时参考。 展开更多
关键词 CFST拱 极限承载 极限承载位移 ANSYS 建模方法 本构关系 双重非线性
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