钢筋混凝土井塔剪力滞后效应研究  被引量:2

Shear lag effect of reinforced concrete shaft tower

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作  者:张振宇 肖长江 ZHANG Zhen-yu;XIAO Chang-jiang(China Coal Xi'an Design Engineering Co.,Ltd.,Xi'an 710054,China)

机构地区:[1]中煤西安设计工程有限责任公司,陕西西安710054

出  处:《煤炭工程》2021年第7期26-30,共5页Coal Engineering

摘  要:为了研究钢筋混凝土井塔的剪力滞后效应,将框筒结构等效为实体筒,利用能量变分原理推导出结构在侧向力作用下的剪力滞后效应微分方程,并结合边界条件对其进行求解。随后采用Midas Gen有限元软件建立钢筋混凝土井塔模型,分析了梁柱刚度比、角柱刚度、井塔高度以及高宽比等主要因素对井塔剪力滞后效应的影响。结果表明:井塔剪力滞后效应影响最大的部位在底层;在保持井塔结构整体刚度的条件下,适当增加梁的剪切刚度、减小角柱刚度以及控制井塔的高宽比,对改善井塔的剪力滞后效应是有利的。The differential equation of shear lag effect of the structure under the lateral force is derived using energy variation principle,and solved under the boundary conditions,in which the frame-tube structure is equivalent to a solid tube.Then,the reinforced concrete shaft tower model is established in Midas Gen finite element software.With the program,the shear lag effect of shaft tower is analyzed under different beam-to-column stiffness ratios,corner posts stiffness,tower heights and height-width ratio.The results show that the maximum shear lag effect of the shaft tower mainly emerges in the bottom.If remaining the overall stiffness of the shaft tower,increasing the shear stiffness of the beam,reducing the corner posts stiffness and controlling the height width ratio are beneficial to alleviate the shear lag effect of the shaft tower.

关 键 词:钢筋混凝土井塔 剪力滞后效应 梁柱刚度比 角柱刚度 参数化分析 

分 类 号:TD54[矿业工程—矿山机电]

 

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