钢筋混凝土烟囱洞口受力性能参数分析
Parameter analysis of mechanical performance of reinforced concrete chimney openings
张松柯 1董志骞 1王沙燚 2李钢 1刘春刚 2杨眉 2余丁浩 1霍林生1
作者信息
- 1. 大连理工大学 海岸和近海工程国家重点实验室,辽宁大连 116024
- 2. 中国电力工程顾问集团东北电力设计院有限公司,吉林长春 130021
- 折叠
摘要
为探究影响洞口应力集中现象的最主要参数及洞口补强设计方法,首先开展了缩尺模型试验,分析了洞口周围应力状态,通过对比试验结果与数值模拟结果验证了分析方法的准确性;随后建立了 49个不同参数的数值分析模型并开展静力弹塑性分析,分别研究了烟囱筒壁厚度、筒壁直径、开洞尺寸、开洞间距等参数对洞口周围应力状态的影响,确定了影响洞口应力集中现象的最主要参数,给出了开洞限值建议,提出了加密配筋设计方法.结果表明:烟囱开设单个洞口时,开洞横截面圆心角应小于70°,开设多个洞口时,总圆心角应小于140°,洞口间距不宜小于0.5倍洞口横向宽度;圆形洞口钢筋补强区域范围宜取4.5倍壁厚,矩形洞口宜取3.5倍壁厚,增加的补强钢筋宜取1.3倍非补强区配筋率;通过地震作用下动力反应分析验证了提出的洞口补强方法可有效减小洞口周围的应力集中程度,改善洞口所在区段的受力性能.
Abstract
In order to explore the most important parameters that affect the stress concentration phenomenon at the opening and the design method for the reinforcement of the opening,a scaled model test was carried out firstly,and the stress state around the opening was analyzed.By comparing with the numerical simulation results,the accuracy of the analysis method was verified.Subsequently,49 numerical analysis models with different parameters were established and static elastic-plastic analysis was conducted.The effects of chimney wall thickness,wall diameter,opening size,and opening spacing on the stress state around the opening were studied separately.The main parameters that affect the stress concentration phenomenon at the opening were determined,and suggestions for the opening limit value were given.A design method for dense reinforcement were proposed.The results show that when the chimney has only one opening,the center angle of the cross-section of the opening should be less than 70°.When there are multiple openings,the whole central angle of all openings should be less than 140°,and the spacing between the openings should not be less than 0.5 times the lateral width of the opening.The range of reinforcement area for circular openings should be 4.5 times the wall thickness,for rectangular openings should be 3.5 times the wall thickness,and for additional reinforcement bars,1.3 times the reinforcement ratio for non reinforcement areas should be taken.The dynamic response analysis under earthquake action has verified that the proposed reinforcement method for the opening can effectively reduce the degree of stress concentration around the opening and improve the mechanical performance of the section where the opening is located.
关键词
钢筋混凝土烟囱/参数分析/应力集中/缩尺模型Key words
reinforced concrete chimney/parameter analysis/stress concentration/scaled model引用本文复制引用
基金项目
辽宁省"兴辽英才计划"项目(XLYC1902043)
出版年
2024
NETL
NSTL
维普
万方数据