天然气爆炸载荷作用下钢筋混凝土板毁伤试验研究  

Experimental Study on Damage of Reinforced Concrete Slabs under Natural Gas Explosion Load

作　　者：乔博阳 谷恭天 王成[1] 宋诗祥 高扬 QIAO Boyang;GU Gongtian;WANG Cheng;SONG Shixiang;GAO Yang(State Key Laboratory of Explosion Science and Safety Protection,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学爆炸科学与安全防护全国重点实验室,北京100081

出　　处：《兵工学报》2024年第7期2393-2403,共11页Acta Armamentarii

基　　金：国家自然科学基金项目(12221002、12002043);中国博士后科学基金面上项目(2021M700427);北京市自然科学基金项目(L212018)。

摘　　要：为研究天然气爆炸压力积聚作用下钢筋混凝土板的毁伤规律,搭建9.8 m^(3)半地下式气体爆炸加载装置,对两种厚度(80 mm、100 mm)、3种强度(C30、C40、C50)的钢筋混凝土板进行当量甲烷爆炸加载下的毁伤试验研究,获得爆炸空间中准静态压力、钢筋混凝土板面外位移、等效应变等分布特征。研究结果表明:封闭空间中,爆炸压力积聚与板体开裂泄压作用下,爆炸准静态压力出现振荡特征;等效应变与裂纹特征一致,呈对称Y型分布,且等效应变具有明显的双峰和三峰特征;两种厚度的钢混板具有显著不同的破坏模式,80 mm厚度时钢筋结构保持完整,混凝土破裂飞散,发生局部混凝土冲切破坏,100 mm时在固接处发生断裂,混凝土板整体抛出,产生大面积钢筋混凝土复合体冲切破坏。The damage characteristics of reinforced concrete slabs under the natural gas explosion load are studied experimentally.A semi-underground gas explosion loading device with a volume of 9.8 m^(3) is constructed for the experimental research on the damage of reinforced concrete slabs with the thicknesses of 80 mm and 100 mm and the strengths of C30,C40 and C50 subjected to methane explosion loading.The distribution characteristics of quasi-static pressure,out-of-plane displacement of concrete slabs,and equivalent strain in the explosion space were obtained.The results reveal that the quasi-static pressure exhibits oscillatory features under the combined effect of explosion pressure accumulation and crack venting of reinforced concrete slabs in an enclosed space.The distribution of equivalent strain coincides with the crack pattern,displaying a symmetrical Y shape,and the equivalent strain has the distinct bimodal and trimodal characteristics.The two reinforced concrete slabs with different thicknesses exhibit significantly different failure modes:the reinforcement structure of 80mm-thick reinforced concrete slab remains intact,and the concrete cracked and dispersed,with localized concrete shearing failure,whereas the fracture of 100 mm-thick reinforced concrete slab occurred at the fixed joint,and the concrete slab is thrown as a whole,resulting in extensive shearing failure of the reinforced concrete composite.

关 键 词：钢筋混凝土板 爆炸载荷 破坏模式 气体爆炸 压力积聚 

分 类 号：O383.2[理学—流体力学]