摘要
采用有限元分析软件ANSYS/LS-DYNA,分析了基于MAT96本构模型的钢筋混凝土结构爆破拆除过程。混凝土实体单元的单轴压缩模拟试验表明,材料的峰值抗拉强度为2.4 MPa,抗压强度为30.0 MPa,无围压压缩强度约为拉伸强度的12倍;在三轴压缩模拟试验中,随着围压升高,混凝土的抗压强度显著增加、变形显著增大,其模拟结果与真实混凝土试验相近。基于MAT96本构关系的混凝土试件在拉伸模拟试验中呈现的是混凝土的劈裂破坏,而压缩呈现的是对角线破坏,类似于混凝土材料实验室破坏模式,验证了MAT96材料本构关系与混凝土吻合较好。结合整体式建模模拟钢筋混凝土结构爆破拆除倒塌过程,基于计算结果,分析了建筑物在倒塌过程中的前冲、后坐、鼓胀等问题,并对整个倒塌过程做出了定量描述。通过与工程实践相对比,得知模拟结果较符合实际情况,对钢筋混凝土结构建筑物的拆除爆破工程具有指导意义。
The process of blasting demolition of reinforced concrete structures based on MAT96 constitutive model was analyzed by finite element analysis software ANSYS / LS-DYNA. The simulation of uniaxial compression test of concrete solid elements show that the peak tensile strength is 2. 4 MPa,the compressive strength is 30. 0 MPa,and the unconfined compression strength is about 12 times as much as the tensile strength. In the triaxial compression simulation experiments,along with the confining pressure increases,the compressive strength and deformation increase significantly,similar to the real concrete simulation experiment results. With the MAT96 constitutive relation,concrete specimen in tensile simulation experiments presented the cleavage cracking of concrete,the diagonal is presented in the compression damage,similar to the failure mode of concrete material in the lab,which verifies that the MAT96 materials are in good agreement with the concrete constitutive relations. It simulated the collapse of reinforced concrete structures blasting combined integral model based on the calculation results,analyzed the pediment,recoil,bloating and other issues of building collapse,and made a quantitative description of the entire collapse process. Compared with engineering practice,the simulation result is consistentwith the actual situation,which is meaningful to reinforced concrete structure building demolition.
出处
《爆破器材》
CAS
2015年第1期41-45,共5页
Explosive Materials
基金
国家自然科学基金资助项目(51374212)
