方中空夹层钢管再生混凝土组合柱传热性能计算分析

摘要

With calcined diatomite and vitrified micro bubbles (VMB)content as the main changing parame-ters,the properties of the VMB recycled concrete blocks was studied.By using ANSYS finite element analysis to analyze different hollow ratios χ(0,0.35)and concretes (ordinary concrete,VMB recycled concrete)influ-ence on heat-transfer properties of the composite columns,and the article uses theoretical calculation to com-pare average heat-transfer coefficient between the single material wall and recycled concrete (RC)filled double skin square steel tube composite columns that are considered the thermal bridge.The result shows that:when calcined diatomite content is 3%,the compressive strength of the 130% VMB content test block can reach 32.45 MPa,and its heat conductivity is only 0.243 2 W/(m·K);when used as building palisade structure, RC filled double skin square steel tube composite columns impact feebly on energy consumption of the exterior wall,and its average heat-transfer coefficient is lower 20% than square steel tubes filled with ordinary con-crete.%以煅烧硅藻土和玻化微珠掺量为主要变化参数，对玻化微珠再生混凝土试块的性能进行了试验研究．采用有限元软件 ANSYS 分析了不同空心率χ（0、0．35）和混凝土（普通混凝土、玻化微珠再生混凝土）对组合柱传热性能的影响，并通过理论计算对比了单一墙体和考虑热桥后的方中空夹层钢管混凝土组合柱平均传热系数．结果显示：煅烧硅藻土掺量为3％时，玻化微珠掺量为130％的试块抗压强度可达32．45 MPa，导热系数仅为0．2432 W／（m·K）；当采用方中空夹层钢管再生混凝土作为建筑的围护结构时，对外墙能耗影响不大，且组合柱平均传热系数较方钢管普通混凝土低20％．