新型混合装配式混凝土剪力墙抗震性能试验研究及有限元分析

预应力筋面积、预应力筋张拉应力、浆锚钢筋无黏结长度及轴压比是新型混合装配式混凝土剪力墙的重要设计参数。在前期试验基础上，开展考虑不同预应力筋面积的新型混合装配式混凝土剪力墙低周反复荷载试验，并采用Abaqus进行有限元参数分析。试验结果表明：相较现浇对比试件，新型混合装配式剪力墙试件抗裂性能、承载力、刚度均明显提高，位移延性性能及耗能能力接近，在预拉力不变的条件下，预应力筋面积变化对试件性能影响较小；有限元参数分析结果表明，预应力筋张拉应力与轴压比的变化将明显影响新型混合装配式混凝土剪力墙的强度与刚度，且均呈正相关关系，而预应力筋面积、浆锚钢筋无黏结长度影响则不够明显。综合分析认为，对于试验涉及的新型混合装配式混凝土剪力墙，建议预应力筋根数取3根，初始张拉力宜为416.6kN，浆锚钢筋无黏结长度宜为150mm。

Experimental study and FEA on seismic performance of new hybrid precast concrete shear walls

The area of pretressing tendons, prestressing stresses, unbonded lengths and the axial compression ratios are the key design parameters of new hybrid precast concrete shear walls (NHPW). Based on the completed tests, supplementary tests on three NHPW specimens with different areas of prestressing tendons were carried out and corresponding finite element analysis (FEA) was conducted by ABAQUS. Test results show that, compared to the cast-in-situ specimens, NHPW specimens possesses improved anti-cracking ability, capacity strength, stiffness, and similar displacement ductility as well as the energy-dissipating capacity. Under constant prestressing forces, the variation of pretressing tendon area has little impact on the seismic behavior of the NHPW specimens. FEA results show that, compared to the area of pretressing tendons and the unbonded lengths, the prestressing stresses and the axial compression ratios have more obvious effect on NHPW lateral resistance. For the tested NHPW specimens, the number of pretressing tendons, the prestressing force, and the unbonded length of grouted steel bar are suggested as 3416.6kN and 150mm, respectively.