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进行了4组不同含钢量的钢筋-沥青复合隔震层的低周反复荷载试验,研究了钢筋-沥青复合隔震层钢筋竖向和水平力-位移关系,同时研究了钢筋-沥青复合隔震层竖向和水平内力重分布情况。试验结果表明:钢筋-沥青复合隔震层中钢筋和砖墩的受力与水平位移之间是非线性关系。在竖直方向,钢筋-沥青复合隔震层的破坏过程分为前期竖向钢筋受压,中期竖向钢筋受拉、砖墩受压和后期砖墩压坏三个阶段。在水平方向,钢筋-沥青复合隔震层的受力过程也分为前期钢筋受力从零开始缓慢增长,中期钢筋受力快速增长和后期钢筋受力下降三个阶段。基于试验结果,对钢筋-沥青复合隔震层钢筋竖向和水平力-位移曲线进行了分析,同时对钢筋-沥青复合隔震层竖向和水平内力重分布后力-位移曲线进行了分析,结果表明,荷载在钢筋和砖墩之间的重分布对隔震层的力-位移曲线有决定性影响。
Four groups of steel-asphalt composite seismic isolation layers with different content of steel were subjected to low-cycle cyclic loading tests. The relationship between vertical and horizontal force-displacement of rebar reinforced with bitumen composite was studied. Seismic vertical and horizontal distribution of internal forces. The experimental results show that there is a nonlinear relationship between the force and the horizontal displacement of the steel bar and the brick pier in the rebar-asphalt composite isolation layer. In the vertical direction, the failure process of reinforced-asphalt composite seismic isolation layer is divided into three stages: pre-compression of vertical reinforcement, mid-term vertical reinforcement, brick compression and brick block crushing in the late stage. In the horizontal direction, the stress process of the rebar-asphalt composite isolation layer is also divided into three stages: the initial reinforcement of the rebar slowly increases from zero, the rapid growth of the mid-term rebar stress and the downward force of the rebar at the later stage. Based on the test results, the vertical and horizontal force-displacement curves of rebar with bitumen-bitumen composite seismic isolation layer are analyzed, and the force-displacement curves of vertical and horizontal internal force redistribution of the rebar-bitumen composite seismic isolation layer are also analyzed. The results show that the redistribution of load between rebar and brick has a decisive influence on the force-displacement curve of the isolation layer.