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Influence of geotextile arrangement on seismic performance of mid-rise buildings subjected to MCE shaking

机译：土工织物布置对中型建筑物受MCE振动的抗震性能的影响

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摘要

Geotextile layers make it possible to construct mid-rise buildings sitting on shallow foundations in unfavourable soil conditions; this study investigates how the arrangement of geotextiles affects the seismic performance of mid-rise buildings under Maximum Considered Earthquake (MCE) shaking. The geotextile arrangement considered here includes the stiffness (5000 kN/m - 12000 kN/m), the length with respect to width of the foundation (8) (1B - 4B), the number of geotextile layers (1 - 7 layers), and their spacing (250 mm - 1000 mm). FLAC3D is used for the numerical simulation and to carry out nonlinear dynamic analysis in the time domain, and an inelastic constitutive model is used to simulate the behaviour of the structure and the geotextile layers under seismic loads. Variations in the shear modulus of soil and the corresponding damping ratio with cyclic shear strain are considered using a hysteretic damping algorithm to model the reasonable dissipation of energy in the soil. The interface between the foundation and ground surface, including the material and geometrical nonlinearities, are used to capture any possible slide and uplift in the foundations. The results are presented with regard to the geotextile arrangement considered, and include the tensile force mobilised in the geotextile layers, the response spectra at the bedrock and ground surface, the shear force developed in the structure, the maximum rocking angle of the foundation, permanent foundation settlement, maximum lateral displacement and the maximum and residual inter-storey drifts. The results show that the geotextile layers close to the edges of the foundation sustained most of the stress induced by foundation rocking, and the geotextile arrangement has a significant influence on the seismic response of mid-rise buildings. Thus, to satisfy the seismic performance of buildings and to optimise the design of foundations reinforced with geotextiles, the stiffness, length, number and spacing of the geotextile layers should be designed with great care.
机译：土工织物层使得在不利的土壤条件下建造位于浅基础上的中层建筑成为可能。这项研究调查了土工布的布置如何影响最大考虑地震（MCE）震动下的中层建筑的抗震性能。这里考虑的土工布布置包括刚度（5000 kN / m-12000 kN / m），相对于基础宽度的长度（8）（1B-4B），土工布层数（1-7层），及其间距（250毫米-1000毫米）。 FLAC3D用于数值模拟并在时域内进行非线性动力分析，而非弹性本构模型用于模拟结构和土工织物层在地震荷载作用下的行为。使用滞回阻尼算法对土壤中能量的合理耗散进行建模，考虑了土的剪切模量的变化以及相应的阻尼比与循环剪切应变的关系。基础与地面之间的界面（包括材料和几何非线性）用于捕获基础中任何可能的滑动和隆起。给出了有关考虑的土工布布置的结果，包括土工布层中动员的拉力，基岩和地面的响应谱，结构中产生的剪力，基础的最大摇摆角，永久性基础沉降，最大横向位移以及最大和剩余的层间漂移。结果表明，靠近基础边缘的土工织物层承受了基础摇摆引起的大部分应力，并且土工织物的排列方式对中层建筑的地震反应具有重大影响。因此，为了满足建筑物的抗震性能并优化用土工布加固的地基的设计，应格外小心地设计土工布层的刚度，长度，数量和间距。

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