ABSTRACT

Lightweight masonry blocks (LMBs) are more environmentally favorable than solid clay bricks, and have gradually become the main material for the infill walls of modern buildings. It is of great importance for proposing a suitable hysterical model of LMBs infill walls to accurately predict the seismic responses of modern buildings. However, cyclic loading tests of LMB infill walls demonstrate that the existing formulas of equivalent strut models significantly overestimate the stiffness and underestimate the peak strength. To this end, the force-displacement curves of 24 cyclic loading tests of LMB infill walls sourced from existing literature are statistically analyzed. The modification coefficients of stiffness and peak strength are put forward, and other parameter values such as yield strength coefficient, unloading stiffness coefficient and pinching effect coefficient are also recommended. Then a full-scale cyclic loading test of an LMB infill wall is designed and conducted to verify the accuracy of the modified model. In addition, the applicability of the modified model is also verified by two infill wall tests from existing literature. The results indicate the modified model can accurately simulate the global hysteretic response of LMB infill walls, and the simulation accuracy of the peak strength is increased to more than 90%. This model provides a useful tool for the accurate evaluation of the seismic performance of modern buildings infilled with LMBs.

摘要

轻质砌块（LMBs）比实心粘土砖更环保，逐渐成为现代建筑填充墙的主要材料。提出合适的LMBs填充墙歇斯底里模型对准确预测现代建筑的地震反应具有重要意义。然而，LMB填充墙的循环加载试验表明，现有的等效支柱模型公式显着高估了刚度，低估了峰值强度。为此，对来自现有文献的 LMB 填充墙的 24 次循环加载试验的力-位移曲线进行了统计分析。提出了刚度和峰值强度的修正系数，以及屈服强度系数等其他参数值，还推荐卸载刚度系数和夹紧效应系数。然后设计并进行了LMB填充墙的全尺寸循环加载试验，以验证修改模型的准确性。此外，修改后的模型的适用性也通过现有文献中的两次填充墙试验得到验证。结果表明，修正后的模型可以准确模拟LMB填充墙的整体滞后响应，峰值强度的模拟精度提高到90%以上。该模型为准确评估填充 LMB 的现代建筑的抗震性能提供了有用的工具。修改后的模型的适用性也通过现有文献中的两个填充墙试验得到验证。结果表明，修正后的模型可以准确模拟LMB填充墙的整体滞后响应，峰值强度的模拟精度提高到90%以上。该模型为准确评估填充 LMB 的现代建筑的抗震性能提供了有用的工具。修改后的模型的适用性也通过现有文献中的两个填充墙试验得到验证。结果表明，修正后的模型可以准确模拟LMB填充墙的整体滞后响应，峰值强度的模拟精度提高到90%以上。该模型为准确评估填充 LMB 的现代建筑的抗震性能提供了有用的工具。