承重型横孔连锁混凝土砌块砌体受压性能试验研究

为研究承重型横孔连锁混凝土砌块砌体的受压性能，设计了9组共54个砌体受压试件。砌体由BC240型、BH240型和BH290型三种块型砌块和三种强度砌筑砂浆制作，厚度分别为240、240、290 mm,高度均为1 030 mm,高厚比分别为4.3、4.3、3.6。对砌体试件进行轴心受压试验，观察其裂缝发展规律和破坏特征，分析影响砌体受压性能的关键因素，得到了砌体的抗压强度。研究表明：承重型横孔连锁混凝土砌块砌体受压产生的横向拉应力和砂浆变形产生的附加横向拉应力导致砌块横肋破坏是砌体脆性破坏的主要原因，除了砂浆强度和砌块强度对砌体抗压强度影响较大外，竖肋占比和砌块构造也会影响砌体抗压强度；相近的砌块抗压强度和砂浆强度下，承重型横孔连锁混凝土砌块砌体的抗压强度低于竖孔砌块砌体的抗压强度；提出的抗压强度计算式可以较为准确地计算承重型横孔连锁混凝土砌块砌体的抗压强度。

Experimental study on compressive performance of load-bearing horizontal-hole interlock concrete blocks masonry

A total of 54 compressive specimens in nine groups were designed to study the compressive properties of load-bearing horizontal-hole interlock concrete block (LBHHIB) masonry. The specimens were made of BC240, BH240 and BH290 blocks and masonry mortar of high, medium and low strength. The thickness of the specimens is 240mm, 240mm and 290mm, respectively, the height is 1030mm, and the ratio of height to thickness is 4.3, 4.3 and 3.6, respectively. The specimen was subjected to axial compression test. The crack regularity and failure characteristics of the specimens were studied, and the key factors affecting the compressive performance of the LBHHIB masonry were analyzed. Research has shown that the main cause of masonry failure is the transverse tensile stress caused by masonry compression and the additional transverse tensile stress caused by mortar deformation. In addition to the mortar strength and block strength, vertical rib ratio and block structure also affect the compressive strength of LBHHIB masonry. With similar block compressive strength and mortar strength, the compressive strength of LBHHIB masonry is lower than that of traditional vertical hole block masonry. The formulas for calculating compressive strength presented in this paper can accurately calculate the compressive strength of LBHHIB masonry.